In the present work, the nitrogen doped carbon nanotubes (NCNTs) were prepared over various transition metal loaded mesoporous SBA-15 catalysts by the CVD method for supercapacitor application. Mesoporous Siliceous SBA-15 support and transition metals (Cr, Fe, Co, Ni and Cu) loaded SBA-15 (M/SBA-15) catalysts were prepared through hydrothermal and wet impregnation process, respectively. The catalytic performance of all the prepared catalysts were evaluated by synthesizing NCNTs by CVD at 800 °C using triethylamine as the precursor. The NCNTs produced over Ni/SBA-15 have an outstanding specific capacitance of 263 F g−1 at 0.5 A g−1 in 1.0 M H2SO4 aqueous solution according to the electrochemical investigations because of its increased nitrogen content of 3.2 at.%. Furthermore, a two-electrode based symmetric device was construct and tested. The fabricated device showed the specific capacitance of 113 F g−1 at 0.5 A g−1 with high energy density of 10 W h Kg−1 at the power density of 333 W kg−1. The NCNT showed 96 % of capacitance retention even after 1000 cycles. The synergism of high nitrogen content and bamboo-like graphitized structure resulted in excellent specific capacitance, better cycle life and rate performance of the prepared NCNTs as supercapacitor electrode.
在本研究中，采用 CVD 法在各种过渡金属负载介孔 SBA-15 催化剂上制备了掺氮碳纳米管 (NCNT)，用于超级电容器。通过水热法和湿浸渍法分别制备了介孔硅质 SBA-15 载体和负载过渡金属（铬、铁、钴、镍和铜）的 SBA-15 (M/SBA-15) 催化剂。以三乙胺为前驱体，在 800 °C 下通过 CVD 合成 NCNT，对所有制备的催化剂的催化性能进行了评估。根据电化学研究，在 Ni/SBA-15 上制备的 NCNT 在 0.5 A g-1 的 1.0 M H2SO4 水溶液中具有 263 F g-1 的出色比电容，这是因为氮含量增加到 3.2 at.%。此外，还构建并测试了一个基于双电极的对称装置。所制造的装置在 0.5 A g-1 的条件下显示出 113 F g-1 的比电容和 10 W h Kg-1 的高能量密度（功率密度为 333 W kg-1）。即使经过 1000 次循环，NCNT 的电容保持率仍高达 96%。高氮含量和竹节状石墨化结构的协同作用使制备的 NCNTs 作为超级电容器电极具有出色的比电容、更长的循环寿命和更高的速率性能。
{"title":"Effective synthesis of nitrogen doped carbon nanotubes over transition metal loaded mesoporous catalysts for energy storage of supercapacitor applications","authors":"Ragavan Rajamanickam, Boopathi Ganesan, Ikhyun Kim, Imran Hasan, Pandurangan Arumugam, Sivaprakash Paramasivam","doi":"10.1515/zpch-2023-0458","DOIUrl":"https://doi.org/10.1515/zpch-2023-0458","url":null,"abstract":"\u0000 In the present work, the nitrogen doped carbon nanotubes (NCNTs) were prepared over various transition metal loaded mesoporous SBA-15 catalysts by the CVD method for supercapacitor application. Mesoporous Siliceous SBA-15 support and transition metals (Cr, Fe, Co, Ni and Cu) loaded SBA-15 (M/SBA-15) catalysts were prepared through hydrothermal and wet impregnation process, respectively. The catalytic performance of all the prepared catalysts were evaluated by synthesizing NCNTs by CVD at 800 °C using triethylamine as the precursor. The NCNTs produced over Ni/SBA-15 have an outstanding specific capacitance of 263 F g−1 at 0.5 A g−1 in 1.0 M H2SO4 aqueous solution according to the electrochemical investigations because of its increased nitrogen content of 3.2 at.%. Furthermore, a two-electrode based symmetric device was construct and tested. The fabricated device showed the specific capacitance of 113 F g−1 at 0.5 A g−1 with high energy density of 10 W h Kg−1 at the power density of 333 W kg−1. The NCNT showed 96 % of capacitance retention even after 1000 cycles. The synergism of high nitrogen content and bamboo-like graphitized structure resulted in excellent specific capacitance, better cycle life and rate performance of the prepared NCNTs as supercapacitor electrode.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"303 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139835371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Agricultural waste upcycling is crucial in the context of climate change. Utilizing seven agricultural by-products as basal substrates, coconut meal (Cocos nucifera) emerged as the most efficient, supporting the highest extracellular lipase (triacyl glycerol acyl hydrolases) yield i.e., 5.27 ± 1.75a U mL−1. This study explored the production of extracellular lipases through solid-state fermentation by using co-cultures of Aspergillus niger, wild and mutant strains. Optimization experiments revealed that 30 g of coconut meal resulted is optimal for supporting highest lipases activity of 6.16 ± 0.16a U mL−1. Incubation at 30 °C, 1 mL inoculum size, and distilled water as a diluent further enhanced lipolytic activity. The study identified sucrose as the preferred carbon source, with 4 % concentration demonstrating the highest activity at 13.66 ± 0.33a U mL−1. Supplementary sources like 1 % olive oil and nitrogen sources such as ammonium chloride and peptone significantly increased lipases production. Magnesium sulfate (0.25 %) among metal ions exhibited the highest lipolytic potential i.e., 19.98 ± 0.01a U mL−1. The crude lipases displayed optimal activity at pH 5.0 and 30 °C, with positive effects observed for Fe2+, Ca2+, and Mg2+, while Co2+, Na+, and Hg2+ had negative impacts on lipases activity. This research not only contributes to understanding the factors influencing lipase production and activity, but also serves as an agricultural waste upcycling technique.
在气候变化的背景下，农业废弃物的升级再循环至关重要。利用七种农副产品作为基础底物，椰子粉（Cocos nucifera）的效率最高，支持最高的胞外脂肪酶（三酰甘油酰基水解酶）产量，即 5.27 ± 1.75a U mL-1。本研究利用黑曲霉野生菌株和突变菌株的共培养物，探索了通过固态发酵生产胞外脂肪酶的方法。优化实验显示，30 克椰子粉是支持最高脂肪酶活性（6.16 ± 0.16a U mL-1）的最佳原料。在 30 °C、1 mL 接种物和蒸馏水稀释条件下培养，可进一步提高脂肪酶活性。研究发现，蔗糖是首选碳源，4% 浓度的蔗糖活性最高，为 13.66 ± 0.33a U mL-1。1 % 的橄榄油等补充源以及氯化铵和蛋白胨等氮源可显著提高脂肪酶的产量。在金属离子中，硫酸镁（0.25 %）的脂肪分解潜能最高，为 19.98 ± 0.01a U mL-1。粗脂肪酶在 pH 值为 5.0 和温度为 30 ℃ 时显示出最佳活性，观察到 Fe2+、Ca2+ 和 Mg2+ 有正面影响，而 Co2+、Na+ 和 Hg2+ 对脂肪酶活性有负面影响。这项研究不仅有助于了解影响脂肪酶产量和活性的因素，还可作为一种农业废物再循环技术。
{"title":"Agricultural waste upcycling into improved production of triacyl glycerol acyl hydrolases","authors":"Hammad Majeed, T. Iftikhar, Alia Siddique","doi":"10.1515/zpch-2023-0474","DOIUrl":"https://doi.org/10.1515/zpch-2023-0474","url":null,"abstract":"\u0000 Agricultural waste upcycling is crucial in the context of climate change. Utilizing seven agricultural by-products as basal substrates, coconut meal (Cocos nucifera) emerged as the most efficient, supporting the highest extracellular lipase (triacyl glycerol acyl hydrolases) yield i.e., 5.27 ± 1.75a U mL−1. This study explored the production of extracellular lipases through solid-state fermentation by using co-cultures of Aspergillus niger, wild and mutant strains. Optimization experiments revealed that 30 g of coconut meal resulted is optimal for supporting highest lipases activity of 6.16 ± 0.16a U mL−1. Incubation at 30 °C, 1 mL inoculum size, and distilled water as a diluent further enhanced lipolytic activity. The study identified sucrose as the preferred carbon source, with 4 % concentration demonstrating the highest activity at 13.66 ± 0.33a U mL−1. Supplementary sources like 1 % olive oil and nitrogen sources such as ammonium chloride and peptone significantly increased lipases production. Magnesium sulfate (0.25 %) among metal ions exhibited the highest lipolytic potential i.e., 19.98 ± 0.01a U mL−1. The crude lipases displayed optimal activity at pH 5.0 and 30 °C, with positive effects observed for Fe2+, Ca2+, and Mg2+, while Co2+, Na+, and Hg2+ had negative impacts on lipases activity. This research not only contributes to understanding the factors influencing lipase production and activity, but also serves as an agricultural waste upcycling technique.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"66 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139776883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Agricultural waste upcycling is crucial in the context of climate change. Utilizing seven agricultural by-products as basal substrates, coconut meal (Cocos nucifera) emerged as the most efficient, supporting the highest extracellular lipase (triacyl glycerol acyl hydrolases) yield i.e., 5.27 ± 1.75a U mL−1. This study explored the production of extracellular lipases through solid-state fermentation by using co-cultures of Aspergillus niger, wild and mutant strains. Optimization experiments revealed that 30 g of coconut meal resulted is optimal for supporting highest lipases activity of 6.16 ± 0.16a U mL−1. Incubation at 30 °C, 1 mL inoculum size, and distilled water as a diluent further enhanced lipolytic activity. The study identified sucrose as the preferred carbon source, with 4 % concentration demonstrating the highest activity at 13.66 ± 0.33a U mL−1. Supplementary sources like 1 % olive oil and nitrogen sources such as ammonium chloride and peptone significantly increased lipases production. Magnesium sulfate (0.25 %) among metal ions exhibited the highest lipolytic potential i.e., 19.98 ± 0.01a U mL−1. The crude lipases displayed optimal activity at pH 5.0 and 30 °C, with positive effects observed for Fe2+, Ca2+, and Mg2+, while Co2+, Na+, and Hg2+ had negative impacts on lipases activity. This research not only contributes to understanding the factors influencing lipase production and activity, but also serves as an agricultural waste upcycling technique.
在气候变化的背景下，农业废弃物的升级再循环至关重要。利用七种农副产品作为基础底物，椰子粉（Cocos nucifera）的效率最高，支持最高的胞外脂肪酶（三酰甘油酰基水解酶）产量，即 5.27 ± 1.75a U mL-1。本研究利用黑曲霉野生菌株和突变菌株的共培养物，探索了通过固态发酵生产胞外脂肪酶的方法。优化实验显示，30 克椰子粉是支持最高脂肪酶活性（6.16 ± 0.16a U mL-1）的最佳原料。在 30 °C、1 mL 接种物和蒸馏水稀释条件下培养，可进一步提高脂肪酶活性。研究发现，蔗糖是首选碳源，4% 浓度的蔗糖活性最高，为 13.66 ± 0.33a U mL-1。1 % 的橄榄油等补充源以及氯化铵和蛋白胨等氮源可显著提高脂肪酶的产量。在金属离子中，硫酸镁（0.25 %）的脂肪分解潜能最高，为 19.98 ± 0.01a U mL-1。粗脂肪酶在 pH 值为 5.0 和温度为 30 ℃ 时显示出最佳活性，观察到 Fe2+、Ca2+ 和 Mg2+ 有正面影响，而 Co2+、Na+ 和 Hg2+ 对脂肪酶活性有负面影响。这项研究不仅有助于了解影响脂肪酶产量和活性的因素，还可作为一种农业废物再循环技术。
{"title":"Agricultural waste upcycling into improved production of triacyl glycerol acyl hydrolases","authors":"Hammad Majeed, T. Iftikhar, Alia Siddique","doi":"10.1515/zpch-2023-0474","DOIUrl":"https://doi.org/10.1515/zpch-2023-0474","url":null,"abstract":"\u0000 Agricultural waste upcycling is crucial in the context of climate change. Utilizing seven agricultural by-products as basal substrates, coconut meal (Cocos nucifera) emerged as the most efficient, supporting the highest extracellular lipase (triacyl glycerol acyl hydrolases) yield i.e., 5.27 ± 1.75a U mL−1. This study explored the production of extracellular lipases through solid-state fermentation by using co-cultures of Aspergillus niger, wild and mutant strains. Optimization experiments revealed that 30 g of coconut meal resulted is optimal for supporting highest lipases activity of 6.16 ± 0.16a U mL−1. Incubation at 30 °C, 1 mL inoculum size, and distilled water as a diluent further enhanced lipolytic activity. The study identified sucrose as the preferred carbon source, with 4 % concentration demonstrating the highest activity at 13.66 ± 0.33a U mL−1. Supplementary sources like 1 % olive oil and nitrogen sources such as ammonium chloride and peptone significantly increased lipases production. Magnesium sulfate (0.25 %) among metal ions exhibited the highest lipolytic potential i.e., 19.98 ± 0.01a U mL−1. The crude lipases displayed optimal activity at pH 5.0 and 30 °C, with positive effects observed for Fe2+, Ca2+, and Mg2+, while Co2+, Na+, and Hg2+ had negative impacts on lipases activity. This research not only contributes to understanding the factors influencing lipase production and activity, but also serves as an agricultural waste upcycling technique.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"120 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139836705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Farhan Ahadi, A. Javadi, Hoda Jafarizadeh-Malmiri, N. Anarjan, Hamid Mirzaei
Silver nanoparticle (AgNPs) is known as a new generation of antibiotics with high bactericidal activity and resistance toward numerous bacteria strains. In the present study, AgNPs were synthesized using propolis extract and microwave heating technique. Results indicated that, the prepared hydroalcoholic propolis extract had brix, turbidity, total phenol content and antioxidant activity of 5.21° Bx, 1.75 % a.u., 82.52 mg/g (gallic acid) and 93.32 %, respectively. FTIR analysis also indicated that the prepared extract had several main functional groups such as hydroxyl, carboxyl, amide I, amin and esters, which those could act as reducing and stabilizing agents in fabrication of stable AgNPs. Furthermore, GC-MS analysis demonstrated that alpha-terpinene, coumaran, p-methoxycinnamic acid, dimethyl caffeic acid and pinostrobin chalcone were the main bioactive compounds of the prepared propolis extract. Results revealed that AgNPs with small particle size (86 nm) and polydespersity index (0.299), and high zeta potential (−23.34) values could be synthesized using 0.1 mL of the extract in combination to 9 mL silver nitrate (1 mM) under microwave heating for 30 s. TEM analysis demonstrated that spherical fabricated AgNPs had uniform particle size distribution with particle size of less than 100 nm. Finally, synthesized AgNps indicated higher bactericidal activity against Listeria monocytogenes and Escherichia coli, with obtained clear zone diameter of 22 and 19 mm, respectively.
{"title":"Microwave-accelerated heating technique in fabrication of silver nanoparticles using propolis extract: optimization and characterization","authors":"Farhan Ahadi, A. Javadi, Hoda Jafarizadeh-Malmiri, N. Anarjan, Hamid Mirzaei","doi":"10.1515/zpch-2022-0148","DOIUrl":"https://doi.org/10.1515/zpch-2022-0148","url":null,"abstract":"\u0000 Silver nanoparticle (AgNPs) is known as a new generation of antibiotics with high bactericidal activity and resistance toward numerous bacteria strains. In the present study, AgNPs were synthesized using propolis extract and microwave heating technique. Results indicated that, the prepared hydroalcoholic propolis extract had brix, turbidity, total phenol content and antioxidant activity of 5.21° Bx, 1.75 % a.u., 82.52 mg/g (gallic acid) and 93.32 %, respectively. FTIR analysis also indicated that the prepared extract had several main functional groups such as hydroxyl, carboxyl, amide I, amin and esters, which those could act as reducing and stabilizing agents in fabrication of stable AgNPs. Furthermore, GC-MS analysis demonstrated that alpha-terpinene, coumaran, p-methoxycinnamic acid, dimethyl caffeic acid and pinostrobin chalcone were the main bioactive compounds of the prepared propolis extract. Results revealed that AgNPs with small particle size (86 nm) and polydespersity index (0.299), and high zeta potential (−23.34) values could be synthesized using 0.1 mL of the extract in combination to 9 mL silver nitrate (1 mM) under microwave heating for 30 s. TEM analysis demonstrated that spherical fabricated AgNPs had uniform particle size distribution with particle size of less than 100 nm. Finally, synthesized AgNps indicated higher bactericidal activity against Listeria monocytogenes and Escherichia coli, with obtained clear zone diameter of 22 and 19 mm, respectively.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"17 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139777270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The structural, morphological, magnetic, and dielectric properties of lanthanum substituted nickel ferrite (NiLa x Fe2−x O4) nanoparticles have been reported in this article. The amount of lanthanum substitution in NiLa x Fe2−x O4 sample was varied from x = 0.025 to 0.125. The nanocrystalline Ni–La ferrites were synthesized using a solution combustion reaction (SCR) method. The orthorhombic crystal system of space group Pnma (62) is shown as the single-phase in all samples through structural investigation utilizing an X-ray diffraction (XRD) pattern. The observed trend indicates a positive correlation between the concentration of La and the corresponding rise in the predicted crystallite size values, which range from 60.5 nm to 65.2 nm. The nanoscale of the surface morphology has been confirmed by the utilisation of field emission scanning electron microscopy (FESEM). Energy dispersive X-ray (EDAX) mapping provides the compositional evidence for the prepared Ni–La ferrites. In addition, X-ray photoelectron spectroscopy (XPS) determines the ionic state of the individual atoms present in these samples. It reveals that there are no changes in the ionic state of the parent component atoms by substituting La. EDAX and XPS evidence the purity of prepared NiLa x Fe2−x O4 samples without any other impurity elements. By regulating the composition of dopants, this research can substantiate the superparamagnetic characteristics of ferrites. The paramagnetic nature of lanthanum atoms involves in reducing the coercivity value. The dielectric measurement on NiLa x Fe2−x O4 samples reveals that La3+ substitution effectively influence the electro-transport properties.
本文报告了镧置换镍铁氧体（NiLa x Fe2-x O4）纳米粒子的结构、形态、磁性和介电性能。NiLa x Fe2-x O4 样品中镧的取代量在 x = 0.025 至 0.125 之间变化。采用溶液燃烧反应（SCR）法合成了纳米晶 Ni-La 铁氧体。通过利用 X 射线衍射 (XRD) 图样进行结构研究，发现所有样品中的单相都是空间群为 Pnma (62) 的正方晶系。观察到的趋势表明，La 的浓度与预测晶粒尺寸值（从 60.5 纳米到 65.2 纳米）的相应增加之间存在正相关。利用场发射扫描电子显微镜（FESEM）确认了表面形貌的纳米尺度。能量色散 X 射线（EDAX）制图为制备的镍镭铁氧体提供了成分证据。此外，X 射线光电子能谱（XPS）还能确定这些样品中各个原子的离子状态。结果表明，取代 La 后，母原子成分的离子状态没有发生变化。EDAX 和 XPS 证明制备的 NiLa x Fe2-x O4 样品纯度很高，没有任何其他杂质元素。通过调节掺杂剂的组成，这项研究可以证实铁氧体的超顺磁性能。镧原子的顺磁性降低了矫顽力值。对 NiLa x Fe2-x O4 样品进行的介电测量显示，La3+ 的取代有效地影响了电传输特性。
{"title":"Effect of lanthanum (La) substitution on the magnetic and electrical properties of nickel ferrites: an investigation of its doping concentrations","authors":"Anandhi Deenan Venugopal, Selvanandan Selvaraj, Jhelai Sahadevan, Ikhyun Kim, Parameshwari Ramalingam, Sivaprakash Paramasivam","doi":"10.1515/zpch-2023-0485","DOIUrl":"https://doi.org/10.1515/zpch-2023-0485","url":null,"abstract":"\u0000 The structural, morphological, magnetic, and dielectric properties of lanthanum substituted nickel ferrite (NiLa\u0000 x\u0000 Fe2−x\u0000 O4) nanoparticles have been reported in this article. The amount of lanthanum substitution in NiLa\u0000 x\u0000 Fe2−x\u0000 O4 sample was varied from x = 0.025 to 0.125. The nanocrystalline Ni–La ferrites were synthesized using a solution combustion reaction (SCR) method. The orthorhombic crystal system of space group Pnma (62) is shown as the single-phase in all samples through structural investigation utilizing an X-ray diffraction (XRD) pattern. The observed trend indicates a positive correlation between the concentration of La and the corresponding rise in the predicted crystallite size values, which range from 60.5 nm to 65.2 nm. The nanoscale of the surface morphology has been confirmed by the utilisation of field emission scanning electron microscopy (FESEM). Energy dispersive X-ray (EDAX) mapping provides the compositional evidence for the prepared Ni–La ferrites. In addition, X-ray photoelectron spectroscopy (XPS) determines the ionic state of the individual atoms present in these samples. It reveals that there are no changes in the ionic state of the parent component atoms by substituting La. EDAX and XPS evidence the purity of prepared NiLa\u0000 x\u0000 Fe2−x\u0000 O4 samples without any other impurity elements. By regulating the composition of dopants, this research can substantiate the superparamagnetic characteristics of ferrites. The paramagnetic nature of lanthanum atoms involves in reducing the coercivity value. The dielectric measurement on NiLa\u0000 x\u0000 Fe2−x\u0000 O4 samples reveals that La3+ substitution effectively influence the electro-transport properties.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"50 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139777358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Farhan Ahadi, A. Javadi, Hoda Jafarizadeh-Malmiri, N. Anarjan, Hamid Mirzaei
Silver nanoparticle (AgNPs) is known as a new generation of antibiotics with high bactericidal activity and resistance toward numerous bacteria strains. In the present study, AgNPs were synthesized using propolis extract and microwave heating technique. Results indicated that, the prepared hydroalcoholic propolis extract had brix, turbidity, total phenol content and antioxidant activity of 5.21° Bx, 1.75 % a.u., 82.52 mg/g (gallic acid) and 93.32 %, respectively. FTIR analysis also indicated that the prepared extract had several main functional groups such as hydroxyl, carboxyl, amide I, amin and esters, which those could act as reducing and stabilizing agents in fabrication of stable AgNPs. Furthermore, GC-MS analysis demonstrated that alpha-terpinene, coumaran, p-methoxycinnamic acid, dimethyl caffeic acid and pinostrobin chalcone were the main bioactive compounds of the prepared propolis extract. Results revealed that AgNPs with small particle size (86 nm) and polydespersity index (0.299), and high zeta potential (−23.34) values could be synthesized using 0.1 mL of the extract in combination to 9 mL silver nitrate (1 mM) under microwave heating for 30 s. TEM analysis demonstrated that spherical fabricated AgNPs had uniform particle size distribution with particle size of less than 100 nm. Finally, synthesized AgNps indicated higher bactericidal activity against Listeria monocytogenes and Escherichia coli, with obtained clear zone diameter of 22 and 19 mm, respectively.
{"title":"Microwave-accelerated heating technique in fabrication of silver nanoparticles using propolis extract: optimization and characterization","authors":"Farhan Ahadi, A. Javadi, Hoda Jafarizadeh-Malmiri, N. Anarjan, Hamid Mirzaei","doi":"10.1515/zpch-2022-0148","DOIUrl":"https://doi.org/10.1515/zpch-2022-0148","url":null,"abstract":"\u0000 Silver nanoparticle (AgNPs) is known as a new generation of antibiotics with high bactericidal activity and resistance toward numerous bacteria strains. In the present study, AgNPs were synthesized using propolis extract and microwave heating technique. Results indicated that, the prepared hydroalcoholic propolis extract had brix, turbidity, total phenol content and antioxidant activity of 5.21° Bx, 1.75 % a.u., 82.52 mg/g (gallic acid) and 93.32 %, respectively. FTIR analysis also indicated that the prepared extract had several main functional groups such as hydroxyl, carboxyl, amide I, amin and esters, which those could act as reducing and stabilizing agents in fabrication of stable AgNPs. Furthermore, GC-MS analysis demonstrated that alpha-terpinene, coumaran, p-methoxycinnamic acid, dimethyl caffeic acid and pinostrobin chalcone were the main bioactive compounds of the prepared propolis extract. Results revealed that AgNPs with small particle size (86 nm) and polydespersity index (0.299), and high zeta potential (−23.34) values could be synthesized using 0.1 mL of the extract in combination to 9 mL silver nitrate (1 mM) under microwave heating for 30 s. TEM analysis demonstrated that spherical fabricated AgNPs had uniform particle size distribution with particle size of less than 100 nm. Finally, synthesized AgNps indicated higher bactericidal activity against Listeria monocytogenes and Escherichia coli, with obtained clear zone diameter of 22 and 19 mm, respectively.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"58 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139836857","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The structural, morphological, magnetic, and dielectric properties of lanthanum substituted nickel ferrite (NiLa x Fe2−x O4) nanoparticles have been reported in this article. The amount of lanthanum substitution in NiLa x Fe2−x O4 sample was varied from x = 0.025 to 0.125. The nanocrystalline Ni–La ferrites were synthesized using a solution combustion reaction (SCR) method. The orthorhombic crystal system of space group Pnma (62) is shown as the single-phase in all samples through structural investigation utilizing an X-ray diffraction (XRD) pattern. The observed trend indicates a positive correlation between the concentration of La and the corresponding rise in the predicted crystallite size values, which range from 60.5 nm to 65.2 nm. The nanoscale of the surface morphology has been confirmed by the utilisation of field emission scanning electron microscopy (FESEM). Energy dispersive X-ray (EDAX) mapping provides the compositional evidence for the prepared Ni–La ferrites. In addition, X-ray photoelectron spectroscopy (XPS) determines the ionic state of the individual atoms present in these samples. It reveals that there are no changes in the ionic state of the parent component atoms by substituting La. EDAX and XPS evidence the purity of prepared NiLa x Fe2−x O4 samples without any other impurity elements. By regulating the composition of dopants, this research can substantiate the superparamagnetic characteristics of ferrites. The paramagnetic nature of lanthanum atoms involves in reducing the coercivity value. The dielectric measurement on NiLa x Fe2−x O4 samples reveals that La3+ substitution effectively influence the electro-transport properties.
本文报告了镧置换镍铁氧体（NiLa x Fe2-x O4）纳米粒子的结构、形态、磁性和介电性能。NiLa x Fe2-x O4 样品中镧的取代量在 x = 0.025 至 0.125 之间变化。采用溶液燃烧反应（SCR）法合成了纳米晶 Ni-La 铁氧体。通过利用 X 射线衍射 (XRD) 图样进行结构研究，发现所有样品中的单相都是空间群为 Pnma (62) 的正方晶系。观察到的趋势表明，La 的浓度与预测晶粒尺寸值（从 60.5 纳米到 65.2 纳米）的相应增加之间存在正相关。利用场发射扫描电子显微镜（FESEM）确认了表面形貌的纳米尺度。能量色散 X 射线（EDAX）制图为制备的镍镭铁氧体提供了成分证据。此外，X 射线光电子能谱（XPS）还能确定这些样品中各个原子的离子状态。结果表明，取代 La 后，母原子成分的离子状态没有发生变化。EDAX 和 XPS 证明制备的 NiLa x Fe2-x O4 样品纯度很高，没有任何其他杂质元素。通过调节掺杂剂的组成，这项研究可以证实铁氧体的超顺磁性能。镧原子的顺磁性降低了矫顽力值。对 NiLa x Fe2-x O4 样品进行的介电测量显示，La3+ 的取代有效地影响了电传输特性。
{"title":"Effect of lanthanum (La) substitution on the magnetic and electrical properties of nickel ferrites: an investigation of its doping concentrations","authors":"Anandhi Deenan Venugopal, Selvanandan Selvaraj, Jhelai Sahadevan, Ikhyun Kim, Parameshwari Ramalingam, Sivaprakash Paramasivam","doi":"10.1515/zpch-2023-0485","DOIUrl":"https://doi.org/10.1515/zpch-2023-0485","url":null,"abstract":"\u0000 The structural, morphological, magnetic, and dielectric properties of lanthanum substituted nickel ferrite (NiLa\u0000 x\u0000 Fe2−x\u0000 O4) nanoparticles have been reported in this article. The amount of lanthanum substitution in NiLa\u0000 x\u0000 Fe2−x\u0000 O4 sample was varied from x = 0.025 to 0.125. The nanocrystalline Ni–La ferrites were synthesized using a solution combustion reaction (SCR) method. The orthorhombic crystal system of space group Pnma (62) is shown as the single-phase in all samples through structural investigation utilizing an X-ray diffraction (XRD) pattern. The observed trend indicates a positive correlation between the concentration of La and the corresponding rise in the predicted crystallite size values, which range from 60.5 nm to 65.2 nm. The nanoscale of the surface morphology has been confirmed by the utilisation of field emission scanning electron microscopy (FESEM). Energy dispersive X-ray (EDAX) mapping provides the compositional evidence for the prepared Ni–La ferrites. In addition, X-ray photoelectron spectroscopy (XPS) determines the ionic state of the individual atoms present in these samples. It reveals that there are no changes in the ionic state of the parent component atoms by substituting La. EDAX and XPS evidence the purity of prepared NiLa\u0000 x\u0000 Fe2−x\u0000 O4 samples without any other impurity elements. By regulating the composition of dopants, this research can substantiate the superparamagnetic characteristics of ferrites. The paramagnetic nature of lanthanum atoms involves in reducing the coercivity value. The dielectric measurement on NiLa\u0000 x\u0000 Fe2−x\u0000 O4 samples reveals that La3+ substitution effectively influence the electro-transport properties.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"113 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139837236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Climate change is a universal issue and plastic trash is the major cause of global warming. The present study was specifically designed to address the escalating plastic waste problem, the biodegradation of low-density polyethylene (LDPE) bags was investigated over an 8-week period using liquid culture approach. Bacterial strain (Pseudomonas putida) capable of degrading LDPE was isolated from common plastic garbage dumping sites. The strain was identified after sequencing analysis, as P. putida was evaluated for its effectiveness in degrading LDPE. Various analytical techniques, including weight loss, SEM, FTIR and GC-MS were employed to assess the degradation process. Results revealed that bacterial strain achieved 0.0776 % degradation. SEM and FTIR confirmed surface and chemical changes, while GC MS identified degradation by products in comparison to the control (where no bacteria was used).
{"title":"Climate resilience plastic degradation potential of Pseudomonas putida isolated from the soil of plastic waste dumping sites to reduce GHG emissions","authors":"Hammad Majeed, T. Iftikhar, Qamar Abbas","doi":"10.1515/zpch-2023-0316","DOIUrl":"https://doi.org/10.1515/zpch-2023-0316","url":null,"abstract":"\u0000 Climate change is a universal issue and plastic trash is the major cause of global warming. The present study was specifically designed to address the escalating plastic waste problem, the biodegradation of low-density polyethylene (LDPE) bags was investigated over an 8-week period using liquid culture approach. Bacterial strain (Pseudomonas putida) capable of degrading LDPE was isolated from common plastic garbage dumping sites. The strain was identified after sequencing analysis, as P. putida was evaluated for its effectiveness in degrading LDPE. Various analytical techniques, including weight loss, SEM, FTIR and GC-MS were employed to assess the degradation process. Results revealed that bacterial strain achieved 0.0776 % degradation. SEM and FTIR confirmed surface and chemical changes, while GC MS identified degradation by products in comparison to the control (where no bacteria was used).","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"82 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139781441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tayyba Arooj, H. N. Bhatti, N. AlMasoud, Amina Khan, T. Alomar, Munawar Iqbal
In this investigation, composites consisting of polypyrrole (PPy), polyaniline (PAN), and sodium alginate combined with rice husk (RH) biomass were fabricated, utilizing them as adsorbents for naphthalene. The optimization of key process variables, including pH, pesticide concentration, composite dosage, contact time, and temperature were systematically undertaken to enhance the removal efficiency of naphthalene. Notably, the composites exhibited promising efficacy in adsorbing naphthalene, with native rice husk and PPy/RH (at pH 4), PAN/RH (at pH 5), and Na-alginate/RH (at pH 6) displaying the highest removal rates. Optimized conditions for composite dosage, temperature, and contact time were determined as 0.05 g, 30 °C, and 90 min, respectively, ensuring efficient removal of naphthalene. The adsorption capacities for naphthalene were found to be 22.04, 23.15, 23.89 and 21.67 (mg/g) for RH, PAN/RH, PPY/RH and Na-alginate/RH, respectively. The Langmuir isotherm and pseudo-first-order kinetics models aptly described the adsorption process onto the composite material. The surface morphology and functional groups involved in the biocomposite formation were examined through scanning electron microscope (SEM) and Fourier-transform infrared (FTIR) techniques. These analyses confirmed that PPy, PAN, and Na-alginate composites with RH biomass exhibit high effectiveness in naphthalene removal, showcasing their potential application in the remediation of naphthalene from effluents.
{"title":"Rice husk composite with polyaniline, sodium alginate and polypyrrole: naphthalene adsorption kinetics, equilibrium and thermodynamic studies","authors":"Tayyba Arooj, H. N. Bhatti, N. AlMasoud, Amina Khan, T. Alomar, Munawar Iqbal","doi":"10.1515/zpch-2023-0569","DOIUrl":"https://doi.org/10.1515/zpch-2023-0569","url":null,"abstract":"\u0000 In this investigation, composites consisting of polypyrrole (PPy), polyaniline (PAN), and sodium alginate combined with rice husk (RH) biomass were fabricated, utilizing them as adsorbents for naphthalene. The optimization of key process variables, including pH, pesticide concentration, composite dosage, contact time, and temperature were systematically undertaken to enhance the removal efficiency of naphthalene. Notably, the composites exhibited promising efficacy in adsorbing naphthalene, with native rice husk and PPy/RH (at pH 4), PAN/RH (at pH 5), and Na-alginate/RH (at pH 6) displaying the highest removal rates. Optimized conditions for composite dosage, temperature, and contact time were determined as 0.05 g, 30 °C, and 90 min, respectively, ensuring efficient removal of naphthalene. The adsorption capacities for naphthalene were found to be 22.04, 23.15, 23.89 and 21.67 (mg/g) for RH, PAN/RH, PPY/RH and Na-alginate/RH, respectively. The Langmuir isotherm and pseudo-first-order kinetics models aptly described the adsorption process onto the composite material. The surface morphology and functional groups involved in the biocomposite formation were examined through scanning electron microscope (SEM) and Fourier-transform infrared (FTIR) techniques. These analyses confirmed that PPy, PAN, and Na-alginate composites with RH biomass exhibit high effectiveness in naphthalene removal, showcasing their potential application in the remediation of naphthalene from effluents.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"129 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139780924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Parimala Gandhi Karuppannan, Selvakumar Paramasivam, Petchiammal Mariappan, Sivagami Shunmugam, Samuel Jabez Richard Paul
The treatment of industrial waste water using cyanobacteria in photobioreactor for the removal of sulphide, COD and phenol. The microorganisms were collected from the effluent treatment plant of a petroleum refinery and a biofilm was developed in nutrient medium. The reactor was fed with cyanobacteria. After biofilm formation and acclimatization, the same procedure was followed for 16 days in a rectangular tray type photo bioreactor for the treatment of industrial waste water. From continuous mode of operation, it was found that the phototrophic microorganisms can degrade the pollutants present in industrial waste water. The removal efficiency of hardness 75 %, sulphide 95.8 %, COD 98.7 %, phenol 99.9 % and nitrate 83.7 % was studied. The present works shows that it is feasible to use cyanobacteria in a photo bioreactor for the treatment of industrial waste water.
{"title":"Removal of chemicals from effluent using photobioreactor technology to improve environmental and health impacts","authors":"Parimala Gandhi Karuppannan, Selvakumar Paramasivam, Petchiammal Mariappan, Sivagami Shunmugam, Samuel Jabez Richard Paul","doi":"10.1515/zpch-2023-0450","DOIUrl":"https://doi.org/10.1515/zpch-2023-0450","url":null,"abstract":"\u0000 The treatment of industrial waste water using cyanobacteria in photobioreactor for the removal of sulphide, COD and phenol. The microorganisms were collected from the effluent treatment plant of a petroleum refinery and a biofilm was developed in nutrient medium. The reactor was fed with cyanobacteria. After biofilm formation and acclimatization, the same procedure was followed for 16 days in a rectangular tray type photo bioreactor for the treatment of industrial waste water. From continuous mode of operation, it was found that the phototrophic microorganisms can degrade the pollutants present in industrial waste water. The removal efficiency of hardness 75 %, sulphide 95.8 %, COD 98.7 %, phenol 99.9 % and nitrate 83.7 % was studied. The present works shows that it is feasible to use cyanobacteria in a photo bioreactor for the treatment of industrial waste water.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"51 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139840257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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