Catalase is an antioxidant enzyme with great therapeutic potential that scavenges hydrogen peroxide, a reactive oxygen species produced during cellular metabolism. Substances containing 1,2,4-triazole structures are biologically important heterocyclic compounds found in the structure of many pharmaceutical drugs used in drug discovery studies against various types of diseases in the human body. In this study, the effect of phosphate buffer prepared at different pHs and 3-amino-1,2,4-triazole-5-carboxylic acid (ATZc) on catalase enzyme activity in human blood erythrocytes was determined. It was determined that the catalase enzyme was inhibited by ATZc at different pH levels. The weakest inhibition was observed at pH 5.5 (IC50:49.01 µM), whereas the strongest inhibition was observed at pH 7.5 (IC50:23.21 µM).
{"title":"Effect of 3-Amino-1,2,4-Triazole-5-Carboxylic Acid on Human Blood Erythrocyte Catalase","authors":"Kübra Çıkrıkçı, Nahit Gençer","doi":"10.18596/jotcsa.1381362","DOIUrl":"https://doi.org/10.18596/jotcsa.1381362","url":null,"abstract":"Catalase is an antioxidant enzyme with great therapeutic potential that scavenges hydrogen peroxide, a reactive oxygen species produced during cellular metabolism. Substances containing 1,2,4-triazole structures are biologically important heterocyclic compounds found in the structure of many pharmaceutical drugs used in drug discovery studies against various types of diseases in the human body. In this study, the effect of phosphate buffer prepared at different pHs and 3-amino-1,2,4-triazole-5-carboxylic acid (ATZc) on catalase enzyme activity in human blood erythrocytes was determined. It was determined that the catalase enzyme was inhibited by ATZc at different pH levels. The weakest inhibition was observed at pH 5.5 (IC50:49.01 µM), whereas the strongest inhibition was observed at pH 7.5 (IC50:23.21 µM).","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140511983","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}
Riki Subagyo, Elfirza Zai̇n, Siyam Marti̇na, Saepurahman Saepurahman, Y. Kusumawati
Polyol method, as one alternative in ZnO synthetic methods, have been developed and generated a nano-ZnO. However, the produced nano-ZnO is unstable due to its small particle size. To overcome the problems, we added Hibiscus tiliaceus leaves’ extract during the ZnO (EZnO) synthesis to change the water content and hydrolysis ratio of Zn2+/water. The addition of H. tiliaceus extract resulted in a shifting peak at (101) plane compared to ZnO synthesized without extract addition (WZnO). The use of H. tiliaceus extracts leads to the formation of large and non-uniform particles compared to the one prepared without the extract, which is in agreement with the intensity of diffraction pattern. The use of H. tiliaceus extracts shifted the bandgap energy to visible range. The performance of WZnO and EZnO samples was tested for simultaneous photo-oxidation of methylene blue and photo-reduction of Cr(VI) ions under UV-C irradiation. The EZnO is equally active as WZnO for Cr(VI) ion photo-reduction but less active for photo-oxidation of methylene blue. The presence of retained organic material in EZnO is plausibly affected by the adsorption and subsequent photo-oxidation of the bulky MB leading to a lower photo-oxidation performance. However, the activity of EZnO was a little bit lower than that of WZnO, revealing that the synergistic of particle size and band gap energy is a crucial factor in photo-removal process. In addition, the presence of phenolic compounds on the EZnO surface might change the nature properties of WZnO, which influence its performance.
{"title":"The Influence of Hibiscus tiliaceus Leaf Extract as Capping Agent on the Zinc Oxide Properties and its Photo-simultaneous Performance","authors":"Riki Subagyo, Elfirza Zai̇n, Siyam Marti̇na, Saepurahman Saepurahman, Y. Kusumawati","doi":"10.18596/jotcsa.1372145","DOIUrl":"https://doi.org/10.18596/jotcsa.1372145","url":null,"abstract":"Polyol method, as one alternative in ZnO synthetic methods, have been developed and generated a nano-ZnO. However, the produced nano-ZnO is unstable due to its small particle size. To overcome the problems, we added Hibiscus tiliaceus leaves’ extract during the ZnO (EZnO) synthesis to change the water content and hydrolysis ratio of Zn2+/water. The addition of H. tiliaceus extract resulted in a shifting peak at (101) plane compared to ZnO synthesized without extract addition (WZnO). The use of H. tiliaceus extracts leads to the formation of large and non-uniform particles compared to the one prepared without the extract, which is in agreement with the intensity of diffraction pattern. The use of H. tiliaceus extracts shifted the bandgap energy to visible range. The performance of WZnO and EZnO samples was tested for simultaneous photo-oxidation of methylene blue and photo-reduction of Cr(VI) ions under UV-C irradiation. The EZnO is equally active as WZnO for Cr(VI) ion photo-reduction but less active for photo-oxidation of methylene blue. The presence of retained organic material in EZnO is plausibly affected by the adsorption and subsequent photo-oxidation of the bulky MB leading to a lower photo-oxidation performance. However, the activity of EZnO was a little bit lower than that of WZnO, revealing that the synergistic of particle size and band gap energy is a crucial factor in photo-removal process. In addition, the presence of phenolic compounds on the EZnO surface might change the nature properties of WZnO, which influence its performance.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514229","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}
Mining is a major source of toxic heavy metals into the soil when mine wastes are discharged into the nearby farmlands used for the cultivation of food crops. This study investigated the influence of Pb–Zn mining on the quality and ecological risk of arable soils around active mining sites in Adudu, Nasarawa State, Nigeria. Composite soil samples were collected at 0–20 cm depth, pulverized, and analyzed for heavy metal (Al, As, Cr, Cu, Fe, Mn, Pb, and Zn) concentration using X–ray fluorescence technique. Enrichment factor, geo–accumulation index, improved Nemerow index (IIN), contamination factor (CF), degree of contamination (Cd), pollution load index (PLI), and ecological risk assessment (ERA) were used to evaluate the effect of the mining activities on the environment. Results showed elevated levels of Pb, Zn, Cu, Fe, Mn, and Cr in arable soils around the mine and lower levels of these metals in the control soil. IIN, Cd, and PLI showed that the mine and the nearby arable soils were the most deteriorated, and soil quality improved away from the mining vicinity. ERA revealed that the mine and the closest arable soils (sites F1 and F4) have significant to high ecological risk index as a result of the dominant presence of Pb, Zn, and Cu at the sites. Thus, arable soils which are disposal channels for mine wastes are not good for growing food crops. This study clearly shows that Pb–Zn mining activities introduced heavy metals into the arable soils surrounding the mine.
采矿业是土壤中有毒重金属的主要来源，因为采矿废料被排放到附近用于种植粮食作物的农田中。本研究调查了尼日利亚纳萨拉瓦州阿杜杜活跃矿区周围的铅锌矿开采对耕地土壤质量和生态风险的影响。研究人员采集了 0-20 厘米深的复合土壤样本，粉碎后使用 X 射线荧光技术分析了重金属（Al、As、Cr、Cu、Fe、Mn、Pb 和 Zn）的浓度。利用富集因子、地质累积指数、改进的内默罗指数 (IIN)、污染因子 (CF)、污染程度 (Cd)、污染负荷指数 (PLI) 和生态风险评估 (ERA) 来评估采矿活动对环境的影响。结果显示，矿区周围耕地土壤中铅、锌、铜、铁、锰和铬的含量升高，而对照土壤中这些金属的含量较低。IIN、Cd 和 PLI 表明，矿区和附近的耕地土壤恶化最严重，而远离矿区的土壤质量有所改善。ERA显示，由于矿区和最近的耕地土壤（F1和F4地点）主要存在铅、锌和铜，因此生态风险指数很高。因此，作为矿山废弃物处理渠道的耕地土壤不利于种植粮食作物。这项研究清楚地表明，铅锌矿开采活动将重金属带入了矿区周围的耕地土壤中。
{"title":"Ecological Risk Assessment of Potentially Toxic Metals in Arable Soils around Adudu Lead – Zinc Mine, North-Central Nigeria","authors":"J. Onwuka, E. Jasper, Gladys Onwuka","doi":"10.18596/jotcsa.1360723","DOIUrl":"https://doi.org/10.18596/jotcsa.1360723","url":null,"abstract":"Mining is a major source of toxic heavy metals into the soil when mine wastes are discharged into the nearby farmlands used for the cultivation of food crops. This study investigated the influence of Pb–Zn mining on the quality and ecological risk of arable soils around active mining sites in Adudu, Nasarawa State, Nigeria. Composite soil samples were collected at 0–20 cm depth, pulverized, and analyzed for heavy metal (Al, As, Cr, Cu, Fe, Mn, Pb, and Zn) concentration using X–ray fluorescence technique. Enrichment factor, geo–accumulation index, improved Nemerow index (IIN), contamination factor (CF), degree of contamination (Cd), pollution load index (PLI), and ecological risk assessment (ERA) were used to evaluate the effect of the mining activities on the environment. Results showed elevated levels of Pb, Zn, Cu, Fe, Mn, and Cr in arable soils around the mine and lower levels of these metals in the control soil. IIN, Cd, and PLI showed that the mine and the nearby arable soils were the most deteriorated, and soil quality improved away from the mining vicinity. ERA revealed that the mine and the closest arable soils (sites F1 and F4) have significant to high ecological risk index as a result of the dominant presence of Pb, Zn, and Cu at the sites. Thus, arable soils which are disposal channels for mine wastes are not good for growing food crops. This study clearly shows that Pb–Zn mining activities introduced heavy metals into the arable soils surrounding the mine.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139630597","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}
Graphene, a carbon allotrope, is a two-dimensional honeycomb of carbon atoms. Although graphene is a thin material, it is the strongest material known on Earth thanks to the strong carbon bonds in its structure. It is stated that the strength of these carbon bonds in graphene is about 100 times stronger than steel. In this study, graphite was first converted into graphene oxide (GO) by the Improved Hummers method, which is one of the methods suitable for large-scale production. Reduced graphene oxide (RGO) was obtained from the synthesized GOs by thermal reduction. TGA, FTIR, XRD, XPS, Raman, BET, and SEM analyses were used to characterize GO produced using the improved Hummers method and RGO reduced by thermal methods. TGA measurements show that RGO produced using the thermal approach had a lower mass loss than graphite oxidized using the improved Hummers process. This shows that the GO sample prepared using the improved Hummers approach contains a considerable number of distinct oxygen-containing groups. The novelty of the modified Hummers' method lies in its enhanced efficiency in producing graphene oxide through reduced thermal reaction times and improved scalability compared to the original approach in the literature. The C:O ratio of the GO and RGO samples was determined by XPS to be 1.88 and 11.17, respectively. The ID/IG ratio obtained by Raman analysis was 0.973. In addition, RGO's BET surface area was discovered to be 543.6 m2 g-1. These findings demonstrated that graphite was successfully oxidized by an improved Hummers method, and the resulting GO was thermally converted to few-layer RGO.
{"title":"Large-scale Production of Few-Layer Reduced Graphene Oxide by the Rapid Thermal Reduction of Graphene Oxide and Its Structural Characterization","authors":"Osman Eksik","doi":"10.18596/jotcsa.1327988","DOIUrl":"https://doi.org/10.18596/jotcsa.1327988","url":null,"abstract":"Graphene, a carbon allotrope, is a two-dimensional honeycomb of carbon atoms. Although graphene is a thin material, it is the strongest material known on Earth thanks to the strong carbon bonds in its structure. It is stated that the strength of these carbon bonds in graphene is about 100 times stronger than steel. In this study, graphite was first converted into graphene oxide (GO) by the Improved Hummers method, which is one of the methods suitable for large-scale production. Reduced graphene oxide (RGO) was obtained from the synthesized GOs by thermal reduction. TGA, FTIR, XRD, XPS, Raman, BET, and SEM analyses were used to characterize GO produced using the improved Hummers method and RGO reduced by thermal methods. TGA measurements show that RGO produced using the thermal approach had a lower mass loss than graphite oxidized using the improved Hummers process. This shows that the GO sample prepared using the improved Hummers approach contains a considerable number of distinct oxygen-containing groups. The novelty of the modified Hummers' method lies in its enhanced efficiency in producing graphene oxide through reduced thermal reaction times and improved scalability compared to the original approach in the literature. The C:O ratio of the GO and RGO samples was determined by XPS to be 1.88 and 11.17, respectively. The ID/IG ratio obtained by Raman analysis was 0.973. In addition, RGO's BET surface area was discovered to be 543.6 m2 g-1. These findings demonstrated that graphite was successfully oxidized by an improved Hummers method, and the resulting GO was thermally converted to few-layer RGO.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514730","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}
M. Bamigboye, Ayinla Ibrahim Kuranga, Orimolade Benjami̇n, Ayuba Mustapha, Olayinka Ojo, Jamiu Wasi̇u, Aishat A Abdulgani̇y, Hameeda Sinmiloluwa Oba
In this study, a composite adsorbent consisting of ZnO nanoparticles and cellulose acetate nanoparticles was prepared. The composite was extensively characterized through Scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray Spectroscopy (EDX), and Brunnaeur Emmet Teller analysis (BET). Batch adsorption experiments were carried out to study the effects of concentration of adsorbate (10- 80 mL), dose of adsorbent (0.1 – 1 g), pH(3-13), contact or exposure time (30-180 minutes) and temperature(30 - 70℃) on the removal of benzene and toluene using the synthesized adsorbent. The pseudo-second-order model well described the kinetics of adsorption studied, and Langmuir's isotherm best described the isotherm modeling of the adsorption data. Thermodynamic studies revealed that all the adsorption processes are feasible, endothermic, and spontaneous. The prepared adsorbent is suitable for removing benzene and toluene from wastewater.
本研究制备了一种由氧化锌纳米颗粒和醋酸纤维素纳米颗粒组成的复合吸附剂。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、能量色散 X 射线光谱（EDX）和布鲁内尔-艾美特-特勒分析（BET）对该复合材料进行了广泛表征。批量吸附实验研究了吸附剂浓度（10- 80 mL）、吸附剂剂量（0.1- 1 g）、pH 值（3-13）、接触或暴露时间（30-180 分钟）和温度（30-70℃）对合成吸附剂去除苯和甲苯的影响。伪二阶模型很好地描述了所研究的吸附动力学，朗缪尔等温线最好地描述了吸附数据的等温线模型。热力学研究表明，所有的吸附过程都是可行的、内热的和自发的。所制备的吸附剂适用于去除废水中的苯和甲苯。
{"title":"Adsorptive Removal of Volatile Organic Compounds from Industrial Effluent Using Synthesized ZnO-CA Composite Base Adsorbent","authors":"M. Bamigboye, Ayinla Ibrahim Kuranga, Orimolade Benjami̇n, Ayuba Mustapha, Olayinka Ojo, Jamiu Wasi̇u, Aishat A Abdulgani̇y, Hameeda Sinmiloluwa Oba","doi":"10.18596/jotcsa.1247149","DOIUrl":"https://doi.org/10.18596/jotcsa.1247149","url":null,"abstract":"In this study, a composite adsorbent consisting of ZnO nanoparticles and cellulose acetate nanoparticles was prepared. The composite was extensively characterized through Scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-ray Spectroscopy (EDX), and Brunnaeur Emmet Teller analysis (BET). Batch adsorption experiments were carried out to study the effects of concentration of adsorbate (10- 80 mL), dose of adsorbent (0.1 – 1 g), pH(3-13), contact or exposure time (30-180 minutes) and temperature(30 - 70℃) on the removal of benzene and toluene using the synthesized adsorbent. The pseudo-second-order model well described the kinetics of adsorption studied, and Langmuir's isotherm best described the isotherm modeling of the adsorption data. Thermodynamic studies revealed that all the adsorption processes are feasible, endothermic, and spontaneous. The prepared adsorbent is suitable for removing benzene and toluene from wastewater.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139234655","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}
In recent years, there has been a significant shift towards the production of advanced nanomaterials using sustainable methods, reflecting a heightened focus on reducing environmental impact and optimizing resource utilization. This growing interest stems from the necessity to address environmental concerns and embrace eco-friendly practices in material synthesis. The primary objective of this study is to explore the eco-friendly synthesis of novel metal oxide nanoparticles (NPs) by utilizing bio-waste as a sustainable precursor. The central theme revolves around employing ultrasound-assisted techniques for Cu2O NP synthesis, with a specific emphasis on utilizing avocado peel waste as an effective phytochemical compound for capping. Through systematic process optimization, we conducted a comprehensive assessment of the resulting NPs, delving into their chemical, thermal, and surface properties. Advanced characterization techniques, including X-ray Diffraction analysis (XRD), Transmission Electron Microscopy (TEM), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), and Fourier-transform Infrared Spectroscopy (FT-IR), were employed to gain profound insights into the attributes of the synthesized NPs. Our experimental results conclusively demonstrate the successful synthesis of spherical Cu2O NPs, each with a diameter of 25 ± 2 nm. This was achieved by utilizing avocado peel waste (APW) and ultrasound-assisted cavitation at room temperature. The study significantly contributes to our understanding of the potential applications of green synthesis methods, paving the way for environmentally friendly and cost-effective Cu2O NPs.
{"title":"Sustainable Synthesis of Green Cu2O Nanoparticles using Avocado Peel Extract as Biowaste Source","authors":"Fatih Özbaş","doi":"10.18596/jotcsa.1391735","DOIUrl":"https://doi.org/10.18596/jotcsa.1391735","url":null,"abstract":"In recent years, there has been a significant shift towards the production of advanced nanomaterials using sustainable methods, reflecting a heightened focus on reducing environmental impact and optimizing resource utilization. This growing interest stems from the necessity to address environmental concerns and embrace eco-friendly practices in material synthesis. The primary objective of this study is to explore the eco-friendly synthesis of novel metal oxide nanoparticles (NPs) by utilizing bio-waste as a sustainable precursor. The central theme revolves around employing ultrasound-assisted techniques for Cu2O NP synthesis, with a specific emphasis on utilizing avocado peel waste as an effective phytochemical compound for capping. Through systematic process optimization, we conducted a comprehensive assessment of the resulting NPs, delving into their chemical, thermal, and surface properties. Advanced characterization techniques, including X-ray Diffraction analysis (XRD), Transmission Electron Microscopy (TEM), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), and Fourier-transform Infrared Spectroscopy (FT-IR), were employed to gain profound insights into the attributes of the synthesized NPs. Our experimental results conclusively demonstrate the successful synthesis of spherical Cu2O NPs, each with a diameter of 25 ± 2 nm. This was achieved by utilizing avocado peel waste (APW) and ultrasound-assisted cavitation at room temperature. The study significantly contributes to our understanding of the potential applications of green synthesis methods, paving the way for environmentally friendly and cost-effective Cu2O NPs.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139234263","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}
This study reports the synthesis of seven hydrazone derivative complexes by the treatment equivalent molar of the phosphine ligand Ph2P(CH2)nPPh2 {where n= 1 dppm; n=2 dppe; n=3 dppp; n=4 dppb; (CH2)n = (Cp)2Fe} with [Pd(dbeoz)2] afforded complexes of the type [Pd(dbeoz)2(diphos)] and [Pd(dbeoz)2(dppm)]2, whereas the reaction of two moles of Ph3P with [Pd(dbeoz)2] gave a complex [Pd(dbeoz)2(PPh3)2] in good yield. CHN analysis, conductivity measurements, Fourier Transform Infrared (FT-IR), 1H, and 31P-NMR, were used to investigate the structural geometries of the complexes. Further, the biological activity of the synthesized complexes was evaluated against three pathogenic bacteria (Pseudomonas aeruginosa, Bacillus subtilis, and Escherichia coli) using the well diffusion method, the synthesized complexes displayed moderate to good inhibitory activity, and the [Pd(dbeoz)2(dppf)] complex exhibited the highest inhibitory activity with DIZ is 24, 27, and 28 mm against the three pathogenic bacteria, respectively.
{"title":"Synthesis, Spectroscopic Analysis, and Anti-Bacterial Studies of Pd(II) Complexes of Phosphine and Hydrazone Derivatives","authors":"Laith H. K. AL-JİBORİ, Ahmed SHAKER MARMUS","doi":"10.18596/jotcsa.1343254","DOIUrl":"https://doi.org/10.18596/jotcsa.1343254","url":null,"abstract":"This study reports the synthesis of seven hydrazone derivative complexes by the treatment equivalent molar of the phosphine ligand Ph2P(CH2)nPPh2 {where n= 1 dppm; n=2 dppe; n=3 dppp; n=4 dppb; (CH2)n = (Cp)2Fe} with [Pd(dbeoz)2] afforded complexes of the type [Pd(dbeoz)2(diphos)] and [Pd(dbeoz)2(dppm)]2, whereas the reaction of two moles of Ph3P with [Pd(dbeoz)2] gave a complex [Pd(dbeoz)2(PPh3)2] in good yield. CHN analysis, conductivity measurements, Fourier Transform Infrared (FT-IR), 1H, and 31P-NMR, were used to investigate the structural geometries of the complexes. Further, the biological activity of the synthesized complexes was evaluated against three pathogenic bacteria (Pseudomonas aeruginosa, Bacillus subtilis, and Escherichia coli) using the well diffusion method, the synthesized complexes displayed moderate to good inhibitory activity, and the [Pd(dbeoz)2(dppf)] complex exhibited the highest inhibitory activity with DIZ is 24, 27, and 28 mm against the three pathogenic bacteria, respectively.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139229900","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}
A new nanocatalyst graphene oxide@dopamine-Cu was synthesized, and its structure was characterized by fourier transform infrared (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Energy Dispersive X-ray Spectrometry (EDX), and thermogravimetric analysis – differential thermal analysis (TGA-DTA) techniques. The three-component one-pot reaction between an arylamine, aromatic aldehyde, and acetylenic carboxylate was achieved and formed methyl 5-oxo-2-aryl-4-(arylamino)-2,5-dihydrofuran-3-carboxylate derivatives (4) in the presence of the catalytic amount of graphene oxide@dopamine-Cu nanocatalyst in high yield. Molecular structures of products were characterized by FT-IR, 1H, 13C nuclear magnetic resonance (NMR), and Mass spectroscopy techniques. Representatively, the mass fragmentation of 4a was discussed, and the structure was confirmed. Easy reaction, high performance, and easy catalyst recyclability are the main advantages of this work. This nanocatalyst is recycled up to five successive runs.
合成了一种新型纳米催化剂氧化石墨烯@多巴胺-铜，并通过傅立叶变换红外（FT-IR）、X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、能量色散 X 射线光谱（EDX）和热重分析-差热分析（TGA-DTA）技术对其结构进行了表征。在催化量的氧化石墨烯@多巴胺-铜纳米催化剂存在下，芳胺、芳香醛和乙炔基羧酸酯实现了三组分一锅反应，并高产率地生成了 5-氧代-2-芳基-4-（芳基氨基）-2,5-二氢呋喃-3-羧酸甲酯衍生物（4）。利用傅立叶变换红外光谱、1H、13C 核磁共振（NMR）和质谱技术对产物的分子结构进行了表征。其中，对 4a 的质量碎片进行了讨论，并确认了其结构。反应简便、性能优异、催化剂易于回收利用是这项工作的主要优点。该纳米催化剂可连续循环使用五次。
{"title":"GO@dopamine-Cu as a Green Nanocatalyst for the Efficient Synthesis of Fully Substituted Dihydrofuran-2(5H)-ones","authors":"Neda Niknam, N. Noroozi Pesyan","doi":"10.18596/jotcsa.1264129","DOIUrl":"https://doi.org/10.18596/jotcsa.1264129","url":null,"abstract":"A new nanocatalyst graphene oxide@dopamine-Cu was synthesized, and its structure was characterized by fourier transform infrared (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Energy Dispersive X-ray Spectrometry (EDX), and thermogravimetric analysis – differential thermal analysis (TGA-DTA) techniques. The three-component one-pot reaction between an arylamine, aromatic aldehyde, and acetylenic carboxylate was achieved and formed methyl 5-oxo-2-aryl-4-(arylamino)-2,5-dihydrofuran-3-carboxylate derivatives (4) in the presence of the catalytic amount of graphene oxide@dopamine-Cu nanocatalyst in high yield. Molecular structures of products were characterized by FT-IR, 1H, 13C nuclear magnetic resonance (NMR), and Mass spectroscopy techniques. Representatively, the mass fragmentation of 4a was discussed, and the structure was confirmed. Easy reaction, high performance, and easy catalyst recyclability are the main advantages of this work. This nanocatalyst is recycled up to five successive runs.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139238545","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}
Solid polymer electrolytes (SPEs) have been considerably investigated due to various electrochemical device applications. Most of the SPEs comprise polymer as a host material to provide strength and good mechanical stability and salt that transfers charge carriers to cause conductivity. Nanocomposite solid polymer electrolyte membranes based on poly(vinyl alcohol) (PVA)-poly(ethylene glycol) (PEG) blend complexed with LiClO4 and nanofillers Al2O3 at different weight percent ratios have been obtained by using electrospinning method. The conductivity and structural properties of the different systems have been characterized by using various experimental approaches such as X-ray diffraction (XRD) and Fourier transform infrared FTIR spectroscopy. The ionic conductivity of the systems has been measured by using an LCR meter in a temperature ranging from 298 to 353 K. Maximum ionic conductivity of 1.58 × 10-4 S cm-1 at room temperature has been observed for the system of PVA-PEG-LiClO4-Al2O3 (50-25-15-10) with 15 wt% weight percent of LiClO4 salt in PVA-PEG blend matrix. The ac conductivity report indicates that the ionic conductivity of the PVA-PEG-LiClO4-Al2O3 complex is influenced by the concentration of LiClO4. The effect of temperature on the ionic conductivity of polymer electrolyte complexes has been estimated by changing the temperature ranging from 298 to 353 K. However, the conductivity of the nanofiber polymer electrolyte systems increases with the rise of temperature, and the maximum conductivity of 1.58 × 10-2 S cm-1 has been recorded at 353 K. The temperature-dependent conductivity follows the Arrhenius behavior.
固体聚合物电解质（SPE）因其在各种电化学设备中的应用而受到广泛研究。大多数固态聚合物电解质都由聚合物和盐组成，聚合物作为主材料可提供强度和良好的机械稳定性，而盐则可转移电荷载流子，从而提高导电性。利用电纺丝方法获得了基于聚（乙烯醇）（PVA）-聚（乙二醇）（PEG）共混物的纳米复合固体聚合物电解质膜，该膜与氯化锂和纳米填料 Al2O3 按不同的重量百分比比例复配。利用 X 射线衍射 (XRD) 和傅立叶变换红外光谱等多种实验方法对不同体系的电导率和结构特性进行了表征。在室温下，PVA-PEG-LiClO4-Al2O3（50-25-15-10）体系的最大离子电导率为 1.58 × 10-4 S cm-1，PVA-PEG 混合基质中的 LiClO4 盐的重量百分比为 15%。交流电导率报告表明，PVA-PEG-LiClO4-Al2O3 复合物的离子电导率受 LiClO4 浓度的影响。然而，纳米纤维聚合物电解质体系的电导率随着温度的升高而增加，在 353 K 时记录到最大电导率 1.58 × 10-2 S cm-1。
{"title":"Studies of the Properties of New Electrospun Based on PVA-PEG Polymer Systems Electrolytes for Energy Storage Devices","authors":"Ramat Gul, Wan Ahmad Kamil Mahmood","doi":"10.18596/jotcsa.1262560","DOIUrl":"https://doi.org/10.18596/jotcsa.1262560","url":null,"abstract":"Solid polymer electrolytes (SPEs) have been considerably investigated due to various electrochemical device applications. Most of the SPEs comprise polymer as a host material to provide strength and good mechanical stability and salt that transfers charge carriers to cause conductivity. Nanocomposite solid polymer electrolyte membranes based on poly(vinyl alcohol) (PVA)-poly(ethylene glycol) (PEG) blend complexed with LiClO4 and nanofillers Al2O3 at different weight percent ratios have been obtained by using electrospinning method. The conductivity and structural properties of the different systems have been characterized by using various experimental approaches such as X-ray diffraction (XRD) and Fourier transform infrared FTIR spectroscopy. The ionic conductivity of the systems has been measured by using an LCR meter in a temperature ranging from 298 to 353 K. Maximum ionic conductivity of 1.58 × 10-4 S cm-1 at room temperature has been observed for the system of PVA-PEG-LiClO4-Al2O3 (50-25-15-10) with 15 wt% weight percent of LiClO4 salt in PVA-PEG blend matrix. The ac conductivity report indicates that the ionic conductivity of the PVA-PEG-LiClO4-Al2O3 complex is influenced by the concentration of LiClO4. The effect of temperature on the ionic conductivity of polymer electrolyte complexes has been estimated by changing the temperature ranging from 298 to 353 K. However, the conductivity of the nanofiber polymer electrolyte systems increases with the rise of temperature, and the maximum conductivity of 1.58 × 10-2 S cm-1 has been recorded at 353 K. The temperature-dependent conductivity follows the Arrhenius behavior.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139263929","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}
Sibel Başakçılardan Kabakcı, B. Cevik, Gamze Sultan BAŞ BERKEM
Delignification is a crucial pretreatment in the production of diverse value-added products from lignocellulosics. While modifying the surface functional groups, delignification also increases the specific surface area by providing a porous structure to the lignocellulosic biomass. Hydrothermal pretreatment can be used prior to delignification, to recover hemicellulose and boost delignification. By removing lignin and hemicellulose, cellulose-rich pulp becomes more accessible for activation. In the present study, three different activated carbons were prepared: activated carbon from tea stalk itself (ATS), activated carbon from tea stalk pulp obtained by using glycerol organosolv pretreatment (ATP), activated carbon from tea stalk hydrochar pulp obtained by using sequential hydrothermal pretreatment-organosolv delignification (AHTP). Each precursor was carbonized (at 800 °C) in the presence of KOH (KOH/precursor: 2/1). Activated carbons were characterized for their elemental content, surface functional groups, thermal stability, crystallinity, surface morphology, surface area and porous structure using elemental analysis (C-H-N-S), FTIR, TGA, XRD, SEM and, BET analysis, respectively. While hydrothermal pretreatment prior to organosolv pulping reduced the delignification yield, it also altered the pore structure of activated carbon. Among the activated carbons, only ATS had microporous structure with an average pore radius of 1 nm. ATP had the highest surface area (2056.72 m2/g) and micropore volume (0.81 cm3/g). Having mesopores (with an average pore radius of 5.74 nm) in its structure, AHTP had the least micropore volume (0.464 cm3/g) and surface area (1179.71 m2/g). The presence of micro and mesopores broadens the potential applications of activated carbon ranging from environmental applications to energy storage.
{"title":"Microporous and Mesoporous Activated Carbons from Tea Stalk and Tea Stalk Pulps: Effect of Lignin Removal by One-Step and Two-Step Organosolv Treatment","authors":"Sibel Başakçılardan Kabakcı, B. Cevik, Gamze Sultan BAŞ BERKEM","doi":"10.18596/jotcsa.1362724","DOIUrl":"https://doi.org/10.18596/jotcsa.1362724","url":null,"abstract":"Delignification is a crucial pretreatment in the production of diverse value-added products from lignocellulosics. While modifying the surface functional groups, delignification also increases the specific surface area by providing a porous structure to the lignocellulosic biomass. Hydrothermal pretreatment can be used prior to delignification, to recover hemicellulose and boost delignification. By removing lignin and hemicellulose, cellulose-rich pulp becomes more accessible for activation. In the present study, three different activated carbons were prepared: activated carbon from tea stalk itself (ATS), activated carbon from tea stalk pulp obtained by using glycerol organosolv pretreatment (ATP), activated carbon from tea stalk hydrochar pulp obtained by using sequential hydrothermal pretreatment-organosolv delignification (AHTP). Each precursor was carbonized (at 800 °C) in the presence of KOH (KOH/precursor: 2/1). Activated carbons were characterized for their elemental content, surface functional groups, thermal stability, crystallinity, surface morphology, surface area and porous structure using elemental analysis (C-H-N-S), FTIR, TGA, XRD, SEM and, BET analysis, respectively. While hydrothermal pretreatment prior to organosolv pulping reduced the delignification yield, it also altered the pore structure of activated carbon. Among the activated carbons, only ATS had microporous structure with an average pore radius of 1 nm. ATP had the highest surface area (2056.72 m2/g) and micropore volume (0.81 cm3/g). Having mesopores (with an average pore radius of 5.74 nm) in its structure, AHTP had the least micropore volume (0.464 cm3/g) and surface area (1179.71 m2/g). The presence of micro and mesopores broadens the potential applications of activated carbon ranging from environmental applications to energy storage.","PeriodicalId":17299,"journal":{"name":"Journal of the Turkish Chemical Society Section A: Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139282415","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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