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Agonistic and antagonistic effects of both aqueous and alcoholic extracts of plants containing copper and silver nanoparticles on Escherichia coli and Proteus mirabilis 含铜和银纳米颗粒的植物水萃取物和酒精萃取物对大肠杆菌和奇异变形杆菌的激动和拮抗作用
Q2 Materials Science Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100475
Shohreh Torabi, Fatemeh Keshavarzi
This study aimed to investigate and compare the inhibitory effects of copper and silver nanoparticles (NPs), as well as aqueous and alcoholic extracts of yarrow and chamomile against E. coli and P. mirabilis bacteria. The extracts were prepared from fresh leaves of chamomile and yarrow plants using the maceration method. Copper NPs were purchased and silver NPs were prepared through the chemical recovery method. The bactericidal effects were measured by changes in the zone of inhibition (ZoI). The absence of a ZoI was interpreted as resistant, <5 mm as semi-sensitive, and >5 mm as sensitive. The results indicated that the NPs had an approximate size of 7 nm. The diameter of the ZoI in aqueous extracts of chamomile and yarrow was greater for E. coli compared to P. mirabilis, while in alcoholic extracts this relationship was reversed. The concentration of 0.4 μg/μL of copper and silver NPs for both bacteria was the most effective concentration of bactericidal NPs. The combined effect of copper NPs and extracts on E. coli and P. mirabilis indicated that the largest ZoI was associated with the alcoholic extract of chamomile (11 mm) and the aqueous extract of yarrow (13 mm), respectively, at a concentration of 0.4 μg/μL of copper NPs. Antagonistic effects of copper NPs on E. coli and P. mirabilis were observed, with an increase in the concentration of copper NPs leading to a larger non-growth halo diameter. The comparison of the bactericidal effects of the extract-nanoparticle combination and the ZoI results of the antibiogram test for 4 antibiotics revealed that the diameter of the ZoI formed by ciprofloxacin was 24 mm for E. coli and 35 mm for P. mirabilis. The difference ZoI of ciprofloxacin on E.coli compared to other antibiotics, as well as the ZoI of chamomile alcoholic extract and yarrow aqueous extract on E. coli and P. mirabilis, was found to be significant (p < 0.05). Furthermore, the minimum inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) were observed at a concentration of 500 and 250 μL of the combination of silver NPs + aqueous yarrow extract and the combination of copper NPs + aqueous yarrow extract, respectively. Future research should continue to explore these parameters to develop more effective and sustainable approaches to nanoparticle synthesis.
本研究旨在探讨并比较纳米铜和纳米银以及蓍草和洋甘菊水提液和醇提液对大肠杆菌和奇异杆菌的抑制作用。以洋甘菊和蓍草的鲜叶为原料,采用浸渍法制备提取物。通过化学回收法制备了铜NPs和银NPs。通过抑制区(ZoI)的变化来测定其杀菌效果。没有ZoI被解释为耐药,>; 5mm为半敏感,>; 5mm为敏感。结果表明,NPs的尺寸约为7 nm。洋甘菊和蓍草水提物中大肠杆菌的ZoI直径大于神奇芽孢杆菌,而在酒精提取物中这种关系相反。铜和银的NPs浓度均为0.4 μg/μL,是两种细菌的最有效杀菌NPs浓度。铜NPs及其提取物对大肠杆菌和奇异芽孢杆菌的综合作用表明,当铜NPs浓度为0.4 μg/μL时,洋甘菊醇提物(11 mm)和蓍草水提物(13 mm)的ZoI最大。铜NPs对大肠杆菌和奇异杆菌具有拮抗作用,铜NPs浓度的增加导致非生长晕直径的增大。比较提取液-纳米颗粒组合对4种抗生素的抗菌谱试验结果,发现环丙沙星对大肠杆菌形成的ZoI直径为24 mm,对奇异杆菌形成的ZoI直径为35 mm。环丙沙星对大肠杆菌的ZoI与其他抗生素相比差异显著,洋甘菊醇提物和蓍草水提物对大肠杆菌和神奇杆菌的ZoI差异显著(p <;0.05)。此外,在500 μL和250 μL浓度下,银NPs +亚蓍草水提物和铜NPs +亚蓍草水提物的组合分别具有最小抑菌浓度(MIC)和最小杀菌浓度(MBC)。未来的研究应继续探索这些参数,以开发更有效和可持续的纳米颗粒合成方法。
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引用次数: 0
Optimization and comparative performance of Jatropha Curcas extracts for turbidity removal in water treatment 麻疯树水处理除浊液的优化及性能比较
Q2 Materials Science Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100497
Amal Al-Hanaktah, Soraya Mercedes Pérez, Ashraf Alsafasfeh
This study assesses the coagulation potential of Jatropha Curcas leaf, shell, and kernel extracts for removing turbidity from synthetic water. Process optimization was conducted using Response Surface Methodology with a Central Composite Design, focusing on coagulant dosage, pH, and temperature as independent variables, and turbidity removal as the response variable. Quadratic models showed strong fits (R2 = 0.9191 for leaf, 0.8720 for shell, and 0.8962 for kernel). Dosage was the most influential factor, with optimized coagulation efficiencies of 95.02 % for leaf, 92.66 % for shell, and 91.44 % for kernel extracts at specific conditions: 1 % v/v (leaf) at pH 8.3 and 45 °C; 0.5 % v/v (shell) at pH 3 and 15 °C; and 4 % v/v (kernel) at pH 8.3 and 45 °C. However, validation and comparison with alum were performed under neutral pH and room temperature to reflect practical application and allow a fair comparison with alum performance. In this setting, alum (4 % dose) achieved 98.76 % removal, while the leaf extract reached 88.83 %, followed by the shell at 78.05 % and the kernel at 77.05 %, all using optimized doses. Cost analysis revealed that the shell extract was the most economical at 0.05 USD/m3, while the leaf extract (2.0 USD/m3) had a favourable efficiency-to-cost ratio. The kernel extract was least cost-effective at 24.0 USD/m3. Compared to alum (20 USD/m3), both Jatropha leaf and shell extracts show promise as sustainable, low-cost coagulants.
本研究评估麻疯树叶、壳和仁提取物去除合成水中浊度的凝血电位。以混凝剂投加量、pH、温度为自变量,浊度去除率为响应变量,采用响应面法和中心复合设计进行工艺优化。二次模型拟合较好(叶片R2 = 0.9191,壳R2 = 0.8720,仁R2 = 0.8962)。在pH 8.3、45℃条件下,浓度为1% v/v(叶)时,叶、壳、仁提取物的混凝效率分别为95.02%、92.66%和91.44%;0.5% v/v(壳),pH值为3,温度为15℃;在pH 8.3和45°C下,4% v/v(核)。然而,为了反映实际应用,并与明矾的性能进行公平比较,我们在中性pH和室温下进行了验证和与明矾的比较。在此条件下,明矾(4%)的去除率为98.76%,而叶提取物的去除率为88.83%,其次是壳(78.05%)和仁(77.05%)。成本分析表明,壳提取液在0.05 USD/m3时最经济,而叶提取液(2.0 USD/m3)具有较好的效率成本比。果仁提取物的成本效益最低,为24.0 USD/m3。与明矾(20美元/立方米)相比,麻风树叶和壳提取物都有望成为可持续的低成本混凝剂。
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引用次数: 0
Facile synthesis of neodymium-doped biomass-derived graphene nanosheets and electrochemical properties 掺钕生物质衍生石墨烯纳米片的简易合成及其电化学性能
Q2 Materials Science Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100491
Kerista Tarigan , Rikson Siburian , Yong Ching Chan , Yosia Gopas Oetama Manik , Joys Alisa Angelina Hutapea , Ronn Goei , Alfred Iing Yoong Tok , Isa Anshori , Yudan Wulanza , Yatimah Alias
This research aims to develop a sustainable and high-performance electrode materials by synthesizing neodymium-doped graphene nanosheets (Nd/GNS) from renewable candlenut shell biomass using a facile impregnation method. The study investigates the structural, electronic, and electrochemical properties of Nd/GNS with varying Nd concentrations (10–30 % (w/v)). Advanced characterization techniques, including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Raman Spectroscopy and X-ray photoelectron spectroscopy (XPS), confirmed the successful incorporation of Nd, the formation of Nd-O-C bonds, and enhanced oxygen functionalities without disrupting the original graphene lattice. XPS analysis revealed stable Nd3+ oxidation states and strong coordination interactions, enhancing chemical stability. Electrochemical performance, evaluated through cyclic voltammetry (CV) and linear sweep voltammetry (LSV), demonstrated that 20 % Nd-doped GNS achieved optimal results, with a maximum current density of 2.011 A cm−2 and a charge storage capacity of 0.1634 A V, surpassing commercial graphene by 38 %. This enhancement is attributed to Nd-induced lattice defects, expanded interlayer spacing, and increased pseudo capacitance, offering more active sites for electrochemical reactions. By integrating biomass utilization with rare-earth doping, this study provides a cost-effective and scalable pathway for producing high-performance materials for energy storage and catalytic applications, particularly in supercapacitors and water splitting.
本研究以可再生的蜡烛壳生物质为原料,采用易浸渍法合成掺钕石墨烯纳米片(Nd/GNS),旨在开发一种可持续的高性能电极材料。研究了不同Nd浓度(10 - 30% (w/v))下Nd/GNS的结构、电子和电化学性能。先进的表征技术,包括x射线衍射(XRD),傅里叶变换红外光谱(FTIR),拉曼光谱和x射线光电子能谱(XPS),证实了Nd的成功结合,Nd- o - c键的形成,以及在不破坏原始石墨烯晶格的情况下增强的氧官能团。XPS分析显示Nd3+氧化态稳定,配位作用强,化学稳定性增强。通过循环伏安法(CV)和线性扫描伏安法(LSV)评估的电化学性能表明,掺20% nd的GNS达到了最佳效果,最大电流密度为2.011 a cm−2,电荷存储容量为0.1634 a V,比商用石墨烯高出38%。这种增强归因于nd诱导的晶格缺陷,扩大的层间距和增加的伪电容,为电化学反应提供了更多的活性位点。通过将生物质利用与稀土掺杂相结合,本研究为生产用于储能和催化应用的高性能材料提供了一种具有成本效益和可扩展的途径,特别是在超级电容器和水分解方面。
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引用次数: 0
Green recovery of amorphous silica from silicone waste: Alkali activation and thermal treatment 无机硅废弃物中无定形二氧化硅的绿色回收:碱活化和热处理
Q2 Materials Science Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100490
Wichain Chailad , Suchalinee Mathurosemontri , Waroonsiri Jakrabutr , Kullawadee Sungsanit , Chaiwute Vudjung , Pruttipong Pantamanatsopa , Saowaluk Boonyod , Nichanan Phansroy
This study presents a green and sustainable method for recovering high-purity silica from solid silicone by-products derived from industrial silicone oil manufacturing through alkali-assisted sol–gel synthesis, with and without thermal treatment. Sodium hydroxide and sodium carbonate were used to evaluate the effects of alkali type, concentration, and calcination at 800 °C on silica yield, structure, and performance. Sodium carbonate-treated and calcined samples achieved the highest silica yield (up to 90.7 %) and purity (>92 wt% SiO2), while maintaining predominantly amorphous structures with enhanced thermal stability and porosity. In contrast, sodium hydroxide treatments, particularly at higher concentrations, induced partial crystallisation and reduced adsorption capacity. The synthesised silica showed effective methylene blue adsorption, supporting its application in wastewater treatment. This acid-free recovery process provides an environmentally friendly pathway for valorising silicone waste, contributing to circular economy strategies and the development of sustainable functional materials.
本研究提出了一种绿色和可持续的方法,通过碱辅助溶胶-凝胶合成从工业硅油生产中产生的固体硅副产品中回收高纯度二氧化硅,并进行了热处理。用氢氧化钠和碳酸钠考察了碱类型、浓度和800℃煅烧对二氧化硅产率、结构和性能的影响。碳酸钠处理和煅烧的样品获得了最高的二氧化硅收率(高达90.7%)和纯度(>92 wt% SiO2),同时保持了主要的无定形结构,增强了热稳定性和孔隙率。相反,氢氧化钠处理,特别是在较高浓度下,诱导部分结晶和降低吸附能力。合成的二氧化硅对亚甲基蓝有较好的吸附效果,支持其在废水处理中的应用。这种无酸回收过程为有机硅废物的增值提供了一种环保途径,有助于循环经济战略和可持续功能材料的发展。
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引用次数: 0
Characterization of orange-fleshed sweet potato starch nanoparticles produced by acid hydrolysis 酸水解法制备红薯淀粉纳米粒的表征
Q2 Materials Science Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100488
Nguyen Chi Dung , Tran Ngoc Giau , Hong Van Hao , Nguyen Van Thanh , Nguyen Minh Thuy , Vo Quang Minh , Ngo Van Tai
Sweet potatoes are abundant in starch and have several applications for this component. Starch can be chemically changed to boost its beneficial properties. The objective of this study is to use common, easily accessible, and reasonably priced organic acids to produce modified starch with a nanoscale size from orange-fleshed sweet potato (OFSP). The characterization of OFSP nanostarch were assessed using hydrolysis with three distinct acids (acetic, citric and lactic acid) at concentrations ranging from 5 to 15 %. It was observed that nanostarch's swelling ability and viscosity decreased but its solubility increased during acid hydrolysis. OFSP nanostarch hydrolyzed with 10 % citric acid had a good recovery efficiency and quality suitable. Some physico-chemical properties of OFSP nanostarch were determined. Scanning electron microscopy and transmission electron microscopy were observed. The size of OFSP nanocrystals is in the range of 900–930 nm. The Fourier transform infrared (FTIR) spectrum of acid-treated starch contained 22 spectral peaks ranging from 3282.84 cm−1 to 418.55 cm−1, which indicated the vibrations of glycosidic bonds, hydroxyl groups, and CO bonds. Differential scanning calorimetry investigation revealed that sweet potato starch nanocrystals gelatinized at temperatures ranging from 65.4 to 89.1 °C. OFSP starch nanocrystals from acid-treated starch samples exhibited peaks at diffraction angles 2θ around 10°, 11°, 15°, 17°, 18°, 20°, and 23°. Producing nanostarch from OFSP starch not only raises the usage value of this raw material in the producing areas, but it also adds to the long-term development of this resource when the resulting products are well and widely used in various domains.
红薯含有丰富的淀粉,有多种用途。淀粉可以通过化学改变来增强其有益特性。本研究的目的是利用普通的、容易获得的、价格合理的有机酸,从橙肉甘薯(OFSP)中生产纳米级的变性淀粉。用三种不同的酸(乙酸、柠檬酸和乳酸)在浓度为5%至15%的情况下水解OFSP纳米淀粉的特性。酸水解过程中,纳米淀粉的溶胀能力和黏度降低,但溶解度提高。10%柠檬酸水解的OFSP纳米淀粉回收率高,质量适宜。测定了OFSP纳米淀粉的一些理化性质。扫描电镜和透射电镜观察。OFSP纳米晶体的尺寸在900-930 nm之间。酸处理淀粉的傅里叶变换红外(FTIR)光谱在3282.84 cm−1 ~ 418.55 cm−1范围内有22个谱峰,表明了糖苷键、羟基键和CO键的振动。差示扫描量热法研究表明,甘薯淀粉纳米晶在65.4 ~ 89.1℃的温度范围内发生糊化。酸处理后的淀粉样品的OFSP淀粉纳米晶在衍射角2θ处的峰约为10°,11°,15°,17°,18°,20°和23°。利用OFSP淀粉生产纳米淀粉,不仅提高了该原料在产地的使用价值,而且当所得产品在各个领域得到良好和广泛的应用时,也有利于该资源的长期发展。
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引用次数: 0
Removal of amoxicillin from hospital waste using Fe2O3–Ag adsorbent and optimization by response surface methodology and machine learning prediction Fe2O3-Ag吸附剂对医院废弃物中阿莫西林的去除及响应面法和机器学习预测优化
Q2 Materials Science Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100483
Kimia Yavari , Changiz Karami , Sara Bijari , Diba Adami , Mohammad Hassan Shahavi

Purpose

Antibiotic pollution in hospital effluent is a significant environmental concern that contributes to the evolution of antibiotic-resistant bacteria. This study aims to provide effective removal strategies for antibiotics from wastewater.

Materials and methods

In this study, Fe2O3–Ag nanocomposites were prepared and characterized to enhance the sorption of Amoxicillin from water. We employed Response Surface Methodology (RSM) and machine learning models (XGBoost and Random Forest) to optimize the adsorption process, maximizing removal efficiency. The optimal conditions for Amoxicillin removal were determined to be a pH of 6.5, a contact time of 26 min, a temperature of 45 °C, and an adsorbent dosage of 0.185 g. Adsorption isotherm and kinetic studies indicated that the process followed the Langmuir model and pseudo-second-order kinetics, respectively.

Results and Discussion

Machine learning models demonstrated robust predictive performance, with an R2 value of 0.97 for XGBoost. These findings highlight the potential of Fe2O3–Ag nanocomposites as effective adsorbents for antibiotic removal, paving the way for sustainable wastewater treatment solutions.

Conclusions

In conclusion, Fe2O3–Ag nanocomposites can be recognized as effective adsorbents in the removal of antibiotics from wastewater, contributing to the improvement of sustainable wastewater management solutions.
目的医院污水中的抗生素污染是一个重要的环境问题,它有助于抗生素耐药细菌的进化。本研究旨在提供废水中抗生素的有效去除策略。材料与方法制备了Fe2O3-Ag纳米复合材料,并对其进行了表征,以增强对水中阿莫西林的吸附。我们采用响应面法(RSM)和机器学习模型(XGBoost和Random Forest)来优化吸附过程,最大限度地提高去除效率。确定了去除阿莫西林的最佳条件为:pH为6.5,接触时间为26 min,温度为45℃,吸附剂用量为0.185 g。吸附等温线和动力学研究表明,吸附过程符合Langmuir模型和准二级动力学。结果和讨论机器学习模型表现出稳健的预测性能,XGBoost的R2值为0.97。这些发现突出了Fe2O3-Ag纳米复合材料作为抗生素去除的有效吸附剂的潜力,为可持续的废水处理解决方案铺平了道路。结论Fe2O3-Ag纳米复合材料可作为一种有效的吸附剂去除废水中的抗生素,有助于改善废水可持续管理解决方案。
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引用次数: 0
Performance of activated carbon derived from tea twigs for carbon dioxide adsorption 茶枝活性炭对二氧化碳的吸附性能研究
Q2 Materials Science Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2024.100440
Ary Mauliva Hada Putri , Benni F. Ramadhoni , Muhammad Said Hamdani Radias , Fatimah Azizah Riyadi , Md Zahangir Alam , Yuswan Muharam
Activated carbon from agro-industrial waste, namely tea twigs derived from the processing of Camellia Sinensis branches, using a potassium hydroxide activator for CO2 adsorption has been conducted in this study. Various carbonization temperatures (4000C and 5000C) and heating times of 1 h and 3 h were used in this study. The concentration of potassium hydroxide (40 % and 60 %) and the ratios of activator solutions to carbon precursor made from pyrolysis of tea twigs (2:1 and 4:1) were varied for the chemical activation process. The effectiveness results of the obtained activated carbon were characterized through using Brunauer-Emmett-Teller analyzer and Temperature Programme Desorption-CO2 to determine the surface area and capacity maximum of CO2 adsorption. The optimum condition for the synthesis of activated carbon that produces high surface area was obtained at sample CCS 400/1 A2B1 where biochar carbonized at temperature of 400 °C kept for 1 h with a ratio of activator solution and precursor 4:1 using KOH concentration of 40 %. The highest surface area was obtained 1403 m2 g−1 with pore volume 0.9 m2 g−1 and pore size 1.11 nm and proved the presence of microporous areas in produced activated carbon. The maximum CO2 adsorption capacity obtained in this study was 5.1573 mmol g−1. This result could be related to the higher amount of microporous present in the activated carbon that facilitates the access of CO2 to the active sites at the pores of activated carbon.
本研究采用氢氧化钾活化剂对农工废弃物,即茶树枝干加工所得的茶枝进行活性炭吸附。本研究采用了不同的碳化温度(4000C和5000C),加热时间分别为1 h和3 h。在化学活化过程中,改变了氢氧化钾浓度(40%和60%)和活化剂溶液与茶枝热解碳前体的比例(2:1和4:1)。通过brunauer - emmet - teller分析仪和温度程序解吸-CO2对所得活性炭的有效性结果进行了表征,确定了CO2的最大吸附表面积和容量。在样品CCS 400/1 A2B1条件下,以活化剂溶液与前驱体的比例为4:1,KOH浓度为40%,在400℃下炭化1h,获得了合成高比表面积活性炭的最佳条件。所得活性炭的最大比表面积为1403 m2 g−1,孔体积为0.9 m2 g−1,孔径为1.11 nm,证明活性炭中存在微孔区。本研究获得的最大CO2吸附量为5.1573 mmol g−1。这一结果可能与活性炭中存在较多的微孔有关,微孔有利于CO2进入活性炭孔处的活性位点。
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引用次数: 0
Synthesis of rare sugars via epimerization catalyzed by tin-organic frameworks 锡有机骨架催化外映异构合成稀有糖的研究
Q2 Materials Science Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100476
Valérie Toussaint, Theresa Röper, Katarina Hricova, Irina Delidovich
Epimerization of readily available monosaccharides presents an atom-efficient approach to expand the portfolio of rare monosaccharides. Here, we report tin-organic frameworks (Sn-OF) as a highly selective catalyst for synthesis of rare monosaccharides, such as L-ribose, D-lyxose, D-talose, and L-quinovose, via epimerization reaction. Remarkable selectivity of 67–95 % for the epimerization products was achieved. The maximal yields obtained were 22 % for D-lyxose, 14 % for L-ribose, 15 % for D-talose, and 18 % for L-quinovose. Additionally, a correlation between the structure of the substrate and reaction rate was established, suggesting that the saccharides react in open-chain form, with the cis-orientation of OH-groups facilitating the epimerization. Moreover, it was shown that the catalyst can be reused in a second run. The catalytic epimerization results in a mixture of epimers, from which partial recovery of the substrate can be achieved through crystallization, as demonstrated for L-arabinose, D-galactose, and D-xylose.
易获得的单糖的外聚化提供了一种原子高效的方法来扩大稀有单糖的组合。在这里,我们报道了锡有机框架(Sn-OF)作为一种高选择性催化剂,通过外映异构反应合成稀有单糖,如l -核糖、d -葡萄糖、D-talose和L-quinovose。外聚化产物的选择性达到67 ~ 95%。得到的最大产率为:d -葡萄糖22%,l -核糖14%,D-talose 15%, l -藜麦糖18%。此外,底物的结构与反应速率之间建立了相关性,表明糖以开链形式反应,羟基的顺式取向有利于外映化。结果表明,该催化剂可在二次循环中重复使用。催化外映反应产生外映体混合物,通过结晶可以实现底物的部分回收,如l -阿拉伯糖、d -半乳糖和d -木糖。
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引用次数: 0
Tailoring zeolites for enhanced post-combustion CO2 capture: A critical review 裁剪沸石增强燃烧后二氧化碳捕获:一个关键的审查
Q2 Materials Science Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100451
Ali H. Whaieb , Farah T. Jasim , Amer A. Abdulrahman , Idres M. Khuder , Saba A. Gheni , Islam Md Rizwanul Fattah , Nalan Turkoz Karakullukcu
Fossil combustion mainly contributes to global warming and increases atmospheric CO2 levels, an essential greenhouse gas and environmental risk. The atmospheric CO2 level increased, emphasizing the necessity to restrict the emission while maintaining it out of the carbon cycle. Various porous adsorbents were created as CO2 capture sorbents, but they have been just moderately successful and require upgrading with more efficient porous adsorbents to address global climate issues caused by CO2. Due to their tunable pore sizes, high chemical stability, superior adsorption selectivity, and large surface area, zeolite-based adsorbents are considered promising materials for CO2 capture. Their framework structures allow for molecular sieving, ion exchange, and surface modifications, further enhancing their adsorption efficiency and regeneration capability.
化石燃烧主要导致全球变暖,增加了大气中的二氧化碳含量,而二氧化碳是一种重要的温室气体,具有环境风险。大气中二氧化碳含量的增加强调了限制二氧化碳排放的必要性,同时使其脱离碳循环。人们创造了各种多孔吸附剂作为捕获二氧化碳的吸附剂,但这些吸附剂的效果一般,需要升级为更高效的多孔吸附剂,以解决二氧化碳造成的全球气候问题。沸石类吸附剂具有孔径可调、化学稳定性高、吸附选择性好和表面积大等特点,因此被认为是二氧化碳捕集的理想材料。它们的框架结构允许进行分子筛分、离子交换和表面改性,从而进一步提高了吸附效率和再生能力。
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引用次数: 0
Phyto-fabricated Pd@Ag bimetallic nanocomposites using carica papaya leaf extract: A dual-functional platform for catalysis and antimicrobial defence 植物制造Pd@Ag使用番木瓜叶提取物的双金属纳米复合材料:催化和抗菌防御的双功能平台
Q2 Materials Science Pub Date : 2025-01-01 DOI: 10.1016/j.crgsc.2025.100465
Jayamani T , A. Elakkiya Devi , T. Augustine Arul Prasad , B. Scholastica Mary Vithiya , Lawrance Richardson
This study presents a green synthesis approach for bimetallic palladium–silver (Pd@Ag) nanocomposites using Carica papaya leaf extract, aimed at addressing urgent environmental and biomedical challenges. The synthesized Pd@Ag nanoparticles exhibited remarkable catalytic efficiency in degrading hazardous organic dyes, achieving 82 % and 88 % reduction of Congo Red and Methylene Blue, respectively, within minutes in the presence of NaBH4. This highlights their strong potential in wastewater treatment and environmental detoxification. Furthermore, the Pd@Ag nanocomposites demonstrated broad-spectrum antimicrobial activity, showing significant zones of inhibition against major bacterial pathogens including Escherichia coli and Staphylococcus aureus, as well as antifungal effects against Candida albicans and Aspergillus niger. The dual functionality—efficient catalysis and potent antimicrobial defence—establishes these green-synthesized nanoparticles as promising candidates for sustainable environmental and biomedical applications.
本研究提出了一种利用番木瓜叶提取物绿色合成双金属钯银(Pd@Ag)纳米复合材料的方法,旨在解决紧迫的环境和生物医学挑战。合成的Pd@Ag纳米颗粒在降解有害有机染料方面表现出显著的催化效率,在NaBH4存在的情况下,几分钟内刚果红和亚甲基蓝的还原率分别达到82%和88%。这突出了它们在废水处理和环境解毒方面的巨大潜力。此外,Pd@Ag纳米复合材料显示出广谱抗菌活性,对大肠杆菌和金黄色葡萄球菌等主要细菌病原体具有显著的抑制作用,对白色念珠菌和黑曲霉也有抗真菌作用。双重功能-高效催化和有效的抗菌防御-使这些绿色合成纳米颗粒成为可持续环境和生物医学应用的有希望的候选者。
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Current Research in Green and Sustainable Chemistry
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