Eco-friendly green synthesis of Ag@Fe bimetallic nanoparticles: Antioxidant, antimicrobial and photocatalytic degradation of bromothymol blue
Eco-friendly green synthesis of Ag@Fe bimetallic nanoparticles: Antioxidant, antimicrobial and photocatalytic degradation of bromothymol blue
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DOI：
10.1016/j.jphotobiol.2018.05.028
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发表时间：
2018-08-01
影响因子：
5.4
通讯作者：
Aazam, Elham Shafik
中科院分区：
文献类型：
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作者：
Al-Asfar, Aisha;Zaheer, Zoya;Aazam, Elham Shafik
以AgNO 3和Fe（NO3）（3）为Ag/Fe源，在椰枣果存在下合成了银-铁纳米粒子（BMNP）。将浸提液加入到Ag+和Fe 3+溶液中后，在室温下几分钟内出现完美的透明稳定的深棕色。为了符合所得颜色的性质，使用紫外-可见光谱、透射电子显微镜（TEM）和能量色散X射线光谱（EDX）技术。在整个UV-可见光区域中不存在表面等离子体共振（SPR）峰表明形成了银（co）（re）-铁（壳）BMNP。将所得的纳米粒子作为催化剂，用于在没有和有阳光的情况下降解溴百里酚蓝（BTB）。研究了过氧化氢、草酸铵、过硫酸铵、苯醌、异丙醇、正丁醇、溴酸钾和碘化钾等电子受体和清除剂存在下的降解动力学。自由基捕获实验表明，活性空穴（h（+））和生成的羟基自由基是H2 O2辅助催化降解过程中的主要物种。测定了提取物和BMNPs的自由基清除、抗氧化和抗菌活性。结果表明，随着提取物用量的增加，1，1-二苯基-2-苦肼基（DPPH）清除活性增强。银-铁配合物对人体病原菌具有良好的体外抗菌活性。
Silver-iron bimetallic nanoparticles (BMNPs) were synthesized by using AgNO3 and Fe(NO3)(3) as an Ag/Fe source in presence of Palm dates fruit. Upon addition of extract to a solution of Ag+ and Fe3+, a prefect transparent stable dark brown color appears with in a few minuets at room temperature. In order to conform the nature of resulting color, UV-visible spectroscopy, transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX) techniques were used. The absence of surface plasmon resonance (SPR) peaks in the entire UV-visible region suggests the formation of silver(co)(re)-iron(shell) BMNPs. The obtained nanoparticles were used as a catalyst for the degradation of bromothymol blue (BTB) in absence and presence of sunlight. The degradation kinetics was studied in presence of electron acceptors and scavengers, such as hydrogen peroxide, ammonium oxalate, ammonium per sulphate, benzoquinone, isopropyl alcohol, n-butanol, potassium bromate and potassium iodide. Radical trapping experiments demonstrates that active holes (h(+)) and generated hydroxy radical are primary species involved in H2O2 assisted catalytic degradation process. The free-radical scavenging, antioxidant and antimicrobial activities were determined for extract and BMNPs. The 1,1-diphenyl-2-picrylhydrazyl (DPPH) scavenging activities were found to increase with increasing the amounts of extract. The silver-iron showed good invitro antibacterial activities against human pathogens.