Abstract Monometallic ZnO nanoparticles were prepared by hydrolysis of zinc acetate with ammonium hydroxide solution. Bimetallic zinc-silver nanoparticles (ZnO-AgNPs) were prepared using metal displacement galvanic cell reaction in presence of cetyltrimethylammonium bromide (CTAB). The optical and photo-physical properties of both NPs were determined. Surface plasmon resonance (SPR) intensity of ZnO-AgNPs depends on the ratio of metal salt precursors and other experimental conditions. The optical band gap (2.98 eV), agglomeration number (26819.92), and molar concentration (1.14 × 10−4 mol/liter) of ZnO-AgNPs were determined. Langmuir adsorption monolayer, Freundlich, intraparticles diffusion and multilayer adsorption isotherms used for the determination of maximum adsorption efficiency and adsorption isotherm parameters to the removal of safranin dye from an aqueous solution. The kinetics of safranin removal has also been discussed with pseudo-first order, pseudo-second order, intraparticle diffusion and multilayer kinetic models. The antibacterial and antifungal activities of ZnO, Ag and ZnO-AgNPs were determined against human pathogens using growth kinetic and disk diffusion methods. The concentrations of ZnO-AgNPs have significant effect on the bacterial growth kinetics. The death rate constants increase with increasing the NPs concentrations. It has been found that the ZnO-AgNPs hold higher microbial activities than that of monometallic counterpart, ZnO and AgNPs. Mechanism of bacterial growth and death was discussed.

中文翻译：

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锌/银二元纳米粒子的制备及其增强的微生物和吸附性能

摘要 采用氢氧化铵溶液水解醋酸锌制备单金属氧化锌纳米粒子。在十六烷基三甲基溴化铵 (CTAB) 存在下，使用金属置换原电池反应制备双金属锌-银纳米粒子 (ZnO-AgNPs)。确定了两种纳米颗粒的光学和光物理特性。ZnO-AgNPs 的表面等离子体共振 (SPR) 强度取决于金属盐前体的比例和其他实验条件。测定了 ZnO-AgNPs 的光学带隙 (2.98 eV)、团聚数 (26819.92) 和摩尔浓度 (1.14 × 10-4 mol/L)。Langmuir 吸附单层，Freundlich，颗粒内扩散和多层吸附等温线用于确定从水溶液中去除番红染料的最大吸附效率和吸附等温线参数。还使用伪一级、伪二级、粒子内扩散和多层动力学模型讨论了番红去除的动力学。使用生长动力学和圆盘扩散方法测定了 ZnO、Ag 和 ZnO-AgNPs 对人类病原体的抗菌和抗真菌活性。ZnO-AgNPs 的浓度对细菌生长动力学有显着影响。死亡率常数随着 NPs 浓度的增加而增加。已经发现，ZnO-AgNPs 比单金属对应物 ZnO 和 AgNPs 具有更高的微生物活性。