Abstract

The results of studies on obtaining and environmental application of silver NPs in presents carboxymethyl cellulose (CMC) as capping agent and Ag₀(NPs)/TiO₂ nanocomposite synthesized by plasma–liquid discharge are presented in the paper. The influence of reagents ratio, duration of plasma discharge treatment on the synthesis of nanoparticles and their characteristics (average diameter and index polydispersity) are investigated. The UV-Vis spectra showed the absorbance at wavelengths of 405–420 nm. The DLS analysis in complex with SEM and TEM microscope images showed that the shape of Ag NPs was spherical with particle size up to 20–30 nm. Investigation of the kinetics of nanoparticle dispersion formation showed that the reaction was a pseudo-first order reaction and the reaction rate constant was 0.58 min⁻¹. It has been established that СМС is the only stabilizer in the plasma chemical formation of nanoparticles. Silver nanoparticles have been deposited on commercial powder TiO₂ by a method involving plasma discharge. Composite TiO₂/Ag NPs has structure like the core–shell constructed by the TiO₂ sphere cores and Ag NPs 15–25 nm shell size of (EDS and SEM). The results indicate that the photocatalytic efficiency for degradation of pharmaceutical drag (tetracycline antibiotic) of TiO₂/Ag is higher than that of pure TiO₂. A possible pathway of photodegradation TC was also proposed.

摘要

_{以羧甲基纤维素(CMC)为封端剂和Ag 0} (NPs)/TiO ₂制备银纳米粒子及其环境应用的研究结果本文介绍了通过等离子体-液体放电合成的纳米复合材料。研究了试剂配比、等离子体放电处理持续时间对纳米粒子合成及其特性（平均直径和指数多分散性）的影响。紫外-可见光谱显示 405–420 nm 波长处的吸光度。结合 SEM 和 TEM 显微镜图像的 DLS 分析表明，Ag NPs 的形状为球形，粒径可达 20-30 nm。纳米粒子分散体形成的动力学研究表明该反应是准一级反应，反应速率常数为 0.58 min ^-1. 已经确定，СМС 是等离子体化学形成纳米粒子的唯一稳定剂。已经通过涉及等离子体放电的方法将银纳米颗粒沉积在商业粉末TiO _2上。复合 TiO ₂ /Ag NPs 具有类似于由 TiO ₂球核和 Ag NPs 15-25 nm 壳尺寸（EDS 和 SEM）构成的核壳结构。结果表明，TiO ₂ /Ag 降解药物药物（四环素类抗生素）的光催化效率高于纯TiO ₂。还提出了光降解 TC 的可能途径。