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Ag@AgCl/CA 的合成及对土霉素的可见光催化降解。

Synthesis of Ag@AgCl/CA and Visible-Light Photocatalytic Degradation of Oxtetracycline.

机构信息

Jiangsu Vocational College of Agriculture and Forestry, Jiangsu, Jurong 212400, Singapore.

Anhui Xuchen Biotechnology Co., Ltd, Anhui, Bengbu 233000, China.

出版信息

Comput Intell Neurosci. 2022 Aug 21;2022:8466272. doi: 10.1155/2022/8466272. eCollection 2022.

DOI:10.1155/2022/8466272
PMID:36045977
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9420572/
Abstract

Chemical coupling, in-situ deposition of supported AgCl, and photoreduction were used to create Ag@AgCl/CA. The morphology, structure, and surface area of the prepared Ag@AgCl/CA were characterized by SEM, TEM, FT-IR, and BET. The photogenerated electron transport efficiency and visible light absorption were analyzed by photocurrent and electrochemical impedance spectroscopy (EIS), respectively. The surface electrical properties and degradation stability were evaluated by zeta potential measurement and cyclic catalytic degradation experiments, and the photocatalytic mechanism was proposed in detail based on the ESR test and trapping experiment. The results showed that the cluster of Ag@AgCl nanoparticles were distributed on the CA crosslinking structure. The prepared Ag@ AgCl/CA photocatalytic material has a high Zeta potential, stable photocurrent, and small photogenerated electron transfer resistance. It has good adsorption and photocatalytic degradation stability for OTC. The material has a relatively strong absorption in the visible light range. Temperature and initial pH had significant effects on the degradation of OTC by photocatalytic materials. The photocatalytic degradation rate was the highest at 40°C and pH6, and the photocatalytic degradation process conformed to the quasi-first-order reaction kinetics. Holes (h) and superoxide radicals (·O－) were the main active species for the degradation of OTC.

摘要

化学偶联、原位沉积负载型 AgCl 和光还原被用于制备 Ag@AgCl/CA。采用 SEM、TEM、FT-IR 和 BET 对制备的 Ag@AgCl/CA 的形貌、结构和比表面积进行了表征。通过光电流和电化学阻抗谱（EIS）分别分析了光生电子输运效率和可见光吸收。通过zeta 电位测量和循环催化降解实验评估了表面电性能和降解稳定性，并根据 ESR 测试和捕获实验提出了详细的光催化机理。结果表明，Ag@AgCl 纳米粒子簇分布在 CA 交联结构上。所制备的 Ag@AgCl/CA 光催化材料具有高 Zeta 电位、稳定的光电流和较小的光生电子转移电阻，对 OTC 具有良好的吸附和光催化降解稳定性。该材料在可见光范围内具有较强的吸收。温度和初始 pH 对光催化材料降解 OTC 有显著影响，在 40°C 和 pH6 时降解速率最高，光催化降解过程符合准一级反应动力学。空穴（h）和超氧自由基（·O－）是降解 OTC 的主要活性物质。

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