Zinc oxide photocatalyst was synthesized through a low‐temperature co‐precipitation process using zinc sulfate as precursor for the degradation of Acid Red 57 (AR57) under UV irradiation. The activities of the prepared photocatalyst at different calcination temperatures (400, 500, and 600 °C) were investigated. The synthesized zinc oxides were characterized by different techniques such as X‐ray diffraction, scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, N₂ adsorption–desorption, and pH titration for the determination of the zero‐point charge (pH_ZPC). The efficiency of photocatalytic degradation of ZnO prepared at the calcination temperatures of 400, 500, and 600 °C was 90.03, 77.67, and 72.71%, respectively, after 190 min. The kinetics and scavengers of the reactive species during the degradation were also investigated. It was found that the degradation of AR57 fitted first‐order kinetics and the OH^• radicals were the main species. During irradiation, the formation of OH^• free radicals was ascertained by photoluminescence studies using terephthalic acid as the probe molecule.

中文翻译：

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使用合成的ZnO纳米线有效地光催化降解酸性红57

氧化锌光催化剂是通过低温共沉淀法合成的，使用硫酸锌作为前体在紫外线照射下降解酸性红57（AR57）。研究了所制备的光催化剂在不同煅烧温度（400、500和600°C）下的活性。合成的氧化锌通过X射线衍射，扫描电子显微镜，能量色散X射线光谱法，N ₂吸附-解吸和pH滴定等多种技术进行表征，以确定零点电荷（pH _ZPC）。在190分钟后，在400、500和600℃的煅烧温度下制备的ZnO的光催化降解效率分别为90.03％，77.67和72.71％。还研究了降解过程中反应物种的动力学和清除剂。结果发现，AR57的降解符合一级动力学，OH ^•自由基是主要物质。在辐射过程中，使用对苯二甲酸作为探针分子，通过光致发光研究确定了OH ^•自由基的形成。