Metal nanocomposite as photocatalyst plays a major role for treating organic and inorganic pollutants present in industrial effluent through photocatalytic process. In this study, the co-precipitation method has been demonstrated in the preparation of ZnO/SnO2nanocomposite. The catalytic behaviour of the ZnO/SnO2 is studied against Quinalphos pesticide under the illumination of direct sunlight at neutral pH. The photocatalytic performance of ZnO/SnO2nanocomposite is examined by loading 2 mg/L of the catalyst in 30 ppm of the Quinalphos solution to achieve 98 % degradation in thirty minutes. The structural and chemical compositional analysis of the prepared ZnO/SnO2nanocomposite has been characterised by X-ray diffraction pattern and FT-IR spectrum respectively. The morphological analysis of ZnO/SnO2 nanocomposite is done by scanning electron microscope (SEM). The UV-Visible absorption spectroscopy is used to examine the optical properties of ZnO/SnO2nanocomposite together with the photo degradation process of Quinalphos pesticide. The presence of oxygen vacancies and the fluorescence property of the prepared nanocomposite are detected by fluorimetric analysis. Degradation efficiency is estimated by COD and TOC measurements. Moreover, the stability and quality of the prepared ZnO/SnO2nanocomposite could be separated easily and utilised for multiple cycles with no change in its activity.

中文翻译：

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可见光下耦合ZnO/SnO2纳米复合材料对水溶液中喹诺磷降解的增强光催化活性

金属纳米复合材料作为光催化剂在通过光催化过程处理工业废水中存在的有机和无机污染物方面发挥着重要作用。在这项研究中，共沉淀法已被证明可用于制备 ZnO/SnO2 纳米复合材料。在中性 pH 值直射阳光照射下，研究了 ZnO/SnO2 对 Quinalphos 农药的催化行为。ZnO/SnO2 纳米复合材料的光催化性能通过在 30 ppm 的 Quinalphos 溶液中负载 2 mg/L 催化剂以在 30 分钟内实现 98% 的降解来检验。制备的ZnO/SnO2纳米复合材料的结构和化学成分分析分别通过X射线衍射图和FT-IR光谱进行了表征。ZnO/SnO2纳米复合材料的形态分析是通过扫描电子显微镜（SEM）进行的。紫外-可见吸收光谱用于研究 ZnO/SnO2 纳米复合材料的光学性质以及喹诺磷农药的光降解过程。通过荧光分析检测氧空位的存在和制备的纳米复合材料的荧光性质。降解效率通过 COD 和 TOC 测量来估算。此外，所制备的 ZnO/SnO2 纳米复合材料的稳定性和质量可以很容易地分离并用于多个循环而其活性没有变化。通过荧光分析检测氧空位的存在和制备的纳米复合材料的荧光性质。降解效率通过 COD 和 TOC 测量来估算。此外，所制备的 ZnO/SnO2 纳米复合材料的稳定性和质量可以很容易地分离并用于多个循环而其活性没有变化。通过荧光分析检测氧空位的存在和制备的纳米复合材料的荧光性质。降解效率通过 COD 和 TOC 测量来估算。此外，所制备的 ZnO/SnO2 纳米复合材料的稳定性和质量可以很容易地分离并用于多个循环而其活性没有变化。