Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, 16424, Indonesia.
Center for Technology of Nuclear Industry Materials-National Energy Agency Indonesia, BATAN, Puspitek Area, Serpong, 15314, South Tangerang, Indonesia.
Chemosphere. 2022 Oct;304:135125. doi: 10.1016/j.chemosphere.2022.135125. Epub 2022 May 25.
Malachite green (MG) contributes to water contamination because its accumulation adversely impacts aquatic systems. For the first time, we prepare a high photoresponse of ZnO/SmMnO heterojunction via a high-speed stirring method at the nonpolar-polar interface assisted by Alstonia scholaris leaves extract (ASLE) as natural hydrolyzing and stabilizing agents. The heterojunction formation boosts the photocatalytic activity of ZnO up to 91.74% under visible light irradiation. Photoluminescence analysis confirmed that modification with SmMnO increases the separation of photogenerated charges and plummets the recombination rates of electron-holes, which induces high photodegradation of MG. With 3 mg of catalyst, the %TOC removal efficiency for MG degradation over ZnO/SmMnO was found to be 53.09%, which is higher than that over ZnO. The kinetics model for the photocatalytic reaction was a pseudo-first-order with excellent stability in four consecutive cycles with no structural change. The radical trapping experiment suggests that h was the major species in the MG photodegradation reaction. Additionally, morphology and elemental analyses clearly present the formation of ZnO/SmMnO heterojunction without any impurities. The current research demonstrates a simple and advanced technique to design heterojunction photocatalyst at the interface of hexane-water.
孔雀石绿（MG）会造成水污染，因为其积累会对水生系统产生不利影响。我们首次通过高速搅拌法在非极性-极性界面上制备了具有高光响应的 ZnO/SmMnO 异质结，该方法由夹竹桃叶提取物（ASLE）作为天然水解和稳定剂辅助。异质结的形成将 ZnO 的光催化活性提高到可见光照射下的 91.74%。光致发光分析证实，SmMnO 的修饰增加了光生电荷的分离，并降低了电子-空穴的复合速率，从而导致 MG 的高降解。在 3 mg 催化剂的条件下，ZnO/SmMnO 对 MG 降解的总有机碳去除效率为 53.09%，高于 ZnO。光催化反应的动力学模型是准一级，在四个连续循环中具有良好的稳定性，且结构没有变化。自由基捕获实验表明，在 MG 光降解反应中，h+是主要的物种。此外，形貌和元素分析清楚地表明，在正己烷-水界面上形成了 ZnO/SmMnO 异质结，没有任何杂质。本研究展示了一种在正己烷-水界面设计异质结光催化剂的简单而先进的技术。
