ABSTRACT

This paper reports a novel magnetic composite photocatalyst ZnO/Bi₂₄O₃₁Br₁₀@SrFe₁₂O₁₉ (ZBBSF) fabricated via a hydrothermal method. The structural characteristics of ZBBSF and the probable photocatalytic mechanism for rhodamine-B (RhB) degradation under visible light were investigated. Application of ZBBSF in a primary treatment of landfill leachate was also evaluated. Crystal and microscopic structure analyses verified that SrFe₁₂O₁₉ successfully compounded with the ZnO/Bi₂₄O₃₁Br₁₀ composite (ZBB). The as-prepared ZBBSF composite displayed higher photocatalytic activity than ZBB for RhB degradation, and the decomposition level exceeded 95% after 30 min under visible light. Capturing experiments and electron spin resonance (ESR) analysis prove that •O₂ ^– and •OH are the dominant activated radicals in RhB degradation. ZBBSF exhibited considerable stability after five cycles. Furthermore, ZBBSF exhibited a notable decolourisation effect on landfill leachate, reaching 56% in 250 min under visible light. These findings suggest that ZBBSF is a new composite photocatalyst with high efficiency and recyclability for organic wastewater disposal.

摘要

本文报道了一种通过水热法制备的新型磁性复合光催化剂 ZnO/Bi ₂₄ O ₃₁ Br ₁₀ @SrFe ₁₂ O ₁₉ (ZBBSF)。研究了ZBBSF的结构特征和可见光下罗丹明-B（RhB）降解的可能光催化机理。还评估了 ZBBSF 在垃圾渗滤液初级处理中的应用。晶体和微观结构分析证实SrFe ₁₂ O ₁₉与ZnO/Bi ₂₄ O ₃₁ Br _{10成功复合}复合材料（ZBB）。所制备的ZBBSF复合材料对RhB降解的光催化活性高于ZBB，在可见光下30分钟后分解水平超过95%。捕获实验和电子自旋共振(ESR) 分析证明•O ₂ ^-和•OH 是RhB 降解中的主要活化自由基。ZBBSF 在五个循环后表现出相当大的稳定性。此外，ZBBSF 对垃圾渗滤液的脱色效果显着，在可见光下 250 分钟内达到 56%。这些研究结果表明，ZBBSF 是一种新型复合光催化剂，具有高效和可回收的有机废水处理能力。