Abstract:

The traditional Fenton reaction has limited its application due to the generation of large amounts of metal-rich sludge during wastewater treatment. In this study, a low-cost, easy-to-recycle and green porous geopolymer microsphere (GM) was obtained by suspension curing method, and the copper-loaded geopolymer microsphere (Cu-GM) was prepared as a carrier by impregnation method as a catalyst for Fenton-like reaction, which catalyzed the degradation of bisphenol S (BPS) in water with H₂O₂. A series of characterization results, such as SEM, XRD, BET and XPS, showed that that Cu^+/2+ was stably immobilized on the GM surface. The effects of Cu-GM dosage, H₂O₂ dosage, BPS concentration and initial pH of the solution on the catalytic degradation were further investigated. The results indicated that under the optimized conditions, the removal of BPS by Cu-GM could reach 99.3% within 480min, and the catalytic degradation process conformed to the first-order reaction kinetics. The free radical burst experiment revealed that ·OH and ¹O₂ were the main active substances in the catalytic degradation process. The bad-cycle experiments showed that Cu-GM had good reusability and great potential for application in removing organic pollutants in water.

Key words: geopolymer microspheres, copper-based Fenton-like, bisphenol S, catalytic degradation, degradation mechanism

摘要：

传统的芬顿反应因在废水处理过程中会产生大量富含金属污泥而应用受限。本研究采用悬浮固化法得到了一种低成本、易回收、绿色的多孔地质聚合物微球（GM），将其作为载体通过浸渍法制备了载铜地质聚合物微球（Cu-GM），作为类芬顿反应催化剂，催化H₂O₂降解水中的双酚S（BPS）。SEM、XRD、BET和XPS等一系列表征结果表明，Cu^+/2+被稳定固定在GM表面。进一步探究了Cu-GM用量、H₂O₂用量、BPS浓度和溶液初始pH对催化降解的影响。结果表明，在优化条件下，Cu-GM在480min内对BPS的去除率可达99.3%，催化降解过程符合一级反应动力学。通过自由基淬灭实验发现，在催化降解过程中·OH和¹O₂是主要活性物质。循环实验表明Cu-GM具有良好的重复利用性，在去除水中有机污染物方面有着极大的应用潜力。

关键词: 地质聚合物微球, 铜基类芬顿, 双酚S, 催化降解, 降解机理