摘要
采用溶胶-凝胶法和浸渍法制备了磁载CuO-TiO2/SiO2/Fe3O4复合光催化剂。以双酚A(BPA)为降解物进行光催化实验,并根据BPA去除率确定最佳的铜掺杂量。借助扫描电子显微镜(SEM)、X射线衍射仪(XRD)和傅立叶变换红外光谱(FTIR)对制备的Cu O-TiO2/SiO2/Fe3O4样品进行表征。探讨了催化剂、盐、甲苯浓度和初始pH值等因素对BPA降解率的影响,结果表明,当初始pH值=12.6时,催化剂质量浓度为6 g/L时,对BPA降解率最高,盐与甲苯浓度对BPA降解影响不显著。此外,通过光催化活性物种淬灭实验表明,羟基自由基和超氧化物自由基在反应体系中起主要作用,揭示了BPA去除机理。
In this study, a CuO-TiO2/SiO2/Fe3O4 magnetic photocatalyst was prepared through the sol-gel and impregnation method. The photocatalyst was used to remove high levels of bisphenol A(BPA) in epoxy resin wastewater, and the optimum amount of copper dopant was determined from the rate of BPA removal. The as-prepared CuO-TiO2/SiO2/Fe3O4 sample was characterized using scanning electron microscopy, X-ray diffraction measurement, and Fourier transform infrared spectroscopy. Then, the effects of catalyst, salt, toluene concentration and initial pH on the degradation rate of BPA were investigated. The results reveal that When p H was 12.6 and the catalyst concentration is 6 g/L, the degradation rate of BPA is the highest, and the concentration of salt and toluene has no significant effect on BPA degradation. In addition,experiments on quenching by different scavengers showed that hydroxyl radical and superoxide radical play the main roles in the reaction system and revealed the mechanism of BPA removal.
作者
杨萌萌
郑晓英
曹素兰
邵晓瑶
朱灵华
徐智
张远
YANG Meng-meng;ZHENG Xiao-ying;CAO Su-lan;SHAO Xiao-yao;ZHU Ling-hua;XU Zhi;ZHANG Yuan(Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes,Ministry of Education,College of Environmental,Hohai University,Nanjing 210099,China;Taizhou Housing and Urban-Rural Development Bureau,Taizhou 225300,China)
出处
《环境科技》
2020年第5期1-7,共7页
Environmental Science and Technology
基金
国家自然科学基金项目(51678214)
国家重点研发计划“水资源高效开发利用”专项(2016YFC0400804)
江苏高校优势学科建设工程资助项目(PAPD)。
关键词
磁性催化剂
双酚A(BPA)
光催化活性
光催化机理
Magnetic photocatalyst
Bisphenol A(BPA)
Photocatalytic activity
Photocatalytic mechanism
