PDS协同g-C_3N_4可见光催化降解水体中布洛芬  

PHOTOCATALYTIC DEGRADATION OF IBUPROFEN IN WATER BY SYNERGISM OF PDS AND g-C_3N_4

作　　者：邓智瀚 刘国[1,2] 谢志豪[1,2] 余雯雯 辜昊[1,2] DENG Zhi-han;LIU Guo;XIE Zhi-hao;YU Wen-wen;GU Hao(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection , Chengdu University of Technology , Chengdu 610059 , China;State Environmental Protection Key Laboralary of Synergetic Control and Joint Remedication for Soil & Water Pollution, Chengdu University of Technology, Chengdu 610059 , China)

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),成都610059 [2]国家环境保护水土污染协同控制与联合修复重点实验室(成都理工大学),成都610059

出　　处：《环境工程》2019年第3期67-74,共8页Environmental Engineering

摘　　要：以尿素为主要原料,采用热聚合法制备光催化剂g-C_3N_4(石墨相碳化氮),对其进行X射线衍射(XRD)、扫描电子显微镜(SEM)、傅里叶红外光谱仪分析仪(FT-IR)表征。通过过硫酸钾(PDS)协同g-C_3N_4可见光催化降解布洛芬实验,探究各种因素对布洛芬光解效率的影响;通过淬灭实验、荧光光谱(PL)测试以及降解中间产物分析,推导了PDS协同g-C_3N_4光催化降解布洛芬的反应机理。结果表明:g-C_3N_4是由片状薄层堆积而成的,在g-C_3N_4投加量为1. 0 g/L,布洛芬初始浓度为10 mg/L,PDS的最佳添加量为3. 334 mmol/L,pH为3时,布洛芬的光催化降解效果最佳,光反应4 h内布洛芬的降解率达到90%以上。PDS的加入显著提升了g-C_3N_4对布洛芬的光催化降解率,其中h^+在光解过程中起主导作用,加入PDS不仅会生成能光解布洛芬的SO_4^-·,还可以降低催化剂g-C_3N_4光生空穴和电子的复合程度,提高h^+的利用率。布洛芬降解过程生成一系列小分子中间产物,最终生成无机盐和水。The photocatalyst g-C3N4( graphite nitrogen carbide) was prepared by thermal polymerization with urea as the main raw material. The photocatalyst was characterized by X-ray diffraction( XRD),scanning electron microscopy( SEM) and Fourier transform infrared spectrometer( FT-IR). The photocatalytic degradation of ibuprofen by potassium persulfate( PDS)and g-C3N4 under visible light irradiation was studied to explore the effect of various factors on the photolysis efficiency of ibuprofen. The reaction mechanism of photocatalytic degradation of ibuprofen by PDS and g-C3N4 was deduced through quenching test,fluorescence spectrum( PL) test and intermediate degradation product analysis. The results showed that g-C3N4 was stacked by sheet-like thin layers. When the dosage of g-C3N4 was 1. 0 g/L,the initial concentration of ibuprofen was 10 mg/L,the optimum dosage of PDS was 3. 334 mmol/L and pH was 3,the photocatalytic degradation rate of ibuprofen was the optimum,over 90% within 4 hours of photoreaction. The addition of PDS significantly increased the photocatalytic degradation rate of ibuprofen by g-C3N4,in which H+played a dominant role. The addition of PDS not only resulted in the formation of SO4^-·,which could lead to photolysis of ibuprofen,but also reduced the degree of photogenerated holes and electron recombination of g-C3N4,and increased the utilization rate of H+. The degradation process of ibuprofen produced a series of small molecule intermediates,which eventually formed inorganic salts and water.

关 键 词：过硫酸钾 石墨相碳化氮 光催化降解 布洛芬 

分 类 号：X703[环境科学与工程—环境工程]