g-C_(3)N_(4)/TiO_(2)可见光催化降解磺胺甲恶唑的研究  

Study on catalytic degradation of sulfamethoxazole with g-C_(3)N_(4)/TiO_(2) under visible light irradiation

作　　者：徐昕璇 胡涛[1] 周海东[1] 叶宓煊 许韵嘉 崔锦裕 XU Xinxuan;HU Tao;ZHOU Haidong;YE Mixuan;XU Yunjia;CUI Jinyu(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学环境与建筑学院,上海200093

出　　处：《能源研究与信息》2024年第1期1-10,共10页Energy Research and Information

基　　金：国家自然科学基金(U2240205);上海理工大学科技发展项目(2018KJFZ117)。

摘　　要：以TiO_(2)颗粒和三聚氰胺为原料,采用高温煅烧法制备g-C_(3)N_(4)/TiO_(2)复合光催化材料,研究其对仿生生态系统中磺胺类抗生素的去除效果。利用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)、紫外可见分光光度计(UV-visDRS)对g-C_(3)N_(4)/TiO_(2)进行表征,并研究在可见光条件下g-C_(3)N_(4)/TiO_(2)对溶液中磺胺甲恶唑(SMX)的光催化降解效果。结果表明,g-C_(3)N_(4)/TiO_(2)具有良好的光催化活性,在可见光照射下,当g-C_(3)N_(4)/TiO_(2)投加量为0.2 g·L-1时,对初始质量浓度为200μg·L-1的SMX的去除率可达84.3%。在相同条件下,而g-C_(3)N_(4)和TiO_(2)只能分别去除21.0%和16.0%的SMX,同时在仿生系统中12.37 g·m^(-2)g-C_(3)N_(4)/TiO_(2)可以去除95.35%的SMX。通过质谱分析推测,SMX可能的降解路径分别为S—N键断裂、C—N键断裂、S—C键断裂、SMX的羟基化和SMX上氨基的硝化反应,两种可能的中间产物分别为对氨基苯磺酰胺和3-氨基-5-甲基异恶唑。The composite photocatalytic materials of g-C_(3)N_(4)/TiO_(2) were prepared with high temperature calcination method using TiO_(2) particles and melamine as feedstocks,and the removal of sulfonamide antibiotics by g-C_(3)N_(4)/TiO_(2) in bionic ecosystem was studied.g-C_(3)N_(4)/TiO_(2) was characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR),and ultraviolet-visible spectrophotometer(UV-vis DRS).The photocatalytic degradation of sulfamethoxazole(SMX)in solution by g-C_(3)N_(4)/TiO_(2) under visible light irradiation was studied.Results show that g-C_(3)N_(4)/TiO_(2) has good photocatalytic activity.Under visible light irradiation,the removal rate of SMX with its initial concentration of 200μg∙L^(−1) can reach 84.3%at the dosage of g-C_(3)N_(4)/TiO_(2)=0.2 g∙L^(−1).Under the same conditions,g-C_(3)N_(4) and TiO_(2) can only remove 21.0%and 16.0%of SMX,respectively,while 95.35%of SMX can be removed in the bionic system at the dosage of g-C_(3)N_(4)/TiO_(2)=12.37 g∙m^(−2).The possible degradation pathways of SMX are proposed according to mass spectrometry analysis including S—N bond cleavage,C—N bond cleavage,S—C bond cleavage,hydroxylation of SMX and nitration of amino groups in SMX.The two possible intermediates are p-aminobenzenesulfonamide and 3-amino-5-methylisoxazole.

关 键 词：g-C_(3)N_(4)/TiO_(2) 光降解 仿生生态系统 抗生素 降解机制 

分 类 号：X703.1[环境科学与工程—环境工程]