二氧化钛纳米管阵列光催化降解磺胺产物与机理研究  

Study on the photocatalytic degradation of sulfonamide products and its mechanism using titanium dioxide nanotube arrays

作　　者：张芬贞 苗世玉 刘扬 简生龙 王振吉 李长忠 ZHANG Fenzhen;MIAO Shiyu;LIU Yang;JIAN Shenglong;WANG Zhenji;LI Changzhong(College of Eco-environmental Engineering,Xining 810016,China;Fishery Technology Promotion Center of Qinghai Province,Xining 810012,China)

机构地区：[1]青海大学生态环境工程学院,青海西宁810016 [2]青海省渔业技术推广中心,青海西宁810012

出　　处：《青海大学学报》2023年第4期1-8,共8页Journal of Qinghai University

基　　金：青海省科学技术厅项目(2019-NK-A2)。

摘　　要：抗生素对水体环境的污染日益严重,磺胺作为一种典型抗生素,其降解研究引起了广大研究者的关注.文中采用阳极氧化的方法制备二氧化钛纳米管阵列,以磺胺为目标污染物,分析光照、溶液初始pH、初始质量浓度、溶液中腐殖酸和乙酸钠等对二氧化钛纳米管阵列光催化降解水中磺胺的影响,并探讨了降解产物与降解机理.结果表明:(1)光照是二氧化钛纳米管阵列光催化降解磺胺的主要因素;(2)pH影响二氧化钛纳米管阵列降解磺胺的效率,在中性条件下磺胺的降解效率最高;(3)随着磺胺溶液浓度的增加,降解效率逐渐变小;(4)水环境中腐殖酸和乙酸钠对光催化降解有较明显的影响;(5)二氧化钛纳米管阵列光催化降解磺胺过程中生成了7种主要中间产物,降解路径包括水解反应、硝基化反应、氨基羟基化反应和苯环羟基化反应;h+是二氧化钛纳米管阵列光催化降解过程中的主要活性物.综上,二氧化钛纳米管阵列光催化氧化技术是一种有效去除养殖废水中磺胺抗生素的处理方式.The pollution of water by antibiotics has become increasingly serious in recent years.Sulfonamide,a typical antibiotic,has attracted the attention of researchers in its degradation study.Taking sulfonamide as the target pollutant,titanium dioxide nanotube arrays are prepared using anodic oxidation method.The effects of light,initial pH of the solution,initial mass concentration,humic acid and sodium acetate in the solution on the photocatalytic degradation of sulfonamide are analyzed using titanium dioxide nanotube arrays.The degradation products and mechanisms are analyzed as well.The results show that:(1)Light is the main factor affecting the photocatalytic degradation of sulfonamide using titanium dioxide nanotube arrays;(2)pH will affect the efficiency of titanium dioxide nanotube arrays in degrading sulfanilamide,and the degradation efficiency is the highest under neutral conditions;(3)The degradation efficiency gradually decreases as the concentration of sulfonamide solution increases;(4)Humic acid and sodium acetate in water have a significant impact on the photocatalytic degradation;(5)Seven main intermediate products are generated during the process of photocatalytic degradation.The degradation pathways include hydrolysis reaction,nitration reaction,amino hydroxylation reaction and benzene ring hydroxylation reaction;h^(+)is the main active substance in the process of photocatalytic degradation.In summary,photocatalytic oxidation technology using titanium dioxide nanotube arrays is an effective way to remove sulfonamide antibiotics from aquaculture wastewater.

关 键 词：磺胺 二氧化钛纳米管阵列 光催化 养殖废水 降解路径 

分 类 号：X703[环境科学与工程—环境工程]