摘要
为了在可见光条件下有效光解去除抗生素,制备了石墨烯-二氧化钛复合物(Graphene-TiO2,G-TiO2),考察了不同因素对G-TiO2的光解作用的影响以及催化剂的重复利用效果。研究结果表明,G-TiO2在可见光下对泰乐菌素(tylosin,TYL)有一定的去除效果,光解速率随溶液pH的增加先增加后减小,随着TYL初始浓度的增加而减小。石墨烯含量为1%时光解效果最好,且催化剂有较好的重复利用性。初步分析,G-TiO2对TYL的去除包括吸附和光解2个过程,且光生空穴及·OH自由基反应可能是TYL光解的主要机制。本研究表明,G-TiO2是一种理想材料,可用于去除水中的抗生素微污染。
In order to photodegrade and remove antibiotic in water under visible light,graphene-titanium dioxide composite（G-TiO2） was prepared.Effects of factors on photodegradation of tylosin and reuse of catalyst were investigated.The results showed that the tylosin was removed when using G-TiO2 in visible light.The photodegradation rate increased firstly and then decreased when pH value continued to increase.Moreover,increasing concentration of tylosin reduced the photodegradation rate.Especially,graphene content of 1% showed the best photodegradation performance and good reusability of the catalyst.Removal of tylosin by G-TiO2 might include adsorption and photodegradation processes,additionally electron-hole effect and reaction by ·OH might be the domain mechanisms of photodegradation of tylosin under visible light conditions.The results showed that G-TiO2 is an effective material to remove trace tylosin in water.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第7期3223-3228,共6页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(41072268
21277051)
广州市珠江科技新星项目
广东省普通高校水土环境毒害性污染物防治与生物修复重点实验室开放基金资助项目
关键词
TYL
光解
石墨烯-二氧化钛复合物
tylosin
photodegradation
graphene-titanium dioxide composite
