Photodegradation of soluble microbial products(SMPs) from membrane bioreactor by GO-COOH/TiO2/Ag

作     者：Shuyan Yu Xia Huang Shuyan Yu;Xia Huang

作者机构：State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2020年第32卷第2期

页      面：292-300页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 

基　　金：the financial support received from China Postdoctoral Science Foundation Funded Project(No.2018M641387). 

主　　题：Soluble microbial products (SMPs) 2,6-Di-tert-butylphenol (2,6-DTBP) Carboxylated graphene oxide/titanium dioxide/silver (GO-COOH/TiO2/Ag) nanocomposite Photocatalysis technology 

摘      要：This study aimed to explore a new degradation method-photocatalysis technology to polish membrane bioreactor(MBR) effluent, using 2,6-di-tert-butylphenol(2,6-DTBP) as a model soluble microbial product(SMP).2,6-DTBP is one of the predominant SMPs in MBR effluent, which is refractory and difficult to biodegrade.This study developed a novel carboxylated graphene oxide/titanium dioxide/silver(GO-COOH/TiO2/Ag) nanocomposite to photodegrade 2,6-DTBP.GO-COOH/TiO2/Ag was successfully synthesized, using L-cysteine as the linker bonding TiO2/Ag to GO-COOH.The structural, morphological and optical properties of the GO-COOH/TiO2/Ag nanocomposite were characterized using various techniques.Owing to synergistic effects, the GO-COOH/TiO2/Ag nanocomposite exhibited enhanced photocatalytic degradation performance under solar light irradiation when compared to TiO2, Ag and GO-COOH.To remove 25 mg/L 2,6-DTBP, the reaction time for GOCOOH/TiO2/Ag was only 30 min, faster than the 90 min required for pure TiO2 or Ag.In addition, the 200 mg/L GO-COOH/TiO2/Ag nanocomposite aqueous solution showed the best performance under solar light, with 99% removal of 2,6-DTBP.This enhanced capability is likely due to the surface plasmon resonance(SPR) effect contributed by Ag nanoparticles(NPs) doped onto the TiO2.In addition, GO-COOH had a high effective surface area, which assisted in degrading the 2,6-DTBP through improved adsorption.The stability study showed that the photocatalytic activity of the GO-COOH/TiO2/Ag was stable enough for recycling multiple times.The effective degradation performance and excellent stability demonstrates that the GO-COOH/TiO2/Ag nanocomposite can be a promising photocatalyst in the field of effluent SMP photodegradation, which solves the problem of the difficult biodegradation of highly toxic 2,6-DTBP.