期刊名称：Journal of Environmental Science and Technology
印刷版ISSN：1994-7887
电子版ISSN：2077-2181
出版年度：2020
卷号：13
期号：3
页码：124-130
DOI：10.3923/jest.2020.124.130
出版社：Asian Network for Scientific Information
摘要：Background and Objective: Laundry wastewater containing high concentration of Linear Alkyl-benzene Sulfonate (LAS) can create environmental and health problems. This research aimed the elimination of LAS in the laundry wastewater by visible–light driven degradation over Ag-doped TiO2 photocatalyst. Materials and Methods: Doping TiO2 with Ag was performed by photodeposition of AgNO3 under UV-light irradiation for 24 h. The doped photocatalysts were characterized by XRD, FTIR, DRUV and TEM methods. The photodegradation of LAS in the laundry wastewater was conducted by batch technique, over TiO2-Ag under visible light for different Ag content, time and photocatalyst dose. Results: The characterization data assigned that Ag has been successfully doped in TiO2 with various amount proportional to the AgNO3 concentrations. The Ag-doping has decreased the Energy gap (Eg) that shifted the absorption into visible region. The Eg decrease was influenced by the amount of Ag-doped and the highest decrease was shown by TiO2-Ag prepared from 150×102 M of AgNO3 giving Ag-doped as 131 mg g1. The concentration of LAS as much 110.05 mg L1 in the laundry wastewater could be reduced through photo degradation over TiO2-Ag driven by visible light. The TiO2-Ag demonstrated stronger photo activity compared to un-doped one. The photodegradation efficiency was controlled by the amount of Ag-doped, the irradiation time and the photocatalyst dose. Conclusion: Ag particles have been successfully doped in TiO2 and the doped photocatalyst showed higher activity in the LAS removal under visible and UV lights, compared to the un-doped one. The highest LAS photodegradation (78%) could be obtained by using TiO2-Ag containing 131 mg Ag/g, 24 h and 50 mg/100 mL of the photocatalyst dose.
关键词：Alkyl-benzene sulfonate; laundry wastewater; Ag dopant; doped photocatalyst; visible light
