RGO改性介孔TiO2薄膜光催化同步去除Ni2+和SDBS

李翠霞; 孙会珍; 金海泽; 张幽幽; 杨轩; 李文生

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中国环境科学 ›› 2021, Vol. 41 ›› Issue (4) : 1663-1671.

水污染与控制

RGO改性介孔TiO₂薄膜光催化同步去除Ni²⁺和SDBS

李翠霞, 孙会珍, 金海泽, 张幽幽, 杨轩, 李文生

作者信息 +

Simultaneous removal of Ni²⁺and SDBS by RGO modified mesoporous TiO₂ thin films photocatalytic

LI Cui-xia, SUN Hui-zhen, JIN Hai-ze, ZHANG You-you, YANG Xuan, LI Wen-sheng

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摘要

以钛酸四丁酯（TBT）、天然鳞片石墨为原料，聚乙烯吡咯烷酮（PVP）为介孔模板剂，通过浸渍-提拉法辅助热处理和紫外辐照还原制备介孔RGO-TiO₂薄膜，利用XRD、SEM、BET、UV-Vis DRS、FT-IR等对其结构、形貌及性能进行表征.以Ni²⁺和十二烷基苯磺酸钠（SDBS）为目标污染物，考察了介孔RGO-TiO₂薄膜光催化去除Ni²⁺和SDBS的反应性能，探讨了GO加入量及pH值对其催化性能的影响.在最佳条件下，进一步研究Ni²⁺/SDBS共存体系中Ni²⁺的光催化还原和SDBS的光催化氧化.结果表明：GO的加入量为1.0wt%时，介孔RGO-TiO₂薄膜对单一体系Ni²⁺和SDBS的光催化效率最高，在此条件下，pH=7.5时Ni²⁺还原效率最高，pH=6时SDBS降解效率最高.综合以上实验条件，设定GO加入量为1.0wt%，pH≈6时，Ni²⁺/SDBS共存体系中Ni²⁺和SDBS去除效率均优于Ni²⁺和SDBS单一体系，此时，Ni²⁺还原率为87.9%，SDBS氧化率为95.5%.分析协同光催化机制，TiO₂-SDBS表面复合物在紫外光激发下，SDBS被氧化同时，光生电子及SDBS氧化产物CO₂·^-自由基同步还原Ni²⁺.

Abstract

The mesoporous RGO-TiO₂ thin films were synthesized by dipping-coating assisted heat treatment and ultraviolet lamp irradiation reduction with tetrabutyl titanate (TBT), natural flake graphite as raw materials and polyvinylpyrrolidone (PVP) as mesoporous template. The structure, morphology and properties of samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), specific surface area (BET), UV-Vis diffuse reflectance spectra (UV-Vis DRS) and Fourier transform infrared (FTIR). The reaction property of the removal of Ni²⁺and SDBS by photocatalysis of mesoporous RGO-TiO₂ thin films were evaluated with Ni²⁺ and SDBS as target pollutants. The GO amount and the effects of pH on its catalytic performance were discussed. The photocatalytic reduction of Ni²⁺ and photocatalytic oxidation of SDBS in Ni²⁺/SDBS co-existed system were further studied under the optimum condition. The results showed that the mesoporous RGO-TiO₂ thin film had the highest photocatalytic efficiency for single system Ni²⁺ and SDBS with the content of 1.0wt% GO; The reduction efficiency of Ni²⁺ and the degradation efficiency of SDBS were the highest when the pH values were 7.5 and 6, respectively. In summary, the removal efficiency of Ni²⁺ and SDBS in the co-existed system was better than that of the single system under the additions that the amount of GO was 1.0wt% and pH≈6. The reduction rate of Ni²⁺ was 87.9% and the oxidation rate of SDBS was 95.5%. In this present contribution, the mechanism of synergistic photocatalysis was further explored. It can be concluded that the Ni²⁺ synchronous reduction occured by the photogenerated electrons and the oxidation producted CO₂·^- free radical when the TiO₂-SDBS surface complex was oxidized under the excitation of ultraviolet light.

导出引用

李翠霞, 孙会珍, 金海泽, 张幽幽, 杨轩, 李文生. RGO改性介孔TiO₂薄膜光催化同步去除Ni²⁺和SDBS[J]. 中国环境科学. 2021, 41(4): 1663-1671

LI Cui-xia, SUN Hui-zhen, JIN Hai-ze, ZHANG You-you, YANG Xuan, LI Wen-sheng. Simultaneous removal of Ni²⁺and SDBS by RGO modified mesoporous TiO₂ thin films photocatalytic[J]. China Environmental Science. 2021, 41(4): 1663-1671

中图分类号： X703.5

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