Abstract
In order to improve the treatment efficiency of printing and dyeing wastewater, the carbon nanotubes-silver-modified-titanium dioxide (CNTs-Ag-TiO2, CAT) ternary composite was prepared by a mechanical mixing method. It was found that the morphology of the prepared CAT sample was uniformly coated with strips of CNTs, speckled Ag, and lumpy TiO2. The (002) crystal plane of CNTs, the (101) crystal plane of TiO2, and the (111) crystal plane of Ag were observed, which possessed functional groups such as Ti-OH and Ti-O-C, indicating that the prepared CAT sample had photocatalytic reaction sites. The visible light utilization of titanium dioxide can be improved. The treatment effect of different proportions of CNTs-Ag-TiO2 on Congo red wastewater was tested, and the results showed that the optimum degradation effect of Congo red wastewater was CNTs: Ag = 10:1, and the doped amount of CNTs/Ag was 15%, and the removal rate of Congo red wastewater could reach 100% within 140 min. The excellent removal effect of CAT ternary composite on Congo red wastewater provided a new idea and way for the modification of TiO2 and its composites for the potential of organic dyes degradation.
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We declare that the data supporting the findings of this study are available within the article.
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This work was supported by Shandong Provincial Natural Science Foundation (ZR2020QC048 and ZR2019BB040), Postdoctoral Science Foundation of China (2021M691850), and the National Natural Science Foundation of China (No. 31901188 and No. 31672314).
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Y. Y., K. L., and J.C. conceived and designed the experiments. The experiments were performed by Y. Y., K. L., F. S., Y. L., and J. C. Data was analyzed by Y. Y., K. L., F. S., Y. L., and J. C. The paper was written by Y. Y., K. L., and J.C.
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Yang, Y., Liu, K., Sun, F. et al. Enhanced performance of photocatalytic treatment of Congo red wastewater by CNTs-Ag-modified TiO2 under visible light. Environ Sci Pollut Res 29, 15516–15525 (2022). https://doi.org/10.1007/s11356-021-16734-w
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DOI: https://doi.org/10.1007/s11356-021-16734-w