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Construction of bimetallic co-doped ordered mesoporous MxCey/(TiO2)z@SiO2 aerogel composite material and its photocatalytic performance under visible light

  • Original Paper: Sol-gel, hybrids and solution chemistries
  • Published:
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Abstract

Dye (such as Rhodamine B) is an organic pollutant, which has become a serious environmental pollution problem due to its pollution of soil, groundwater, aquatic ecosystem and biological health. In this study, bimetallic co-doped ordered mesoporous MxCey/(TiO2)z@SiO2 aerogel composites were prepared by sol-gel combined with atmospheric pressure drying method. The synthesized catalysts were characterized by scanning electron microscope, energy dispersive spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, N2 adsorption techniques, fluorescence spectra, transmission electronic microscope and ultraviolet visible diffuse reflectance spectroscopy. Rhodamine B was used as a simulated organic pollutant, and the photocatalytic degradation activity of aerogel catalysts was evaluated under visible light. The results show that all the catalysts have good adsorption capacity, and the adsorption rate is up to 30–50% due to the large specific surface area of SiO2 aerogel carrier. When the metal ion is 5 mol%, the optimum doping concentration of titanium is 60 mol%. The catalysts containing Y and Zn showed the best catalytic performance, and the degradation rate reached about 98% after 180 min of photoreaction. The doping of appropriate amount of rare earth elements and transition metal elements not only contributes to light absorption and matrix adsorption, promotes the formation of hydroxyl radicals, but also reduces the band gap of the catalyst and has high photogenerated carrier transfer efficiency. Therefore, the visible light degradation performance of the catalyst is obviously improved.

Graphical abstract

The picture consists of three parts: first, the preparation of the catalysts (various raw materials are stirred continuously and adjusted pH, and then the catalyst is obtained by solvent exchange, drying and roasting); second, the catalytic process (catalysis is carried out in a dark box with a visible light source); third, the possible mechanism of catalysis.

Highlights

  • MxCey/(TiO2)z@SiO2 aerogel composites were prepared by sol–gel combined with atmospheric pressure drying method.

  • The specific surface area of the catalysts is mainly between 200 and 300 m2/g, and the pollutant adsorption rate can reach 30–50%.

  • When the metal ion is 5 mol%, the optimum doping concentration of titanium is 60 mol%.

  • The catalyst containing Y and Zn showed the best catalytic performance.

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Author contributions

G.F. established the analytical method, wrote the paper, analyzed the data, wrote the first draft of the manuscript, data validation, visualization, figure captions, final draft. S.Y. conceptualization/ conceived the study idea, planned and designed the review structure, revised the article. A.J. funding acquisition. All authors have read and agreed to the published version of the manuscript.

Funding

The research was supported by Guizhou Provincial Science and Technology Projects (Qianke- hezhicheng [2021] Yiban 493), GIT Academic Seedling Training and Innovation Exploration Project (No. GZLGXM-11,GZLGXM-19), and Guizhou Education Department Youth Science and Technology Talents Growth Project (No. Qianjiaohe KY [2021]254).

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  1. These authors contributed equally: Guifei Zhang, Shiyun Tang.

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  1. College of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, Guizhou, China

    Guifei Zhang

  2. Guizhou Institute of Technology, Guiyang, 550003, Guizhou, China

    Shiyun Tang & Anjiang Tang

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Zhang, G., Tang, S. & Tang, A. Construction of bimetallic co-doped ordered mesoporous MxCey/(TiO2)z@SiO2 aerogel composite material and its photocatalytic performance under visible light. J Sol-Gel Sci Technol 106, 265–280 (2023). https://doi.org/10.1007/s10971-022-06030-5

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