One-Pot Synthesis of TiO2/Hectorite Composite and Its Photocatalytic Degradation of Methylene Blue

Catalysts

卷:12

Dingqing Yang¹  Lingzhen Li¹  Xiaomin Hong¹  Jingying Cui¹  Jinyang Chen¹ 

[1] School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;

关键词: photocatalysis;    TiO₂;    hectorite;    one-pot synthesis;    degradation of organic dyes;   

DOI  :  10.3390/catal12030297

来源: DOAJ

【 摘 要 】

TiO₂/hectorite composite photocatalysts with different molar ratios of lithium, magnesium, and silicon were synthesized by a one-pot hydrothermal method. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), N₂ adsorption-desorption isotherms, and ultraviolet-visible diffuse reflectance spectra (UV-Vis DRS). When the molar ratio of lithium, magnesium, and silicon was 1.32:5.34:8 (TH-2), the composite showed the highest UV photocatalytic degradation of methylene blue (MB). The apparent rate constant of TH-2 was 0.04361 min⁻¹, which was about 3.12 times that of EVONIK Degussa commercial TiO₂ of AEROXIDE P25. The improvement of photocatalytic efficiency of the composite was mainly due to its high specific surface area, light trapping ability, and effective separation of electrons (e⁻) and holes (h⁺). At the same time, the F element of hectorite is beneficial to the formation of Ti³⁺ in TiO₂, thus enhancing the photocatalytic activity. After five cycles, the removal rate of MB with TH-2 still reached 87.9%, indicating its excellent reusability.

【 授权许可】

Unknown