| Citation: |
SONG Xueli, WANG Tao, QI Yuhui, et al. Preparation and photocatalytic performance of montmorillonite-BiVO4/BiOIO3 composite[J]. Acta Materiae Compositae Sinica.
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BiOIO has good photocatalytic activity for the removal of organic pollutants in water. But it only absorbs ultraviolet light, which accounts for less than 5% of the solar spectrum and seriously affects its practical application. BiVO has a narrower band gap (~2.4 eV) and a wider light absorption range. The purpose of this study is to construct a heterojunction between BiVO and BiOIO, thereby broadening the light absorption region and achieving higher photocatalytic activity under visible light. Meanwhile, organic-modified montmorillonite will be used to support BiVO/BiOIO composite. The purpose is that the composites have both high photocatalytic degradation activity and good adsorption performance for organic pollutants in water. It is suitable for treating wastewater containing different organic pollutants.
Modified montmorillonite loaded with BiVO4/BiOIO3 composite materials (MMT-BiVO/BiOIO) were prepared using hexadecyltrimethylammonium bromide to modify montmorillonite, BiVO and BiOIO precursors using a hydrothermal method. The structure and microstructure of the composite materials were analyzed using XRD, SEM, and TEM. Its optical properties using UV spectroscopy. Its optical performance were investigated byUV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) and photoluminescence spectroscopy.
The XRD test results of 40% MMT-65%BV/BO show the characteristic diffraction peaks include BiVO and BiOIO. And the diffraction peaks of the organic modified montmorillonite located at 5.5° and 19.6°. It indicated that the composite material was successfully prepared. The sheet-like BiOIO and particle BiVO is loaded on the surface of montmorillonite in SEM. HRTEM analysis shows that the gray and black regions correspond to the (112) crystal plane of BiVO and the (002) crystal plane of BiOIO, with interplanar distances of 0.27 nm and 0.287 nm, respectively. Compared to BiOIO, the absorption edge of composite materials occur red shift to visible light region and absorption intensity is enhanced from 200 nm to 800 nm in UV-vis DSR. The fluorescence intensity of 40%MMT-65% BiVO/BiOIO located near 579 nm is lower than that of BiVO or BiOIO. Its half circular diameter is the smallest in electrochemical impedance spectra. These results indicate that the recombination rate of photo generated carriers is reduced by constructing II-scheme BiVO/BiOIO heterojunction. Meanwhile, the electrostatic attraction between modified montmorillonite and photogenerated electron further improve the separation rate of photo generated charge carriers and is beneficial for photocatalytic reactions. In the experiment of simulating visible light degradation of acid fuchsin (AF), the degradation rate of AF is 97.7% with 60 min by 40% MMT-65% BiVO/BiOIO as photocatalysts. The pseudo-first-order rate constant is 0.0532 min-1 and the active species are h, O in photodegradation reaction. As well as, the composite has excellent adsorption performance for cationic dyes, such as crystal violet (CV), methylene blue (MB) and malachite green (MG). The photodegradation effect on methyl orange (MO), Rhodamine B (RhB) and tetracycline hydrochloride (TC) is more effectiveConclusion: The MMT-BiVO/BiOIO composite material improves the narrow light absorption range of BiOIO3. The light absorption area of the material becomes wider. The light absorption edge shift from 382 nm to 561 nm. The absorbance increase in 200~310 nm and 360~800 nm regions. Amioncations in the modified montmorillonite capture photogenerated electrons through electrostatic interactions, which enhances the migration of photo generated carriers in semiconductor materials and reduces the recombination rate of photo generated electrons and holes. The degradation rate of AF solution is 97.7% with illumination 60 min using 20 mg of 40% MMT-65%BV/BO as photocatalyst. Compared to 20 mg 65% BiVO/BiOIO, the photocatalytic degradation rate of AF decreased by 0.8%, but the mass of the catalytic center is reduced by 40%. The composite material can photodegrade organic pollutant including MO, RhB, AF, and TC, and also have good adsorption capability for cationic dyes such as CV, MB, and MG. The organic modified montmorillonite loaded with BiVO/BiOIO is simple to prepare and can be used for the treatment of actual dye wastewater.
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