Photocatalytic degradation of methyl orange by Bi 20 TiO 32 –montmorillonite composite

Micro & nano letters

article

Haichun Xiang¹  Biyang Tuo¹  Xiang Song¹ 

[1] College of Mining, Guizhou University;GuiZhou Key Laboratory of Comprehensive Utilization of Non-metallic mineral resources;National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas

关键词: pH;    nanocomposites;    catalysis;    photochemistry;    wastewater treatment;    dyes;    sol-gel processing;    methyl orange dye wastewater pollution;    photocatalytic degradation;    montmorillonite composite;    sol–gel method;    decolourisation rate;    pseudofirst-order kinetic equation;    superoxide radicals;   

DOI  :  10.1049/mnl.2020.0127

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

To solve the problem of methyl orange (MO) dye wastewater pollution, TiO 2 –montmorillonite composite (TiO 2 –MMT) and Bi 20 TiO 32 –montmorillonite composite (Bi 20 TiO 32 –MMT) were synthesised by the sol–gel method, and they were used for photocatalytic degradation of MO solution. The results showed that TiO 2 in TiO 2 –MMT existed as the anatase type, and Bi 20 TiO 32 in Bi 20 TiO 32 –MMT existed as the tetragonal crystal type. When the dosage of the composite was 0.50 g/l, the initial concentration of the MO solution was 20 mg/l, and the pH was 3, the decolourisation rate of MO solution using TiO 2 –MMT treating was 87.11%, and it reached 98.50% after Bi 20 TiO 32 –MMT treating. When Bi 20 TiO 32 –MMT was reused four times, the decolourisation rate of the MO solution was only reduced by 3.5%. The photocatalytic degradation between MO solution and Bi 20 TiO 32 –MMT complied with the pseudo-first-order kinetic equation. Holes and superoxide radicals interacted directly with MO during photocatalytic degradation, which reduced the probability of hole–electron recombination, and improved the photocatalytic degradation property of Bi 20 TiO 32 –MMT. Bi 20 TiO 32 –MMT has excellent stability property, which makes it a good composite in the treatment of dye wastewater.

【 授权许可】

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