化工新型材料

化工新型材料 ›› 2022, Vol. 50 ›› Issue (1) : 201-206. DOI: 10.19817/j.cnki.issn1006-3536.2022.01.041

科学研究

Bi₂₀TiO₃₂/蒙脱石复合材料光催化降解甲基橙研究

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Study on photocatalytic degradation of methyl orange by Bi₂₀TiO₃₂/MMT composite

Xiang Haichun^1,2, Tuo Biyang^1,2,3, Song Xiang^1,2, Hu Keming^1,2, Tian Jinwang^1,2, Wang Jianli⁴

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Received		Published
2020-10-18		2022-01-20
Issue Date	Revised Date
2022-02-08	2020-10-18

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摘要

通过溶胶-凝胶法制备了Bi₂₀TiO₃₂/蒙脱石复合材料(Bi₂₀TiO₃₂/MMT),采用多种手段对其结构、形貌、化学成分和吸光特性进行了表征,研究了在不同条件下对甲基橙的光催化降解,并通过自由基掩蔽试验提出了相应的光催化机制。结果表明:Bi₂₀TiO₃₂/MMT中Bi₂₀TiO₃₂结晶性良好,禁带宽度为2.41eV,对甲基橙的光催化降解受pH、溶液初始浓度和材料投加量影响;在pH为3、溶液初始浓度为20mg/L、Bi₂₀TiO₃₂/MMT投加量为0.50g/L的条件下,所制备的Bi₂₀TiO₃₂/MMT具有较高的光催化活性,光照120min后甲基橙脱色率能达到98.25%,并且在光催化反应中起主要作用的活性物质是超氧自由基和空穴。

Abstract

Bi₂₀TiO₃₂/montmorillonite composite (Bi₂₀TiO₃₂/MMT) was prepared by the sol-gel method.Various methods were employed to characterize the structure,morphology,chemical composition and the light absorption characteristics.The photocatalytic degradation of methyl orange (MO) under different conditions was studied.The corresponding photocatalytic mechanism was proposed by free radical masking test.The results showed that Bi₂₀TiO₃₂ in Bi₂₀TiO₃₂/MMT had good crystallinity,the band gap was 2.41eV.The photocatalytic degradation of MO by Bi₂₀TiO₃₂/MMT was affected by pH,initial concentration of the solution and the dosage of composite.At a pH of 3,an initial concentration of 20mg/L,and a dosage of 0.50g/L,the prepared Bi₂₀TiO₃₂/MMT had a high photocatalytic activity.After 120 minutes of irradiation,the decolorization rate of MO could reach 98.25%.The active substances that played a major role in the photocatalytic reaction were superoxide radicals and holes.

关键词

溶胶-凝胶法 / Bi₂₀TiO₃₂ / 蒙脱石 / 甲基橙 / 光催化降解

Key words

sol-gel method / Bi₂₀TiO₃₂ / montmorillonite / methyl orange / photocatalytic degradation

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Bi₂₀TiO₃₂/蒙脱石复合材料光催化降解甲基橙研究[J]. 化工新型材料, 2022, 50(1): 201-206 DOI:10.19817/j.cnki.issn1006-3536.2022.01.041

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