化工新型材料

化工新型材料 ›› 2021, Vol. 49 ›› Issue (8) : 210-214. DOI: 10.19817/j.cnki.issn 1006-3536.2021.08.045

科学研究

纳米介孔TiO₂光催化剂对染料污水的去除研究

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作者信息 +

Study on the removal of dye effluent by M-TiO₂ photocatalyst

Yang Chun¹, Li Yue², Chen Guofeng², Zhou Guiyin¹, Liu Sihua¹

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文章历史 +

Received		Published
2021-03-25		2021-08-20
Issue Date	Revised Date
2021-09-07	2021-03-25

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摘要

以四氯化钛为原料,采用一步水热法制备出具有介孔结构的二氧化钛(M-TiO₂),并对其光催化性能进行研究。比表面积(BET)分析得出M-TiO₂的孔径约为28nm,比表面积为59.554m²/g,孔容体积为0.3678cm³/g;光电性能测试结果表明,与商用催化剂P25相比,M-TiO₂带隙宽度窄,吸收范围宽,对光的利用能力更高,瞬时光电流强、电子传输阻力小、空穴电子对分离速度快;通过光催化降解亚甲基蓝(MB),其降解效率较高,在80min降解率能达到89%;通过研究M-TiO₂降解MB的作用机制,发现羟基自由基是降解的主要原因,空穴和超氧自由基起次要作用。

Abstract

A mesoporous titanium dioxide (M-TiO₂) was synthesized by one-step hydrothermal method using titanium terrachlorid,and studied the photocatalytic performance of M-TiO₂.The result of BET analysis showed that the pore size of M-TiO₂ was about 28nm,the specific surface area was 59.554m²/g,and the volume of entrance was 0.3678cm³/g.Compared with commercial catalyst P25,the M-TiO₂ possessed the narrower band gap,wider absorption range,higher utilization of visible light,stronger instantaneous light current,lower electron transmission resistance and faster separation speed of hole electron pairs.The results of photocatalytic degradation of methylene blue (MB) experiment shown that the degradation efficiency was as high as 89% in 80 minutes.The mechanism of M-TiO₂ degradation of MB shown that the hydroxyl radical was the main substance for degradation,while hole and superoxide radical played a secondary role.

关键词

介孔二氧化钛 / 光催化 / 光电性能 / 降解 / 亚甲基蓝

Key words

M-TiO₂ / photocatalysis / photoelectric property / degradation / methylene blue

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纳米介孔TiO₂光催化剂对染料污水的去除研究[J]. 化工新型材料, 2021, 49(8): 210-214 DOI:10.19817/j.cnki.issn 1006-3536.2021.08.045

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