化工新型材料

化工新型材料 ›› 2022, Vol. 50 ›› Issue (2) : 176-180. DOI: 10.19817/j.cnki.issn1006-3536.2022.02.035

科学研究

模板法制备介孔TiO₂及其在模拟太阳光下光催化还原Cr(Ⅵ)性能的研究

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Preparation of mesoporous TiO₂ by template method and property of Cr(Ⅵ) photocatalytic reduction under simulated sunlight

Zhang Yanqing, Ji Qingpeng, Huang Yue, Wang Qi, Zhao Baoxiu

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Received
2020-10-23
Issue Date	Revised Date
2022-03-21	2020-10-23

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摘要

以钛酸四丁酯为钛源,十六烷基三甲基溴化铵(CTAB)为模板剂,采用溶胶-凝胶法制备了高催化性能的介孔TiO₂光催化剂。以Cr(Ⅵ)作为目标污染物,对比探究了制备过程中不同溶胶pH、CTAB添加量、煅烧温度这3种控制因素对所制备的介孔TiO₂光催化性能的影响。采用Brunauer-Emmett-Teller(BET)法、X射线衍射(XRD)、扫描电镜(SEM)等手段表征了材料的介孔结构、形貌、晶型以及吸光性能。并通过改变Cr(Ⅵ)浓度测试介孔TiO₂在太阳光下的光催化性能。结果表明:介孔TiO₂为锐钛矿型,较不添加模板剂TiO₂孔径增大,粒径减小,吸收边界红移,禁带宽度变窄为2.80eV,有效地提高了光催化活性。

Abstract

Mesoporous TiO₂ photocatalysts with high catalytic performance were prepared by sol-gel method using tetrabutyl titanate as titanium source and hexadecyl trimethyl ammonium bromide (CTAB) as template.Taking Cr(Ⅵ) as the target pollutant,the effects of different pH,CTAB addition and calcination temperature on the photocatalytic properties of mesoporous TiO₂ were compared.The mesoporous structure,morphology,crystal form,light absorption properties of the materials were characterized by Brunauer-Emmett-Teller (BET) method,X ray diffraction (XRD),scanning electron microscopy (SEM) method.The photocatalytic properties of mesoporous TiO₂ under sunlight were measured by changing Cr(Ⅵ) concentration.The results showed that the mesoporous TiO₂ was anatase type,compared with TiO₂ without template agent,the pore size of TiO₂ increased,the particle size decreased.the absorption boundary red-shifted,and the band gap narrowed to 2.80eV,which effectively improved the photocatalytic activity.

关键词

介孔二氧化钛 / 溶胶-凝胶法 / 太阳光 / 十六烷基三甲基溴化铵

Key words

mesoporous TiO₂ / sol-gel method / sunlight / CTAB

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模板法制备介孔TiO₂及其在模拟太阳光下光催化还原Cr(Ⅵ)性能的研究[J]. 化工新型材料, 2022, 50(2): 176-180 DOI:10.19817/j.cnki.issn1006-3536.2022.02.035

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