TiO2的低温制备及其对有毒有机污染物的降解

doi:10.7517/j.issn.1674-0475.2009.02.149

影像科学与光化学 ›› 2009, Vol. 27 ›› Issue (2): 149-158.DOI: 10.7517/j.issn.1674-0475.2009.02.149

• 研究简报 • 上一篇

TiO₂的低温制备及其对有毒有机污染物的降解

邓安平¹, 黄应平¹, 方艳芬¹, 陈燕¹, 杨天鸣²

1. 三峡大学Alan G. MacDiarmid(艾伦·麦克德尔米德)再生能源研究所, 湖北, 宜昌, 443002;
2. 中南民族大学, 催化材料学湖北省重点实验室, 湖北, 武汉, 430070

收稿日期:2008-05-16 修回日期:2008-09-25 出版日期:2009-03-23 发布日期:2009-03-23
基金资助:
国家重点基础研究发展计划973前期研究课题(2008CB417206);湖北省青年杰出人才基金(2005ABB030);催化材料科学湖北省暨国家民委-教育部共建重点实验室开放基金(CHCL07001)

Low-Temperature Preparation of TiO₂ and Photodegradation of Toxic Organic Pollutants

DENG An-ping¹, HUANG Ying-ping¹, FANG Yan-fen¹, CHEN Yan¹, YANG Tian-ming²

1. Alan G.MacDiarmid Research Institute for Renewable Energy, China Three Gorges University, Yichang 443002, Hubei, P. R. China;
2. Key Laboratory of Catalysis and Materials Science of Hubei Province, South-Central University for Nationalities, Wuhan 430070, H

Received:2008-05-16 Revised:2008-09-25 Online:2009-03-23 Published:2009-03-23

摘要/Abstract

摘要： 溶胶水热法制备了TiO₂粉末,用X射线衍射仪(XRD)、比表面积及孔径分析仪(BET)和透射电镜(TEM)对TiO₂进行了初步表征,结果显示:纳米TiO₂主要为锐钛矿相(含板钛矿相(121)),比表面积为106.2 m²/g.在紫外光(λ≤387 nm)照射条件下,以有机染料罗丹明B(Rhodamine B,RhB)和无色小分子2,4-二氯苯酚(2,4-dichlorophenol,2,4-DCP)的紫外光(λ≤387 nm)光催化降解试验为探针反应,低温(50℃)下制备的TiO₂粉末具有较高光催化活性,对RhB和2,4-DCP有较好的降解效果.通过分析紫外-可见光谱(UV-Vis)、红外光谱(FTIR)和总有机碳(TOC)测定,发现TiO₂/UV体系能使RhB和2,4-DCP发生有效的降解,反应5 h后RhB和7 h后2,4-DCP的矿化率分别达到81.2%和86.8%.同时,采用辣根过氧化物酶(POD)、N,N-二乙基对苯二胺(DPD)分光光度法和苯甲酸荧光光度法分别测定了在降解过程中H₂O₂和羟基自由基(.OH)的变化,表明TiO₂光催化机理涉及到.OH历程.

关键词: 低温制备, TiO₂, 有机污染物, 降解

Abstract: TiO₂ particles were prepared under low-temperature conditions by sol-hydrothermal-steam method.The characteristics of TiO₂ were carried out using XRD,BET,TEM.The results showed the basic structure of product was mainly anatase phase with the existence of brookite phase (121)) and the BET was 106.2 m²/g.The photo-catalytic degradation under UV light (λ≤387 nm) of organic dye Rhodamine B (RhB) was used as probe reactions to evaluate the optimum TiO₂.TiO₂ prepared under low-temperature conditions had a better degradation effect to RhB and 2,4-DCP,which were significantly degradated in TiO₂/UV (λ≤387 nm) system by analysing UV-vis spectroscopy,FTIR and TOC.After 5 h and 7 h the mineralized rate of RhB,2,4-DCP was 81.2%,86.8%,respectively.N,N-diethyl-p-phenylenediamine (DPD),Horseradish peroxidase (POD),spectro-photometry and benzoic acid spectro-fluorescence analysis method were used to detect hydrogen peroxide (H₂O₂) and hydrogen radicals (·OH).The experiment results indicated that photo-catalysis degradation of TiO₂ mainly referred to ·OH radical mechanism.

Key words: low-temperature preparation, titania, organic pollutants, degradation

中图分类号:

邓安平, 黄应平, 方艳芬, 陈燕, 杨天鸣. TiO₂的低温制备及其对有毒有机污染物的降解[J]. 影像科学与光化学, 2009, 27(2): 149-158.

DENG An-ping, HUANG Ying-ping, FANG Yan-fen, CHEN Yan, YANG Tian-ming. Low-Temperature Preparation of TiO₂ and Photodegradation of Toxic Organic Pollutants[J]. Imaging Science and Photochemistry, 2009, 27(2): 149-158.

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TiO₂的低温制备及其对有毒有机污染物的降解

Low-Temperature Preparation of TiO₂ and Photodegradation of Toxic Organic Pollutants

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