| 光催化降解水体异味物质2-MIB的机理 |
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| 引用本文： | 何燕,刘立明,张钰,方艳芬,顾彦,黄应平,张爱清. 光催化降解水体异味物质2-MIB的机理[J]. 环境工程学报, 2012, 6(8): 2533-2538 |
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| 作者姓名： | 何燕 刘立明 张钰 方艳芬 顾彦 黄应平 张爱清 |
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| 作者单位： | 1. 三峡库区生态环境教育部工程研究中心三峡大学,宜昌,443002
2. 中南民族大学催化材料科学湖北省暨国家民委一教育部共建重点实验室,武汉,430074 |
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| 基金项目： | 国家自然科学基金资助项目（20877048）；湖北省创新群体项目（2009CDA020）；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（chcl10007） |
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| 摘 要： | 以水体异味物质2-甲基异莰醇(2-methylisoborneol,2-MIB)为研究对象,在紫外光(λ<380 nm)照射下,探讨TiO2(P25)对2-MIB的光催化降解特性及光化学作用机理。结果表明,UV/TiO2光催化体系可以有效去除水体异味物质2-MIB,紫外光照射60 min,对2-MIB的降解率达95%。同时研究了光催化降解体系介质pH,共存腐殖酸(HA)和过硫酸钾(K2S2O8)对UV/TiO2光催化体系降解2-MIB的影响,发现低浓度HA([HA]≤0.5 mg/L)可以提高2-MIB降解速率,当HA浓度高于0.5 mg/L,2-MIB降解反应受到抑制;同时当加入电子受体K2S2O8后,降解体系中活性物种羟基自由基(.OH)明显增加,提高了TiO2对2-MIB的降解能力。利用苯甲酸荧光光度法和POD-DPD显色法跟踪测定降解过程中羟基自由基(·OH)和过氧化氢(H2O2)的变化,表明光催化反应涉及·OH机理。
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| 关 键 词： | 2-甲基异莰醇(2-MIB) TiO2 光催化 |
Mechanism for photocatalytic degradation of odor 2-methylisoborneol in drinking water |
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| He Yan,Liu Liming,Zhang Yu,Fang Yanfen,Gu Yan,Huang Yingping and Zhang Aiqing. Mechanism for photocatalytic degradation of odor 2-methylisoborneol in drinking water[J]. Techniques and Equipment for Environmental Pollution Control, 2012, 6(8): 2533-2538 |
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| Authors: | He Yan Liu Liming Zhang Yu Fang Yanfen Gu Yan Huang Yingping Zhang Aiqing |
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| Affiliation: | 1.Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University, Yichang 443002,China;2.Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education,South-Central University for Nationalities,Wuhan 430074,China) |
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| Abstract: | The photocatalytic degradation characteristics and photochemical mechanism of odor 2-methylisoborneol(2-MIB) by TiO2(P25) under UV irradiation(λ<380 nm) were studied.The results showed that 2-MIB in water bodies was effectively degraded in the photocatalytic system of UV/TiO2.The degradation rate of 2-MIB reached 95% under UV illumination for 60 min.The effects of pH,coexisting humic acid(HA) and potassium sulfate(K2S2O8) on UV/TiO2 system were researched.The results demonstrated that low concentration of HA(≤ 0.5 mg/L) improved the degradation while high concentration of HA(>0.5 mg/L) inhibited the degradation of 2-MIB.K2S2O8,an electronic acceptor,enhanced the degradation rate of 2-MIB by significantly increasing the concentration of hydroxyl radical(·OH) in the system.The concentration of ·OH and hydrogen peroxide(H2O2) was determined by the fluorescence method and the N,N-diethyl-p-phenylenediamine(DPD) method. |
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| Keywords: | 2-methylisoborneol Ti02 photocatalysis |
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