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首页> 外文期刊>Environmental Science & Technology >Photocatalytic Degradation Efficiency and Mechanism of Microcystin-RR by Mesoporous Bi_2WO_6 under Near Ultraviolet Light
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Photocatalytic Degradation Efficiency and Mechanism of Microcystin-RR by Mesoporous Bi_2WO_6 under Near Ultraviolet Light

机译：Bi_2WO_6在近紫外光下的光催化降解微囊藻毒素-RR的机理

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摘要

Microcystin-RR (MC-RR) is one of the most common cyanotoxin microcystins in fresh water and is of great concern due to its potential hepatotoxicity. In the present study, Bi_2WO_6 was synthesized with a hydrothermal method by varying the pH of the reaction solution in the range of 1-11. The surface area of the catalysts decreased, but the crystallinity and crystal size increased with the pH. The adsorption and degradation capacities of the catalysts decreased with increasing the preparation solution pH. The Bi_2WO_6 prepared at pH 1 (Bi_2WO_6-pH1) displayed the highest adsorption and degradation capacity to MC-RR even though it consisted of randomly aggregated particles. Nearly 100% of MC-RR at 10 mg L~(-1) was removed after 30 min of irradiation of near-ultraviolet light (300-400 nm) in a solution with Bi_2WO_6 concentration of 0.2 g L~(-1). The photodegradation efficiency of Bi_2WO_6-pH1 was greater in acid medium than in basic solutions. Several intermediate products were observed and identified by liquid chromatography/mass spectrometry/mass spectrometry, and a unique photodegradation pathway was proposed. It was assumed that a photo-Kolbe process happened at the site carboxyl acid group of the d-G1u residue by die photogenerated holes, producing a hydroperoxyl product at m/z 513.8. This intermediate could be further decomposed to an alcohol product at m/z 505.8 and a ketone product at m/z 504.8. The aromatic ring and diene bond of the Adda chain could also be attacked by the holes and form phenol and diol products.
机译：微囊藻毒素-RR（MC-RR）是淡水中最常见的氰毒素微囊藻毒素之一，由于其潜在的肝毒性而备受关注。在本研究中，通过水热法通过在1-11范围内改变反应溶液的pH值来合成Bi_2WO_6。催化剂的表面积减少，但是结晶度和晶体尺寸随pH值增加。催化剂的吸附和降解能力随制备溶液pH的升高而降低。在pH 1（Bi_2WO_6-pH1）下制备的Bi_2WO_6对MC-RR的吸附和降解能力最高，尽管它由随机聚集的颗粒组成。在Bi_2WO_6浓度为0.2 g L〜（-1）的溶液中照射近紫外光（300-400 nm）30分钟后，将10 mg L〜（-1）的MC-RR去除了近100％。在酸性介质中，Bi_2WO_6-pH1的光降解效率高于在碱性溶液中。通过液相色谱/质谱/质谱观察和鉴定了几种中间产物，并提出了独特的光降解途径。假定通过光生空穴在d-G1u残基的位点羧基处发生了光-Kolbe过程，产生了m / z 513.8的氢过氧产物。该中间体可以进一步在m / z 505.8下分解为醇产物和在m / z 504.8上的酮产物。 Adda链的芳环和二烯键也可能受到孔的攻击，形成酚和二醇产物。

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  • 来源
    《Environmental Science & Technology》 |2012年第4期|p.2345-2351|共7页
  • 作者

    Peng Chen; Lingyan Zhu; Shuhong Fang; Chunying Wang; Guoqiang Shan;

  • 作者单位

    College of Environmental Science and Engineering, Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071,People's Republic of China;

    College of Environmental Science and Engineering, Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071,People's Republic of China;

    College of Environmental Science and Engineering, Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071,People's Republic of China;

    College of Environmental Science and Engineering, Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071,People's Republic of China;

    College of Environmental Science and Engineering, Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin 300071,People's Republic of China;

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