Evaluation of the photocatalytic activity of TiO2 based catalysts for the degradation and mineralization of cyanobacterial toxins and water off-odor compounds under UV-A, solar and visible light
Evaluation of the photocatalytic activity of TiO2 based catalysts for the degradation and mineralization of cyanobacterial toxins and water off-odor compounds under UV-A, solar and visible light
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DOI：
10.1016/j.cej.2014.03.095
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发表时间：
2015-02-01
影响因子：
15.1
通讯作者：
Hiskia, A.
中科院分区：
文献类型：
--
作者：
Fotiou, T.;Triantis, T. M.;Hiskia, A.
由于TiO2光催化剂能够在UV-A辐射下降解多种有机化合物，因此新型TiO2光催化剂的开发受到越来越多的关注。为了评价新合成材料的光催化性能，在光催化过程中遵循特定的步骤是必不可少的。应特别注意光照强度、氧气存在、催化剂负载量、底物初始浓度、吸附、pH、不同照射波长、矿化、中间产物和毒性。在本研究中，考察了市售材料(Degussa P25、Kronos VLP-7000)和自制材料(N-TiO2光催化剂、GO-TiO2光催化剂和Ref-TiO2光催化剂)在UV-A、太阳光和可见光照射下对蓝藻毒素微囊藻毒素-LR和异味化合物(土豆、2-甲基异龙脑)的光催化降解和矿化能力。研究了不同实验条件下微囊藻毒素-LR中间产物的鉴定及其毒性。结果表明，在所有的化合物中，Degussa P25是在UV-A光照射下性能较好的催化剂。在太阳光下，掺杂材料(N-TiO2光催化剂、GO-TiO2光催化剂、Kronos VLP-7000光催化剂)均能有效地降解所有化合物，表现出比未掺杂材料(Ref-TiO2光催化剂)更好的光催化性能。在可见光照射下，只有可见光活化材料表现出一定的光催化活性(N-二氧化钛，Kronos VLP-7000)。研究还表明，为了对几种催化剂(实验室内和实验室间)的光催化性能有可重复性的评价结果，需要仔细选择实验参数。(C)2014爱思唯尔B.V.保留所有权利。
Research on the development of new TiO2 based photocatalysts has been receiving increased attention due to the ability of TiO2 to degrade a great variety of organic compounds upon UV-A irradiation. In order to evaluate the photocatalytic performance of the new synthesized materials, it is essential to follow specific procedures during the photocatalytic process. Special care should be given on light intensity, presence of oxygen, catalyst loading, initial concentration of substrate, adsorption, pH, different irradiation wavelength, mineralization, intermediate products and toxicity. In this study, catalysts such as commercially available materials (Degussa P25, Kronos vlp-7000) and home prepared materials (N-TiO2, GO-TiO2 and Ref-TiO2) have been tested for their photocatalytic ability on the degradation and mineralization of the cyanobacterial toxin microcystin-LR and off-odor causing compounds (geosmin, 2-methylisoborneol) under UV-A, solar and visible light irradiation. Also, the identification of intermediate products and their toxicity under different experimental conditions for microcystin-LR was studied. Our results showed that in all cases of the compounds Degussa P25 was the better performing catalyst under UV-A light irradiation. Under solar light, all compounds were effectively degraded with the doped materials (N-TiO2, GO-TiO2, Kronos vlp-7000) showing better photocatalytic performance than theirs undoped material (Ref-TiO2). As far as concerning visible light irradiation, only the visible light activated materials showed some photocatalytic activity (N-TiO2, Kronos vlp-7000). It was also showed in order to have reproducible evaluation results on the photocatalytic performance of several catalysts (intra and inter-laboratory), a careful selection of experimental parameters is required. (C) 2014 Elsevier B.V. All rights reserved.