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首页> 外文期刊>Journal of industrial and engineering chemistry >UV-VIS photocatalytic degradation of nitrobenzene from water using heavy metal doped titania
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UV-VIS photocatalytic degradation of nitrobenzene from water using heavy metal doped titania

机译：重金属掺杂二氧化钛的紫外可见光催化降解水中的硝基苯

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The photocatalytic degradation of nitrobenzene (NB) under UV-VIS irradiation with un-doped TiO2 and various heavy metals doped TiO2 powders were studied for aerated solutions. The dopant type (Fe, Co, Ni) and its concentration (0.5-5 wt.% TiO2) influence on pollutant degradation efficiency were investigated. The photocatalyst with lowest Fe content (0.5 wt.%) showed a considerable better behaviour in respect to pollutant degradation than catalyst with higher Fe content and Co and Ni doped titania catalysts. The experiments were carried out for solutions with (0.37-8.45) x 10(-4) M NB initial content, using 50-250 mg/L catalyst dose, at various pHs (4-10) and irradiation time between 30 and 240 min. The kinetics of NB degradation and organic nitrogen mineralization was assessed and pseudo-first order rate constants were calculated. For optimum working conditions (0.5 wt.% Fe doped-TiO2 loading of 250 mg/L, 2.52 x 10(-4) M pollutant initial concentration, pH = 7 and 240 min irradiation time) NB removal and organic nitrogen mineralization efficiencies were 99% and 85%, respectively. It was also demonstrated that degradation process occurs on catalyst surface, so experimental results are in accordance with Langmuir-Hinshalwood model. (C) 2014 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译：研究了未掺杂的TiO2和各种重金属掺杂的TiO2粉末在UV-VIS照射下对硝基苯（NB）的光催化降解。研究了掺杂剂类型（Fe，Co，Ni）及其浓度（0.5-5 wt。％TiO2）对污染物降解效率的影响。具有最低Fe含量（0.5重量％）的光催化剂在污染物降解方面表现出比具有较高Fe含量的催化剂和Co和Ni掺杂的二氧化钛催化剂更好的性能。实验是使用50-250 mg / L催化剂剂量，各种pH（4-10）和30至240分钟的辐照时间对初始浓度为（0.37-8.45）x 10（-4）M NB的溶液进行的。评估了NB降解和有机氮矿化的动力学，并计算了伪一级速率常数。对于最佳的工作条件（0.5 wt。％的Fe掺杂的TiO2负载量为250 mg / L，2.52 x 10（-4）M污染物初始浓度，pH = 7和240分钟的辐照时间），去除NB和有机氮的矿化效率均为99 ％和85％。还证明了降解过程发生在催化剂表面，因此实验结果符合Langmuir-Hinshalwood模型。 （C）2014韩国工业和工程化学学会。由Elsevier B.V.发布。保留所有权利。

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