Effect of hydroxyl group of carboxylic acids on the adsorption of Acid Red G and Methylene Blue on TiO2
Effect of hydroxyl group of carboxylic acids on the adsorption of Acid Red G and Methylene Blue on TiO2
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羧酸羟基对TiO2吸附酸性红G和亚甲蓝的影响
DOI：
10.1016/j.cej.2015.01.109
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发表时间：
2015-06-01
影响因子：
15.1
通讯作者：
Yan, Wei
中科院分区：
文献类型：
--
作者：
Feng, Jiangtao;Zhu, Jinwei;Yan, Wei
尽管近年来TiO2在去除有机污染物方面引起了极大的兴趣，但TiO2的表面化学性质对吸附性能的影响尚不清楚。本文采用水解法在琥珀酸（不含羟基）、苹果酸（含一个羟基）和酒石酸（含两个羟基）中制备TiO2样品，并分别标记为SU-TiO2、MA-TiO2和TA-TiO2。研究了它们对阴离子染料酸性红G（ARG）和阳离子染料亚甲基蓝（MB）的吸附性能。吸附研究表明，ARG或MB的吸附量与所制备的TiO2的碱度或酸度成正比，而碱度或酸度又与所用酸的羟基数有关。因此，SU-TiO2 对 ARG 具有最大的吸附容量，而 TATiO(2) 对 MB 具有最大的吸附容量。此外，TA-TiO2可以重复使用至少5次而不会失去其吸附能力。结果表明，吸附机理涉及静电相互作用和电子受体-供体相互作用。 (C) 2015 Elsevier B.V. 保留所有权利。
While TiO2 has generated great interest in the removal of organic pollutants in recent years, the effect of the surface chemical property of TiO2 on the adsorption performance is unclear. Here, TiO2 samples were prepared in succinic (without hydroxyl group), malic (with one hydroxyl group) and tartaric acid (with two hydroxyl groups) by hydrolysis method and labeled as SU-TiO2, MA-TiO2 and TA-TiO2, respectively. Their adsorption performance for anionic dye-Acid Red G (ARG) and cationic dye-Methylene Blue (MB) was investigated. The adsorption study indicates that the adsorption amount of ARG or MB was proportional to the alkalinity or the acidity, which is related to the number of hydroxyl group of the used acids, of the as-prepared TiO2. Therefore, SU-TiO2 displayed the largest adsorption capacity for ARG, while TATiO(2) had the highest adsorption capacity for MB. Furthermore, TA-TiO2 can be reused at least 5 times without losing its adsorption capacity. The results indicate that the adsorption mechanism involves in the electrostatic interaction and the electron acceptor-donor interaction. (C) 2015 Elsevier B.V. All rights reserved.