Influence of solution chemistry on the removal of Ni(II) from aqueous solution to titanate nanotubes
Influence of solution chemistry on the removal of Ni(II) from aqueous solution to titanate nanotubes
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DOI：
10.1016/j.cej.2010.12.060
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发表时间：
2011-03
影响因子：
15.1
通讯作者：
G. Sheng;Shitong Yang;Jiang Sheng;Donglin Zhao;Xiangke Wang
中科院分区：
文献类型：
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作者：
G. Sheng;Shitong Yang;Jiang Sheng;Donglin Zhao;Xiangke Wang
在这项工作中，镍（II）从水溶液中的钛酸盐纳米管（TNTs）作为各种水质参数的函数的吸附在环境条件下进行了研究。结果表明，TNT对Ni（II）的吸附强烈依赖于pH和离子强度。在pH<6.0时，腐殖酸（HA）/富里酸（FA）对Ni（II）的吸附有正效应，而在pH> 6.0时，腐殖酸/富里酸对Ni（II）的吸附有负效应。在低pH值下，Ni（II）的吸附主要是外球表面络合或与TNT表面Na+/H+的离子交换，而在高pH值下，内球表面络合是主要的吸附机理。
In this work, adsorption of Ni(II) from aqueous solution to titanate nanotubes (TNTs) as a function of various water quality parameters was investigated under ambient conditions. The results indicated that the adsorption of Ni(II) to TNTs was strongly dependent on pH and ionic strength. A positive effect of humic acid (HA)/fulvic acid (FA) on Ni(II) adsorption was found at pH<6.0, whereas a negative effect was observed at pH>6.0. At low pH, the adsorption of Ni(II) was dominated by outer-sphere surface complexation or ion exchange with Na+/H+on TNT surfaces, whereas inner-sphere surface complexation was the main adsorption mechanism at high pH. The TNTs are suitable material for the preconcentration of Ni(II) from large volumes of aqueous solutions.