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以硅烷偶联剂KH550和均苯三甲酸(BTC)对凹凸棒石(ATP)进行改性作为重金属离子的吸附剂,研究了其对水溶液中Hg(Ⅱ)的吸附性能。采用FT-IR、SEM等对改性前后的凹凸棒石进行表征;研究了溶液的pH值、时间和温度等因素对Hg(Ⅱ)吸附特性的影响,并对Hg(Ⅱ)的吸附过程进行动力学和热力学分析。研究表明,改性凹凸棒石对Hg(Ⅱ)的吸附符合Langmuir等温吸附模型,最大吸附容量为143.68mg/g。改性凹凸棒石对Hg(Ⅱ)的吸附动力学符合准二级动力学方程。此外,均苯三甲酸改性凹凸棒石是可重复使用的,在5次再生实验后依然保持着良好的吸附能力。这些结果表明,均苯三甲酸改性凹凸棒石是一种高效的Hg(Ⅱ)吸附材料。
Abstract：The attapulgite(ATP) was modified by KH550 and 1,3,5-Benzenetricarboxylic acid(BTC) as an effective adsorbent towards heavy metal ions; and the adsorption behavior for the removal of Hg(Ⅱ) from wastewater was studied. The modified attapulgite was characterized with FT-IR and SEM. The influence of the p H, adsorption time and temperature on the adsorption behavior of Hg(Ⅱ) were investigated, meanwhile, the adsorption process was analyzed by adsorption kinetics and thermodynamics. The adsorption processes could be accurately described by Langmuir isothermal adsorption model and the maximum adsorption capacity was 143.68 mg/g. The adsorption kinetics was conformed to fit the Pseudo-second-order adsorption model. Furthermore, the 1,3,5-benzenetricarboxylic acid-modified attapulgite was reusable, which could keep the adsorption capacity after five adsorption-desorption cycles. It is demonstrated that the 1,3,5-benzenetricarboxylic acid-modified attapulgite can be selected as an effective adsorbent for Hg(Ⅱ) removal from aqueous solutions.
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基本信息:
DOI：10.16026/j.cnki.iea.2019060490
中图分类号:X703;TU991.2
引用信息:
[1]李博,李明,张琪,等.均苯三甲酸改性凹凸棒石对水中Hg(Ⅱ)的吸附研究[J].离子交换与吸附,2019,35(06):490-500.DOI:10.16026/j.cnki.iea.2019060490.
基金信息:
国家水污染防治重大科技专项(2017ZX07101-001);; 国家自然科学青年基金项目(21906053);; 中央高校基本科研业务费专项资金资助(2019MS109,2018QN090)
2019-12-20
2019-12-20