Adsorption mechanism and property of a novel adsorption material PAM/SiO2 towards 2,4,6-trinitrotoluene.
Adsorption mechanism and property of a novel adsorption material PAM/SiO2 towards 2,4,6-trinitrotoluene.
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DOI：
10.1016/j.jhazmat.2009.02.042
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发表时间：
2009-08
影响因子：
13.6
通讯作者：
Fuqiang An;Xiaoqing Feng;Baojiao Gao
中科院分区：
文献类型：
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作者：
Fuqiang An;Xiaoqing Feng;Baojiao Gao
2，4，6-三硝基甲苯（TNT）对许多生物体具有毒性和致突变性，因此对TNT的投放量制定了越来越严格的限制。本文将功能单体丙烯酰胺（AM）逐步接枝到硅胶颗粒表面，形成了对TNT有较强吸附能力的接枝粒子PAM/SiO2。采用静态和动态吸附法研究了PAM/SiO2对TNT的吸附机理和吸附性能。实验结果表明，PAM/SiO2对TNT具有较强的吸附能力，吸附剂中存在3种氢键，即特有的NH π氢键（芳香氢键）和CH π OC π氢键。饱和吸附量可达0.873mgg-1。经验Freundlich等温线被发现可以很好地描述平衡吸附数据。pH值和温度对吸附量有较大影响。用盐酸和乙醇的混合溶液作为洗脱剂，吸附的TNT很容易从PAM/SiO2上洗脱下来。PAM/SiO2具有良好的可重复使用性。
2,4,6-Trinitrotoluene (TNT) is toxic and mutagenic to many living organisms, so more and more rigorous limits on the letting amount of TNT have been established. In this paper, functional monomer acrylamide (AM) was grafted step by step on the surface of silica gel particles, and the grafted particle PAM/SiO2with strong adsorption ability for TNT was formed. The adsorption mechanism and properties of PAM/SiO2for TNT were researched through static and dynamic methods. The experimental results showed that PAM/SiO2possesses strong adsorption ability for TNT with interaction of three kinds of hydrogen bonds including peculiar NH⋯π hydrogen bond (aromatic hydrogen bond) and CH⋯OC π hydrogen bond. The saturated adsorption amount could reach to 0.873mgg−1. The empirical Freundlich isotherm was found to describe well the equilibrium adsorption data. In addition, the pH and temperature were found to have great influence on the adsorption amount. Mixture solution of HCl and ethanol is used as eluent, and the adsorbed TNT is eluted easily from PAM/SiO2. Finally, PAM/SiO2was found to have excellent reusability.