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环境化学  2015 

表面接枝聚乙烯亚胺硅胶微粒对铬酸根的吸附特性

Keywords: 铬酸根,聚乙烯亚胺,硅胶,偶合接枝,静电相互作用

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Abstract:

通过γ-氯丙基三甲氧基硅烷的偶联,将聚乙烯亚胺(PEI)偶合接枝在硅胶微粒表面,制得对铬酸根有强吸附作用的复合型吸附材料PEI/SiO2,并对其化学结构进行了表征;采用静态法研究了PEI/SiO2对铬酸根的吸附性能及脱附性能.结果表明,凭借强烈的静电相互作用,硅胶表面的聚胺大分子PEI对铬酸根阴离子可产生很强的吸附作用,饱和吸附量可达0.07g·g-1(pH=6);等温吸附满足Langmuir吸附等温方程;介质的pH值对吸附作用有很大的影响,pH值愈小,吸附容量愈大;升高温度吸附量减小,表明静电相互作用导致的吸附作用为一放热过程.以NaOH水溶液为洗脱液,吸附在PEI/SiO2表面的铬酸根阴离子很容易被解吸脱附,便于PEI/SiO2的重复使用.

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