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环境化学  2015 

开放系统下丙二酸在方解石上的吸附

Keywords: 丙二酸,方解石,吸附,动力学,等温吸附

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Abstract:

通过批量平衡法,研究开放系统条件下方解石对丙二酸的吸附特性.结果表明,丙二酸在方解石上的吸附先快后慢,3h后渐趋平衡;当pH值从7.7增加到9.7时,丙二酸的吸附率逐渐降低,HCO3-和CO32-的竞争效应及方解石表面的静电效应是其主导因素;同一初始浓度下,与开放系统条件比较,半封闭系统条件下丙二酸的吸附量显著降低,推测其原因是半封闭系统中OH-的竞争作用.丙二酸与邻苯二甲酸的等温吸附结果对比发现,丙二酸的吸附能力较邻苯二甲酸更强,丙二酸的等温吸附过程符合Langmuir模型,而邻苯二甲酸的等温吸附过程更符合Freundlich模型,推测以上差异是由两羧基之间的分子结构不同引起的.

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