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六氯苯在黄泥土表面吸附的动力学特征
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摘要:
采用动力学方法研究了六氯苯在黄泥土表面的吸附特征.结果表明,六氯苯在黄泥土表面的吸附量随着六氯苯吸附时间的延长而增加,并且在开始增加的速率较快,而后逐渐减缓,表现出明显的快反应和慢反应两阶段特征.六氯苯在土壤表面的吸附在192 h(8 d)基本可达到表观平衡,其吸附的动力学过程可以用一级动力学方程、Elovich方程和双常数方程进行很好的拟合,其相关系数(r)在0.90~0.98之间,达到显著水平.六氯苯在土壤表面的吸附以Elovich方程为最佳模型,其次为一级动力学方程和双常数方程,这说明六氯苯在土壤表面的吸附过程由表面吸附和内部扩散两个部分组成.
关键词:  六氯苯  吸附特征  土壤表面  动力学过程
DOI:
修订日期:2006-07-13
基金项目:国家自然科学基金 , 安徽省自然科学基金 , 安徽省高校青年教师科研项目 , 安徽省农产品安全重点实验室基金
Kinetic sorption characteristics of hexachlorobenzene on Huangni soil surfaces
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Abstract:
Kinetic sorption characteristics of hexachlorobenzene (HCB) on Huangni soil surfaces were investigated by using the kinetic experimental methods.The results indicate that,the amount of HCB adsorbed on soils surfaces were gradually increased as the sorption time prolonged.Sorption rates of HCB on Huangni soils were shown to be biphasic,generally involving a fast initial step,followed by a very low sustained approach to apparent equilibrium.In kinetic experiments,apparent sorption equilibrium was reached in eight days,and kinetic curve could be fitted by Elovich equation,dual constant equation and first order kinetic equation.The correlation coefficient(r) ranged from 0.90 to 0.98.Data fitted by Elovich equation was better than by dual constant equation and first order equation,which indicated energy distributions of HCB adsorption onto the soil surface were nonhomogeneous,and the process of HCB adsorbed onto soil involving surfaces sorption and intraparticle diffusion.
Key words:  hexachlorobenzene,sorption characteristics,soil surface,kinetic process

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