不同染料化合物在颗粒活性炭上的分形吸附规律  

FRACTAL ADSORPTION PROPERTIES OF DYE COMPOUNDS ON GRANULAR ACTIVATED CHARCOAL

作　　者：王毅力[1] 杨君[2] 于富玲[1] 刘燕[1] 解明曙[1] 

机构地区：[1]北京林业大学资源与环境学院 [2]北京林业大学生物科学与技术学院,北京100083

出　　处：《环境化学》2005年第3期334-337,共4页Environmental Chemistry

基　　金：国家自然科学基金资助项目(50178009;20407004);霍英东青年教师基金资助项目(91078).

摘　　要：研究了颗粒活性炭对6种染料的吸附特征,结果表明,它们的吸附等温线均符合Frendlich方程;由此计算出颗粒活性炭的表面分形维数均处于2到3之间.不同染料吸附时计算出的分形维数不同,吸附染料过程是在分形表面上发生的反应.吸附动力学过程分为快速吸附和慢吸附两个阶段,而且溶液中剩余染料的浓度变化动力学符合方程:Cout∝t-α,表明该过程具有类分形动力学特征;并由指数α计算上述动力学反应的分形维数D.在实验的温度范围内,6种染料的吸附量和速度均随着温度的升高而增加;绿色染料吸附时的类分形动力学参数指数α和分形维数D也随之升高,而其它染料不呈现类似的规律.In this paper the adsorption properties of six dye compounds on granular activated charcoal were studied. The results showed that their adsorption isotherms could obey Frendlich equation, and the calculated fractal dimensions (D) from Frendlich param ater 1/n were all between 2 and 3, but different values of D were found for different dye compounds. These demonstrated that surface of granular activated charcoal was fractal. The adsorption dynamic process was divided into a fast adsorption step and a slow one. The residual dye concentration in solution varied with adsorption time according to the following relation: C_(out) ∝ t ^(-α), showing that the adsorption dynamic process was a fractal-like one, and the reaction dynamic fractal dimension D could be (determined) through the equation:α=1/(1-1/n). Both the paramater α and fractal dimension D increased with temperature increase when acid green dye adsorbed on granular activated charcoal, but other dye compounds adsorption didn't show the same trend. The adsorption capacity and adsorption rate were higher at higher temperature for all dye compounds.

关 键 词：染料化合物 颗粒活性炭 分形吸附规律 吸附量 速度 类分形动力学 

分 类 号：X788[环境科学与工程—环境工程]