Liang Ruijie, Chen Bingren^*
(Department of Chemistry, South China Normal University, Guangzhou 510631)

Abstract The effects of ionic strength of NaCl and temperature on the adsorption behavior of anionic dye (Acid chrome blue K) on activated carbon which presents a negative surface charge in aqueous solution were studied by flow injection-spectrophotometry. The results show that the rise of ionic strength increases the rate of dye adsorption through reducing adsorption activation energy, moreover, thermodynamically, the change in free energy of adsorption decreases from positive to negative with increasing ionic strength at each temperature investigated, but the changes in enthalpy and entropy of adsorption are positive and both increase with the incseasig ionic strength. On the other hand, the mechanisms of the effects of ionic strength and temperature were discussed in adsorption kinetic and thermodynamic aspects.
Key words Flow injection-spectrophotometry, Adsorption, Ionic strength, Temperature, Activated carbon, Anionic dye

梁锐杰 陈炳稔^*
(华南师范大学化学系 广州 510631)

摘 要 运用流动注射分光光度法，考察了在不同离子强度介质(NaCl)与温度下，水溶液中表面带负电的活性炭吸附阴离子染料酸性铬蓝K的行为。结果表明，离子强度的增大降低了吸附的活化能，在动力学上起到加速吸附的作用；在热力学上，各个温度下的吸附自由能变化均随着离子强度的增大而从正值转变为负值，吸附焓变与吸附熵变皆为正值并随着离子强度的增大而增大。结合这些动力学与热力学参数，初步解释了离子强度与温度对吸附的影响。
关键词 流动注射分光光度法 吸附 离子强度 温度 活性炭 阴离子染料

梁锐杰 男，25岁，硕士生，现从事吸附分离方面的研究。* 联系人
2003-08-23收稿，2003-11-28收稿

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