高分子除氯剂对水中氯离子的吸附机理

采用高分子除氯剂吸附水中的氯离子,考察了除氯剂投加量、反应时间、反应温度、竞争离子等对氯离子去除率的影响。实验结果表明:随着除氯剂投加量增加,氯离子去除率不断提高;吸附动力学符合拟二级动力学模型,表明化学吸附可能是氯离子吸附过程的速率控制步骤;Elovich模型表明除氯剂表面吸附的氯离子存在非均相扩散的吸附-脱附过程;Freundlich等温吸附模型能更好地描述吸附过程,结合热力学计算表明该过程是一个自发进行的吸热熵增的化学吸附过程,温度越高自发程度越大。

Adsorption mechanism of polymer dechlorination agent to chloride ion in water

Chloride ions were adsorbed from water using the polymer dechlorination agent. The factors affecting the removal rate of chloride ion were studied,such as：dechlorination agent amount,reaction time,reaction temperature,competing ions,and so on. The experimental results showed that：The removal rate of chloride ion increased with the increase of dechlorination agent amount;The adsorption kinetics followed the pseudo-second-order model,which suggested that chemical adsorption may be the rate control step of chloride adsorption process;The Elovich model indicated that the adsorption of chloride ion on the surface of dechlorination agent was an adsorption-desorption process with heterogeneous diffusion;The Freundlich isothermal adsorption model described the adsorption process better,and the thermodynamic calculation results showed that the process was a spontaneous endothermic and entropy-increasing chemical adsorption process which was enhanced with the increase of temperature.