椰壳活性炭对水中N-DBP前体物的吸附  

Adsorption of N-DBP precursor substance in water using cocoanut shell activated carbon

作　　者：张一凡[1,2] 金腊华[1,2] 周元[1,2] 

机构地区：[1]暨南大学环境学院,广州510632 [2]广东省高校水土环境毒害性污染物防治与生物修复重点实验室,广州510632

出　　处：《环境工程学报》2015年第9期4353-4358,共6页Chinese Journal of Environmental Engineering

基　　金：东莞市高校科研机构科技计划项目(2012108101002)

摘　　要：以椰壳活性炭为吸附剂进行了模拟水样中的N-DBP前体物——天冬氨酸的吸附去除实验,考察了吸附时间和溶液pH对吸附效果的影响,分析了吸附等温线、吸附动力学特征以及吸附热力学相关参数。实验结果表明,在不同的投加量下,椰壳活性炭对DON的吸附均在180 min时达到平衡;升高或降低水样的pH会使吸附量显著下降;椰壳活性炭对天冬氨酸的吸附过程符合准二级动力学方程和Langmuir方程(R2>0.99);膜扩散及内扩散阶段为吸附的控制阶段;在303 K的温度下,椰壳活性炭对天冬氨酸的最大吸附量为8.33 mg/g。对热力学结果的分析表明,该吸附反应是放热反应,在常温常压下不能自发反应。Cocoanut shell activated carbon was used as adsorbent for adsorption of asparagic acid—a NDBP precursor. In this study,the effects of adsorption time and solution pH on the adsorption capacity of cocoanut shell activated carbon were investigated. The parameters of adsorption isotherms,adsorption kinetics and thermodynamic were analyzed. The results show that the adsorption reached equilibrium after 180 min under different dosages. The change of pH would lead the significant decrease of adsorption capacity. The performance of the activated carbon in adsorbing asparagic acid followed the the pseudo-second order adsorption kinetics and Langmuir equations of adsorption isotherm（ R2 0. 99）. And the phases of film diffusion and internal diffusion were the control phases of adsorption. The maximum adsorption capacity was found to be 8. 33 mg/g at 303 K.The analysis of thermodynamic indicates that the adsorption reaction was exothermic and it couldn＇t react spontaneously under normal temperature and pressure.

关 键 词：椰壳活性炭 N-DBP前体物 天冬氨酸 DON 吸附 

分 类 号：X703.5[环境科学与工程—环境工程]