摘要
通过研究pH值、吸附时间、温度、离子浓度及腐殖酸(HA)浓度等因素影响KOH活化增强多壁碳纳米管(MWCNTs)制备的K-MWCNTs对双氯芬酸(DCF)的吸附特性.结果表明,K-MWCNTs质量浓度为 400 mg/L时,吸附量约提升 5 倍;pH值为 5.0 时存在最大吸附量(82.0 mg/g);吸附平衡时间符合准二级动力学模型;吸附等温线符合Langmuir模型;强离子浓度与HA抑制吸附;K-MWCNTs吸附涉及静电作用、π-π键及范德华力等作用,可用于水体中DCF的高效去除.
Abstract
Multi-walled carbon nanotubes(MWCNTs)were activated by KOH to make a new adsorbent K-MWCNTs,and the adsorption characteristics of the adsorbent on diclofenac(DCF)in water were studied under different pH,contact time,temperature,ionic strength and humic acid(HA)concentration.The results showed that K-MWCNTs the adsorption capacity of K-MWCNTs was improved about 5 times with dosage of adsorbent was 400 mg/L,compared with MWCNTs;The adsorption reached the maximum(82.0 mg/g)when pH was 5.0;The adsorption equilibrium was more consistent with the pseudo-second-order kinetics model.Langmuir model could be better described the adsorption isotherm.The adsorption of DCF onto K-MWCNTs was inhibited by high concentration of ion and HA.The adsorption process of K-MWCNTs mainly involves electrostatic interaction,π-π bond and Van der Waals force,which could be used for efficient removal of DCF in groundwater:model.Langmuir model could be better described the adsorption isotherm.The adsorption of DCF onto K-MWCNTs was inhibited by ionic strength and humic acid.The adsorption process mainly involves electrostatic interaction,π-π bond and Van der Waals force.
基金项目
上海市"科技创新行动计划"科技小巨人工程项目(220HX 014700)
NETL
NSTL
万方数据