离子液体负载沸石吸附除砷及其影响因素.doc

离子液体负载沸石的吸附除砷及其影响因素
彭长宏, 朱云, 余芳
(中南大学冶金科学与工程学院,湖南长沙,410083)
摘要:研究了离子液体负载型沸石吸附剂CR-Z和BU-Z对溶液中As(III)和As(V)的吸附去除性能及影响因素。结果表明,CR-Z和BU-Z对As(III)和As(V)具有较强的吸附能力,对As(V)的吸附容量优于As(III)。CR-Z和BU-Z对As(III)和As(V)的吸附属快速动力学,符合拟二级动力学方程。Langmuir方程和Freundlich方程均可表征CR-Z和BU-Z对砷的吸附热力学。CR-Z和BU- mg/ mg/g, mg/ mg/g。溶液pH值显著影响CR-Z和BU-Z吸附除砷能力。循环再生的CR-Z和Z对As(V)吸附均呈现先递减后稳定的趋势,且CR-Z对砷的吸附容量大于Z对砷的吸附容量。
关键词:离子液体;沸石;吸附;除砷
中图分类号: 文献标志码:A
Removal of arsenic and its influencing factors by zeolite
adsorbents loaded with ionic liquid
PENG Chang-hong, ZHU Yun, YU Fang
(School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China)
Abstract: The removal performance and its influencing factors on arsenic by zeolite adsorbents loaded with ionic liquid (referred to as CR-Z and BU-Z) were studied using the static method and the dynamic method. The results showed that CR-Z and BU-Z has a strong adsorption capacities for As(III) and As(V) and the adsorption capacity of As(V) was higher than that of As(III). CR-Z and BU-Z has fast absorption ics for arsenic and their adsorption performances are in accordance with the second-order ics equation. The adsorption thermodynamics for arsenic by CR-Z and BU-Z could be characterized with Langmuir equation and the Freundlich equation. The breakthrough adsorption capacities of CR-Z and BU-Z f