碳纳米管负载离子液体对铜离子吸附研究

采用浸渍法将手性离子液体1-乙基-3-甲基咪唑L-酒石酸盐(EMIML-Tar)负载到羧基化多壁碳纳米管(CNTs)上,对水溶液中Cu~(2+)进行吸附,考察了离子液体加入量、EMIML-Tar/CNTs吸附剂用量、Cu~(2+)初始浓度、pH、吸附温度、吸附时间对吸附性能的影响。结果表明,负载离子液体后能显著提高多壁碳纳米管对Cu~(2+)的吸附能力,当Cu~(2+)初始浓度为20 mg/L,吸附剂用量为25 mg,溶液pH为6.0,吸附温度为298 K,吸附时间为30 min时,EMIML-Tar/CNTs吸附剂对Cu~(2+)去除率达96%,吸附量为19.19 mg/g。应用2种动力学模型对吸附过程进行拟合,结果表明吸附过程可以很好地用准一级动力学方程描述。

ADSORPTION ON Cu2+ BY CARBON NANOTUBES COATED WITH IONIC LIQUIDS

Chiral ionic liquid 1-ethyl-3-methyl imidazole L-tartrate (EMIML-Tar) was supported on carbon nanotubes (CNTs) by impregnation method, and its adsorption on Cu²⁺ in the solution was observed. The effects of the dosage of ionic liquid, EMIML-Tar/CNTs adsorbent dosage, Cu²⁺ initial concentration, pH of the solution, adsorption temperature and adsorption time on Cu²⁺ adsorption were investigated. The results showed that the EMIML-Tar/CNTs were more effective obviously compared with the base CNTs, the Cu²⁺ removing rate of EMIML-Tar/CNTs could reached 96%, the adsorption capacity was 19.19 mg/g under the condition of the initial Cu²⁺ concentration of 20 mg/L, the adsorbent amount of 25 mg, pH 6.0, adsorption temperature of 298 K, adsorption time of 30 min. Two kinds of dynamic models were used to simulate adsorption kinetics, the results showed that the adsorption process better followed a pseudo-first order equation.