高校化学工程学报Issue(1)：72-77,6.DOI:10.3969/j.issn.1003-9015.2015.01.010
纳米腐植酸对镉离子的吸附热力学及动力学
Thermodynamics and Kinetics of Cadmium Ions Adsorption by Nanoscale Humic Acid
摘要
Abstract
Nanoscale humic acid was prepared by alkali-solution/acid-isolation together with high shearing methods, which was used in the adsorption of cadmium ions. The prepared acid was characterized by means of AFM, FT-IR, SEM and BET, and the static equilibrium adsorption isotherm and adsorption kinetic curves were obtained. The results show that the adsorption process follows the Freundlich isothermal adsorption model. The enthalpy change at temperatures of 288~308 K is 24.22 kJ·mol–1, which suggests that adsorption process is endo-thermic. The adsorption kinetics follows the psendo-second-order equation and the apparent activition energy is 25.58 kJ·mol–1. This result indicates that the adsorption process is chemical reaction controlled rather than diffusion controlled. The adsorption capacity decreases 18.9% after 5 times of acid reusing and this result demonstrates that the adsorbent has good regenerability.关键词
纳米腐植酸/吸附性能/热力学/动力学/镉离子Key words
nanoscale humic acid/adsorption performance/thermodynamics/kinetics/cadmuim ions分类
化学化工引用本文复制引用
程亮,侯翠红,刘国际,张保林..纳米腐植酸对镉离子的吸附热力学及动力学[J].高校化学工程学报,2015,(1):72-77,6.基金项目
“十二五”国家科技计划课题(2011BAD11b05)；郑州大学研究生教育支持基金(201009)。 （2011BAD11b05）
