期刊
APPLIED CLAY SCIENCE
卷 38, 期 1-2, 页码 51-56出版社
ELSEVIER
DOI: 10.1016/j.clay.2007.02.011
关键词
humic acid; bentonite; adsorption; adsorption isotherms
Isotherms of adsorption of Azraq humic acid (HA) onto Azraq bentonite were studied at different pH (3.0 - 6.0) and temperature values. The Langmuir monolayer adsorption capacity (q(m)) was found to be 53 mg HA/g raw bentonite at pH=3.0 and 25 degrees C, Delta H degrees=54.8 kJ/mol, Delta S degrees=220 J/mol deg which were approximate to those reported for the adsorption of HA on kaolinite. In the case of bentonite, the q(m) and Langmuir constant (K-L) values are significantly greater than those reported for zeolite. These results indicate the importance of sheet structure of bentonite in the adsorption process. Treatment of raw bentonite with NaCl, CH3COOH and HCOOH does not affect adsorptivity (q(m) and K-L) of HA on bentonite, while treatment with HCI causes great decrease in adsorptivity. The adsorptivity of HA on bentonite was found to be inversely proportional to the increase in pH because of the increase in repulsion between HA and bentonite. (c) 2007 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据