摘要
利用一次平衡法,研究红壤和黄土对Tl+吸附的热力学和动力学过程。结果表明,在试验所采用的Tl+浓度范围内,红壤和黄土对Tl+的吸附量均随着加入浓度的增加而增加,但是黄土对Tl+的吸附能力明显高于红壤。2种土壤对Tl+的吸附等温线用Langmuir方程拟合效果最好。红壤吸附Tl+很快,20min左右基本达到平衡。而随着初始浓度的提高,黄土对Tl+的吸附达到吸附平衡所需的时间增长,在最大浓度(15mg/L)时约120min达到吸附平衡。2种土壤对Tl+吸附动力学过程用双常数方程拟合效果最好。
The thermodynamics and kinetics of thallium adsorption by red soil and loess were studied with once balance method.The study showed that the adsorption of Tl ＋ by two soils was increased with the increasing concentration of Tl ＋ within the range of Tl ＋ concentrations used in the experiment,but the amount of Tl ＋ adsorbed on loess was higher than that on red soil.Langmuir equation was the optimal model to describe the adsorption of Tl ＋ by the soils.The adsorption of red soil was very rapid,which could reach its balance after 20 min.The adsorption of Tl ＋ by loess was very rapid at low concentrations.As the concentration increased,reaching its balance required more time.The balance would be reached in 120 min at the maximum concentration of 15 mg/L.Two-constant equation was the optimal model to describe the adsorption kinetics process of Tl ＋ by red soil and loess.
出处
《安徽农业科学》
CAS
北大核心
2011年第21期12747-12749,12852,共4页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金青年基金项目(40903044)
中国博士后科学基金项目(20080430847)
国家自然科学基金委员会-广东省人民政府联合基金项目(U0633001)
中央级公益性科研所公益基金项目(Zx-200809-09)
关键词
T1+
红壤
黄土
吸附
热力学
动力学
Tl ＋
Red soil
Loess
Adsorption
Thermodynamics
Kinetics
