Kinetic Study for Adsorption Humic Acid on Soil Minerals

被引：75
作者：
Shaker, Ali M. [2 ]
Komy, Zanaty R. [2 ]
Heggy, Said E. M. [1 ]
El-Sayed, Mohamed E. A. [1 ]
机构：
[1] Agr Res Ctr, Soil Water & Environm Res Inst, Cairo, Egypt
[2] Sohag Univ, Dept Chem, Fac Sci, Sohag, Egypt
来源：
JOURNAL OF PHYSICAL CHEMISTRY A | 2012年 / 116卷 / 45期
关键词：
ORGANIC-MATTER; WATER; PARTICLES; DYES; PH; EQUILIBRIUM; ALPHA-FE2O3; MECHANISMS; KAOLINITE; CHITOSAN;
D O I：
10.1021/jp3078826
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Kinetics of humic acid (HA) adsorption onto soil minerals (kaolinite and hematite) has been investigated under various conditions. The influence of ionic strength, pH, and solution cations on the rate of adsorption has been studied. The rate and the amount of adsorbed humic acid onto soil minerals increased with increasing ionic strength, decreasing pH, and in the presence of Ca2+ as background electrolyte. The adsorption equilibrium data showed that adsorption behavior of humic acid could be described more reasonably by Freundlich adsorption isotherm than Langmiur adsorption isotherm Pseudo first order and pseudo second order kinetic models were used to evaluate the kinetic data and the rate constants. The results explained that humic acid adsorption on hematite and kaolinite was more conforming with pseudo second order kinetics.
引用
收藏
页码：10889 / 10896
页数：8
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