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红壤-钼吸附过程及机制研究

发表时间:2015-12-31  浏览量:1671  下载量:515
全部作者: 曾智浩,王果,王明光
作者单位: 福建农林大学资源与环境学院
摘 要: 通过批量实验研究不同初始钼酸根(MoO42-)浓度和竞争离子对红壤-钼吸附过程的影响,采用动力学方程和等温吸附模型探讨红壤-钼的吸附过程与吸附情况。结果表明,红壤对MoO42-的吸附量随初始浓度升高而增大;共存阴离子与MoO42-在红壤上存在竞争吸附,其影响顺序为PO43->SeO32->SO42->Cl->NO3-. 红壤-钼吸附过程可以采用LJ方程和准一级动力学方程描述。实验浓度范围内,吸附等温线最符合Freundlich模型。推测红壤-钼吸附是一个物理吸附和化学吸附均占一定比例的复杂过程。
关 键 词: 土壤环境学;等温模型;动力学方程;MoO42-;土壤
Title: Adsorption of molybdate on red soil and mechanism study
Author: ZENG Zhihao, WANG Guo, WANG Mingguang
Organization: Through batch experiments, we study the molybdenum adsorption process on the red soil with different initial concentrations and competitive anions. And, using kinetic equations and isothermal adsorption models, we analyze the mechanism of adsorption. The results show that molybdenum adsorption on red soil increases with the increasing initial concentrations. Anionic competitive adsorption with follows the order as: > > > Cl? > . Mo kinetic adsorption processes follow the LJ and pseudo-first order kinetics equations. In the range of experimental concentration, soil-molybdenum adsorption isotherm fits the Freundlich model. We conclude that molybdate adsorption on red soil may be a complex adsorption process with both chemical reaction and physical adsorption.
Abstract: Through batch experiments, we study the molybdenum adsorption process on the red soil with different initial concentrations and competitive anions. And, using kinetic equations and isothermal adsorption models, we analyze the mechanism of MoO42- adsorption. The results show that molybdenum adsorption on red soil increases with the increasing initial MoO42- concentrations. Anionic competitive adsorption with MoO42- follows the order as: PO43->SeO32->SO42->Cl->NO3-. Mo kinetic adsorption processes follow the LJ and pseudo-first order kinetics equations. In the range of experimental concentration, soil-molybdenum adsorption isotherm fits the Freundlich model. We conclude that molybdate adsorption on red soil may be a complex adsorption process with both chemical reaction and physical adsorption.
Key words: soil environmentology; isothermal model; kinetics equation; MoO42-; soil
发表期数: 2015年12月第24期
引用格式: 曾智浩,王果,王明光. 红壤-钼吸附过程及机制研究[J]. 中国科技论文在线精品论文,2015,8(24):2587-2592.
 
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