高铁酸钾辅助土壤吸附Cu^(2+)的性能及影响因素  

Properties and influencing factors of soil adsorption of Cu^(2+) with potassium ferrate assisted

作　　者：潘萌[1] 崔建国[1] 张峰[1] 樊鹏跃 

机构地区：[1]太原理工大学环境科学与工程学院,太原030024

出　　处：《环境工程学报》2016年第5期2693-2699,共7页Chinese Journal of Environmental Engineering

基　　金：山西省青年科技研究基金资助项目(2013021011-8);太原理工大学校青年基金(2013T082;2012L030)

摘　　要：研究了汾河边砂壤土(A土)和细砂土(B土)在不同影响因素下对Cu^(2+)的吸附特性,对比2种原土和加入高铁酸钾后对水相中Cu^(2+)的吸附动力学和热力学参数。结果表明,B土有机质含量比A土高,其对Cu^(2+)的吸附量大于A土。高铁酸钾的加入对土壤吸附Cu^(2+)有显著效果,最佳吸附条件为A土和B土加入K2Fe O4的Fe/Cu质量比分别为20∶1和5∶1,p H=8~10,T=35℃,此时A土、B土、加入K2Fe O4的A土、加入K2Fe O4的B土的最大吸附量分别为0.36、0.41、0.41和0.46 mg/g。A土和B土对Cu^(2+)的吸附过程满足Freundlich方程,吸附能力大小为:加入K2Fe O4的B土>加入K2Fe O4的A土>B土>A土。吸附热力学表明,该吸附是自发吸热过程,吸附动力学满足准二级动力学模型,表明土壤A和B对Cu^(2+)吸附是以多层吸附为主,同时存在物理和化学吸附过程。In the loam（ A） and fine sand soil（ B） on the shore of the Fenhe River,Cu^（2＋）adsorption properties and factors that influence absorption were studied. We compared the adsorption kinetics and thermodynamic parameters of Cu^（2＋）in aqueous solution in the two kinds of original soil,as well as in these soils following the addition of potassium ferrate. The results indicated that the organic matter content in B soil was higher than that in A soil. Thus,the adsorption capacity of Cu^（2＋）B soil was greater than that of A soil. The addition of potassium ferrate had a significant effect on the soil adsorption of Cu^（2＋）. The best conditions occurred when the Fe / Cu mass ratios of soil A and soil B were 20 ∶ 1 and 5 ∶ 1,respectively（ p H form 8 to 10,T = 35 ℃）. The maximum adsorption of soil A,soil B,soil A（ ＋ K2 Fe O4）,and soil B（ ＋ K2 Fe O4） were 0. 36,0. 41,0. 41 and 0. 46 mg /g,respectively. The process of Cu^（2＋）adsorption by soil A and soil B satisfied the Freundlich equation; the size order of the adsorption capacity was： soil B（ ＋ K2 Fe O4） 〉soil A（ ＋ K2 Fe O4） soil B 〉soil A. Adsorption thermodynamics indicated that adsorption was a spontaneous and endothermic process,and adsorption kinetics could be best described by a pseudo second-order kinetic model,indicating that the adsorption of Cu^（2＋）by soil A and soil B was dominated by multilayer adsorption,and the physical and chemical adsorption processes existed simultaneously.

关 键 词：高铁酸钾 土壤 吸附 CU2+ 

分 类 号：X53[环境科学与工程—环境工程]