摘要
本文研究了土壤、矿物对Cr(Ⅵ)的吸附机制,结果表明:土壤中铝对Cr(Ⅵ)的吸附起着主要作用,土壤、矿物对Cr(Ⅵ)的吸附机制和磷酸根相似,以专性吸附为主,吸附过程中伴随着羟基的释放,溶液中磷酸根、氟离子和硫酸根等阴离子的存在,强烈抑制了土壤、矿物对Cr(Ⅵ)的吸附,而C1^-和NO_3^-的影响较小。
The adsorption of Cr (Ⅵ) by soils and minerals was studied. Results showed that aluminium was the main fatter affecting the adsorption of Cr (Ⅵ). The mechanism of the adsorption of Cr (Ⅵ) by geothite and soils was somewhat similar to that of phosphate Basically, Cr (Ⅵ) was adsorbed through specific adsorption and could not be desorbed by Cl^- and NO_3^-. Cr (Ⅵ) adsorbed by geothite released-OH group. There was a significant correlation between the amount of Cr (Ⅵ) adsorbed and pH in geothite suspension. As the ionic strength of the solution increased the amounts of Cr (Ⅵ) adsorbed by minerals and soils decreased. The adsorption of Cr (Ⅵ) was greatly depressed in the presence of SO_4^(2-), WO_4~2, MoO_4~2, HPO_4^(2-), and H_2PO_4^-, which competed for anion adsorption sites.
出处
《农业环境保护》
CSCD
1993年第4期150-152,共3页
Agro-Environmental Protection
