摘要
为获取马兰黄土对水溶液中Cr(Ⅲ)的吸附机制,深入完善马兰黄土除Cr(Ⅲ)的理论研究,设计了等温吸附、土柱吸附、形态提取和去方解石除Cr(Ⅲ)试验。通过对试验结果的对比分析得出,马兰黄土对水溶液中Cr(Ⅲ)的吸附作用主要为方解石水解所引起的Cr(Ⅲ)吸附沉淀反应和铁锰氧化物对Cr(Ⅲ)的表面络合反应,辅以多种矿物对Cr(Ⅲ)的阳离子交换作用;马兰黄土对水溶液中Cr(Ⅲ)的等温吸附方程较符合非线性Langmuir型等温吸附方程,其吸附动力学模型较符合抛物线扩散方程。
Series of experiments of adsorption of Cr（Ⅲ ） in aqueous solution by Malan Loess were performed to determine the adsorption mechanism. The isothermal adsorption data were well fitted by Langmuir isotherm model, the data obtained from soil column adsorption experiments indicated that adsorption kinetics model accorded with parabolic diffusion equation. The chromium adhered on the surface of the Malan Loess was mainly existed in carbonate combined state and ferric-manganese oxidation combined state, which showed that adsorption was mainly a process of chromium precipitation and coprecipitation induced by calcite hydrolyzing and then was a surface complex reaction by iron-manganese oxide. A few exchange interaction by minerals was also found in Cr（ Ⅲ） adsorption. Adsorption of Cr（ Ⅲ ） by non-calcites Malan Loess indicated that calcite play a predominant role for Cr（ Ⅲ ） adsorption.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2009年第6期19-22,25,共5页
Environmental Pollution & Control
基金
国家自然科学基金资助项目(No.40402021)
中国地质大学(武汉)优秀青年教师资助计划项目(No.CUGQNL0303)
