环境工程学报2017，Vol.11Issue(11)：5863-5867,5.DOI:10.12030/j.cjee.201703263
多硫化合物还原Cr(Ⅵ)的动力学及其影响因素
Kinetics of Cr(Ⅳ) reduction by polysulfide and its influential factors
摘要
Abstract
Polysulfide has drawn much attention in recent years for remediation of Cr(Ⅵ)-contaminated soil and groundwater systems,due to its stability and persistent reduction ability.The kinetics (order of reaction,reaction rate constant) of the redox reaction between polysulfide and Cr(Ⅵ) were studied.The impact of representative soil minerals (montmorillonite,kaolin,SiO2,Al2O3 and TiO2),humic acid and dissolved oxygen on the reaction kinetics was also investigated.Experimental results showed that,under the anaerobic condition,the rate of this redox reaction can be expressed as r =-d [Cr(Ⅵ)]/dt =kobs [Cr (Ⅵ)]1.1 [S2x-] 0.8 [H +] 1.3,with the apparent kinetic constant kobs being (3.6 ± 3.5) × 1021 L2.2 · (mol2.2 · min)-1 Further experiments indicated that,at 25 ℃ and pH 9.5,the tested minerals did not show significant impact on the reaction kinetics,while humic acid and dissolved oxygen were found to inhibit the rate of chromate reduction by polysulfide.关键词
Cr(Ⅵ)/多硫化合物/反应动力学/矿物质/腐殖酸/溶解氧Key words
Cr(Ⅵ)/polysulfide/reaction kinetics/minerals/humic acid/dissolved oxygen分类
资源环境引用本文复制引用
郭彩阳,石美,张良,刘晓丹,李娟,李佼,邢兴,郑建中..多硫化合物还原Cr(Ⅵ)的动力学及其影响因素[J].环境工程学报,2017,11(11):5863-5867,5.基金项目
国家自然科学基金资助项目(41473098) （41473098）
