钢渣对亚铁离子和硫离子的吸附-解吸特性  

Adsorption-desorption characteristics of steel slag for ferrous and sulfur ions

作　　者：谢晓梅[1] 廖敏[1] 华嘉媛 陈娜[1] 张楠[1] 徐培智[2] 解开治[2] 徐昌旭[3] 刘光荣[3] 

机构地区：[1]浙江大学环境与资源学院,浙江省亚热带土壤与植物营养重点研究实验室,杭州310058 [2]广东省农业科学院土壤肥料研究所,广州510640 [3]江西省农业科学院土壤肥料与资源环境研究所,南昌330200

出　　处：《浙江大学学报（农业与生命科学版）》2015年第4期465-475,共11页Journal of Zhejiang University:Agriculture and Life Sciences

基　　金：国家公益性行业(农业)科研专项(201003059)

摘　　要：采用静态批式法研究钢渣对亚铁离子（Fe2＋）和还原态硫离子（S2-）的吸附行为,探讨溶液pH、环境温度及溶液离子强度对钢渣吸附Fe2＋和S2-特性的影响,并进一步通过解吸试验了解钢渣吸附态Fe2＋和S2-的稳定性.结果表明：钢渣吸附Fe2＋和S2-的动力学过程均符合Elovich动力学模型,相关系数分别为0.94和0.89;Fe2＋和S2-在钢渣上等温吸附特征能较好地用Freundlich等温吸附模型表达,相关系数分别为0.97和0.94;钢渣对Fe2＋和S2-的吸附为非优惠型吸附,其中对Fe2＋的吸附为非自发反应,对S2-的吸附为自发反应;钢渣对Fe2＋和S2-的吸附过程主要为化学吸附,是一个吸热过程,高温有利于吸附作用的进行;钢渣对Fe2＋的吸附以内层配位为主,对S2-的吸附以外层络合为主;钢渣具有较大的pH适应性,一定范围内的pH （1.50~11.50）变化对钢渣吸附Fe2＋和S2-影响不大;同时,随着离子强度的增加钢渣对Fe2＋的吸附量变化不明显, 但对S2-的吸附量显著减少.总之,钢渣吸附态Fe2＋和S2-具有较好的稳定性,在不同pH条件及离子强度下吸附的Fe2＋和S2-解吸率很低,说明钢渣可作为Fe2＋和S2-良好的吸附材料加以利用.Summary Ferrous ion （Fez＋） and reduced sulfur ion （S2 ） were main toxic elements in the cold waterlogged paddy soil. How to remove Fe2＋ and S2- effectively was the key to improve the quality of cold waterlogged paddy soil. Steel slag has been confirmed as a good sorption material in waste water treatments for some heavy metals and organic pollutants. These properties suggested that steel slag might have the ability to adsorb and fix Fez＋ and S2 from cold waterlogged paddy soil, and improve the quality of cold waterlogged paddy soil by reducing Fe2＋ and S2- The characteristics of Fe2＋ and S2- adsorption-desorption by steel slag were studied in the present study, to reveal whether steel slag was a good sorption material for Fe2＋ and S2- , and to understand whether steel slag had the potentiality in controlling Fe2＋ and S2- and improving the quality of cold waterlogged paddy soil. The sorption of Fe2＋ and S2- by steel slag was studied using batch incubation experiments, while the effects of adsorption time （0.25, 0.5, 1, 1.5, 2, 3 or 4 h, respectively）, Fe2＋ and S2- concentration （10, 30, 50, 100, 150 mg/L Fe2＋ or 10, 30, 50, 80, 100 mg/L S2- , respectively）, pH （the pH range of adsorption system was from 1.00 to 12.00）, temperature （designed as 15, 25, 35 or 45 ＊C, respectively） and ionic strength （0.01 mol/L NaC1, 0.02 mol/L NaC1 or 0. 005 mol/L MgC12, respectively） in adsorption reaction solution on the sorption were investigated. Except for adsorption time experiments, all treatments were shook 3 h and stood for one night for complete adsorption reaction. Then, the adsorption reaction solution was centrifuged at 4 000 r/min for 10 min and filtrated for further determination of Fez＋ and S2- concentrations. The stability of Fe2＋ and S2- adsorbed by steel slag was further validated by desorption experiments under similar conditions. The results showed that the adsorption kinetics of Fe2＋ and S2 by steel slag followed the Elovich kinetics equation, and the c

关 键 词：钢渣 亚铁离子 还原态硫离子 吸附剂 

分 类 号：X756[环境科学与工程—环境工程] S156.99[农业科学—土壤学]