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浙江大学学报(农业与生命科学版)
论文     
钢渣对亚铁离子和硫离子的吸附-解吸特性
谢晓梅1, 廖敏1*, 华嘉媛1, 陈娜1, 张楠1, 徐培智2, 解开治2, 徐昌旭3, 刘光荣3
(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)
Adsorption-desorption characteristics of steel slag for ferrous and sulfur ions
Xie Xiaomei1, Liao Min1*, Hua Jiayuan1, Chen Na1, Zhang Nan1, Xu Peizhi2, Xie Kaizhi2, Xu Changxu3, Liu Guangrong3 
(1. Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China; 2. Institute of Soil &Fertilizer, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; 3. Institute of Soil & Fertilizer and Resource & Environment, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China)
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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.
Abstract: Ferrous ion (Fe2+) 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 Fe2+ 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 ℃, respectively) and ionic strength (0.01 mol/L NaCl, 0.02 mol/L NaCl or 0.005 mol/L MgCl2, 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 Fe2+ 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 correlation coefficients were 0.94 and 0.89 respectively. Freundlich isotherm model could simulate the adsorption processes better than other models, and the correlation coefficients for Freundlich isotherm model were 0.97 and 0.94 respectively. Their parameters were all less than 1, which indicated that the adsorption processes were nonpreferential adsorption. Free energy variation (ΔG) for the Fe2+ sorption was greater than 0, which indicated that this reaction was non-spontaneous; but ΔG for the S2- sorption was less than 0, which indicated that this reaction was spontaneous. The adsorption process was endothermic because high temperature was beneficial to their adsorption. And the adsorption process had greater pH adaptability range from 1.50 to 11.50. The adsorption of Fe2+ was major in inner sphere complexation, while the adsorption of S2- was major in outer complexation, which were consistent with the results in thermodynamic experiments. The adsorption rates were all very high, but the desorption rates were low in all experimental conditions, which showed that the adsorption stability of steel slag was superior. 
On the whole, steel slag had good ability to remove Fe2+ and S2-, might be a potential adsorbent in controlling Fe2+ and S2- and improving the quality of cold waterlogged paddy soil.
出版日期: 2015-04-10
CLC:  X 756  
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刘光荣
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陈娜
张楠
谢晓梅
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华嘉媛
谢晓梅
廖敏
华嘉媛
陈娜
张楠
徐培智
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徐昌旭
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引用本文:

谢晓梅, 廖敏, 华嘉媛, 陈娜, 张楠, 徐培智, 解开治, 徐昌旭, 刘光荣. 钢渣对亚铁离子和硫离子的吸附-解吸特性[J]. 浙江大学学报(农业与生命科学版), 10.3785/j.issn.1008-9209.2014.05.131.

Xie Xiaomei, Liao Min, Hua Jiayuan, Chen Na, Zhang Nan, Xu Peizhi, Xie Kaizhi, Xu Changxu, Liu Guangrong . Adsorption-desorption characteristics of steel slag for ferrous and sulfur ions. Journal of Zhejiang University (Agriculture and Life Sciences), 10.3785/j.issn.1008-9209.2014.05.131.

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http://www.zjujournals.com/agr/CN/10.3785/j.issn.1008-9209.2014.05.131        http://www.zjujournals.com/agr/CN/Y0/V/I/1

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