| 腐殖酸钛盐对铀(VI)的吸附动力学与热力学研究 |
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| 引用本文： | 张园园,吕俊文,邓晨阳,董雪洁,房琦.腐殖酸钛盐对铀(VI)的吸附动力学与热力学研究[J].南华大学学报(自然科学版),2019,33(3):21-27. |
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| 作者姓名： | 张园园 吕俊文 邓晨阳 董雪洁 房琦 |
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| 作者单位： | 南华大学 资源环境与安全工程学院,湖南 衡阳 421001,南华大学 资源环境与安全工程学院,湖南 衡阳 421001;衡阳市土壤污染控制与 修复重点实验室,湖南 衡阳 421001,南华大学 资源环境与安全工程学院,湖南 衡阳 421001,南华大学 资源环境与安全工程学院,湖南 衡阳 421001,南华大学 资源环境与安全工程学院,湖南 衡阳 421001;衡阳市土壤污染控制与 修复重点实验室,湖南 衡阳 421001 |
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| 基金项目： | 国家自然科学基金资助项目(11275092) |
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| 摘 要： | 为了了解腐殖酸钛盐对铀在土壤中迁移的影响,本研究通过一系列静态吸附实验,开展了在不同pH、接触时间、温度和初始铀质量浓度等条件下,腐殖酸钛盐对铀(VI)的吸附研究,并进行了动力学和热力学分析。实验结果表明溶液pH值和初始铀质量浓度是影响腐殖酸钛盐吸附铀(VI)的重要因素,吸附量随着初始铀质量浓度的增加而增大,且在pH=6时吸附效果最佳,吸附量为34.75 mg/g,吸附平衡时间约为90 min。腐殖酸钛盐对铀的吸附动力学符合准二级动力学模型,即吸附主要是化学吸附。吸附热力学研究发现腐殖酸钛盐对铀的吸附符合Freundlich模型,表明吸附是多层吸附;腐殖酸钛盐对铀的吸附是一个自发的吸热过程,即温度升高有利于吸附作用。
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| 关 键 词： | 铀 腐殖酸钛盐 吸附 动力学 热力学 |
| 收稿时间： | 2019/1/17 0:00:00 |
Adsorption Kinetics and Thermodynamics of Uranium(VI) by Humic Acid Titanium Salt |
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| Affiliation: | School of Resource & Environment and Safety Engineering,University of South China, Hengyang,Hunan 421001,China,School of Resource & Environment and Safety Engineering,University of South China, Hengyang,Hunan 421001,China;Hengyang Key Laboratory of Soil Contamination Control and Remediation,Hengyang,Hunan 421001,China,School of Resource & Environment and Safety Engineering,University of South China, Hengyang,Hunan 421001,China,School of Resource & Environment and Safety Engineering,University of South China, Hengyang,Hunan 421001,China and School of Resource & Environment and Safety Engineering,University of South China, Hengyang,Hunan 421001,China;Hengyang Key Laboratory of Soil Contamination Control and Remediation,Hengyang,Hunan 421001,China |
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| Abstract: | In order to understand the effect of humic acid titanium salt on uranium(VI) migration in soil,uranium adsorption was studied under different pH value,contact time,temperature and initial uranium concentration through a series of batch experiments,and the adsorption kinetic and thermodynamic analysis were carried out.The results showed that the pH value of the solution and the initial uranium concentration were important factors affecting the adsorption.When pH=6,the humic acid titanium salt had the best adsorption performance for uranium,and the adsorption amount was 34.75 mg/g.The adsorption equilibrium time was about 90 minutes.The uranium adsorption by humic acid titanium salt conformed to the quasi-secondary kinetic model,which the adsorption was mainly chemical adsorption.The adsorption thermodynamics was more in line with the Freundlich model,indicating the adsorption was multilayer adsorption;uranium adsorption by humic acid titanium salt was a spontaneous endothermic process,that is,the temperature rise was favorable for adsorption. |
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| Keywords: | uranium humic acid titanium salt adsorption kinetics thermodynamics |
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