羟乙基纤维素/海藻酸钠复合膜对六价铀的吸附性能及吸附机制

谢水波; 罗景阳; 刘清; 凌辉; 段毅; 王劲松

doi:10.13801/j.cnki.fhclxb.20140519.002

羟乙基纤维素/海藻酸钠复合膜对六价铀的吸附性能及吸附机制

谢水波^1,2,,
罗景阳¹,
刘清^1,2,
凌辉¹,
段毅³,
王劲松^1,2

1.
南华大学城市建设学院, 衡阳 421001;
2.
南华大学污染控制与资源化技术湖南省重点实验室, 衡阳 421001;
3.
中钢集团武汉安全环保研究院有限公司, 武汉 430081

基金项目: 国家自然科学基金(11175081, 21177053); 高等学校博士学科点专项科研基金(20134324110003); 湖南省科技计划重点项目(2011sk2015); 湖南省高校创新平台开放基金(13K085, 13K086)

详细信息

通讯作者:
谢水波,博士,教授,博士生导师,研究方向为环境生物技术、水处理理论与技术。E-mail:xiesbmr@263.net

中图分类号: TB332
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出版历程
- 收稿日期: 2014-01-01
- 修回日期: 2014-04-10
- 刊出日期: 2015-02-14

Adsorption characteristics and mechanism of hydroxyethyl cellulose/sodium alginate blend films for uranium(Ⅵ)

1.
Institute of Urban Construction, University of South China, Hengyang 421001, China;
2.
Hunan Province Key Laboratory of Pollution Control and Resources Reuse Technology, University of South China, Hengyang 421001, China;
3.
Sinosteel Corporation Wuhan Safety and Environmental Protection Research Institute, Wuhan 430081, China

摘要

摘要: 将羟乙基纤维素(HEC)与海藻酸钠(SA)进行混合,利用戊二醛交联处理后制备了HEC/SA高分子复合多孔薄膜,并探讨了其对模拟含铀废水中的六价铀(U(Ⅵ))的吸附特性。通过静态实验,探讨了初始pH值、U(Ⅵ)初始浓度、温度和吸附时间等对HEC/SA复合膜吸附U(Ⅵ)效果的影响;对吸附过程进行了热力学与动力学分析,利用FTIR、SEM和X射线能谱等手段分析了其吸附机制。实验结果表明,U(Ⅵ)的吸附量与温度正相关,吸附平衡时间约为90 min,最佳吸附效果的初始pH值为5.0;吸附过程符合准二级动力学模型,主要表现为颗粒内部扩散;等温吸附过程符合Langmuir等温吸附线模型,在45 ℃时,HEC/SA复合膜对U(Ⅵ)的最大吸附容量达357.1 mg·g^-1,HEC/SA复合膜对U(Ⅵ)的吸附存在离子交换作用,与U(Ⅵ)的相互作用基团为羧基。
- 海藻酸钠 /
- 羟乙基纤维素 /
- 多孔复合膜 /
- 六价铀 /
- 吸附性能 /
- 吸附机制
Abstract: Hydroxyethyl cellulose/sodium alginate (HEC/SA) polymer composite porous films were made by blending HEC and SA together and crosslinked by glutaraldehyde, and its adsorption properties for uranium(Ⅵ) (U(Ⅵ)) in simulated wastewater containing uranium were studied. The effects of initial pH value, initial U(Ⅵ) ions concentration, temperature and adsorption time et al on the adsorption of HEC/SA blend films for U(Ⅵ) were investigated by static experiment. The process of adsorption was investigated by thermodynamic and kinetic analysis. The adsorption mechanism was investigated by FTIR, SEM, energy dispersive X-ray spectrum and so on. The experimental results show that there is a positive correlation between temperature and the U(Ⅵ) adsorption quantity, adsorption equilibrium time is about 90 min, and the optimal initial pH value is 5.0. The adsorption process conforms to the pseudo-second-order kinetics model, and mainly preforms particle internal diffusion. The isothermal adsorption process conforms to the Langmuir isothermal adsorption model, when the temperature is 45 ℃, the maximum adsorption capacity of HEC/SA blend films for U(Ⅵ) ions reaches 357.1 mg·g^-1. The adsorption of HEC/SA blend films for U(Ⅵ) presents ion-exchange process, and the interaction groups with U(Ⅵ) is carboxyl.
- sodium alginate /
- hydroxyethyl cellulose /
- porous composite films /
- uranium(Ⅵ) /
- adsorption characteristic /
- adsorption mechanism

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