茶渣吸附U(Ⅵ)的特性

doi:10.3969/j.issn.0438-1157.2012.10.040

化工学报 ›› 2012, Vol. 63 ›› Issue (10): 3291-3296.DOI: 10.3969/j.issn.0438-1157.2012.10.040

茶渣吸附U(Ⅵ)的特性

刘希涛^1,2, 李广悦¹, 胡南¹, 王永东¹, 丁德馨¹

1. 南华大学铀矿冶生物技术国防重点学科实验室, 湖南衡阳 421001;
2. 焦家金矿, 山东莱州 264000

收稿日期:2012-01-07 修回日期:2012-05-09 出版日期:2012-10-05 发布日期:2012-10-05
通讯作者: 丁德馨
作者简介:丁德馨,刘希涛(1958- ),男,硕士研究生。
基金资助:
国家自然科学基金项目(50774047);湖南省科技厅重点项目(2010GK2025);湖南省教育厅重点项目(10A103)。

Adsorption characteristics of U(Ⅵ)on tea waste

LIU Xitao^1,2, LI Guangyue¹, HU Nan¹, WANG Yongdong¹, DING Dexin¹

1. Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, Hunan, China;
2. Jiaojia Gold Mine, Laizhou 264000, Shandong, China

Received:2012-01-07 Revised:2012-05-09 Online:2012-10-05 Published:2012-10-05
Supported by:
supported by the National Natural Science Foundation of China(50774047).

摘要/Abstract

摘要： 通过静态吸附实验,考察了铀溶液初始pH、初始浓度以及吸附时间、吸附剂粒度、温度对茶渣吸附U(Ⅵ)的影响,分析了吸附过程的动力学行为及等温吸附特性,并通过红外光谱和扫描电镜探讨了吸附机理。结果表明:pH对茶渣吸附U(Ⅵ)的影响较大,pH为2和6时吸附量分别为13.90、43.19 mg·g^-1。茶渣吸附U(Ⅵ)的过程较慢,吸附过程需要12 h才能达到平衡。吸附过程的准二级动力学方程的拟合效果优于准一级动力学方程。吸附量随铀溶液浓度的增加而增大,而吸附率则相反。铀溶液初始浓度为10~100 mg·L^-1,相应的吸附量为9.40~70.05 mg·g^-1,吸附率为94.04%~70.05%。茶渣吸附U(Ⅵ)的动力学行为更符合准二级动力学方程,等温吸附数据对Freundlich方程的拟合度较高。茶渣粒度及温度对茶渣吸附U(Ⅵ)的影响不大。茶渣吸附U(Ⅵ)的过程中,起主要作用的基团有羟基、羰基、硝基、P—O、Si—O。

关键词: 茶渣, 铀溶液, 吸附动力学, 等温吸附线

Abstract: The effect of pH,uranium concentration,contact time,particle size of tea waste and temperature on U(Ⅵ)adsorption by tea waste from aqueous solutions was studied by static adsorption experiments.The kinetic and thermodynamic characteristics of the adsorption process were analyzed,and the adsorption mechanisms were also discussed using data from SEM and FT-IR measurement.The results show that the pH affects greatly adsorption of U(Ⅵ)on tea waste,and U(Ⅵ)amount of adsorption were 13.90 and 43.19 mg·g^-1 at pH 2 and 6,respectively.This adsorption process is slow,and it takes 12 h for adsorption equilibrium.The adsorption kinetics follows pseudo-second order equations rather than pseudo-first order.The amount of adsorption increases but the uranium recoveries decrease with the increasing initial uranium concentration.For example,uranium concentration increases from 10 to 100 mg·L^-1,the U(Ⅵ)adsorption amount goes up from 9.40 to 70.05 mg·g^-1,but uranium recoveries decrease from 94.04% to 70.05%.The adsorption equilibrium data fitted Freundlich isotherm better.The —OH,CO,—NO₃,P—O,Si—O groups on the surface of tea waste are responsible for adsorption of U(Ⅵ).

Key words: tea waste, aqueous uranium solution, adsorption kinetics, adsorption isotherm

中图分类号:

O647.3

刘希涛, 李广悦, 胡南, 王永东, 丁德馨. 茶渣吸附U(Ⅵ)的特性[J]. 化工学报, 2012, 63(10): 3291-3296.

LIU Xitao, LI Guangyue, HU Nan, WANG Yongdong, DING Dexin. Adsorption characteristics of U(Ⅵ)on tea waste[J]. CIESC Journal, 2012, 63(10): 3291-3296.

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茶渣吸附U(Ⅵ)的特性

Adsorption characteristics of U(Ⅵ)on tea waste

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