Selective adsorption of U(Ⅵ) and Cu(Ⅱ) ions by sunflower straw

AI Lian; LUO Xuegang; WANG Yuhao; MEI Qiang

doi:10.3969/j.issn.0438-1157.2014.04.041

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Selective adsorption of U(Ⅵ) and Cu(Ⅱ) ions by sunflower straw

更新时间：2025-12-10

- Selective adsorption of U(Ⅵ) and Cu(Ⅱ) ions by sunflower straw
- CIESC Journal Issue 4, Pages: 1450-1461(2014)
- 作者机构：
  
  1. 西南科技大学材料科学与工程学院,四川,绵阳,621010
  2. 西南科技大学生物质材料教育部工程研究中心,四川,绵阳,621010
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.04.041
  CLC： Q35X591
- Online First：10 October 2013，
  
  Published：10 October 2013
- 稿件说明：
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AI Lian, LUO Xuegang, WANG Yuhao, et al. Selective adsorption of U(Ⅵ) and Cu(Ⅱ) ions by sunflower straw[J]. CIESC Journal, 2014, (4): 1450-1461.
DOI：

AI Lian, LUO Xuegang, WANG Yuhao, et al. Selective adsorption of U(Ⅵ) and Cu(Ⅱ) ions by sunflower straw[J]. CIESC Journal, 2014, (4): 1450-1461. DOI： 10.3969/j.issn.0438-1157.2014.04.041.

摘要

以分别含有单一的U（Ⅵ）、Cu（Ⅱ）溶液以及U（Ⅵ）、Cu（Ⅱ）混合溶液为吸附质，系统探讨了pH值、吸附剂量、温度、时间和初始离子浓度对向日葵秸秆吸附效果的影响。采用准二级动力学模型、Langmuir、Freundlich和Langmuir-Freundlich等温吸附模型对实验数据进行拟合，从分配系数和分离因子角度对吸附选择性进行分析，并对吸附机理进行探讨。结果表明：向日葵秸秆对U（Ⅵ）和Cu（Ⅱ）的吸附分别是自发的吸热和放热反应；吸附动力学均符合准二级动力学模型，即化学吸附为控速步骤；单离子体系下U（Ⅵ）和Cu（Ⅱ）的吸附等温线分别符合Langmuir-Freundlich和Langmuir等温吸附模型；复配体系下，当干扰Cu（Ⅱ）浓度≥60 mg·L-1时，U（Ⅵ）的吸附等温线可用Langmuir-Freundlich模型描述；而当干扰U（Ⅵ）浓度≥200 mg·L-1时，Cu（Ⅱ）的吸附等温线可用Langmuir模型描述。当溶液中同时存在U（Ⅵ）和Cu（Ⅱ）两种离子时，离子间存在竞争吸附，且向日葵秸秆对U（Ⅵ）具有更高的选择性，这与金属本身的特性有关。向日葵秸秆吸附前后的SEM、EDX和FT-IR图谱表明，吸附U（Ⅵ）和Cu（Ⅱ）的主要方式为络合和离子交换。

Abstract

The sorption properties for U(Ⅵ) and Cu(Ⅱ) ions

alone or mixed

onto raw sunflower straw were systematically evaluated in a series of batch experiments by varying solution pH

adsorbent dosage

temperature

contact time and initial ion concentration. The kinetic data were examined with pseudo-second-order kinetic model

and the equilibrium data obtained were analyzed with Langmuir

Freundlich and Langmuir-Freundlich isotherm equations. It was shown that the positive and negative enthalpy change suggested the endothermic and exothermic nature of U(Ⅵ) and Cu(Ⅱ) ions sorption

respectively. The kinetic data followed pseudo-second-order equation

indicating that the chemical process (adsorption) was rate-limiting step. The equilibrium adsorption data of alone U(Ⅵ) and Cu(Ⅱ) ions could be well described with Langmuir-Freundlich and Langmuir isotherm model

respectively. While for mixed U(Ⅵ) and Cu(Ⅱ) ions Langmuir-Freundlich equation was better for U(Ⅵ) ion at Cu(Ⅱ) concentration more than 60 mg·L-1

but Langmuir model was best for Cu(Ⅱ) ion at U(Ⅵ) concentration more than 200 mg·L-1. Obviously

sunflower straw is of an excellent adsorption selectivity toward U(Ⅵ) over Cu(Ⅱ) in terms of distribution coefficient and separation factor

which was likely related to itself properties of metal ion. Furthermore

these results obtained by FT-IR

SEM and EDX revealed that the adsorption mechanism of U(Ⅵ) and Cu(Ⅱ) ions onto sunflower straw is likely to ion exchange and complexation.

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