Competitive adsorption characteristics of water-quenched blast furnace slag(WBFS) towards Cu2+、Cd2+ and Zn2+

doi:10.16085/j.issn.1000-6613.2015.11.040

Chemical Industry and Engineering Progree ›› 2015, Vol. 34 ›› Issue (11): 4071-4078.DOI: 10.16085/j.issn.1000-6613.2015.11.040

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Competitive adsorption characteristics of water-quenched blast furnace slag(WBFS) towards Cu²⁺、Cd²⁺ and Zn²⁺

WANG Zhe^1,3, HUANG Guohe¹, AN Chunjiang², CHEN Lirong³, LIU Jinliang³

1 MOE Key Laboratory of Regional Energy and Environmental Systems Optimization, Resources and Environmental Research Academy, North China Electric Power University, Beijing 102206, China;
2 Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina S4S0A2, Saskatchewan, Canada;
3 School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China

Received:2015-04-21 Revised:2015-06-11 Online:2015-11-05 Published:2015-11-05

Cu²⁺、Cd²⁺、Zn²⁺在高炉水淬渣上的竞争吸附特性

王哲^1,3, 黄国和¹, 安春江², 陈莉荣³, 刘金亮³

1 华北电力大学能源与环境研究院, 区域能源系统优化教育部重点实验室, 北京 102206;
2 里贾纳大学能源、环境和可持续发展研究所, 加拿大萨斯喀彻温省里贾纳 S4S0A2;
3 内蒙古科技大学能源与环境学院, 内蒙古包头 014010

通讯作者: 黄国和,教授,博士生导师,研究方向为环境污染治理新技术研究。E-mailhuangg@uregina.ca。
作者简介:王哲(1979—),女,副教授,博士研究生,研究方向为固体废物资源化。E-mailwz0478@163.com。
基金资助:
教育部重点项目(311013)。

Abstract

Abstract: The single-component and competitive adsorption properties of Cu²⁺、Cd²⁺、Zn²⁺ ions on water-quenched blast furnace slag (WBFS) were investigated by isothermal adsorption experiment. The results showed the adsorption process and isotherm curves of the metal ions followed Langmuir isotherm model and “H” type in single-component adsorption, respectively. The order of the adsorption capacities was Cu²⁺> Cd²⁺> Zn²⁺, which determined mainly by the electro negativity, hydrated ionic radius and charge to radius ratio. The adsorption isotherms of Cu²⁺ maintained the original shape and still fitted to Langmuir adsorption model in competitive condition, while the other adsorption model could not well represent the competitive adsorption of Cd²⁺ and Zn²⁺. The mutual competition and antagonism effect of heavy metals in competitive system resulted in the irregularity of sorption isotherm curves of Cd²⁺ and Zn²⁺. The adsorption capacities of the competitive ions on WBFS decreased to some extent compared with those of single ion adsorption. The sorption kinetic processes were rapid first and followed slow in accordance with pseudo-second-order kinetic model, which suggested that the process controlling the rate may be a chemical sorption between WBFS and Cu²⁺、Cd²⁺、Zn²⁺.

Key words: water-quenched blast furnace slag, heavy metal, waste water, single adsorption, competitive adsorption, kinetic modeling

摘要： 利用等温吸附法考察了高炉水淬渣对Cu²⁺、Cd²⁺、Zn²⁺的单组分吸附和竞争吸附性能。结果表明,单一组分吸附时,金属离子吸附等温线属于“H”形等温线,吸附平衡符合Langmuir吸附等温模型,高炉水淬渣吸附的顺序为Cu²⁺ >Cd²⁺ >Zn²⁺,这与重金属离子电负性、水合离子半径及荷径比等有关。当加入竞争离子后,Cu²⁺的吸附等温线基本维持原来形状,且仍旧与Langmuir吸附等温模型比较相符,而Cd²⁺ 和Zn²⁺的吸附无法与现有等温吸附模型很好地拟合,等温线的形状由于竞争作用也与传统的等温线均不相同,同时各金属离子的吸附量都比单组分的吸附量降低了。吸附动力学过程先是一个快速阶段,然后进入慢速阶段。无论是单组分还是竞争条件下,伪二级动力学方程拟合结果较好,说明高炉水淬渣与Cu²⁺、Cd²⁺、Zn²⁺之间的吸附过程主要是以化学吸附为主。

关键词: 高炉水淬渣, 重金属, 废水, 单一吸附, 竞争吸附, 动力学模型

CLC Number:

X753

WANG Zhe, HUANG Guohe, AN Chunjiang, CHEN Lirong, LIU Jinliang. Competitive adsorption characteristics of water-quenched blast furnace slag(WBFS) towards Cu²⁺、Cd²⁺ and Zn²⁺[J]. Chemical Industry and Engineering Progree, 2015, 34(11): 4071-4078.

王哲, 黄国和, 安春江, 陈莉荣, 刘金亮. Cu²⁺、Cd²⁺、Zn²⁺在高炉水淬渣上的竞争吸附特性[J]. 化工进展, 2015, 34(11): 4071-4078.

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Competitive adsorption characteristics of water-quenched blast furnace slag(WBFS) towards Cu²⁺、Cd²⁺ and Zn²⁺

Cu²⁺、Cd²⁺、Zn²⁺在高炉水淬渣上的竞争吸附特性

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