Effect of interlayer anions on chromium removal using Mg-Al layered double hydroxides: Kinetic, equilibrium and thermodynamic studies

doi:10.1016/j.cjche.2015.11.018

Chinese Journal of Chemical Engineering ›› 2016, Vol. 24 ›› Issue (4): 433-445.DOI: 10.1016/j.cjche.2015.11.018

• 第25届中国过程控制会议专栏 • 下一篇

Effect of interlayer anions on chromium removal using Mg-Al layered double hydroxides: Kinetic, equilibrium and thermodynamic studies

Mohamed Khitous^1,2, Zineb Salem¹, Djamila Halliche²

1 Laboratory of Industrial Process and Engineering LSGPI, Faculty of Mechanical and Process Engineering, University of Sciences and Technology, Houari Boumediene, BP 32 El-Allia, Bab Ezzouar, Algiers 16111, Algeria;
2 Laboratory of Natural Gas Chemistry, Institute of Chemistry, University of Sciences and Technology, Houari Boumediene, BP 32 El-Allia, Bab Ezzouar, Algiers 16111, Algeria

收稿日期:2015-02-05 修回日期:2015-09-10 出版日期:2016-04-28 发布日期:2016-05-27
通讯作者: Mohamed Khitous
基金资助:
The work was financially supported by both the department of Process Engineering and Chemistry of USTHB (Algiers).

Effect of interlayer anions on chromium removal using Mg-Al layered double hydroxides: Kinetic, equilibrium and thermodynamic studies

Mohamed Khitous^1,2, Zineb Salem¹, Djamila Halliche²

1 Laboratory of Industrial Process and Engineering LSGPI, Faculty of Mechanical and Process Engineering, University of Sciences and Technology, Houari Boumediene, BP 32 El-Allia, Bab Ezzouar, Algiers 16111, Algeria;
2 Laboratory of Natural Gas Chemistry, Institute of Chemistry, University of Sciences and Technology, Houari Boumediene, BP 32 El-Allia, Bab Ezzouar, Algiers 16111, Algeria

Received:2015-02-05 Revised:2015-09-10 Online:2016-04-28 Published:2016-05-27
Contact: Mohamed Khitous
Supported by:
The work was financially supported by both the department of Process Engineering and Chemistry of USTHB (Algiers).

摘要/Abstract

摘要： The influence of interlayer anions such as NO₃^-, SO₄^2- and Cl^- on Mg-Al hydrotalcites for Cr(VI) removal from aqueous solution was studied. The structure of the prepared LDHswas characterized by XRD, SEM, FTIR, TGA, BET surface area and pHzpc. The sorbent ability and sorption mechanisms were also investigated. The LDHs exhibit high removal for Cr(VI), and the sorbed amount depends on the nature of interlayer anion, which decreased in the following order: NO₃^- > Cl^- > SO₄^2-. Nitrate-containing LDH reached a Cr(VI) sorption equilibrium within only 30 min. The effects of operating conditions, including initial concentration, solution pH, agitation time and sorbent amount have been studied in batch mode. The optimum conditions were observed at an initial concentration of 100 mg·L^-1, pH=6, agitation timeof 60 min and a sorbent dose of 2 g·L^-1. The equilibriumdatawere fitted to the Langmuir, Freundlich and Dubinin-Radushkevich isothermmodels. The Langmuir modelwas found to sufficiently describe the sorption process, offering a maximum sorption capacity of 71.91 mg·g^-1. The sorption kinetic follows pseudo-second-order reaction with high accuracy. Thermodynamic parameters suggested that the sorption process is spontaneous and endothermic in nature.

关键词: Hydrotalcite, Cr(VI), Sorption, Layered double hydroxide, Kinetic

Abstract: The influence of interlayer anions such as NO₃^-, SO₄^2- and Cl^- on Mg-Al hydrotalcites for Cr(VI) removal from aqueous solution was studied. The structure of the prepared LDHswas characterized by XRD, SEM, FTIR, TGA, BET surface area and pHzpc. The sorbent ability and sorption mechanisms were also investigated. The LDHs exhibit high removal for Cr(VI), and the sorbed amount depends on the nature of interlayer anion, which decreased in the following order: NO₃^- > Cl^- > SO₄^2-. Nitrate-containing LDH reached a Cr(VI) sorption equilibrium within only 30 min. The effects of operating conditions, including initial concentration, solution pH, agitation time and sorbent amount have been studied in batch mode. The optimum conditions were observed at an initial concentration of 100 mg·L^-1, pH=6, agitation timeof 60 min and a sorbent dose of 2 g·L^-1. The equilibriumdatawere fitted to the Langmuir, Freundlich and Dubinin-Radushkevich isothermmodels. The Langmuir modelwas found to sufficiently describe the sorption process, offering a maximum sorption capacity of 71.91 mg·g^-1. The sorption kinetic follows pseudo-second-order reaction with high accuracy. Thermodynamic parameters suggested that the sorption process is spontaneous and endothermic in nature.

Key words: Hydrotalcite, Cr(VI), Sorption, Layered double hydroxide, Kinetic

Mohamed Khitous, Zineb Salem, Djamila Halliche. Effect of interlayer anions on chromium removal using Mg-Al layered double hydroxides: Kinetic, equilibrium and thermodynamic studies[J]. Chinese Journal of Chemical Engineering, 2016, 24(4): 433-445.

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Effect of interlayer anions on chromium removal using Mg-Al layered double hydroxides: Kinetic, equilibrium and thermodynamic studies

Effect of interlayer anions on chromium removal using Mg-Al layered double hydroxides: Kinetic, equilibrium and thermodynamic studies

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