Defects-rich MgFe LDH: A high-capacity adsorbent for methyl orange wastewater

doi:10.1016/j.cjche.2024.06.006

Chinese Journal of Chemical Engineering ›› 2024, Vol. 74 ›› Issue (10): 63-73.DOI: 10.1016/j.cjche.2024.06.006

Defects-rich MgFe LDH: A high-capacity adsorbent for methyl orange wastewater

Chunmei Zhu¹, Liting Zhang¹, Chenyuan Cui¹, Xin Lian¹, Long Qu¹, Bai He¹, Guoyuan Yuan¹, Jian Feng¹, Siwei Xiang², Bo Yu¹

1 School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;
2 Research Center of Smart Environmental Analysis, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China

Received:2024-03-17 Revised:2024-05-16 Accepted:2024-06-12 Online:2024-07-06 Published:2024-10-28
Contact: Siwei Xiang,E-mail:xiangsiwei@cigit.ac.cn;Bo Yu,E-mail:yubo@cqust.edu.cn
Supported by:
The authors thank the National Natural Science Foundation of China (21908012), the Natural Science Foundation of Chongqing, China (cstc2020jcyj-msxmX0875 and CSTB2022BSXM-JSX0021), Chongqing Postdoctoral Research Project Special Funding (2023CQBSHTB3110), Postgraduate Research and Innovation Project of Chongqing University of Science and Technology (YKJCX2220541) and Major Enterprise Demand Projects with Open Bidding for Selecting the Best Candidates in Yichun City, China (2023JBGSXM05) for the financial support to this work.

Defects-rich MgFe LDH: A high-capacity adsorbent for methyl orange wastewater

Chunmei Zhu¹, Liting Zhang¹, Chenyuan Cui¹, Xin Lian¹, Long Qu¹, Bai He¹, Guoyuan Yuan¹, Jian Feng¹, Siwei Xiang², Bo Yu¹

1 School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;
2 Research Center of Smart Environmental Analysis, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China

通讯作者: Siwei Xiang,E-mail:xiangsiwei@cigit.ac.cn;Bo Yu,E-mail:yubo@cqust.edu.cn
基金资助:
The authors thank the National Natural Science Foundation of China (21908012), the Natural Science Foundation of Chongqing, China (cstc2020jcyj-msxmX0875 and CSTB2022BSXM-JSX0021), Chongqing Postdoctoral Research Project Special Funding (2023CQBSHTB3110), Postgraduate Research and Innovation Project of Chongqing University of Science and Technology (YKJCX2220541) and Major Enterprise Demand Projects with Open Bidding for Selecting the Best Candidates in Yichun City, China (2023JBGSXM05) for the financial support to this work.

Abstract

Abstract: Dye pollution is a common pollutant in wastewater that poses a serious threat to human health. Layered double hydroxide (LDH) is a commonly used adsorbent for dye removal. However, its adsorption efficiency is significantly limited by the limited adsorption active sites of the adsorbent. In this paper, a defects-rich MgFe LDH adsorbent for anionic dye wastewater was synthesized by a simple hydrothermal method and alkaline etching. Different analytical techniques, such as XRD, FT-IR, SEM, TEM, XPS, and N₂ adsorption-desorption isotherm, were used to verify the chemical composition and surface characteristics of the materials, and the effects of pH, temperature, and contact time on the adsorption effect of methyl orange and the adsorption mechanism were analyzed. Alkaline etching of Al and Zn in the laminate generated defects that expose unsaturated coordination centers and create abundant adsorption sites, which can electrostatically attract and coordinate with dye ions. At 25 °C, the adsorption capacity of MgFe LDH with Al etched and MgFe LDH with Zn etched for methyl orange dye reached 1722 mg·g^-1 and 1685 mg·g^-1, respectively, much higher than that of MgFe LDH (544 mg·g^-1). This work provides a promising method for the removal of dye wastewater by adsorption and a new idea for the design and development of high-performance dye wastewater adsorbents.

Key words: MgFe LDH, Methyl orange, Alkaline etching, Defects, Adsorption

摘要： Dye pollution is a common pollutant in wastewater that poses a serious threat to human health. Layered double hydroxide (LDH) is a commonly used adsorbent for dye removal. However, its adsorption efficiency is significantly limited by the limited adsorption active sites of the adsorbent. In this paper, a defects-rich MgFe LDH adsorbent for anionic dye wastewater was synthesized by a simple hydrothermal method and alkaline etching. Different analytical techniques, such as XRD, FT-IR, SEM, TEM, XPS, and N₂ adsorption-desorption isotherm, were used to verify the chemical composition and surface characteristics of the materials, and the effects of pH, temperature, and contact time on the adsorption effect of methyl orange and the adsorption mechanism were analyzed. Alkaline etching of Al and Zn in the laminate generated defects that expose unsaturated coordination centers and create abundant adsorption sites, which can electrostatically attract and coordinate with dye ions. At 25 °C, the adsorption capacity of MgFe LDH with Al etched and MgFe LDH with Zn etched for methyl orange dye reached 1722 mg·g^-1 and 1685 mg·g^-1, respectively, much higher than that of MgFe LDH (544 mg·g^-1). This work provides a promising method for the removal of dye wastewater by adsorption and a new idea for the design and development of high-performance dye wastewater adsorbents.

关键词: MgFe LDH, Methyl orange, Alkaline etching, Defects, Adsorption

Chunmei Zhu, Liting Zhang, Chenyuan Cui, Xin Lian, Long Qu, Bai He, Guoyuan Yuan, Jian Feng, Siwei Xiang, Bo Yu. Defects-rich MgFe LDH: A high-capacity adsorbent for methyl orange wastewater[J]. Chinese Journal of Chemical Engineering, 2024, 74(10): 63-73.

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Defects-rich MgFe LDH: A high-capacity adsorbent for methyl orange wastewater

Defects-rich MgFe LDH: A high-capacity adsorbent for methyl orange wastewater

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