Enhanced adsorptive removal of Cr(VI) in aqueous solution by polyethyleneimine modified palygorskite

doi:10.1016/j.cjche.2020.03.019

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (10): 2650-2657.DOI: 10.1016/j.cjche.2020.03.019

• Energy, Resources and Environmental Technology • 上一篇下一篇

Enhanced adsorptive removal of Cr(VI) in aqueous solution by polyethyleneimine modified palygorskite

Jiahong Wang^1,2, Tongtong Sun^1,2, Atif Saleem^1,2, Yao Chen^1,2

1 School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China;
2 Shaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials, Xi'an 710021, China

收稿日期:2019-12-10 修回日期:2020-03-08 出版日期:2020-10-28 发布日期:2020-12-03
通讯作者: Jiahong Wang
基金资助:
This work was funded by the National Natural Science Foundation of China (21677092), and the Scientific Research Program funded by Shaanxi Provincial Education Department (15JK1095), Xi'an, China.

Enhanced adsorptive removal of Cr(VI) in aqueous solution by polyethyleneimine modified palygorskite

Jiahong Wang^1,2, Tongtong Sun^1,2, Atif Saleem^1,2, Yao Chen^1,2

1 School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China;
2 Shaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials, Xi'an 710021, China

Received:2019-12-10 Revised:2020-03-08 Online:2020-10-28 Published:2020-12-03
Contact: Jiahong Wang
Supported by:
This work was funded by the National Natural Science Foundation of China (21677092), and the Scientific Research Program funded by Shaanxi Provincial Education Department (15JK1095), Xi'an, China.

摘要/Abstract

摘要： Polyethyleneimine (PEI) modified palygorskite (Pal) was used for the adsorption of Cr(VI) in aqueous solution. The absorbent was characterized by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). Characterized results confirmed that the Pal has been successfully modified by PEI. The modification of PEI increased the Cr(VI) adsorption performance of the Pal by the adsorption combined reduction mechanism, and amino groups of the adsorbent play the main role in the enhanced Cr(VI) adsorption. The maximum adsorption capacity was 51.10 mg·g^-1 at pH 4.0 and 25 ℃. The adsorption kinetics of Cr(VI) on the adsorbent conforms to the Langmuir isotherm model. The maximum adsorption occurs at pH 3, and then the adsorption capacity of PEI-Pal was decreased with the increase of pH values. The adsorption kinetics of Cr(VI) on PEI-Pal was modeled with pseudo-second-order model. The addition of Cl^-, SO₄^2- and PO₄^3- reduced the Cr(VI) adsorption by competition with Cr(VI) for the active sites of PEI-Pal. The Cr(VI) saturated PEI-Pal can be regenerated in alkaline solution, and the adsorption capacity can still be maintained at 30.44 mg·g^-1 after 4 cycles. The results demonstrate that PEI-Pal can be used as a potential adsorbent of Cr(VI) in aqueous solutions.

关键词: Palygorskite, Polyethyleneimine, Adsorption, Cr(VI)

Abstract: Polyethyleneimine (PEI) modified palygorskite (Pal) was used for the adsorption of Cr(VI) in aqueous solution. The absorbent was characterized by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). Characterized results confirmed that the Pal has been successfully modified by PEI. The modification of PEI increased the Cr(VI) adsorption performance of the Pal by the adsorption combined reduction mechanism, and amino groups of the adsorbent play the main role in the enhanced Cr(VI) adsorption. The maximum adsorption capacity was 51.10 mg·g^-1 at pH 4.0 and 25 ℃. The adsorption kinetics of Cr(VI) on the adsorbent conforms to the Langmuir isotherm model. The maximum adsorption occurs at pH 3, and then the adsorption capacity of PEI-Pal was decreased with the increase of pH values. The adsorption kinetics of Cr(VI) on PEI-Pal was modeled with pseudo-second-order model. The addition of Cl^-, SO₄^2- and PO₄^3- reduced the Cr(VI) adsorption by competition with Cr(VI) for the active sites of PEI-Pal. The Cr(VI) saturated PEI-Pal can be regenerated in alkaline solution, and the adsorption capacity can still be maintained at 30.44 mg·g^-1 after 4 cycles. The results demonstrate that PEI-Pal can be used as a potential adsorbent of Cr(VI) in aqueous solutions.

Key words: Palygorskite, Polyethyleneimine, Adsorption, Cr(VI)

Jiahong Wang, Tongtong Sun, Atif Saleem, Yao Chen. Enhanced adsorptive removal of Cr(VI) in aqueous solution by polyethyleneimine modified palygorskite[J]. 中国化学工程学报, 2020, 28(10): 2650-2657.

Jiahong Wang, Tongtong Sun, Atif Saleem, Yao Chen. Enhanced adsorptive removal of Cr(VI) in aqueous solution by polyethyleneimine modified palygorskite[J]. Chinese Journal of Chemical Engineering, 2020, 28(10): 2650-2657.

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Enhanced adsorptive removal of Cr(VI) in aqueous solution by polyethyleneimine modified palygorskite

Enhanced adsorptive removal of Cr(VI) in aqueous solution by polyethyleneimine modified palygorskite

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