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

Jiahong Wang; Tongtong Sun; Atif Saleem; Yao Chen

doi:10.1016/j.cjche.2020.03.019

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

Energy, Resources and Environmental Technology | Updated：2026-01-06

- 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
- 中国化学工程学报（英文版） 2020年28卷第10期页码：2650-2657
- Affiliations：
  
  1. School of Environmental Science and Engineering, Shaanxi University of Science and Technology,Xi'an,China,710021
  2. Shaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials,Xi'an,China,710021
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2020.03.019
  中图分类号：
- 纸质出版：2020
- Accepted：
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Jiahong Wang, Tongtong Sun, Atif Saleem, 等. Enhanced adsorptive removal of Cr(VI) in aqueous solution by polyethyleneimine modified palygorskite[J]. 中国化学工程学报（英文版）, 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.
Jiahong Wang, Tongtong Sun, Atif Saleem, 等. Enhanced adsorptive removal of Cr(VI) in aqueous solution by polyethyleneimine modified palygorskite[J]. 中国化学工程学报（英文版）, 2020,28(10):2650-2657. DOI： 10.1016/j.cjche.2020.03.019.

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. DOI： 10.1016/j.cjche.2020.03.019.

摘要

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

and PO

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.

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