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ORIGINAL RESEARCH
Cr (VI) Removal by Polyethyleneimine and
Magnetically Modified Garden Waste Biochar
1
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power,
Zhengzhou, 450045, PR China
2
Henan Vocational College of Water Conservancy and Environment, Zhengzhou 450008, PR China
Submission date: 2024-06-16
Final revision date: 2024-08-10
Acceptance date: 2024-09-09
Online publication date: 2025-01-29
Publication date: 2025-11-04
Corresponding author
Xiaohan Duan
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450045, PR China
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450045, PR China
Pol. J. Environ. Stud. 2025;34(6):7423-7436
KEYWORDS
TOPICS
ABSTRACT
In this study, garden waste, polyethyleneimine, and Fe2+/Fe3+ were used as starting materials to create
polyethyleneimine and magnetically modified biochar derived from garden waste (P/Fe3O4@GWBC).
The best condition for the preparation of the composite was explored in order to produce P/Fe3O4@
GWBC for batch testing on Cr (VI) removal. P/Fe3O4@GWBC had a rough surface with numerous fine
particles, which was a typical composite with both micropore and mesopore. The experiment’s findings
indicated that the acid environment was favorable for Cr (Ⅵ) adsorption. The adsorption process
could be properly described by the pseudo-second-order kinetics model. The isotherm investigation
demonstrated the monolayer adsorption of Cr (VI) by the appropriate fitting utilizing the Langmuir
equation. The highest Cr (VI) uptake computed using the Langmuir equation was 52.6 mg/g, ranking
fourth among 11 composites. The investigation of thermodynamics revealed that the adsorption process
was spontaneous and endothermic. The main mechanisms for Cr (VI) removal include electrostatic
adsorption, ion exchange, chelation, and Cr (VI) reduction.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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