ORIGINAL RESEARCH
Polyethyleneimine-Modified Garden Waste
Biochar: Preparation and Its Application
for Aqueous Cr(Ⅵ) Adsorption
1
School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, PR China
2
Henan Key Laboratory of Water Resources Conservation and Intensive Utilization in the Yellow River Basin,
Zhengzhou, 450046, PR China
3
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power,
Zhengzhou, 450046, PR China
4
Henan Vocational College of Water Conservancy and Environment, Zhengzhou 450008, PR China
Submission date: 2023-09-25
Final revision date: 2023-12-08
Acceptance date: 2024-05-12
Online publication date: 2025-05-05
Publication date: 2025-06-06
Corresponding author
Jingxi Tie
North China University of Water Resources and Electric Power, No.36 North ring road, 450011, zhengzhou, China
North China University of Water Resources and Electric Power, No.36 North ring road, 450011, zhengzhou, China
Pol. J. Environ. Stud. 2025;34(4):4833-4842
KEYWORDS
TOPICS
ABSTRACT
Garden Waste (GW) and Polyethyleneimine were used as source materials to create
polyethyleneimine-modified garden waste biochar (PGWBC). The composite was employed as an
adsorbent in both static and dynamic Cr(VI) adsorption experiments after being evaluated using N2
adsorption-desorption and Fourier transform infrared spectroscopy. The material characterization
results indicated that PGWBC was a mesoporous material that contained mainly narrow slit mesopores.
The static adsorption data indicated that Cr(VI) adsorption by PGWBC was a pH-dependent process,
a rise in pH from 2 to 9 resulting in a decrease in Cr(VI) adsorption from 44.6 mg/g to 3.8 mg/g.
The adsorption process was endothermic and spontaneous, as characterized by the pseudo-second-order
model and the Langmuir equation, the maximum Cr(Ⅵ) uptake was 56.1 mg/g in 308 K. The dynamic
adsorption revealed that increasing the flow rate impaired Cr(VI) adsorption, and the Thomas model
was more suited to represent Cr(VI) adsorption by PGWBC than the Yoon-Nelson model.
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| eISSN: | 2083-5906 |
| ISSN: | 1230-1485 |
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