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eISSN: 2083-5906
ISSN: 1230-1485
ISSN: 1230-1485
ORIGINAL RESEARCH
Preparation of Magnesium-Modified Dual-Sludge
Biochar and Its Aqueous Phosphorus
Adsorption Characteristics
1
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power,
Zhengzhou, 450046, PR China
2
Henan Vocational College of Water Conservancy and Environment, Zhengzhou, 450008, PR China
3
Zhongzhou Water Holdings Co., Ltd, Zhengzhou, 450000, PR China
Submission date: 2025-05-08
Final revision date: 2025-09-22
Acceptance date: 2025-11-05
Online publication date: 2026-07-02
Corresponding author
Shuli Liu
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450046, PR China
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450046, PR China
KEYWORDS
TOPICS
ABSTRACT
In this study, magnesium-modified dual-sludge biochar (Mg@DSB) was synthesized using
paper mill sludge, iron-based waterworks sludge, and magnesium ions as raw materials for
the removal of phosphorus from the water. After characterizing the material, static adsorption
experiments were conducted to evaluate its performance in phosphorus removal. The results demonstrate
that within the pH range of 3 to 9, the adsorption capacity of Mg@DSB for phosphorus increases with
rising pH levels. The adsorption process is well described by the pseudo-second-order kinetic model
and the Langmuir isotherm. Thermodynamic analysis reveals that the adsorption of phosphorus by
Mg@DSB is a spontaneous and endothermic process. The coexistence of Cl−, NO3−, SO4
2−, and sodium
humate all significantly impaired the material’s phosphorus uptake (p<0.05), with the three inorganic
anions exerting a stronger suppressive effect than sodium humate (p<0.05). Nevertheless, increasing
the concentration of any interferent did not lead to a further reduction (p>0.05). Mg@DSB enables
highly efficient phosphorus removal from both the influent and effluent of a wastewater treatment plant.
Mechanistic analysis further elucidates that the removal of phosphorus by Mg@DSB is driven by
electrostatic adsorption and chemical precipitation.
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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| eISSN: | 2083-5906 |
| ISSN: | 1230-1485 |
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