Phosphogypsum-Based Composite Cementitious Porous Filter Media: Performance Regulation and Phosphate Adsorption Mechanism
- 1College of Urban Construction, Nanjing Tech University, Puzhu Road 30, Nanjing 211816, China
- 2College of Engineering, Carnegie Mellon University, Forbes Ave, 119 Porter Hall, 5000, Pittsburgh, PA 15213, USA
Abstract
In this work, a high-dosage phosphogypsum (PG) composite cementitious system was fabricated via alkali activation, using 50 wt.% PG, 15 wt.% fly ash and 35 wt.% ordinary Portland cement. Redispersible polymer powder (RPP) was incorporated to improve matrix toughness, and animal protein foaming was employed to construct continuous mesoporous structures for water treatment. Key preparation parameters were optimized through single-factor experiments. The optimized porous filter media present a bulk density of 0.809 g/cm3, a 1 h water absorption rate of 39%, and a breakage and wear rate of 4.89%. In static adsorption tests with 40 mg/L simulated phosphate wastewater, the filter media achieve a phosphate-removal rate of 71.81% within 6 h, which is significantly superior to that of commercial sintered ceramsite (50.28%). Combined characterization using BET, SEM, XRD, XRF and FT-IR demonstrates that phosphate removal mainly relies on calcium-induced chemical precipitation, with mesoporous physical adsorption playing an auxiliary role. Leaching tests verify that all heavy metal leaching concentrations of the prepared filter media satisfy the GB 5085.3-2007 standard, while fluoride release can be detected under strong acid conditions. This polymer modification strategy facilitates large-scale PG solid waste disposal and eutrophic water remediation, providing a practical route for preparing low-cost polymer-inorganic porous filter media for water purification.
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BibTeX
@article{xia2026phosphogypsumbased,
title = {{Phosphogypsum-Based Composite Cementitious Porous Filter Media: Performance Regulation and Phosphate Adsorption Mechanism}},
author = {Yu Xia and Jianjun Xia and Xishu Xu and Dianxi Yu and Zhiheng Zhang and Ting Xia},
journal = {Polymers},
year = {2026},
month = oct,
doi = {10.3390/polym18202487},
url = {https://www.mdpi.com/2073-4360/18/20/2487},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Phosphogypsum-Based Composite Cementitious Porous Filter Media: Performance Regulation and Phosphate Adsorption Mechanism
AU - Yu Xia
AU - Jianjun Xia
AU - Xishu Xu
AU - Dianxi Yu
AU - Zhiheng Zhang
AU - Ting Xia
PY - 2026
DA - 2026/10/12
JO - Polymers
DO - 10.3390/polym18202487
UR - https://www.mdpi.com/2073-4360/18/20/2487
AB - In this work, a high-dosage phosphogypsum (PG) composite cementitious system was fabricated via alkali activation, using 50 wt.% PG, 15 wt.% fly ash and 35 wt.% ordinary Portland cement. Redispersible polymer powder (RPP) was incorporated to improve matrix toughness, and animal protein foaming was employed to construct continuous mesoporous structures for water treatment. Key preparation parameters were optimized through single-factor experiments. The optimized porous filter media present a bulk density of 0.809 g/cm3, a 1 h water absorption rate of 39%, and a breakage and wear rate of 4.89%. In static adsorption tests with 40 mg/L simulated phosphate wastewater, the filter media achieve a phosphate-removal rate of 71.81% within 6 h, which is significantly superior to that of commercial sintered ceramsite (50.28%). Combined characterization using BET, SEM, XRD, XRF and FT-IR demonstrates that phosphate removal mainly relies on calcium-induced chemical precipitation, with mesoporous physical adsorption playing an auxiliary role. Leaching tests verify that all heavy metal leaching concentrations of the prepared filter media satisfy the GB 5085.3-2007 standard, while fluoride release can be detected under strong acid conditions. This polymer modification strategy facilitates large-scale PG solid waste disposal and eutrophic water remediation, providing a practical route for preparing low-cost polymer-inorganic porous filter media for water purification.
SN - 2073-4360
ER -