Facile fabrication of dolomite-doped biochar/bentonite for effective removal of phosphate from complex wastewaters

Huan Xi, Fanlu Min, Zhanhu Yao, Jianfeng Zhang

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Front. Environ. Sci. Eng. ›› 2023, Vol. 17 ›› Issue (6) : 71. DOI: 10.1007/s11783-023-1671-7
RESEARCH ARTICLE

Facile fabrication of dolomite-doped biochar/bentonite for effective removal of phosphate from complex wastewaters

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Highlights

● Dolomite-doped biochar/bentonite was synthesized for phosphate removal.

● DO/BB exhibited a high phosphate adsorption capacity in complex water environments.

● PVC membrane incorporated with DO/BB can capture low concentration phosphate.

● Electrostatic interaction, complexation and precipitation are main mechanisms.

Abstract

The removal of phosphate from wastewater using traditional biological or precipitation methods is a huge challenge. The use of high-performance adsorbents has been shown to address this problem. In this study, a novel composite adsorbent, composed of dolomite-doped biochar and bentonite (DO/BB), was first synthesized via co-pyrolysis. The combination of initial phosphate concentration of 100 mg/L and 1.6 g/L of DO/BB exhibited a high phosphate-adsorption capacity of 62 mg/g with a removal efficiency of 99.8%. It was also stable in complex water environments with various levels of solution pH, coexisting anions, high salinity, and humic acid. With this new composite, the phosphate concentration of the actual domestic sewage decreased from 9 mg/L to less than 1 mg/L, and the total nitrogen and chemical oxygen demand also decreased effectively. Further, the cross-flow treatment using a PVC membrane loaded with DO/BB (PVC-DO/BB), decreased the phosphate concentration from 1 to 0.08 mg/L, suggesting outstanding separation of phosphate pollutants via a combination of adsorption and separation. In addition, the removal of phosphate by the PVC-DO/BB membrane using NaOH solution as an eluent was almost 90% after 5 cycles. The kinetic, isotherm and XPS analysis before and after adsorption suggested that adsorption via a combination of electrostatic interaction, complexation and precipitation contributed to the excellent separation by the as-obtained membranes.

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Keywords

Biochar-bentonite composite / Dolomite doping / Phosphate adsorption / Polymeric matrix membrane / Adsorption-filtration dual functions / Low-concentration phosphate

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Huan Xi, Fanlu Min, Zhanhu Yao, Jianfeng Zhang. Facile fabrication of dolomite-doped biochar/bentonite for effective removal of phosphate from complex wastewaters. Front. Environ. Sci. Eng., 2023, 17(6): 71 https://doi.org/10.1007/s11783-023-1671-7

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Acknowledgements

The authors would like to acknowledge the National Natural Science Foundation of China (No. 52078189) and the Key R&D Program of Jiangsu Province (China) (No. BE2020024) for supporting this research.

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11783-023-1671-7 and is accessible for authorized users.

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