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Volume 12
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10.3390/app12115334
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Article

Removal of Phosphate from Aqueous Solution by Zeolite-Biochar Composite: Adsorption Performance and Regulation Mechanism

by
Zhaoxia Deng
1,2,
Shangyi Gu
1,
Hongguang Cheng
2,*,
Dan Xing
3,
Gratien Twagirayezu
4,
Xi Wang
2,5,
Wenjing Ning
2,6 and
Mingming Mao
1,3
1
College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
2
State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
3
Guizhou Academy of Agricultural Science, Institute of Pepper Guiyang, Guiyang 550000, China
4
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
5
Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of the Yangtze River), Ministry of Agriculture, College of Resource and Environment, Huazhong Agricultural University, Wuhan 430070, China
6
College of Resources and Environment, Yangtze University, Wuhan 430100, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2022, 12(11), 5334; https://doi.org/10.3390/app12115334
Submission received: 20 April 2022 / Revised: 9 May 2022 / Accepted: 17 May 2022 / Published: 25 May 2022
(This article belongs to the Special Issue Biochar: Preparation, Modification and Environmental Application)
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Abstract

Recently, rampant eutrophication induced by phosphorus enrichment in water has been attracting attention worldwide. However, the mechanisms by which phosphate can be eliminated from the aqueous environment remain unclear. This study was aimed at investigating the adsorption performance and regulation mechanisms of the zeolite-biochar composite for removing phosphate from an aqueous environment. To do this, physicochemical properties of the zeolite-biochar composite were assessed by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) specific surface area (SSA) analyzer, and transmission electron microscopy (TEM). Adsorption tests were performed to evaluate the adsorption ability of the composite material for mitigating excess phosphorus in the aqueous environment. The findings evinced that the phosphorus removed by PZC 7:3 (pyrolyzed zeolite and corn straw at a mass ratio of 7:3) can reach 90% of that removed by biochar. The maximum adsorption capacities of zeolite, biochar, and PZC 7:3 were 0.69, 3.60, and 2.41 mg/g, respectively. The main mechanism of phosphate removal by PZC 7:3 was the formation of thin-film amorphous calcium-magnesium phosphate compounds through ligand exchange. This study suggests that PZC 7:3 is a viable adsorbent for the removal of phosphate from aquatic systems.
Keywords: phosphate; natural zeolite; biochar; composite; co-pyrolysis phosphate; natural zeolite; biochar; composite; co-pyrolysis

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MDPI and ACS Style

Deng, Z.; Gu, S.; Cheng, H.; Xing, D.; Twagirayezu, G.; Wang, X.; Ning, W.; Mao, M. Removal of Phosphate from Aqueous Solution by Zeolite-Biochar Composite: Adsorption Performance and Regulation Mechanism. Appl. Sci. 2022, 12, 5334. https://doi.org/10.3390/app12115334

AMA Style

Deng Z, Gu S, Cheng H, Xing D, Twagirayezu G, Wang X, Ning W, Mao M. Removal of Phosphate from Aqueous Solution by Zeolite-Biochar Composite: Adsorption Performance and Regulation Mechanism. Applied Sciences. 2022; 12(11):5334. https://doi.org/10.3390/app12115334

Chicago/Turabian Style

Deng, Zhaoxia, Shangyi Gu, Hongguang Cheng, Dan Xing, Gratien Twagirayezu, Xi Wang, Wenjing Ning, and Mingming Mao. 2022. "Removal of Phosphate from Aqueous Solution by Zeolite-Biochar Composite: Adsorption Performance and Regulation Mechanism" Applied Sciences 12, no. 11: 5334. https://doi.org/10.3390/app12115334

APA Style

Deng, Z., Gu, S., Cheng, H., Xing, D., Twagirayezu, G., Wang, X., Ning, W., & Mao, M. (2022). Removal of Phosphate from Aqueous Solution by Zeolite-Biochar Composite: Adsorption Performance and Regulation Mechanism. Applied Sciences, 12(11), 5334. https://doi.org/10.3390/app12115334

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