Efficiency Recycling and Utilization of Phosphate from Wastewater Using LDHs-Modified Biochar

Chunxia Ding, Xiuyu Long, Guangyong Zeng, Yu Ouyang, Bowen Lei, Rongying Zeng, Jing Wang and Zhi Zhou ()
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Chunxia Ding: School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
Xiuyu Long: School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
Guangyong Zeng: School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
Yu Ouyang: School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
Bowen Lei: School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
Rongying Zeng: College of Chemistry and Material Science, Hengyang Normal University, Hengyang 421001, China
Jing Wang: School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China
Zhi Zhou: School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China

IJERPH, 2023, vol. 20, issue 4, 1-16

Abstract: The excessive application of phosphate fertilizers easily causes water eutrophication. Phosphorus recovery by adsorption is regarded as an effective and simple intervention to control water bodies’ eutrophication. In this work, a series of new adsorbents, layered double hydroxides (LDHs)-modified biochar (BC) with different molar ratios of Mg 2+ and Fe 3+ , were synthesized based on waste jute stalk and used for recycling phosphate from wastewater. The prepared LDHs-BC4 (the molar ratio of Mg/Fe is 4:1) has significantly high adsorption performance, and the recovery rate of phosphate is about 10 times higher than that of the pristine jute stalk BC. The maximum adsorption capacity of LDHs-BC4 for phosphate was 10.64 mg-P/g. The main mechanism of phosphate adsorption mainly includes electrostatic attraction, ion exchange, ligand exchange, and intragranular diffusion. Moreover, the phosphate-adsorbed LDHs-BC4 could promote mung bean growth, which indicated the recovery phosphate from wastewater could be used as a fertilizer.

Keywords: phosphate; LDHs; biochar; recycling; fertilizer (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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