Decoration of Mg/Fe layered double hydroxides on coffee waste biochars for enhanced adsorption and selectivity of phosphate ions: Mechanistic studies

Decoration of Mg/Fe layered double hydroxides on coffee waste biochars for enhanced adsorption and selectivity of phosphate ions: Mechanistic studies

This study rigorously evaluated the viability of Mg/Fe layered double hydroxides (LDH) decorated biochars produced from coffee wastes (MF-L@CB) for the selective and effectual adsorption of phosphate (PO43-) ions. A higher adsorption capacity of MF-L@CB (6.6 mg/g) toward PO43- ions than coffee waste...

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Main Authors: Jaegwan Shin, Hojung Rho, Yeonjung Cho, Jinwoo Kwak, Changgil Son, Sangwon Kim, Seohyun Ki, Yong-Gu Lee, Hee-Joong Kim, Sang-Ho Lee, Yongeun Park, Kangmin Chon
Format: Article
Language:English
Published: Elsevier 2025-01-01
Series:Desalination and Water Treatment
Subjects:
Biochars
Coffee wastes
Phosphorus
Mg/Fe layered double hydroxides
Adsorption mechanisms
Online Access:http://www.sciencedirect.com/science/article/pii/S1944398625000062
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Summary:This study rigorously evaluated the viability of Mg/Fe layered double hydroxides (LDH) decorated biochars produced from coffee wastes (MF-L@CB) for the selective and effectual adsorption of phosphate (PO43-) ions. A higher adsorption capacity of MF-L@CB (6.6 mg/g) toward PO43- ions than coffee waste biochars (CB; 2.4 mg/g) was mainly because of the increased metal and anion components through the Mg/Fe LDH decoration. Based on the obtained experimental results, the adsorptive removal of PO43- ions by CB and MF-L@CB was chiefly governed by chemisorption and intra-particle diffusion. In addition, the removal of PO43- ions by CB and MF-L@CB occurred endothermically and spontaneously. The variations in the main adsorptive removal mechanisms of PO43- ions by CB from the ligand exchange with alcohol functional groups to the anion exchange with Cl and electrostatic surface complexation with metal contents via the Mg/Fe LDH decoration could significantly improve the selectivity of PO43- ions (decreasing rate of Qe under the co-existing anions: CB = 26.7–98.7 % and MF-L@CB = 1.9–44.2 %). Hence, the decoration of the Mg/Fe LDH particles on the surfaces of CB might be a promising method to improve the adsorption capacity and selectivity of PO43- ions.
ISSN:1944-3986

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