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Highly selective recovery of phosphate ions using a novel carbonaceous adsorbent synthesized via co-pyrolysis of spent coffee grounds and steel slags: A potential phosphatic fertilizer by Jaegwan Shin; Jinwoo Kwak; Sangwon Kim; Changgil Son; Yong-Gu Lee; Jonggu Kim; Sungjun Bae; Yongeun Park; Sang-Ho Lee; Kangmin Chon is a Engineering article available to read on EtoBox.

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This study rigorously investigated the viability of carbonaceous adsorbents (SS@SCA) prepared through one-step co-pyrolysis of steel slags (SSs) and spent coffee grounds (SCGs) for selectively capturing phosphate (PO4 3−) ions in aqueous solutions and their subsequent utilizing a phosphatic fertilizer to promote the plant growth. The higher PO4 3− adsorption capacity (Qe = 23.0 mg/g) and magnetic separability (90.1%) of SS@SCA compared to pristine carbonaceous adsorbents (SCA) prepared through simple pyrolysis of SCGs (Qe = 2.6 mg/g) were mainly attributed to the enriched metal oxides on its surfaces (i.e., CaO, MgO, Fe3O4, Fe2O3, Al2O3). Moreover, the main adsorption mechanism of PO4 3− ions toward SCA was changed from physisorption (ligand exchange by alcohol functional groups) to chemisorption (electrostatic surface complexation by CaO and MgO) via one-step co-pyrolysis of SCGs and SSs. This phenomenon enabled SS@SCA to selectively capture PO4 3− ions under the co-existence of Cl−, NO3 −, SO4 2−, and CO3 2− ions (decreasing rates of Qe: SCA = 38.5–65.4%; SS@SCA = 0.8–8.8%). PO4 3−-loaded SS@SCA more effectively promoted the seed germination (germination index (GI): 434–467%) and

Who reads Highly selective recovery of phosphate ions using a novel carbonaceous adsorbent synthesized via co-pyrolysis of spent coffee grounds and steel slags: A potential phosphatic fertilizer?

Author

Jaegwan Shin; Jinwoo Kwak; Sangwon Kim; Changgil Son; Yong-Gu Lee; Jonggu Kim; Sungjun Bae; Yongeun Park; Sang-Ho Lee; Kangmin Chon

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)