Species resolved interaction mechanism between graphene oxide and Cu(II) in aqueous solution with implications on wastewater remediation

Heavy metals discharged into water by industrial activity give rise to severe environmental pollution. Herein, graphene oxide (GO) was prepared based on an improved Hummers method and utilized as adsorbent to remove aqueous Cu(II). The “species resolved” adsorption mechanism was deeply inspected via...

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Bibliographic Details
Published in:The Korean journal of chemical engineering 2023, 40(1), 274, pp.162-174
Main Authors: Bulin, Chaoke, Guo, Ting, Zhao, Ruichao, Zheng, Rongxiang, Zhang, Bangwen, Liu, Fang
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aqueous solutions
Biotechnology
Catalysis
Chemical precipitation
Chemistry
Chemistry and Materials Science
Complexation
Electron transfer
Environmental Engineering
Graphene
Heavy metals
Industrial Chemistry/Chemical Engineering
Ion exchange
Materials Science
Scavenging
Surface charge
Wastewater treatment
화학공학
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Summary:Heavy metals discharged into water by industrial activity give rise to severe environmental pollution. Herein, graphene oxide (GO) was prepared based on an improved Hummers method and utilized as adsorbent to remove aqueous Cu(II). The “species resolved” adsorption mechanism was deeply inspected via combining multiple explorations extracted from Cu(II) species distribution, GO surface charge, adsorption experiment and fitting, hard-soft acid-base (HSAB) theory, FTIR and XPS spectra. Different adsorption mechanism resolved by Cu(II) species was proposed, corresponding to different pH range. (1) When pH8, Cu(OH) 3 − is the dominant Cu(II) species, electrostatic attraction is the adsorption mechanism. Electron transfer and energy lowering calculated based on the HSAB theory demonstrates, OH is stronger than COOH regarding binding affinity towards Cu(II). As for adsorption efficiency, adsorption of Cu(II) onto GO equilibrated in 12 min, with adsorption percent and quantity 92.32% and 553.90 mg·g −1 , respectively. Findings of this work may shed light on the interaction mechanism of graphene oxide with heavy metals. Accordingly, these as clarified mechanisms may provide guidance for developing efficient adsorbent based on graphene for heavy metal scavenging.
ISSN:0256-1115
1975-7220
DOI:10.1007/s11814-022-1211-3