Enhanced adsorption of resorcinol onto phosphate functionalized graphene oxide synthesized via Arbuzov Reaction: A proposed mechanism of hydrogen bonding and π-π interactions. (October 2021)

• Record Type: Journal Article
• Authors: Lian, Qiyu; Islam, Fahrin; Ahmad, Zaki Uddin; Lei, Xiaobo; Depan, Dilip; Zappi, Mark; Gang, Daniel D.; Holmes, William; Yan, Hui
• Is Part Of: Chemosphere. Volume 280(2021)
• Publication Date: 2021-10
• Subjects: Arbuzov reaction -- Graphene oxide -- Phosphate functionalization -- Resorcinol adsorption -- π-π interactions; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2021.130730
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Phosphate functionalized graphene oxide (PGO) was successfully prepared by Arbuzov reaction and employed for adsorption of resorcinol from an aqueous phase. The phosphate functional groups were successfully incorporated onto the PGO surface by the formation of P–C bonds as identified by the analysis of FTIR and XPS spectra. The evaluation of adsorption capacity of resorcinol onto PGO exhibited significant improvement of resorcinol removal, achieving an adsorption capacity of 50.25 mg/g in the pH range of 4–7 which was 15 times higher than pristine graphene oxide. The addition of 2.4 M and 5 M NaCl in the adsorption system significantly increased the adsorption capacity towards resorcinol from 50.25 mg/g to 82.10 mg/g and 128.10 mg/g, respectively. Based on kinetics and adsorption isotherm studies, Pseudo-First-Order and Langmuir model are the best model to describe the adsorption process indicating that the adsorption is dominantly controlled by physisorption. The thermodynamic analysis suggested that the adsorption process was the favorable, spontaneous, and endothermic process. Besides, the interplay of hydrogen bonding and π-π interactions is proposed to be the governing physisorption mechanism. The outstanding reusability and better adsorption performance make PGO a promising adsorbent for environmental remediation of resorcinol. Graphical abstract: Image 1 Highlights: Phosphate functionalized graphene oxide (PGO) is synthesized via Arbuzov Reaction. PGO performs 15 times higher than GO in the adsorption capacity of resorcinol. PGO behaves an excellent reusability for the resorcinol adsorption. The physical adsorption is identified to be the primary adsorption mechanism. The interplay of hydrogen bonding and π-π interactions enhances adsorption behavior.