Issue 43, 2023, Issue in Progress

KOH-modified bamboo charcoal loaded with α-FeOOH for efficient adsorption of copper and fluoride ions from aqueous solution

Abstract

In this work, bamboo charcoal (BC) is prepared by pyrolysis of bamboo. Then, KOH modification and surface deposition of Goethite (α-FeOOH) are performed to obtain a new KOH-modified BC loaded with α-FeOOH (FKBC) adsorbent for copper (Cu2+) and fluoride (F) ion adsorption from aqueous solution. Surface morphology and physiochemical properties of the prepared adsorbent are characterized by scanning electron microscopy-energy dispersive spectrometer, X-ray diffraction, and N2 adsorption–desorption. The effect of pH, contact time, adsorbent dosage, and initial concentration on Cu2+ and F adsorption is also investigated. In addition, adsorption kinetics and isotherms are fitted to pseudo-second-order kinetics and Langmuir model, respectively. Thermodynamic parameters suggest that the adsorption process is spontaneous and endothermic. The adsorption mechanism is further characterized by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The Cu2+ absorption mainly occurs through ion exchange, coordination reactions, and surface precipitation, while the F adsorption mainly occurs via ion exchange and hydrogen bonding. The selective adsorption experiments reveal that FKBC has good selectivity for Cu2+ and F. The adsorption–desorption experimental results indicate that FKBC can be reused for Cu2+ and F adsorption after regeneration. Results indicate that FKBC can be a promising adsorbent for Cu2+ and F removal from aqueous solutions.

Graphical abstract: KOH-modified bamboo charcoal loaded with α-FeOOH for efficient adsorption of copper and fluoride ions from aqueous solution

Supplementary files

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Article information

Article type
Paper
Submitted
07 Aug 2023
Accepted
09 Oct 2023
First published
16 Oct 2023
This article is Open Access
Creative Commons BY license

RSC Adv., 2023,13, 30176-30189

KOH-modified bamboo charcoal loaded with α-FeOOH for efficient adsorption of copper and fluoride ions from aqueous solution

W. Yang, L. Zhang, M. Li, T. Zhang, Y. Liu and J. Liu, RSC Adv., 2023, 13, 30176 DOI: 10.1039/D3RA05315F

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