Heavy metal sequestration with a boronic acid-functionalized carbon-based adsorbent. Issue 1 (February 2018)

• Record Type: Journal Article
• Authors: Kettum, Wachiraporn; Tran, Thi Tuong Vi; Kongparakul, Suwadee; Reubroycharoen, Prasert; Guan, Guoqing; Chanlek, Narong; Samart, Chanatip
• Is Part Of: Journal of environmental chemical engineering. Volume 6:Issue 1(2018)
• Page Start: 1147
• Page End: 1154
• Publication Date: 2018-02
• Subjects: Carbon microsphere -- Hydrothermal carbonization -- Adsorbent -- Heavy metal removal -- Boronic acid; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2018.01.043
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: Boronic-acid-functionalized carbon spheres achieve in heavy metal removal. Adsorbent is made by simple consequent hydrothermal carbonization of xylose and functionalization technique. Adsorption kinetics for heavy metals tested exhibit a pseudo-second order. Adsorption isotherms for all tested metals could be fitted using Freundlich model. Abstract: Highly efficient heavy metal adsorption was achieved using carbon microspheres (CMs) functionalized with boronic acid (B-CMs). The adsorbent B-CMs were prepared by hydrothermal carbonization of xylose and subsequent functionalization. They had a nonporous structure with a surface area of 76.1 m 2 /g and the presence of boronic acids on their surface was confirmed using Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy. The distribution of boronic acid on the surface of the B-CMs was analyzed using energy-dispersive X-ray spectroscopy. The adsorption kinetics for Cu(II), Ni(II), and Cr(VI) ions best fitted a pseudo-second-order model, while the adsorption isotherms best fitted the Freundlich model, with Ni(II) showing the highest adsorption capacity. The adsorption capacity for these three metal ions decreased by less than 10% and 15–25% after one and three uses, respectively. Thus, considering that the B-CMs showed high adsorption capacities and were derived from agricultural waste (xylose) by a simple hydrothermal process, they seem highly suited for use as efficient and environment-friendly heavy metal adsorbents.