Effect of oxygen-containing functional group contents on sorption of lead ions by acrylate-functionalized hydrochar.

Autor: Yu K; College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, PR China., Huan WW; College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, PR China., Teng HJ; College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, PR China., Guo JZ; College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, PR China., Li B; College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, PR China. Electronic address: libingzjfc@163.com.
Jazyk: angličtina
Zdroj: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2024 May 15; Vol. 349, pp. 123921. Date of Electronic Publication: 2024 Apr 03.
DOI: 10.1016/j.envpol.2024.123921
Abstrakt: The surface functional groups of hydrochar are crucial to its surface properties, and their contents are strongly positively correlated with the adsorption performance. In this study, acrylate-functionalized hydrochar (AHC) with varying contents of O-containing functional groups (OFGs) was synthesized via hydrothermal carbonization (HTC) of bamboo, acrylic acid and an initiator, and then deprotonated with NaOH. The AHCs were analyzed by various characterization techniques. During HTC, the higher amount of acrylic acid added led to higher carbon, oxygen and carboxyl contents, and to the larger specific surface area and pore volume of AHC. The adsorption kinetics, isotherms, thermodynamic, ionic strength and pH effects of Pb(II) on AHC were studied. Adsorption isotherms and kinetics obeyed Langmuir and pseudo-second-order models, respectively, indicating adsorption is monolayer chemical process. The adsorptive ability was well linearly related to the OFG contents of AHC. When acrylic acid was added to 25 mL during HTC, the adsorbing ability of AHC over Pb(II) reached 193.90 mg g -1 . Hence, direct HTC of acrylic acid, biomass and an initiator can prepare hydrochar with controllable OFG contents, which is a prospective adsorbent for treating metal cations.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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