Adsorption behaviors on trace Pb from water of biochar adsorbents from konjac starch

Autor: Yinhui Li, Longfei Peng, Weixin Li
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Adsorption Science & Technology, Vol 38 (2020)
Druh dokumentu: article
ISSN: 0263-6174
2048-4038
02636174
DOI: 10.1177/0263617420948699
Popis: Biochar adsorbents used to treat different heavy metals in water are efficient and low-cost. Appropriate raw materials, excellent selectivity and detailed adsorption mechanism are of important for research on biochar adsorbents. In this work, konjac starch was dispersed in polyvinylpyrrolidone (PVP) solution to prepare different sizes hydrophilic carbon spheres (HCSs) by hydrothermal synthesis method. Adsorption kinetics of the HCSs towards Pb 2+ is described perfectly by the pseudo-second-order equation. With the temperature increasing, adsorption thermodynamics are more consistent with the Freundlich model. The calculated ΔG, ΔH and ΔS shows the adsorption of the HCSs towards Pb 2+ is a spontaneous, endothermic and entropy increase process. In addition, HCSs have excellent selectivity for the adsorption of Pb 2+ and Cu 2+ . HCSs prepared from konjac starch make full use of natural biomass resources, they can be used as a potential adsorbent material in treatment on heavy metal ion from water field.
Databáze: Directory of Open Access Journals
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