Adsorption of Pb2+, Cu2+ and Cd2+ by sulfhydryl modified chitosan beads

A chitosan-based bead was synthesized by crosslinking as well as sulfhydryl modification reaction and its removal ability of Pb2+, Cu2+ and Cd2+ was investigated. The test results showed that the crystal structure of chitosan was destroyed completely and the specific surface area was greatly increas...

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Veröffentlicht in:Carbohydrate polymers 2021-11, Vol.274, p.118622-118622, Article 118622
Hauptverfasser: Yang, Yuru, Zeng, Lei, Lin, Zongkun, Jiang, Huabin, Zhang, Aiping
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Sprache:eng
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Zusammenfassung:A chitosan-based bead was synthesized by crosslinking as well as sulfhydryl modification reaction and its removal ability of Pb2+, Cu2+ and Cd2+ was investigated. The test results showed that the crystal structure of chitosan was destroyed completely and the specific surface area was greatly increased after modification. The adsorption of Pb2+, Cu2+ and Cd2+ by the beads was carried out at different pH, ionic strength, contact time and initial concentration and the maximum adsorption capacities were 273.7 mg/g, 163.3 mg/g and 183.1 mg/g, respectively. Furthermore, due to the large ion radius of Pb2+, its adsorption was seriously disturbed by other ions in the competitive adsorption process. Finally, the adsorption processes of Pb2+, Cu2+ and Cd2+ were well fitted by the Langmuir isotherm model and the pseudo second-order kinetics model, respectively. Combined with the results of X-ray photoelectron spectroscopy, chemical coordination is the main adsorption mechanism. •Synthesis of DMSA-CS beads through crosslinking and sulfhydryl modification.•DMSA-CS beads have a good removeeffect on Pb2+, Cu2+ and Cd2+ in a wide pH range.•The adsorption processes were fitted by different isotherms and kinetic models.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2021.118622