Adsorption of Pb2+ and Cu2+ ions on the CS2-modified alkaline lignin

Qiaorui Wang, Chunli Zheng, Wei Cui, Fei He, Jianyu Zhang, Tian C. Zhang, Chi He

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

A kind of alkaline lignin (AL)-based modified material (FLAL) was fabricated, in which CS2 was selected as the modifier. FLAL can be used to treat Pb2+ and Cu2+ ions loaded water. When the initial concentrations of Pb2+ and Cu2+ ions were 30 mg/L, the removal efficiencies were 97% for Pb2+ at 100 min while 98% for Cu2+ at 5 min, respectively. The maximum adsorption capacities (qm) of Pb2+ and Cu2+ ions were 0.322 and 1.010 mmol/g, indicating that the adsorption capacity of FLAL for Cu2+ ions was better than for Pb2+ ions. The groups of hydroxyl, methoxyl and dithiocarbamate carried by FLAL contributed to binding with Pb2+/Cu2+ ions. Dithiocarbamate ([sbnd]CSS[sbnd]) was proved to be the primary active site, in which the binding energy (Ead) of S[sbnd]Cu[sbnd]S and S[sbnd]Pb[sbnd]S were −1.1739 and −0.8709 Ha. These results suggest the interaction between FLAL and Cu2+ ions was stronger and FLAL-Cu2+ complexes were more stable, revealing the reason why the uptake of Cu2+ ions by FLAL was quicker in speed and larger in amount. The reusing ability of FLAL was evaluated through a four-adsorption–desorption cycle. The values of qm for Pb2+ and Cu2+ ions were 0.258 and 0.878 mmol/g corresponding to the fourth regeneration, decreased by 19.87% and 13.06% compared to fresh FLAL. The adsorption performance of both fresh and regenerated FLAL is better than many other biomass-based adsorbents. FLAL can be regarded as a promising material with high application potential, which warrants future studies on optimizing FLAL for real-world applications.

Original languageEnglish (US)
Article number123581
JournalChemical Engineering Journal
Volume391
DOIs
StatePublished - Jul 1 2020

Keywords

  • Adsorption
  • Alkaline lignin
  • Carbon disulfide modification
  • Cu ions
  • Pb ions

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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