Modeling and mechanism of the adsorption of copper ion onto natural bamboo sawdust

Xue Tao Zhao, Teng Zeng, Xue Yan Li, Zhang Jun Hu, Hong Wen Gao, Zhi Xie

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

The sorption of copper ions onto natural bamboo sawdust with cellulose-lignin polymeric structure strongly depends on pH. The adsorption capacity for copper ions increases as increasing pH and copper loadings. The fitting of copper pH boundary curve by NEM surface complexation models shows that: three-sites model including the ion exchange reaction of permanent charge fits better than two-sites model. The incorporation of the hydrated ion reaction gives better fitting results. XAFS study shows that: copper ions mainly form inner complexation with sawdust, but there is no obvious evidence on the complexation of carboxylic acid groups with copper ions. EXAFS fittixng result shows that: as pH rises, the spatial configuration of copper ions shifts from tetrahedron to octahedron. Meanwhile the increase in the coordination number indicates that hydrated copper ions participate in the adsorption. Both XANES and EXFAS spectrum offer a similar explanation for copper adsorption in the range of experimental and fitting errors.

Original languageEnglish (US)
Pages (from-to)185-192
Number of pages8
JournalCarbohydrate Polymers
Volume89
Issue number1
DOIs
StatePublished - Jun 5 2012
Externally publishedYes

Keywords

  • Cu
  • Sawdust
  • Sorption
  • Surface complexation model (SCM)
  • XAFS

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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