Characterization of carbonated tricalcium silicate and its sorption capacity for heavy metals: A micron-scale composite adsorbent of active silicate gel and calcite

Quanyuan Chen, Colin D. Hills, Menghong Yuan, Huanhuan Liu, Mark Tyrer

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Adsorption-based processes are widely used in the treatment of dilute metal-bearing wastewaters. The development of versatile, low-cost adsorbents is the subject of continuing interest. This paper examines the preparation, characterization and performance of a micro-scale composite adsorbent composed of silica gel (15.9 w/w%), calcium silicate hydrate gel (8.2 w/w%) and calcite (75.9 w/w%), produced by the accelerated carbonation of tricalcium silicate (C3S, Ca3SiO5). The Ca/Si ratio of calcium silicate hydrate gel (C-S-H) was determined at 0.12 (DTA/TG), 0.17 (29Si solid-state MAS/NMR) and 0.18 (SEM/EDS). The metals-retention capacity for selected Cu(II), Pb(II), Zn(II) and Cr(III) was determined by batch and column sorption experiments utilizing nitrate solutions. The effects of metal ion concentration, pH and contact time on binding ability was investigated by kinetic and equilibrium adsorption isotherm studies. The adsorption capacity for Pb(II), Cr(III), Zn(II) and Cu(II) was found to be 94.4 mg/g, 83.0 mg/g, 52.1 mg/g and 31.4 mg/g, respectively. It is concluded that the composite adsorbent has considerable potential for the treatment of industrial wastewater containing heavy metals.

Original languageEnglish
Pages (from-to)775-783
Number of pages9
JournalJournal of Hazardous Materials
Volume153
Issue number1-2
Early online date10 Sep 2007
DOIs
Publication statusPublished - 1 May 2008
Externally publishedYes

Keywords

  • Adsorbent
  • Adsorption capacity
  • Heavy metal
  • Tricalcium silicate (CS)
  • Wastewater

ASJC Scopus subject areas

  • Chemical Health and Safety
  • Process Chemistry and Technology
  • Safety, Risk, Reliability and Quality
  • Environmental Engineering

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