Cr(VI) adsorption onto hydrous concrete particles from groundwater

Authors
Weng, CH Huang, CP Allen, HE Sanders, PF
Citation
Ch. Weng et al., Cr(VI) adsorption onto hydrous concrete particles from groundwater, J ENV ENG, 127(12), 2001, pp. 1124-1131
Citations number
41
Categorie Soggetti
Environment/Ecology,"Environmental Engineering & Energy
Journal title
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE
ISSN journal
07339372 → ACNP
Volume
127
Issue
12
Year of publication
2001
Pages
1124 - 1131
Database
ISI
SICI code
0733-9372(200112)127:12<1124:CAOHCP>2.0.ZU;2-N
Abstract
Adsorption of Cr(VI) onto hydrous concrete particles in synthetic groundwat er was investigated with batch equilibrium adsorption experiments. Results show marked adsorption under acidic conditions, and the amount of Cr(VI) ad sorbed decreases with increasing solution pH and surface loading. A surface complex formation model was employed to describe the adsorption of Cr(VI) onto concrete particles. The adsorption-free energy of HCrO4+ and CrO42+ sp ecies are -6.16 and -8.53 kcal/mol, respectively. Results also indicate tha t specific chemical interaction is the major mechanism responsible for the adsorption process.