Chromium adsorption by lignin
Hexavalent chromium is a known carcinogen, and its maximum contamination level in drinking water is determined by the US Environmental Protection Agency (EPA). Chromium in the wastewaters from plating and metal finishing, tanning, and photographic industries poses environmental problems. A commercially available lignin was used for the removal of hexavalent as well as trivalent chromium from aqueous solution. It is known that hexavalent chromium is present as an anionic species in the solution. It was found that lignin can remove up to 63% hexavalent and 100% trivalent chromium from aqueous solutions. The removal of chromium ions was also investigated using a commercially available activated carbon. This absorbent facilitated very little hexavalent and almost complete trivalent chromium removal. Adsorption isotherms and kinetics data on the metal removal by lignin and activated carbon are presented and discussed.
- Research Organization:
- Southern Illinois Univ., Carbondale, IL (US)
- OSTI ID:
- 20014033
- Journal Information:
- Energy Sources, Vol. 22, Issue 1; Other Information: PBD: Jan 2000; ISSN 0090-8312
- Country of Publication:
- United States
- Language:
- English
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