ENVR 268 |
| Bin Hua and Baolin Deng. Department of Civil and Environmental Engineering, University of Missouri-Columbia, Columbia, MO 65211 |
| Cr(VI) reduction by gaseous H2S was examined under various relative humidity and reactant concentration conditions, and by using Cr(VI) compounds with varying solubilities. Glass beads of various sizes were used as matrices to support K2CrO4, CaCrO4, PbCrO4 or BaCrO4, and reaction progresses were monitored by Cr(VI) analysis following solution extraction. The results showed that Cr(VI) reduction relied on both the relative humidity of the gaseous stream and the size of particles. The relative humidity required for fast Cr(VI) reduction increased when particle sizes were increased. It was believed that a water film formed on the particle surfaces under appropriate humidity conditions, resulting in Cr(VI) compound dissolution and subsequent reduction. Cr(VI) compounds such as PbCrO4 and BaCrO4 showed no reduction under the experimental conditions because they were not soluble. |
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Physicochemical Processes in Environmental Systems: A Symposium in Honor of Professor Walter J. Weber, Jr
8:30 AM-12:20 PM, Thursday, September 11, 2003 Javits Convention Center -- 1A24, Oral
Division of Environmental Chemistry |