Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 26, Issue 6, Pages 1267-1273Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(13)60598-7
Keywords
Fe-Co/GAC; ultrasound; heterogeneous catalysis; peroxydisulfate; sulfate radicals
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Funding
- National Natural Science Foundation of China [20977069, 21211130108]
- Natural Science Foundation of Hubei Province, China through The Outstanding Youth Scholars Program [2007ABB028]
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Bimetallic Fe-Co/GAC (granular activated carbon) was prepared and used as heterogeneous catalyst in the ultrasound enhanced heterogeneous activation of peroxydisulfate (PS, S2O82-) process. The effect of initial pH, PS concentration, catalyst addition and stirring rate on the decolorization of Acid Orange 7 (AO7) was investigated. The results showed that the decolorization efficiency increased with an increase in PS concentration from 0.3 to 0.5 g/L and an increase in catalyst amount from 0.5 to 0.8 g/L. But further increase in PS concentration and catalyst addition would result in an unpronounced increase in decolorization efficiency. In the range of 300 to 900 r/min, stirring rate had little effect on AO7 decolorization. The catalyst stability was evaluated by measuring decolorization efficiency for four successive cycles.
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