Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 283, Issue -, Pages 70-79Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2014.08.053
Keywords
Fe-Co/SBA-15; Sulfate radicals; Ultrasound; Peroxymonosulfate; Toxicity
Categories
Funding
- Natural Science Foundation of China [20977069, 21211130108]
- Natural Science Foundation of Hubei Province, China [2007ABB028]
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Mesoporous silica SBA-15 supported iron and cobalt (Fe-Co/SBA-15) was prepared and used as catalyst in the ultrasound (US) enhanced heterogeneous activation of peroxymonosulfate (PMS, HSO5-) process. The effects of some important reaction parameters on the removal of Orange II by US/Fe-Co/SBA-15/PMS process were investigated. The results indicated that the removal rate of Orange II was not significantly affected by the initial pH, and it increased with the higher PMS concentration, reaction temperature, Fe-Co/SBA-15 dosage and ultrasonic power. Furthermore, sulfate radicals (SO4-center dot) were assumed to be the dominating reactive species for the Orange II decolorization. Moreover, the Fe-Co/SBA-15 catalyst showed high activity during the repeated experiments. The intermediate products were identified by GC-MS, thereby a plausible degradation pathway is proposed. In addition, the chemical oxygen demand (COD) removal efficiencies at 2 and 24h were 56.8% and 80.1%, respectively and the corresponding total organic carbon (TOC) removal efficiencies were 33.8 and 53.3%. Finally, toxicity tests with activated sludge showed that the toxicity of the solution increased during the first stage and then decreased significantly with the progress of the oxidation. (C) 2014 Elsevier B.V. All rights reserved.
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