Journal
CHEMOSPHERE
Volume 173, Issue -, Pages 529-534Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.01.093
Keywords
Peroxymonosulfate activation; Singlet oxygen; Radical quenching; Degradation
Categories
Funding
- National Natural Science Foundation of China [41273108, 21377023, 21677031]
- DHU Distinguished Young Professor Program
- Shanghai Pujiang Program
- Chinese Universities Scientific Fund [13D311303, 14D311304]
- Shanghai Sailing Program [15YF1404300]
- Shanghai Chen Guang Program [15CG60]
- Shanghai University Youth Teacher Funding Program [ZZZZEGD15011]
- Scientific Research Fund Project of Shanghai Second Polytechnic University [EGD15XQD02]
- Shanghai Cooperative Centre for WEEE Recycling [ZF1224]
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Base activation of peroxydisulfate (PDS) is a common process aiming for water treatment, but requires high doses of PDS and strongly basic solutions. Peroxymonosulfate (PMS), another peroxygen of sulfurate derived from PDS, may also be activated by a less basic solution. However, enhancing the base-PMS reactivity is still challenging. Here it is reported that pyrophosphate (PA) and tripolyphosphate (PB) can efficiently enhance PMS activation under weakly alkaline conditions (pH 9.5) via the formation of superoxide anion radical (O-2(center dot-)) and singlet oxygen (102). The rate constant of Acid Orange 7 (AO7) degradation in PA/PMS system (kpAiPms) was nearly 4.4-15.9 fold higher than that in PMS/base system. (kpmsibase) without any polyphosphates. Increases in PA (or PB) concentration, PMS dose and pH favored the rapid dye degradation. Gas chromatograph-mass spectrometer (GC-MS) data confirmed AO7 and 2,4,6-trichlorophenol (2,4,6-TCP) were decomposed to a series of organic intermediates. The radical quenching and probe oxidation experiments indicate the degradation of organic compounds in the PA/PMS and PB/PMS processes was not reliant on sulfate radical (SO4) and hydroxyl radical (center dot OH) species but on O-2(center dot-) and O-1(2) reactive species. Comparison experiments show that the polyphosphate/PMS process was much more favorable than PDS/base process. The present work provides a novel way to activate PMS for contaminant removal using industrial polyphosphate wastewaters. (C) 2017 Elsevier Ltd. All rights reserved.
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