TY - JOUR
T1 - Degradation of azo dye with activated peroxygens
T2 - When zero-valent iron meets chloride
AU - Wang, Zhaohui
AU - Ai, Luoyan
AU - Huang, Ying
AU - Zhang, Juekai
AU - Li, Sitong
AU - Chen, Jiawei
AU - Yang, Fei
N1 - Publisher Copyright:
© 2017 The Royal Society of Chemistry.
PY - 2017
Y1 - 2017
N2 - Degradation of acid orange 7 (AO7) by Fe-based Advance Oxidation Process (AOPs) with common peroxygens, persulfate (PS), peroxymonosulfate (PMS) and hydrogen peroxide (H2O2), was investigated, in which sulfate radicals (SO4-) and/or hydroxyl radicals (OH) are powerful oxidizing species. The effects of Fe dosage, peroxygen concentration, initial pH and the presence of chloride on the degradation of AO7 were examined. The AO7 degradation efficiencies by four systems, including Fe, Fe/H2O2, Fe/PMS and Fe/PS were compared. AO7 degradation rate by Fe activated AOPs in descending order is H2O2 ≧ PS > PMS. Increasing acidity and iron dosage favored a rapid degradation of AO7. The presence of chloride greatly inhibited dye removal in Fe/H2O2 and Fe/PS systems, whilst accelerated dye degradation was observed in the Fe/PMS system. In contrast, mineralization of AO7 in the Fe/PMS/Cl- system was minimal, because of formation of lots of refractory chlorinated phenols as identified by GC-MS. These findings are useful for selecting the most appropriate technology for textile wastewater treatment, depending on the wastewater constituents and pH.
AB - Degradation of acid orange 7 (AO7) by Fe-based Advance Oxidation Process (AOPs) with common peroxygens, persulfate (PS), peroxymonosulfate (PMS) and hydrogen peroxide (H2O2), was investigated, in which sulfate radicals (SO4-) and/or hydroxyl radicals (OH) are powerful oxidizing species. The effects of Fe dosage, peroxygen concentration, initial pH and the presence of chloride on the degradation of AO7 were examined. The AO7 degradation efficiencies by four systems, including Fe, Fe/H2O2, Fe/PMS and Fe/PS were compared. AO7 degradation rate by Fe activated AOPs in descending order is H2O2 ≧ PS > PMS. Increasing acidity and iron dosage favored a rapid degradation of AO7. The presence of chloride greatly inhibited dye removal in Fe/H2O2 and Fe/PS systems, whilst accelerated dye degradation was observed in the Fe/PMS system. In contrast, mineralization of AO7 in the Fe/PMS/Cl- system was minimal, because of formation of lots of refractory chlorinated phenols as identified by GC-MS. These findings are useful for selecting the most appropriate technology for textile wastewater treatment, depending on the wastewater constituents and pH.
UR - https://www.scopus.com/pages/publications/85021671426
U2 - 10.1039/c7ra03872k
DO - 10.1039/c7ra03872k
M3 - 文章
AN - SCOPUS:85021671426
SN - 2046-2069
VL - 7
SP - 30941
EP - 30948
JO - RSC Advances
JF - RSC Advances
IS - 49
ER -