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Involvements of chloride ion in decolorization of Acid Orange 7 by activated peroxydisulfate or peroxymonosulfate oxidation.
J Environ Sci (China). 2011; 23(11):1799-807.JE

Abstract

The effects of chloride anion (Cl-) (up to 1.0 mol/L) on the decolorization of a model compound, azo dye Acid Orange 7 (AO7), by sulfate radical (SO4-*) based-peroxydisulfate (PS) or peroxymonosulfate (PMS) oxidation under various activated conditions (UV254 nm/PS, Thermal (70 degrees C/PS, UV254 nm/PMS, Co2+/PMS) were investigated. Methanol and NH4+ were used as quenching reagents to determine the contributions of active chlorine species (dichloride radical (Cl2-*) and hypochlorous acid (HClO)). The results indicated that the effects of Cl- on the reaction mechanism were different under various activated conditions. For UV/PS and Thermal/PS, the inhibition tendency became more clear as the Cl- concentration increased, probably due to the reaction between Cl- and SO4-* and the generation of Cl2-* or HCIO. For UV/PMS, Cl- did not exhibit inhibition when the concentration was below 0.1 mol/L. As Cl- concentration reached to 1.0 mol/L, the decolorization rate of AO7 was, however, accelerated, possibly because PMS directly reacts with Cl- to form HClO. For Co2+/PMS, Cl- exhibited a significant inhibiting effect even at low concentration (< or = 0.01 mol/L). When Cl- concentration exceeded 0.1 mol/L, the activation of PMS by Co2+ was almost completely inhibited. Under this condition, HClO maybe played a major role in decolorization of AO7. The results implicated that chloride ion is an important factor in SO4(-*) -based degradation of organic contamination in chloride-containing water.

Authors+Show Affiliations

Key Laboratory of Marine Environment and Ecology, Ministry of Education, Qingdao 266100, China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22432303

Citation

Wang, Ping, et al. "Involvements of Chloride Ion in Decolorization of Acid Orange 7 By Activated Peroxydisulfate or Peroxymonosulfate Oxidation." Journal of Environmental Sciences (China), vol. 23, no. 11, 2011, pp. 1799-807.
Wang P, Yang S, Shan L, et al. Involvements of chloride ion in decolorization of Acid Orange 7 by activated peroxydisulfate or peroxymonosulfate oxidation. J Environ Sci (China). 2011;23(11):1799-807.
Wang, P., Yang, S., Shan, L., Niu, R., & Shao, X. (2011). Involvements of chloride ion in decolorization of Acid Orange 7 by activated peroxydisulfate or peroxymonosulfate oxidation. Journal of Environmental Sciences (China), 23(11), 1799-807.
Wang P, et al. Involvements of Chloride Ion in Decolorization of Acid Orange 7 By Activated Peroxydisulfate or Peroxymonosulfate Oxidation. J Environ Sci (China). 2011;23(11):1799-807. PubMed PMID: 22432303.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Involvements of chloride ion in decolorization of Acid Orange 7 by activated peroxydisulfate or peroxymonosulfate oxidation. AU - Wang,Ping, AU - Yang,Shiying, AU - Shan,Liang, AU - Niu,Rui, AU - Shao,Xueting, PY - 2012/3/22/entrez PY - 2011/1/1/pubmed PY - 2012/5/1/medline SP - 1799 EP - 807 JF - Journal of environmental sciences (China) JO - J Environ Sci (China) VL - 23 IS - 11 N2 - The effects of chloride anion (Cl-) (up to 1.0 mol/L) on the decolorization of a model compound, azo dye Acid Orange 7 (AO7), by sulfate radical (SO4-*) based-peroxydisulfate (PS) or peroxymonosulfate (PMS) oxidation under various activated conditions (UV254 nm/PS, Thermal (70 degrees C/PS, UV254 nm/PMS, Co2+/PMS) were investigated. Methanol and NH4+ were used as quenching reagents to determine the contributions of active chlorine species (dichloride radical (Cl2-*) and hypochlorous acid (HClO)). The results indicated that the effects of Cl- on the reaction mechanism were different under various activated conditions. For UV/PS and Thermal/PS, the inhibition tendency became more clear as the Cl- concentration increased, probably due to the reaction between Cl- and SO4-* and the generation of Cl2-* or HCIO. For UV/PMS, Cl- did not exhibit inhibition when the concentration was below 0.1 mol/L. As Cl- concentration reached to 1.0 mol/L, the decolorization rate of AO7 was, however, accelerated, possibly because PMS directly reacts with Cl- to form HClO. For Co2+/PMS, Cl- exhibited a significant inhibiting effect even at low concentration (< or = 0.01 mol/L). When Cl- concentration exceeded 0.1 mol/L, the activation of PMS by Co2+ was almost completely inhibited. Under this condition, HClO maybe played a major role in decolorization of AO7. The results implicated that chloride ion is an important factor in SO4(-*) -based degradation of organic contamination in chloride-containing water. SN - 1001-0742 UR - https://www.unboundmedicine.com/medline/citation/22432303/Involvements_of_chloride_ion_in_decolorization_of_Acid_Orange_7_by_activated_peroxydisulfate_or_peroxymonosulfate_oxidation_ DB - PRIME DP - Unbound Medicine ER -