Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2006, Vol. 27 ›› Issue (5): 445-448.

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Catalytic Degradation of Methylorange in Water by Derivable Oxidation with Peroxydisulfate

ZHANG Naidong1*, ZHANG Manxia1, PENG Yongzhen2   

  1. 1 College of Environmental Science and Engineering, Dalian Maritime University, Dalian 116026, Liaoning, China; 2 Key Laboratory of Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100022, China
  • Received:2006-05-25 Online:2006-05-25 Published:2006-05-25

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Abstract: S2O2-8 can be transformed into Ag2+and SO-4• by catalysis of Ag+. Ag2+ and SO-4• are strong oxidants (E0Ag2+/Ag+=1.989 V, E0SO-4•/SO2-4=3.64 V). The degradation of methylorange in S2O2-8+Ag+ system was studied with the measurements of ultraviolet spectrometry, total organic carbon [HJ30x](TOC), and high performance liquid chromatography-mass spectrometry. When pH=1, the dye decolorization efficiency of 5 μmol/L methylorange was up to 100% after 8 min reaction in the S2O2-8+Ag+ system. Suspending grains were observed in water after reaction for 2 h, and the TOC removal efficiency was up to 8.6%. TOC removal efficiency was 10% by Fenton method under the same conditions. Considering the enhancement on organism mineralization, S2O2-8+Ag+ and Fenton methods show the similar efficiency.

Key words: peroxydisulfate, silver ion, sulfate radical anion, methylorange