naa a22 4500 510752616 CHVBK 20180411083110.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11270-012-1407-y doi (NATIONALLICENCE)springer-10.1007/s11270-012-1407-y Oxidation of Azo Dyes by H2O2 in Presence of Natural Pyrite [Elektronische Daten] [Deli Wu, Yong Feng, Luming Ma] Pyrite, FeS2, is the most common sulfide mineral. The aim of this work was to assess the oxidative ability of H2O2 in presence of natural pyrite by employing reactive black 5, acid red GR, and cationic red X-GRL as model pollutants. The effects of H2O2 dosage, pyrite loading, and initial pH on reaction were investigated. The results reveal that natural pyrite-promoted H2O2 has a great activity in the decoloration of azo dyes. About 85% of reactive black 5 and acid red GR can be removed within 10min when 0.3mM H2O2 and 0.3g/L pyrite are used with initial pH values ranging from 6.32 to 6.96. The discoloration efficiencies are demonstrated to be less sensitive to the initial solution pH value. Approximately 90% of discoloration for reactive black 5 and acid red GR can be achieved when initial pH value ranges from 2 to 10. Ion leaching experiments show that high levels of ferrous iron and sulfate can be detected when natural pyrite is added to dye solution alone. To gain an understanding of the reaction mechanism and the role of natural pyrite takes in these processes, techniques including scanning electron microscope, X-ray diffraction, and X-ray photoelectron were employed to characterize the solid sample and ion leaching experiments were also carried out. Results indicate that the determined high levels of ions have resulted from the dissolution of FeSO4·H2O formed on the surface of pyrite and the homogeneous Fenton reaction initiated by ferrous iron in presence of H2O2 is mainly responsible for the observed fast color removal rate. Springer Science+Business Media Dordrecht, 2012 Hydrogen peroxide nationallicence Pyrite nationallicence Oxidation nationallicence Azo dye nationallicence Wu Deli State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, 200092, Shanghai, People's Republic of China aut Feng Yong State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, 200092, Shanghai, People's Republic of China aut Ma Luming State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, 200092, Shanghai, People's Republic of China aut Water, Air, & Soil Pollution Springer Netherlands 224/2(2013-02-01), 1-11 0049-6979 224:2<1 2013 224 11270 https://doi.org/10.1007/s11270-012-1407-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-012-1407-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wu Deli State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, 200092, Shanghai, People's Republic of China aut NATIONALLICENCE 700 1- Feng Yong State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, 200092, Shanghai, People's Republic of China aut NATIONALLICENCE 700 1- Ma Luming State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, 200092, Shanghai, People's Republic of China aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/2(2013-02-01), 1-11 0049-6979 224:2<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer