naa a22 4500 510751075 CHVBK 20180411083104.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1007/s11270-013-1740-9 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1740-9 Discoloration of Methyl Orange in the Presence of Schorl and H2O2: Kinetics and Mechanism [Elektronische Daten] [Huan-Yan Xu, Tian-Nuo Shi, Li-Cheng Wu, Shu-Yan Qi] Kinetics and mechanism on discoloration of an azo dye, methyl orange (MO), by heterogeneous Fenton-like reaction using natural schorl as catalyst were investigated in this study. Among the three kinetic models (the first-order, the second-order, and the Behnajady-Modirshahla-Ghanbery (BMG)), the BMG kinetic model was the best one to describe MO discoloration at different reaction conditions, due to its highest determination coefficients. The BMG model parameter, 1/m, increased with initial hydrogen peroxide (H2O2) concentration, and schorl dosage and reaction temperature increased while the pH solution decreased. The phenomenon indicated that the initial MO discoloration rate increased with the ascending of the initial H2O2 concentration, schorl dosage, and reaction temperature and the descending of the pH solution. Meanwhile, another BMG parameter, 1/b, except for the one at pH = 5, were all around 1, implying that the schorl-catalyzed Fenton-like reaction had high capacity for MO discoloration. The possible reason for these phenomena was interpreted from the point of view of OH generation and Fe dissolution. Generally speaking, the amount of hydroxyl radicals increased with initial H2O2 concentration, increased schorl dosage and reaction temperature, and decreased pH solution, playing an important role in the change of 1/m values. The concentration of soluble iron ions at all adopted experimental conditions ranged from 0.23 to 1.14mg/L, much lower than the European Union directive (2mg/L), which demonstrated that natural schorl would be a promising heterogeneous catalyst for the Fenton-like reaction. Finally, a possible mechanism for this process was put forward. Springer Science+Business Media Dordrecht, 2013 Schorl nationallicence Methyl orange nationallicence Fenton-like nationallicence Kinetics nationallicence Mechanism nationallicence Xu Huan-Yan School of Material Science & Engineering, Harbin University of Science & Technology, 150040, Harbin, People's Republic of China aut Shi Tian-Nuo School of Material Science & Engineering, Harbin University of Science & Technology, 150040, Harbin, People's Republic of China aut Wu Li-Cheng School of Material Science & Engineering, Harbin University of Science & Technology, 150040, Harbin, People's Republic of China aut Qi Shu-Yan School of Material Science & Engineering, Harbin University of Science & Technology, 150040, Harbin, People's Republic of China aut Water, Air, & Soil Pollution Springer Netherlands 224/10(2013-10-01), 1-11 0049-6979 224:10<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1740-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1740-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Xu Huan-Yan School of Material Science & Engineering, Harbin University of Science & Technology, 150040, Harbin, People's Republic of China aut NATIONALLICENCE 700 1- Shi Tian-Nuo School of Material Science & Engineering, Harbin University of Science & Technology, 150040, Harbin, People's Republic of China aut NATIONALLICENCE 700 1- Wu Li-Cheng School of Material Science & Engineering, Harbin University of Science & Technology, 150040, Harbin, People's Republic of China aut NATIONALLICENCE 700 1- Qi Shu-Yan School of Material Science & Engineering, Harbin University of Science & Technology, 150040, Harbin, People's Republic of China aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/10(2013-10-01), 1-11 0049-6979 224:10<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer