tailieunhanh - Động học phản ứng khử màu của Reactive Orange 122 (RO122) bằng axít Peracetic với sự có mặt của ion kim loại và ánh sáng tử ngoại

Động học quá trình khử màu Reactive Orange 122 (RO 122) bằng axít peracetic (PAA) khi có mặt ion kim loại và ánh sáng tử ngoại ở nhiệt độ 24 ± 1 độ C được đánh giá trong nghiên cứu này. Các thí nghiệm được thực hiện trong bình phản ứng có thể tích 500 mL với điều kiện nồng độ axít peracetic rất dư so với Reactive Orange 122. | Động học phản ứng khử màu của Reactive Orange 122 (RO122) bằng axít Peracetic với sự có mặt của ion kim loại và ánh sáng tử ngoại VNU Journal of Science: Natural Sciences and Technology, Vol. 35, No. 3 (2019) 1-6 Original Article The Kinetic of Decolorizing Reactive Orange 122 (RO122) by Peracetic Acid in the Presence of Metal ions and UV Light Nguyen Thi Kim Giang1,3, Cao The Ha2, Vu Ngoc Duy3, 1Faculty of Chemistry, Hanoi University of Education, 136 Xuan Thuy, Hanoi, Vietnam 2Research Center for Environmental Technology and Sustainable Development, VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam 3Faculty of Chemistry, VNU University of Science, 19 Le Thanh Tong, Hanoi, Vietnam Received 09 December 2018 Revised 18 March 2019; Accepted 28 June 2019 Abstract: The kinetic of decolorizing Reactive Orange 122 (RO122) by peracetic acid (PAA) in the presence of metal ionsand UV light at 24 ± 1oChas been studied in this research. All experiments were conducted in a 500 mL reactor in which concentrations of peracetic acid were applied in large excess comparingto reactive orange 122. Four metal ions were tested for catalytic activity including Mn2+, Cu2+, Co2+, and Fe3+. The effects of metal ion concentration and pH were evaluated for the ion having the highest activity. Conbination of PAA and UV light was also this study, the variation of the dye concentration was monitored by measuring light absorption at the maximum absorption wavelength of Reactive Orange 122 (at 493 nm). The obtained results showed that Co2+ion has the highest catalytic activity. The rate of decolorization increases as the concentration of Co2+ and pH increases. Under UV light irradiation, PAA exhibited higher activity comparing to H2O2. This phenomenon can be explained by weaker O-O linkage in PAA. Keywords: peracetic acid, reactive orange 122, kinetics, UV light. __ Corresponding author. Email .