Oxidative degradation of dyes in water using Co2+/H2O2 and Co2+/peroxymonosulfate.
Dye degradation using advanced oxidation processes with Co(2+)/H(2)O(2) and Co(2+)/peroxymonosulfate (PMS) systems has been investigated. Two types of dyes, basic blue 9 and acid red 183, were employed. Several parameters affecting dye degradation such as Co(2+), PMS, H(2)O(2), and dye concentrations were investigated. The optimal ratio of oxidant (PMS, H(2)O(2))/Co(2+) for the degradation of two dyes was determined. It is found that dye decomposition is much faster in Co(2+)/PMS system than in Co(2+)/H(2)O(2). For Co(2+)/H(2)O(2), an optimal ratio of H(2)O(2) to Co(2+) at 6 is required for the maximum decomposition of the dyes. For Co(2+)/PMS, higher concentrations of Co(2+) and PMS will increase dye degradation rate with an optimal ratio of 3, achieving 95% decolourisation. For basic blue 9, a complete decolourisation can be achieved in 5 min at 0.13 mM Co(2+), 0.40 mM PMS and 7 mg/l basic blue 9 while the complete degradation of acid red 183 will be achieved at 30 min at 0.13 mM Co(2+), 0.40 mM PMS and 160 mg/l of acid red 183. The degradation of acid red 183 follows the second-order kinetics.
Ling
Sie King
SK
Department of Chemical Engineering, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia.
Wang
Shaobin
S
Peng
Yuelian
Y
D003035:Cobalt / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007220:Industrial Waste / Q000032:analysis*; D007700:Kinetics; D008751:Methylene Blue; D010084:Oxidation-Reduction; D010545:Peroxides / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry; D013843:Thiazines; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water / Q000737:chemistry
D004396:Coloring Agents; D007202:Indicators and Reagents; D007220:Industrial Waste; D010545:Peroxides; D013464:Sulfuric Acids; D013843:Thiazines; D014867:Water; C038288:peroxymonosulfate; D003035:Cobalt; D006861:Hydrogen Peroxide; C048813:potassium peroxymonosulfuric acid; D008751:Methylene Blue