Decoloration of azo dye methyl orange by a novel electro-Fenton internal circulation batch reactor
-
Chunwei Yang
,
Dong Wang
Abstract
A novel internal circulation batch reactor (ICBR) was utilized to treat an azo dye pollutant methyl orange (MO) solution by the Electro-Fenton process, with graphite rods as the anodes and metal processing waste iron shavings as the cathodes. The MO decoloration efficiency reached 98.6 % for 0.08 g L–1 MO after an 18-min reaction under the optimal conditions of a pH=3.00, current density=0.90 mA/cm2 and Na2SO4 concentration=7.00 g L–1. A kinetic fitting analysis shows that the MO decoloration rule complies with the first-order kinetics model, and the rate constant reaches 0.329 min–1 under optimal conditions. The durability of the iron-shavings cathode was tested by decoloration of 5 batches of MO using the same cathode without allowing the regeneration process to proceed. MO decoloration efficiencies also reached as high as 95 % in the fifth batch 34 min into the reaction, even though the first-order rate constants decreased to 0.064 min–1. The iron-shavings cathode could also be reused by washing with 5 % (w/w) dilute sulfuric acid. Compared to the conventional square-shaped electrolytic batch reactor (SEBR), ICBR has the remarkable advantages of MO decoloration efficiency and energy conservation.
Funding statement: The study was supported by the Science Foundation of Jilin Province (20140101215JC), the Key Program in Science and Technologies of Jilin Province (20150204049SF) and the Key Laboratory of Industrial Ecology and Environmental Engineering, China Ministry of Education (KLIEEE-13-07).
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- Editorial: The importance of advanced oxidation processes in degrading persistent pollutants
- An overview on heterogeneous Fenton and photoFenton reactions using zerovalent iron materials
- Photooxidative Degradation of Pesticides in Water; Response Surface Modeling Approach
- The treatment of aniline in aqueous solutions by gamma irradiation
- Microwave regeneration of biological activated carbon
- Molecular iodine/aqueous NH4OAc: a green reaction system for direct oxidative synthesis of nitriles from amines
- Catalytic Degradation of Safranin T in Aqueous Medium Using Non-conventional Processes
- Oxidation of 1, 2-dichlorobenzene on a commercial V2O5-WO3/nano-TiO2 catalyst: Effect of HCl addition
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- Kinetics analysis of photocatalytic degradation of Acid Orange 7 by Co/N/Er3+: Y3Al5O12/TiO2 films
- Reaction characteristics of oxygen generation from plate-like potassium superoxide within a confined space
- Electrochemical reduction of CO2 on a Cu2O/polyaniline /stainless steel based electrode
- Role of oxygen-containing functional surface groups of activated carbons on the elimination of 2-hydroxybenzothiazole from waters in A hybrid heterogeneous ozonation system
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- Selective Fenton-like catalytic oxidation of acid orange II on inorganic heterogeneous molecular imprinted catalysts
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