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KMID : 1156220140400020137
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Journal of Environmental Health Sciences
2014 Volume.40 No. 2 p.137 ~ p.146
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Degradation of Rhodamine B in Water using Solid Polymer Electrolyte (SPE) in the Electrolysis Process
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Park Young-Seek
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Abstract
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Objectives: Feasibility of electrochemical oxidation of the aqueous non-biodegradable wastewater such as cationic dye Rhodamine B(RhB) has been investigated in an electrochemical reactor with solid polymer electrolyte(SPE).
Methods: Nafion 117 cationic exchange membrane as SPE has been used. Anode/Nafion/cathode sandwiches were constructed by sandwiching Nafion between two dimensionally stable anodes(JP202 electrode). Experiments were conducted to examine the effects of applied current(0.5~2.0 A), supporting electrolyte type (0.2 N NaCl, Na2SO4, and 1.0 g/L NaCl), initial RhB concentration(2.5~30.0 mg/L) on RhB and COD degradation and UV254 absorbance.
Results: Experimental results showed that an increase of applied current in electrolysis reaction with solid polymer electrolyte has resulted in the increase of RhB and UV254 degradation. Performance for RhB degradation by electrolyte type was best with NaCl 0.2 N followed by SPE, and Na2SO4. However, the decrease of UV254 absorbance of RhB was different from RhB degradation: SPE > NaCl 0.2 N > Na2SO4. RhB and UV254 absorbance decreased linearly with time regardless of the initial concentration. The initial RhB and COD degradation in electrolysis reaction using SPE showed a pseudo-first order kinetics and rate constants were 0.0617(R2 = 0.9843) and 0.0216(R2 = 0.9776), respectively.
Conclusions: Degradation of RhB in the electrochemical reactor with SPE can be achieved applying electrochemical oxidation. Supporting electrolyte has no positive effect on the final UV254 absorbance and COD degradation. Mineralization of COD may take a relatively longer time than that of the RhB degradation.
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KEYWORD
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COD, Dye, Electrolysis, Solid polymer electrolyte, UV254
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