고체 고분자 전해질(SPE)을 이용한 전기분해 공정에서 Rhodamine B 분해
Degradation of Rhodamine B in Water using Solid Polymer Electrolyte(SPE) in the Electrolysis Process
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Objectives: Feasibility of electrochemical oxidation of the aqueous non-biodegradable wastewater such ascationic dye Rhodamine B (RhB) has been investigated in an electrochemical reactor with solid polymerelectrolyte (SPE). Methods: Nafion 117 cationic exchange membrane as SPE has been used. Anode/Nafion/cathode sandwicheswere 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 CODdegradation and UV254 absorbance. Results: Experimental results showed that an increase of applied current in electrolysis reaction with solidpolymer electrolyte has resulted in the increase of RhB and UV254 degradation. Performance for RhB degradationby electrolyte type was best with NaCl 0.2 N followed by SPE, and Na2SO4. However, the decrease of UV254absorbance of RhB was different from RhB degradation: SPE > NaCl 0.2 N > Na2SO4. RhB and UV254absorbance decreased linearly with time regardless of the initial concentration. The initial RhB and CODdegradation in electrolysis reaction using SPE showed a pseudo-first order kinetics and rate constants were0.0617 (R2 = 0.9843) and 0.0216 (R2 = 0.9776), respectively. Conclusions: Degradation of RhB in the electrochemical reactor with SPE can be achieved applyingelectrochemical oxidation. Supporting electrolyte has no positive effect on the final UV254 absorbance and CODdegradation. Mineralization of COD may take a relatively longer time than that of the RhB degradation.
Abstract
Objectives: Feasibility of electrochemical oxidation of the aqueous non-biodegradable wastewater such ascationic dye Rhodamine B (RhB) has been investigated in an electrochemical reactor with solid polymerelectrolyte (SPE). Methods: Nafion 117 cationic exchange membrane as SPE has been used. Anode/Nafion/cathode sandwicheswere 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 CODdegradation and UV254 absorbance. Results: Experimental results showed that an increase of applied current in electrolysis reaction with solidpolymer electrolyte has resulted in the increase of RhB and UV254 degradation. Performance for RhB degradationby electrolyte type was best with NaCl 0.2 N followed by SPE, and Na2SO4. However, the decrease of UV254absorbance of RhB was different from RhB degradation: SPE > NaCl 0.2 N > Na2SO4. RhB and UV254absorbance decreased linearly with time regardless of the initial concentration. The initial RhB and CODdegradation in electrolysis reaction using SPE showed a pseudo-first order kinetics and rate constants were0.0617 (R2 = 0.9843) and 0.0216 (R2 = 0.9776), respectively. Conclusions: Degradation of RhB in the electrochemical reactor with SPE can be achieved applyingelectrochemical oxidation. Supporting electrolyte has no positive effect on the final UV254 absorbance and CODdegradation. Mineralization of COD may take a relatively longer time than that of the RhB degradation.
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