DEGRADATION OF METHYLENE BLUE USING MEDIATED ELECTROCHEMICAL OXIDATION METHODE WITH Ce(IV) AS MEDIATOR AND Ag (I) AS CATALYST

• Main Author: MUSTIKA SARI NIM: 20516032, FENI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/27284
• Institution: Institut Teknologi Bandung

Mediated Electrochemical Oxidation (MEO) is one of electrochemical methode are widely used to degrade organic pollutans from waters. Methylene blue is one of the organic chemical that are widely used in the textile industry. Methylene blue waste accumulated in the waters around the industry. Therefore an effective method is needed to degrade the waste so it is safer for humans and the environment. The purpose of this research is to know the effect of addition of mediator Ce (IV) and catalyst Ag (I) for electrochemical degradation process of methylene blue. Dyes represent one of problematic group. We have studied the degradation of methylene blue (MB) using MEO methode with batch system with Ce (IV) as mediator and Ag (I) as catalyst. Ce (IV) as mediator was made electrochemically from the oxidation of Ce (III). Ce (IV) can degrade textile dye waste by oxidizing them into simpler products so that the danger level is reduced. The voltammetric study was performed by cyclic voltammetry technique with a carbon paste electrode as the working electrode, Ag / AgCl as the reference electrode and Pt wire as the auxiliary electrode. The result shows that the oxidation potential of Ce (III) / Ce (IV) and MB respectively are 1.25 volt and the 0.27 volt. MB degradation study was performed in an electrochemical cell with platinum wire as anode and cathode. Maximum degradation percentage is achieved at 89,04%, in electrodegradation of 250 mg L-1 MB in H2SO4 0.3 mol L-1 with addition of 0.02 mol L-1 Ce(III) for 30 minutes using potential of 7.5 volt. The catalytic effects of the Ag (I) on MB oxidation by Ce (IV) as well as the anodic generation of Ce (IV) were investigated. The addition 2 mmol L-1 of Ag (I) has increased the percent degradation up to 100%. From the test results using HPLC and UV-Vis decrease after degradation, it shows that MB has been degraded into other components. The percentage of CO2 levels produced during normal degradation process using acid-base titration method is 52,88%. The MB degradation process in H2SO4 0.3 mol L-1 with Ce (III) 0,02 mol L-1 and Ag (I) 2 mmol L-1 have resulted in simpler products such as CO2. <br /> <br />