Volume : IX, Issue : XI, November - 2019

Role of electrodes and electrolytes on the efficiency of electrolytic decontamination of water from Indigo Carmine dye pollutant

Veena Vijayan, Suguna Yesodharan, C. T. Aravinda Kumar, Usha K Aravind, Valsamma John Koshy, E. P. Yesodharan

Abstract :

Electrochemical Advanced Oxidation Processes (EAOP) using ‘bismuth oxide doped titanium dioxide coated on titanium plate’ (BiOx/TiO2/Ti) as the anode, stainless steel plate (SS) as cathode and NaCl solution as the electrolyte (BiOx/TiO2/Ti,NaCl,SS) is found to be an efficient method for the decolorization of Indigo Carmine (IC) dye pollutant in water. However, this process does not lead to mineralization even after continued electrolysis for 10 hr. This is due to the formation of a number of stable organochlorine intermediates, as identified by LC/MS. Another system (BiOx/TiO2/Ti, Na2SO4, graphite) can lead to complete electrolytic mineralization and elimination of COD, even though the rate of decolorization is slower compared to (BiOx/TiO2/Ti,NaCl,SS). The effect of various reaction parameters on the efficiency of decolorization/mineralization of IC is investigated and optimized. Presence of salts/anions such as carbonate, bicarbonate, nitrate, etc. enhances the decolorization. The study illustrates that an electrolytic system which is highly efficient for the degradation of a pollutant need not necessarily be good for the mineralization. This observation is important in the design of appropriate electrolytic system for the efficient purification of wastewater so that it can be repeatedly recycled.

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Article: Download PDF    DOI : 10.36106/ijar  

Cite This Article:

ROLE OF ELECTRODES AND ELECTROLYTES ON THE EFFICIENCY OF ELECTROLYTIC DECONTAMINATION OF WATER FROM INDIGO CARMINE DYE POLLUTANT, Veena Vijayan, Suguna Yesodharan, C.T. Aravinda Kumar, Usha K Aravind, Valsamma John Koshy, E.P. Yesodharan INDIAN JOURNAL OF APPLIED RESEARCH : Volume-9 | Issue-11 | November-2019


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