Muthuraman G., Ramu A., Moon I., 2016, Semi Batch Electrolyzer for Liquid DCM Removal Using Electrochemically Generated Homogeneous Ni(I)(CN) 3-, Chemical Engineering Transactions, 54, 307-312.
Dichloromethane is a very strong persistent and its removal except on catalytic thermal combustion is tedious. Thus, the present investigation focuses on evaluation of non combustional technique like mediated electrocatalytic reduction (MER) towards dichloromethane removal using semi batch paired electrolyser. Mediator must possess high solubility in aqueous medium with low valent oxidation state stabilizing capacity. Here, Ni(II)(CN)42- solubility (0.1 M) and stability of low valent oxidation is considerably high in aqueous medium. Electrochemical reductive generation of Ni(I)(CN)43- was identified by oxidation reduction potential (ORP) change and the same was quantified by potentiometric titration and presented in the form of reduction efficiency. Finally, DCM removal was carried out by optimized conditions using semi batch electrolytic cell. The removal efficiency of DCM was calculated from the GC analysis and almost 81 % was found in 1 h duration. Cyclic voltammetry analysis of Ni(II)(CN)42- at the Cu electrode in presence of DCM revealed the MER of DCM followed by Ni(I)(CN)43-. The removal of DCM might have been followed by radical reaction pathway that facilitates the reaction at room temperature.
