Green is attractive and beautiful. Green chemistry has attracted scientists and researchers from various fields. Electrolysis is considered as green electrochemistry, because electrochemical process can be stopped and controlled at any time and at any stage of the reaction. Usually water is used as the solvent. Corrosive acids are not used. Toxic chemicals are not involved. The main components of an electrolysis process are anode, cathode and electrolyte. By using suitable anodes, cathodes and medium, electrolysis has been applied in various fields. Electrolysis has been used to decolourise dyes from effluents of textile industries. The decolourisation efficiencies of various anodes, such as platinised-titanium, mild steel and aluminium in various electrolytic media, such as well water and sea water, have been evaluated and compared. The role of positive chlorine in the decolourisation process has been established. Electrolysis, in presence of a suitable reducing agent, has also been used to synthesize nanoparticles. Copper nanoparticles and silver nanoparticles have been produced by making use of reducing agents, such as sodium potassium tartrate and trisodium citrate. Various plants extracts have also been used as reducing agents. The nanoparticles synthesized by green methods have been characterized by UV-Visible absorption spectroscopy and fluorescence spectroscopy. The surface morphology of these nanoparticles has been characterized by SEM and EDS. Blue pigment that can be used in paint industry has been synthesized by green electrolysis. For this purpose, waste mild steel rod has been used, and graphite has been used as anode. The blue pigment prepared has been characterized by UV-Visible absorption spectroscopy and fluorescence spectroscopy. The surface morphology of these nanoparticles has been characterized by SEM and EDS. The blue pigment prepared is found to be in the nano range. This can be used in paint industry and also in the field of nano biosensors. By green electrolysis method, Hofmann rearrangement has been successfully effected, benzamide being the starting material. The product obtained has been diazotised and coupled with α-napthol and β-napthol to give dyes. The dyes have been characterized by UV-Visible absorption spectroscopy and fluorescence spectroscopy. Polyaniline has also been synthesized by green electrolysis process, without using expensive oxidizing agents, but using positive chloride ions generated in-situ during electrolysis, in the presence of sodium chloride solution as electrolyte. The polyaniline produced has been characterized by UV-Visible absorption spectroscopy, fluorescence spectroscopy and FTIR spectra.

Titanium dioxide nanoparticles have been used to control corrosion of mild steel in well water in the absence and presence of an aqueous May flower extract. As the concentration of TiO 2 increases, the inhibition efficiency also increases. 100 ppm of TiO 2 offers 84 % inhibition efficiency. The addition of 10mlof May flower extract enhances the inhibition efficiency to 95 %. Adsorption of TiO 2 on the metal surface follows Langmuir adsorption isotherm. Polarization study reveals that the flower extract-TiO 2 system functions as mixed type of inhibitor, controlling both anodic and cathodic reactions. AC impedance spectra reveal the formation of a protective film on the metal surface. This technology may find application in cooling water systems and concrete technology.

Corrosion resistance of orthodontic wire made of SS 316L alloy in artificial saliva in the absence and presence of five tablets namely, Limcee-500mg, Shelcal-500mg, Ferikind, Cefixime-200mg, Biogenetic (Aluminium Hydroxide And Magnesium Trisilicate), has been evaluated by polarisation study and AC impedence spectra. It is observed that in the presence of the tablets Ferikind and Biogenetic (Aluminium Hydroxide and Magnesium Trisilicate) the corrosion resistance of SS 316L alloy increases. On the other hand in the presence of the tablets Limcee-500mg, Shelcal-500mg and Cefixime-200mg the corrosion resistance of SS 316L alloy decreases. Hence it is recommended that people implanted with orthodontic wires made of SS 316L alloy need not hesitate to take the tablets Ferikind and Biogenetic (Aluminium Hydroxide and Magnesium Trisilicate) orally. People having implanted with orthodontic wire made of SS 316L should avoid taking tablets Limcee-500mg, Shelcal-500mg and Cefixime-200mg. The increase in corrosion resistance or decrease in corrosion resistance of SS 316L alloy in the presence of these tablets in artificial saliva is due to the ingredients present in tablets.

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