Removal of tannins and polyhydroxy phenols by electro-chemical techniques

Murugananthan, M and Bhaskar Raju, G and Prabhakar, S (2005) Removal of tannins and polyhydroxy phenols by electro-chemical techniques. JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY , 80 (10). pp. 1188-1197.

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The removal of tannins and their basic molecules such as catechol, pyrogallol, phloroglucinol and resorcinol was studied by electro-flotation and electro-oxidation techniques. Iron rods and triple oxide (TaO2/RuO2/IrO2) coated titanium rods were used as electrodes for electro-flotation and electrooxidation respectively. Interaction of tannins and polyhydroxy phenols; with iron oxy-hydroxide formed by anodic dissolution of iron was studied by UV-Visible, FT-IR and zeta-potential measurements. GC-MS was used to identify the intermediate compounds formed during electro-oxidation. Catechol, pyrogallol, phloroglucinol and resorcinol were found to be mineralized in the presence of triple oxide (TaO2/RuO2/IrO2) coated titanium electrodes. Catechol and pyrogallol were found to form insoluble organo-metal complexes while resorcinol and phloroglucinol were found to adsorb on iron oxy-hydroxide. The sludge thus formed was simultaneously separated from the aqueous phase by hydrogen bubbles. It was observed that the power consumption is relatively high for electro-oxidation compared with electroflotation. The effects of pH and reaction time on their removal were also studied and the results are discussed. (c) 2005 Society of Chemical Industry.

Item Type:Article
Official URL/DOI:DOI: 10.1002/jctb.1314
Uncontrolled Keywords:electro-oxidation; electro-flotation; tannins; catechol; pyrogallol; phloroglucinol; resorcinol
Divisions:NML Chennai
ID Code:3334
Deposited By:Sahu A K
Deposited On:14 Jul 2011 17:17
Last Modified:12 Mar 2013 12:42
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