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Decolourisation of dyes and dyehouse effluent in a bubble‐column reactor by heterogeneous catalytic ozonation
Author(s) -
Hassan M Mahbubul,
Hawkyard Christopher J
Publication year - 2006
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1384
Subject(s) - catalysis , effluent , chemistry , activated carbon , aqueous solution , ferric , bubble column reactor , oxide , kinetics , heterogeneous catalysis , inorganic chemistry , dyeing , chemical engineering , bubble , organic chemistry , waste management , adsorption , physics , quantum mechanics , parallel computing , gas bubble , computer science , engineering
The decolourisation of aqueous solutions of dyes by ozonation with various heterogeneous catalysts using a bubble‐column reactor was investigated. The catalysts studied were hydrated alumina, activated carbon and ferric oxide supported on silica. The optimum catalyst concentration and pH for decolourisation were determined in each case. Hydrated alumina and silica‐supported ferric oxide showed excellent catalytic activity under acidic conditions, whereas activated carbon was found to be effective under both acidic and alkaline conditions. In addition to studying the effect on individual dyes, tests were carried out on effluent from a commercial dyeing unit. The reaction kinetics in the presence of various catalysts were also monitored. Copyright © 2005 Society of Chemical Industry