Evaluation of ZnO, TiO2 and supported ZnO on the photoassisted remediation of black liquor, cellulose and textile mill effluents

The use of titanium dioxide and zinc oxide as semiconductor metallic oxides in the photocatalytic treatment of effluents derived from the Kraft wood pulping process was already documented. The application of these compounds to the remediation of effluent derived from textile and pulp and paper mills...

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Bibliographic Details
Published in:Chemosphere (Oxford) 1998-04, Vol.36 (9), p.2119-2133
Main Authors: Peralta-Zamora, P, Gomes de Moraes, S, Pelegrini, R, Freire, M. Jr, Reyes, J, Mansilla, H, Duran, N
Format: Article
Language:English
Subjects:
Applied sciences
color
Exact sciences and technology
industrial effluents
Industrial wastewaters
oxidation
phenols
photolysis
Pollution
pulp and paper mill effluents
removal
sulfate liquor
textile industry
titanium dioxide
ultraviolet radiation
wastewater treatment
Wastewaters
Water treatment and pollution
zinc oxide
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Summary:The use of titanium dioxide and zinc oxide as semiconductor metallic oxides in the photocatalytic treatment of effluents derived from the Kraft wood pulping process was already documented. The application of these compounds to the remediation of effluent derived from textile and pulp and paper mills was evaluated. Data showed that when Kraft and textile effluents were submitted to ultra-violet (UV) radiation in the presence of free titanium dioxide zinc oxide or zinc oxide supported on silica gel the colour faded progressively so that a substantial decolorization was achieved. Accompanying this process was a reduction in the concentration of total phenols in the black liquor and final effluents. Conversely an increase in phenol concentration accompanied the early stages of photocatalysis of the textile effluent. Degradation of chemical species present in the effluent was demonstrated by HPLC analysis and mineralization up to 50 per cent was confirmed by determination of total organic carbon. The toxicity of all effluents was reduced by about 50 per cent. Decolorization was not observed in the absence of photocatalysts. There are 35 references.
ISSN:0045-6535
1879-1298
DOI:10.1016/S0045-6535(97)10074-1