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4247370 
Journal Article 
Decolorization of direct red and direct blue dyes used in handmade paper making by ozonation treatment 
Agarwal, S; Sharma, A; Singh, K; Gupta, AB 
2016 
Yes 
Desalination and Water Treatment
ISSN: 1944-3994
EISSN: 1944-3986 
57 
8 
3757-3765 
WOS:000367886600043 
Handmade paper utilizes direct dyes for imparting it bright colors to be used in wedding cards, fancy, decorative arts, etc. The effluent of handmade paper industry faces problem of highly colored effluent. The present study aims at decolorization of direct red and direct blue dyes, used abundantly in the industry, with the help of ozonation treatment. The batch studies have been conducted on decolourization of synthetic samples of these dyes at various initial concentrations, temperature, and pH. The effect of these parameters has been studied on decolorization efficiency. The maximum decolorization is achieved at pH of 10 and temperature of 313K. The equilibrium time of decolorization with ozonation treatment for direct red and direct blue dye for 50ppm initial concentration was 6 and 4min, respectively. The kinetics of decolorization was found to be pseudo-first-order type. 
Ozonation; Decolorization; Handmade paper