The Effect of 1-hydroxybenzotriazole on the Decolorization of Anthraquinone and Diazo Dyes Using Peroxidase Enzyme

Abstract

Textile dyeing wastewater involving resistant dyestuffs contaminate rivers because of their color and the production of hazardous or carcinogenic intermediates, which must be removed before being released into streams. The ligninolytic enzymes have many uses, including the elimination of dyestuffs from industrial wastewater. In this study, the Lignin Peroxidase enzyme was used to eliminate synthetic solutions of Naphthol Blue Black (NBB) and Remazol Brilliant Blue R (RBBR) dyestuffs at pH 5.0 and 30 °C. In addition, the effect of 1-hydroxybenzotriazole (HOBt), a redox mediator, on dye removal at different concentrations was investigated. Once a redox mediator was added to the LiP enzyme, the percentage of RBBR dye eliminated increased from 10% to 26% after 24 hours. On the first day after adding HOBt to the LiP enzyme, the percentage of NBB dye eliminated increased from 5% to 89%. The effect of HOBt was significantly greater in the NBB than in the RBBR. The redox mediator-added Lignin Peroxidase enzyme decolorized the NBB dye more efficiently than the RBBR dye.