Decolorization of reactive dyes, Part I: eco-friendly approach of reactive dye effluents decolorization using cationized sugarcane bagasse

Purpose - This paper aims to decolorize the effluents of textile Reactive Orange 5 and Reactive Red 195 dyes by using cationized sugarcane bagasse. Design/methodology/approach - Cationized sugarcane bagasse was prepared and used as an adsorbent for both reactive and hydrolyzed reactive dyes. Characterization of the sugarcane bagasse structure resulted by cationization was monitored using Fourier transform-infrared, while morphologically was detected using scanning electron microscopy and X-ray powder diffraction. Findings - The maximum adsorption capacities are 805, 1,664, 1,772 and 1,596 mg/g for Hydrolyzed Red 195, Hydrolyzed Orange 5, Reactive Red 195 and Reactive Orange 5 dyes, respectively. Research limitations/implications - Factors affecting the percentage of dye removal were optimized on different parameters such as adsorbent dose and treatment time. The data were discussed using the Langmuir and Freundlich Models of adsorption. Practical implications - The reuse of hydrolyzed reactive dyebaths gives reasonably good fastness properties on nylon fabrics. Social implications - The study has enabled the production of an eco-friendly and less expensive method of reactive dye effluent decolorization. Originality/value - The study provides a potentially simple approach to decolorize dye effluents of Reactive Orange 5, Red 195 dyes and also the reuse of hydrolyzed reactive dyebaths for dyeing nylon.