Synthesis and characterization of chitosanyl-N-(Naphthalene-1-yl-amine)acetimidamide as a novel adsorbent for effective removal of bromophenol blue from the aqueous medium

In the present study, Chitosanyl-N-(Naphthalene-1-yl-amine)acetimidamide was synthesized and used for the removal of bromophenol blue dye (BPB). The modified chitosan is confirmed by different characterization tools, i.e. FTIR, SEM, CHN and XRD. FTIR spectroscopy confirmed synthesis of N-chitosanylacetamide. While morphology, nature, size of modified chitosan was verified by XRD and SEM. The effects of several operational parameters, including pH (3-9), adsorbent dosage (0.06-0.16), time (30-135), and initial dye concentration (20-90ppm), were investigated. Optimal conditions for BPB adsorption were determined as 90 minutes contact time, pH 4, 80 ppm concentration, and 0.1 g adsorbent dosage. The adsorption process was evaluated using kinetic models and isotherms, showing that BPB adsorption follow a pseudo-second-order kinetic model. The Langmuir isotherm provided the best fit for the experimental data. Synthesized material showed profound stability after consecutive adsorption desorption cycle of reuse and achieving 92% dye removal at each stage. This result suggested that prepared biosorbent have potential applications in the treatment of effluents from textile industries.