Synthesis and characterization of nano-zinc oxide fiber: adsorption of acid blue 92 dye, isotherms, thermodynamics and kinetics

Abstract Rapid industrialization, particularly textile/dyeing, causes substantial surface water contamination by various dyes and pigments globally. Bangladesh’s export-oriented textile industry has grown dramatically in recent decades, causing significant pollution of nearby water bodies. In this work, nano-zinc oxide was synthesized by a precipitation method with PEG 400 and characterized using SEM, XRD and FTIR techniques and found to be fiber-like, perfectly wurtzite and pure. The nano-ZnO was applied to remove acid blue 92, an ionic dye, from aqueous solution to investigate it as an adsorbent. The effects of pH, adsorbent dosage, AB92 concentration and contact time on adsorption process were investigated for optimization. According to the correlation coefficients ( R 2 ) and the fitting of Redlich-Peterson model, the adsorption…