Acid dye effluents are among the popular threatening sources to the environment and human health due to their photochemical stability, complexity, and poor biodegradability. Therefore, this study aims to prepare chitosan/hyperbranched polyester (HBPE)/cobalt composite with ratio (1:1:0.5 wt %, respectively) using emulsion technique as an adsorbent to deal with the acid dye effluent. Chemical structure, morphology, particle size analysis, and thermal stability of the prepared composite were carried out using Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM),) dynamic light scattering technique (DLS) and thermogravimetric analysis (TGA). Adsorption isotherms of acid blue 277 dye (AB277), using the different isotherm models (Langmuir, Freundlich, D-R, and Temkin) under removal conditions at pH 3.0 and contact time of 1 h in 10 mL aqueous medium at 25ᴼC, were investigated. The results illustrated that the chitosan/HBPE/Co composite was successfully prepared with a particle size of around 679±494 nm relative to chitosan/HBPE (139±67.6 nm). Also, the pseudo-second-order kinetic model fitted better than the pseudo-first-order one for adsorption of AB277. Batch equilibrium studies showed that chitosan/HBPE/Co composite could be employed as an efficient adsorbent of AB277 dye with an adsorption capacity of 26.74 mg/g, relative to that of chitosan/HBPE (3.19 mg/g).
Microwave-assisted synthesis of a viologen-based covalent organic polymer with redox-tunable polarity for dye adsorption