Preparation of Semi IPNs-Hydrogel Composite for Removing Congo Red and Bismarck Brown Y from Wastewater: Kinetic and Thermodynamic Study

Modified acrylamide-based semi-interpenetrating polymer network (semi-IPN) hydrogel composites were prepared for Congo red (CR) and Bismarck brown Y (BBY) dyes adsorption from aqueous solutions. Adsorption for both dyes was studied in batch mode and results show adsorption highly dependent on concentration, solution pH, and contact time. The prepared hydrogels exhibited a high adsorption capability. Also, the kinetic studies indicated that the adsorption of dyes followed the pseudo-second-order model and was found to match well with the Langmuir isotherm model. Thermodynamic studies showed that the adsorption process was spontaneous and endothermic. The prepared hydrogel composites also exhibit good regeneration efficiency for the four successive adsorption-desorption cycles. Based on these analyses, it can be concluded that these adsorbents be acted as an efficient option for the removal of contaminant dyes from aqueous solutions.