The photochemical Catalytic Properties andHydrothermal Synthesis of Magnesium Borate for Efficient Removal of Congo red dye from Aqueous Solution.

Abstract

      In this study, Magnesium Borate (MB) ,was synthesized by one step precipitation from nano Magnesium oxide and Boric acid. The product was characterized by FTIR, XRD, SEM, EDX and Zeta potential. This product act as photocatalyst to remove Congo red dye (CR) from aqueous solution, all factors that effect on adsorption process studied (Time, weight of adsorbent, adsorbate concentration, pH, temperature). Model of isotherm adsorption Langmuir and Freundlich, kinetic adsorption, first order and second order pseudo and values of thermodynamic (ΔS, ΔG, ΔH) are studied. Results of study indicated that best amount of adsorbent was 0.1 g used against dye, optimal concentration of CR was 50 mg L-1, and optimum acidity function was equal to 5.5 with a volume of 100 ml. Adsorption processes were carried out using distilled water as solvent. Also, this study included calculating adsorption capacity based on optimal conditions that were obtained by applying Langmuir and Freundlich isotherm models, and qmax = (222.2) mg g-1 for (MB), kinetic adsorption following second order pseudo .Values of thermodynamic (ΔS, ΔG, ΔH) are measured and the results indicating increase in system randomness and that adsorption process is spontaneous and endothermic