NGHIÊN CỨU TỔNG HỢP VÀ KHẢO SÁT CÁC YẾU TỐ ẢNH HƯỞNG TỚI KHẢ NĂNG HẤP PHỤ PHOSPHAT CỦA VẬT LIỆU HYDROXIT LỚP KÉP Zn-Al

STUDY ON SYNTHESIS AND DETERMINATION OF FACTORS AFFECTING PHOSPHATE ADSORPTION ON Zn-Al LAYERED DOUBLE HYDROXIDE MATERIALIn this paper, a layered double hydroxide (LDH) materials with a Zn/Al molar ratio of 2:1 were synthesized successfully by co-precipitation method. Materials were chacracterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy/energy dispersive X-ray spectroscopy (FESEM/EDX). The effects of different calcined temperatures, initial phosphate concentrations, contact time, pH values and co-existing on phosphate adsorption were investigated from batch tests. Our results indicate that adsorption capacity of Zn-Al LDH is the best at calcinned temperature of 200oC, the equilibrium time attained within 240 min and the optimal pH was approximately 4. The effect of common coexisting ions including chloride, carbonate, nitrate and sulphate on the simultaneous adsorption of phosphate was in the order of Cl‒ < NO3‒ < SO42‒ < CO32‒.