Nghiên cứu hấp phụ anino photphat (PO43-) từ dung dịch bằng oxit hỗn hợp CeO2-Al2O3

Abstract

The nanostructure mixed oxides powder CeO₂–Al₂O₃ has been synthesized by the combustion of gel from Polyvinyl Alcohol (PVA) as polymer basic and mixture metal nitrate. The optimum conditions of synthesis method: (Ce⁴⁺+Al³⁺)/PVA molar ratio = 1/3, Ce⁴⁺/Al³⁺ molar ratio = 1/1, pH = 4, gel formation temperature at 80^oC. The phosphate ion sorption of nanostructured CeO₂-Al₂O₃ mixed oxides was presented in this paper. The results showed that the optimized conditions for obtaining the maximum adsorption capacity are: pH ~ 7-9, adsorption equilibrium time of 1h, CeO₂/Al₂O₃ molar ratio of 1/1, calcination temperature of 500 °C, the maximum adsorption capacity, Q_max of 125.42 mg/g with regression coefficient of 0.997 were found.

Keywords. CeO₂-Al₂O₃mixed oxide, phosphate anion (PO₄^3-), anionic adsorption.