-Fe₂O₃ powder has been  synthesized at low temperature (250⁰C) by the combustion of gel prepared from  polyvinyl alcohol (PVA) and iron nitrates.

Factors affecting on structure and particle size of nanometer γ-Fe₂O₃ oxides including temperature of calcining was investigated.

The crystalline process and the morphology of  oxide particles were considered by X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Vibrating Sample Magnetometer (VSM). Surface  areas of oxides were determined by the BET ( Brunaure-Emmet-Teller) method. Further thermal treatment at 250-300⁰C in 3h yields the single phase -Fe₂O₃ with the surface area  39,5   m²/g. The results indicated that -Fe₂O₃ powders with crystallite size 15-20 nm, Hc = 1,8 Oe, Ms =  29 emu/g, M_r =  0,4 emu/g have been prepared.

The adsorption treatment of iron, manganes and arsenic were investigated. The nanosized - Fe₂O₃ material yielded maximum sorption capacity of   48,02 mg/g for arsenic, 57,09 mg/g for arsenat;    138,89 mg/g for manganese and 150,07 mg/g for iron according to the Langmuir isotherm.

Tải file Tổng hợp γ-Fe2O3 kích thước nanomet bằng phương pháp đốt cháy gel và nghiên cứu khả năng hấp phụ sắt, mangan, asen tại đây