CHẾ TẠO VẬT LIỆU NANO γ-Fe2O3/CÁT THẠCH ANH HẤP PHỤ ASEN, SẮT VÀ MANGAN

Abstract

The nanosized γ-Fe₂O_{3 ­}coated sand was synthesized and used in the arsenic, manganese and iron adsorption. Gel was prepared from polyvinyl alcohol (PVA) and iron nitrate at temperature of solution 80^oC with molar ratio PVA/metal = 3/1. Then soaking the gel with sand of size from 0.5 to 1.0 mm, drying and calcinating at 250^oC for 2 hours  to obtain the nanosized g-Fe₂O_{3 ­}coated sand. The nanosized γ-Fe₂O₃ coated sand ­material of size from 0.5 to 1.0 mm yielded maximum sorption capacity of 1.71 mg/g for As(III);  1.89 mg/g for As(V), 2,93 mg/g for manganese and  4.00 mg/g for iron according to the Langmuir isotherm.