Abstract:

Using triethylamine as a template and acetic acid as a complexing agent for ferric iron, three analcimes with different iron concentrations were synthesized by a hydrothermal synthesis method according to the following procedure: a mixture with mole ratios of n(SiO2):n(Al2O3):n(Na2O):n(Fe3+):n(H2O)=2.3:1:3.9:(0.02, 0.04, 0.08):185 was prepared and stirred for 5 h at roomtemperature and then crystallized for 60 h at 170 ℃ in a stainless steel reaction pot. To address the problem of powdered zeolite separation from the disposed solution, a series of magnetic zeolites were synthesized by deoxidizing the iron-doped analcimes at 700 ℃. The crystalline structure was characterized by X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, and scanning electron microscope (SEM). Results suggested that iron-doped analcimes had an equivalent structure to pure analcime but that the structure of magnetic zeolites was different. Their adsorption to fluorinion and lead ions in water was studied and it was found that iron-doped analcimes and magnetic analcimes showed no promoting effect on adsorption of these ions.

Key words: Analcime, Doping, Magnetic, Hydrothermal synthesis method, Adsorption