Abstract
Sodalite crystals were prepared with varying hydrogel Al2O3/SiO2 molar ratio at room temperature via hydrothermal method. The particulate properties of products prepared under room temperature and elevated temperature condition were compared. The results displayed that spherical particles built of small crystallites were obtained after 10 h of room-temperature hydrothermal treatment; while with the same gel composition, the sodalite obtained for 10 h at 90 o C was large lepispherical particles. Moreover, the samples prepared at room temperature exhibited much higher Cd2+ sorption capacities, and the maximum adsorption capacities of Cd2+ were tested to be 84.2, 88.6, 92.9, and 98.2 mg/g for the sodalite synthesized with hydrogel Al2O3/SiO2 molar ratios of 0.43, 0.55, 0.68 and 0.84, respectively. The reasons can be due to its specific porous structure, large surface area, and more adsorption active sites. Additionally, the kinetics and isotherm analysis revealed that pseudo-second order model and Langmuir model agreed well with the adsorption processes. This work offered an economic synthesis method of sodalite to achieve efficient Cd2+ removal from aqueous solution.
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