Preparation, characterization and adsorption properties of sodalite pellets

• Raw materials: low-cost coal fly ash is reused, and no residual is left.
• Processes: they avoid unnecessary energy consumption and the addition of chemical.
• Products: they are granular, porous, and single phase.
• Performances: the products exhibit good adsorption performances.

This paper explores the capability of the combined processes of extrusion molding and hydrothermal synthesis for the creation of porous granular single-phase zeolitic products which were prepared from coal fly ash. The key is to introduce the plasticizer of sodium carboxymethyl cellulose (CMC) in order to tailor the relative plasticity of the paste. Furthermore, CMC also acts as a kind of pore-forming agent. The crystalline phase, purity and morphologies of the semi-finished products and the products were characterized by XRD and SEM. Effects of material ration, concentration, crystallinity temperature and time were explored and optimal conditions were shown. The adsorption properties of the as-prepared sodalite pellets were evaluated by the removal of Pb2+. In comparison with commercial activated carbon particles, the as-prepared sodalite pellets exhibit good adsorption performances.

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