Natural mordenite derived zeolites: Synthesis, formation, and their evaluation in Cr(III) removal from tannery wastewater
The synthesis of zeolites from natural mordenite, their subsequent forming process, and their evaluation in a Cr(III) removal process from tannery wastewater is presented. Mordenite is an abundant naturally occurring zeolite with relatively low cation exchange properties. Zeolite synthesis from mordenite was carried out in a larger reactor than commonly employed autoclaves. Synthesized products were identified by X-ray diffraction (XRD), and zeolite extrudates were characterized by their chromium exchange capacity (CrEC), mechanical, and textural properties, which were optimized as a function of binder composition. A FAU zeolite-rich product was obtained under controlled synthesis conditions. FAU-type zeolite is a nanoporous material (pore opening of âˆ¼0.74 nm), which presents high cation exchange capacity. The use of silicate-urea-based binders enabled the production of FAU-type zeolite extrudates with CrEC (0.64 mEqÂ·g -1) and compressive strength (143 kgÂ·m -2) appropriate for their use in Cr(III) removal processes from aqueous solution; these values were as high as those found for commercial zeolite extrudates (0.65 mEqÂ·g -1 and 66 kgÂ·m -2, respectively). Columns packed with the prepared zeolite extrudates, exhibited high performance for Cr(III) removal from synthetic and diluted tannery wastewater (pH 3.5). Thus, FAU-type zeolite extrudates obtained from natural mordenite appear as promising ion exchangers for tannery wastewater treatment and as a feasible alternative to the commercial ion exchangers. Â© Mary Ann Liebert, Inc. 2007.
|Título según WOS:||Natural mordenite derived zeolites: Synthesis, formation, and their evaluation in Cr(III) removal from tannery wastewater|
|Título según SCOPUS:||Natural mordenite derived zeolites: Synthesis, formation, and their evaluation in Cr(III) removal from tannery wastewater|
|Título de la Revista:||Environmental Engineering Science|
|Editorial:||Mary Ann Liebert|
|Fecha de publicación:||2007|
|Página de inicio:||1443|