Preparation of High-Purity Mesoporous Alumina Material with Industrial Al(OH)3 via Ion Exchange

摘要

High-purity mesoporous alumina materials were prepared in this study via deep sodium removal with strong acidic cation exchange resin, a recyclable functional material that has strong dissociation ability in acid and alkaline solution for ion exchange. The effects of various conditions on the mass fraction of impurities, surface physical properties, and crystal phase of the products were investigated by XRF, XRD, SEM, EDS, TEM, BET, BJH, and NLDFT methods. When sodium aluminate solution with an initial concentration of 60 g/L was reacted by ion exchange with the resin for 60 min, the seed decomposition time was 48 h, the heating rate was 10 degrees C/min, and the holding temperature was 500 degrees C. These conditions produced mass fractions of SiO2, Fe2O3, and Na2O impurities in the alumina material of 0.0045%, 0.0038%, and 0.0166%, respectively. The total impurity removal rate was as high as 99.099%. The specific surface area, pore volume, and pore diameter were 229.4 m(2)/g, 0.28 cm(3)/g, and 4.0 nm, respectively, indicating that high-purity mesoporous alumina has high porosity and can be wielded as an adsorbent and catalyst.

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