期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 106, 期 1-3, 页码 212-218出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2007.02.052
关键词
combustion synthesis; mesoporous; nanocrystalline MgO; tube well water; defluoridation
Mesoporous MgO nanocrystals are prepared through combustion route using magnesium nitrate as oxidizer and glycine as fuel. The powder has been characterized using powder X-ray diffraction (PXRD), scanning and transmission electron microscopy (SEM/TEM), surface area and porosity measurements. The PXRD pattern confirms the crystallinity and phase purity of the powder and the particle size obtained from Scherrer's formula lies in the range 12-23 nm. The SEM result reveals that the powder is porous and agglomerated with polycrystallite nanoparticles. The pore diameter observed in TEM image is in the range 4-11 nm. The surface area of the powder is similar to 107 m(2)/g and average pore diameter obtained from desorption is 7.8 run. It is found that 0.15 g of as made MgO powder could remove 97% of fluoride from standard sodium fluoride solution (10 ppm) and 75% of fluoride from tube well water. In this technique 90% minimization of sludge could be achieved. The comparative studies on the fluoride removal capacity of as made, regenerated and commercial grade MgO powders are found to be 97%, 76% and 17%, respectively. (c) 2007 Elsevier Inc. All rights reserved.
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