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Surface Characterization of Amorphous Aluminum Oxides

^a USDA-ARS, U.S. Salinity Lab., 450 W. Big Springs Rd., Riverside, CA 92507
^b Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521

View larger version (19K): [in a new window]   Fig. 1. Brunauer–Emmett–Teller N2 adsorption–desorption isotherms for the initial Al oxide precipitates

View larger version (23K): [in a new window]   Fig. 2. Distribution of pore diameters obtained with mercury intrusion porosimetry for four amorphous Al oxides of different initial surface areas

View larger version (19K): [in a new window]   Fig. 3. Pore-size distribution obtained with nuclear magnetic resonance spectroscopy for two amorphous Al oxides of differing initial surface area

View larger version (83K): [in a new window]   Fig. 4. Transmission electron micrographs showing Al oxide morphology. (a) Initial surface area: 12 m2 g-1, magnification: 14500x; (b) initial surface area: 76 m2 g-1, magnification: 11000x

View larger version (34K): [in a new window]   Fig. 5. Distribution of particle diameters obtained from scanning electron microscope measurements for four Al oxides of different initial surface areas

View larger version (14K): [in a new window]   Fig. 6. Surface area as a function of temperature for two amorphous Al oxides of differing initial surface areas

View larger version (148K): [in a new window]   Fig. 7. Scanning electron micrographs showing Al oxide morphology (a, b) before and (c, d) after suspension in water for 9 d: (a, c) lowest initial surface area; (b, d) highest initial surface area

View larger version (20K): [in a new window]   Fig. 8. Boron adsorption as a function of solution pH for four amorphous Al oxides of differing initial surface areas expressed on a: (a) per gram basis, (b) per meter squared of initial surface area basis, (c) per meter squared of final surface area basis

View larger version (20K): [in a new window]   Fig. 9. Arsenite adsorption as a function of solution pH for four amorphous Al oxides of differing initial surface areas expressed on a: (a) per gram basis, (b) per meter squared of initial surface area basis, (c) per meter squared of final surface area basis

View larger version (16K): [in a new window]   Fig. 10. Arsenate adsorption as a function of solution pH for four amorphous Al oxides of differing initial surface areas expressed on a per meter squared of final surface area basis

View larger version (14K): [in a new window]   Fig. 11. Molybdate adsorption as a function of solution pH for four amorphous Al oxides of differing initial surface areas expressed on a per meter squared of final surface area basis

View larger version (14K): [in a new window]   Fig. 12. Arsenate adsorption as a function of solution pH and method of drying for two amorphous Al oxides of differing initial surface areas