Adsorption of Acid and Basic Dyes on NiO–SiO2 Compositesстатья
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Дата последнего поиска статьи во внешних источниках: 4 февраля 2014 г.
Аннотация:A series of composites containing 2.5–21.0% NiO on a surface of macroporous silica is synthe
sized. The specific surface area of the composites measured by the thermal desorption of nitrogen decreases
with an increase in the NiO content from 24 for the original siliceous carrier to 16 m2/g the for composite
containing 21.0% NiO. The basic dye, methylene blue (MB), is only adsorbed on SiO2 in water solutions,
while acid blue anthraquinone (ABA) is only adsorbed on the NiO. The effective specific surface area Seff and
effective diameters Deff of NiO nanoparticles are calculated from the adsorption isotherms of ABA on NiO
composites and on NiO synthesized without a carrier. Seff of NiO nanoparticles decreases from 76 to 42 m2/g
and Deff increases from 8 to 14 nm with rising NiO content in the composites. The NiO nanoparticles synthe
sized without a carrier are characterized by the lowest Seff (30 m2/g) and the largest Deff (20 nm).