Abstract
Al-doped ZnO nanoparticles were synthesized through a solution combustion synthesis derived from zinc nitrate, aluminum nitrate and urea mixed solution. The effects of fuel/oxidizer molar ratio (ϕ) on the morphology, physical properties, and adsorptive properties for organic pollutants of Al-doped ZnO have been systematically investigated. The results indicated that the homogeneous Al-doped ZnO powders might be prepared by selecting an optimum ϕ in solution. The results of XRD pointed toward a significant pure wurtzite ZnO phase for 2mol% Al-doped ZnO powders prepared with different ϕ. With the increase of ϕ, the morphology of the products changes from clusters of irregular particles into flakes. A well-distributed and smaller crystallite size varying from 30nm to 50nm was observed from 2mol% Al-doped ZnO sample (ϕ=4). In addition, the Al-doped ZnO sample (ϕ=4) showed a higher absorption ability and shorter equilibration time for organic pollutants compared to other samples.
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