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Due to the doping of aluminum ions, particle size of ZnO was significantly minimized, which resulted in two promotive effect to its photocatalytic reaction. On one hand, a wider energy gap with lower potential on conduction band and higher potential on valence band was gained due to smaller partical size, redox ability enhanced and photocatalytic activity increased.
On the other hand, the surface area is increased, which would promote the photocatalytic reaction proceeds because of the enhanced adsorption substrates ability.
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