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A series of nanometer TiO2 photocatalysts co-doped respectively with rare earth Er3+-Ce3+ and La3+-Fe3+ were prepared by sol-gel method, and the photocatalytic activity under ultra-violet light was evaluated by photocatalytic degradation of methyl blue. The crystallographic forms, particles size, and morphology were characterized by XRD and TEM. The results showed that the optimum heat temperature...
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