Carbon and nitrogen (C–N) co-doped nano-CeO2 was synthesized by the solvothermal method using hexamethylenetetramine (HMT) as a precipitator at 140 °C for 24 h. We found that the degradation of acid orange 7 (AO7) was 94.4% and 98.8% with C–N co-doped nano-CeO2
upon irradiation with a 100-watt high-pressure mercury lamp (HML) and a 10-watt compact fluorescent lamp (CFL), respectively. By comparison, TiO2 degraded 68.4% and 43.0% of the AO7 irradiated by HML and CFL, respectively. We found that the degradation efficiencies of AO7 upon irradiation
with the 10-watt CFL in the presence of the samples synthesized using different precipitators decreased as follows: CeO2(HMT) > CeO2-TiO2(HMT) > TiO2(HMT) >> CeO2(NaHCO3) > CeO2(Na2CO3).
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