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To investigate the application of nano-CeO2-TiO2 as a sorbent in wastewater treatment, CeO2-TiO2 powder was prepared by the solvothermal method and then characterized. The adsorption kinetics of the adsorption of acid orange 7 (AO7) on CeO2-TiO2 were investigated under various conditions, such as initial concentration, temperature, and pH of the AO7 solution. Kinetic analyses were conducted with both Lagergren pseudo-first and pseudo-second order models. The results showed that the CeO2-TiO2 powder was composed of cubic CeO2 and anatase TiO2 with a specific surface area of 140.42 m2 x g(-1). The adsorption capacity of AO7 on CeO2-TiO2 increased with increasing starting concentration of AO7, but decreased with increasing temperature. The most favorable pH range of the A07 solution was 3-8 for the adsorption of AO7 on CeO2-TiO2. The results revealed that the adsorption kinetics of AO7 on CeO2-TiO2 matched the pseudo-second order model very well. The results indicate that CeO2-TiO2 has a potential application in the removal of AO7 from wastewater.

In this study, CeO 2 and a mixture of TiO 2 and CeO 2 (CeO 2 -TiO 2 , Ce : Ti (mol.) = 3 : 1) were synthesized by the solvothermal method at different temperatures. The particle size, either CeO 2 or CeO 2 -TiO 2 synthesized at 140 ºC was less than 10 nm. Nitrogen and carbon co-doped CeO 2 was synthesized using hexamethylenetetramine (HMT) as a precipitator at 140 ºC. The degradation ratio of acid orange 7 (AO7) could achieve 98.8% with this co-doped CeO 2 under an irradiation of a 10 Watt compact fluorescent lamp (CFL). CeO 2 -TiO 2 could degrade 93.3% AO7 by the 10 Watt CFL. In contrast, the degradation ratio of AO7 only reached 43.0% by TiO 2 . However, a result of CeO 2 synthesized using Na 2 CO 3 precipitator gave a degradation ratio of 5.0%, i.e., a 94.9% reduction compared with that of HMT precipitator.

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In recent years, organic radicals have gained considerable attention because they open opportunities for new-generation electronics which may integrate spin, magnetic and quantum mechanical effects. However, air stable organic radicals...