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• W4220858741 abstract "The Cu/CeO 2 nanoporous composite material was prepared via a one-step and energy-saving method of solution combustion synthesis (SCS) for the first time. The phase composition, surface morphology and optical characteristics of Cu/CeO 2 were studied. The results show that the SCS products are composed of cubic fluorite CeO 2 and Cu. Due to the generation and escape of gas during the synthetic reaction, the SCS CeO 2 shows porous structure, in which the mesopores (diameter 10–17 nm) nested in the wall of large pores (diameter 80–300 nm). X-ray photoelectron spectroscopy (XPS) outcomes indicate that the oxygen vacancy concentration of CeO 2 increases (18.97%–30.93%) with the increase of Cu concentration. The decoration of Cu greatly enhances the catalytic activity of CeO 2 nanomaterials. 30 wt% Cu/CeO 2 composite material shows the best photocatalytic activities for the degradation of methyl orange (MO) (95.99%), which is about 4.3 times that of CeO 2 at the same time (120min). UV-vis diffuse reflectance spectroscopy (DRS) results show that the semiconductor band gap is reduced with the addition of metallic Cu, which leads to the enhancement of photocatalytic activity. The free radical trapping experiments demonstrate that ·O 2 – and h + were the main active species in the photocatalytic degradation of MO. Based on the above results, a hypothesized mechanism for enhanced photocatalysis of Cu/CeO 2 nanomaterials was proposed: the porous structure provides more reactive sites and channels for mass transfer, and the presence of metallic Cu improves the oxygen vacancy concentration of CeO 2 and then promote charge-carrier separation, which helps enhance the photocatalytic performance of Cu/CeO 2 . Micro/nano-scale porous Cu/CeO 2 was prepared in one-step by a modified SCS method for the first time. The porous structure provides more reactive sites and channels for mass transfer, and the presence of metallic Cu improves the oxygen vacancy concentration of CeO 2 and then promotes charge-carrier separation, which improves the photocatalytic performance by 4.3 times. • Micro/nano-scale porous Cu/CeO 2 was prepared in one-step by a modified SCS method for the first time. • The introduce of metallic Cu improves the oxygen vacancy concentration of the CeO 2 . • The photocatalytic performance of 30% Cu/CeO 2 is 4.3 times that of CeO 2 with 120min." @default.
• W4220858741 created "2022-04-03" @default.
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• W4220858741 date "2023-02-01" @default.
• W4220858741 modified "2023-10-06" @default.
• W4220858741 title "One-step solution combustion synthesis of micro-nano-scale porous Cu/CeO2 with enhanced photocatalytic properties" @default.
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• W4220858741 doi "https://doi.org/10.1016/j.jre.2022.02.013" @default.
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