Effect of Zn, C introduction amount and calcination temperature on the photocatalytic reduction of Cu2+over ZnO/C/CeO2

doi:10.6023/A24040144

Abstract

In this study, the Zn(OH)₂/AR14/Ce(OH)₄ precursor was prepared by a co-deposition method using Ce(NO₃)₃·6H₂O as the cerium source, Zn(NO₃)₂·6H₂O as the zinc source, and acidic red 14 (AR14) as the carbon source. Then, ZnO/C/CeO₂ materials were obtained by calcination of the precursor in a tube furnace under N₂ atmosphere at different temperatures. The composite was characterized by XRD, SEM, FT-IR, PL and XPS. The results showed that the ternary composites were prepared successfully, and that the carbon existed in an amorphous form. Due to the thermal decomposition of the precursor at high temperatures, the synthesized products exhibit porous property. Due to the uniform distribution of reactants in the reaction system, the distribution of Zn, Ce and C in the obtained material was uniform. It can be seen that the introduction of Zn and the formation of Ce³⁺ in CeO₂ are conducive to the formation of oxygen vacancies, generating intermediate energy levels and thus broadening the light absorption range. Furthermore, oxygen vacancies can easily capture photoelectrons and thus accelerate their separation from holes in the value band, which can improve the photocatalytic efficiency of the resulted materials. The introduction of C into CeO₂ can produce a certain amount of carbon bonds, promote the effective separation of photoelectrons and holes, and improve the photocatalytic activity of the product. The effects of the amount of introduced Zn and C and the calcination temperature on the photocatalytic activity of ZnO/C/CeO₂ were investigated by the photocatalytic reduction of Cu²⁺. The results showed that when the amount of Zn(NO₃)₂·6H₂O in the reaction raw material was 0.5 g, the concentration of AR14 was 0.05 mmol/L, and the calcination temperature was 350 ℃ for the precusor, the photocatalytic reduction efficiency of Cu²⁺ over ZnO/C/CeO₂ is the highest, reaching 95.34%. The main reasons for the best photocatalytic performance are the highest oxygen vacancy concentration and maximum number of carbon bonds in ZnO/0.05C/2CeO₂-350, resulting in the highest separation efficiency of photogenerated electrons and holes.

Key words: ZnO/C/CeO₂, Cu²⁺, Photocatalytic reduction, Oxygen vacancy, Electron-hole pair

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Zhang Fanfan, Cai Yuantao, Tao Jianbo, Chang Guoju, Guo Xinchen, Hao Shiyou. Effect of Zn, C introduction amount and calcination temperature on the photocatalytic reduction of Cu²⁺over ZnO/C/CeO₂[J]. Acta Chimica Sinica, doi: 10.6023/A24040144.

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Zn, C引入量和煅烧温度对ZnO/C/CeO₂光催化还原Cu²⁺效率的影响

Effect of Zn, C introduction amount and calcination temperature on the photocatalytic reduction of Cu²⁺over ZnO/C/CeO₂

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Zn, C引入量和煅烧温度对ZnO/C/CeO2光催化还原Cu2+效率的影响