Architecture of Cu2O@TiO2 core–shell heterojunction and photodegradation for 4-nitrophenol under simulated sunlight irradiation

Chu, Sheng Yuan; Zheng, Xinmei; Kong, Fei; Wu, Guohao; Luo, Leilei; Guo, Yong; Liu, Honglin; Wang, Ying; Yu, Hailing; Zou, Zhigang

doi:10.1016/j.matchemphys.2011.06.004

Cited by 67 publications

(48 citation statements)

References 22 publications

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“…When this was done, little 4-NP was adsorbed to the catalyst. As shown in Fig 6A, complete reduction of 4-NP occurred in 160 s, which is faster than previously reported rates (Zeng et al, 2013;Chu et al, 2011;Posada et al, 2006;Liu et al, 2013;Yao et al, 2015). We did experiment to investigate the adsorption effect in the absence of Cu/ Cu 2 O/CuO@C, the result showed that UV-vis adsorption spectra of 4-NP didn't change during 10 h with the addition of NaBH4 (Fig.…”

Section: Catalytic Capabilitymentioning

confidence: 59%

Cu/Cu2O/CuO loaded on the carbon layer derived from novel precursors with amazing catalytic performance

Zhao

Tan

et al. 2016

Science of The Total Environment

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• We present an effective catalyst for reductive degradation of organic dyes and phenols in water.• Compared with noble metals, Cu/Cu 2 O/ CuO@C particles are more efficient and less expensive • The porous structure provided a large contact area and channels for the pollutions and active site. , infrared spectroscopy and Raman analysis, revealed that it was composed of graphitized carbon with numerous nanoparticles (100 nm in diameter) of Cu/CuO/Cu 2 O that were uniformly distributed on internal and external surfaces of the carbon support. Gallic acid (GA) has been used as both organic ligand and carbon precursor with metal organic frameworks (MOFs) as the sacrificial template and metal oxide precursor in this green synthesis. The material combined the advantages of MOFs and Cu-containing materials, the porous structure provided a large contact area and channels for the pollutions, which results in more rapid catalytic degradation of pollutants and leads to greater efficiency of catalysis. The material gave excellent catalytic performance for organic dyes and phenols. In this study, Cu/Cu 2 O/CuO@C was used as catalytic to reduce 4-NP, which has been usually adopted as a model reaction to check the catalytic ability. Catalytic experiment results show that 4-NP was degraded approximately 3 min by use of 0.04 mg of catalyst and the conversion of pollutants can reach more than 99%. The catalyst exhibited little change in efficacy after being utilized five times. Rates of degradation of dyes, such as Methylene blue (MB) and Contents lists available at ScienceDirectScience of the Total Environment j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / s c i t o t e n v Rhodamine B (RhB) and phenolic compounds such as O-Nitrophenol (O-NP) and 2-Nitroaniline (2-NA) were all similar.

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Section: Catalytic Capabilitymentioning

confidence: 59%

Cu/Cu2O/CuO loaded on the carbon layer derived from novel precursors with amazing catalytic performance

Zhao

Tan

et al. 2016

Science of The Total Environment

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“…Therefore, the preparation of interconnected heterostructures with a large interface between two semiconductors was proposed for improvement of the charge transfer efficiency. For example, Cu2O@TiO2 core-shell photocatalyst was prepared by in situ hydrolysis and crystallization method (Figure 13), and tested under solar radiation for 4-nitrophenol degradation [101]. It was found that Cu2O@TiO2 had absorption properties similar to pure Cu2O: strong visible light absorption in the range of 400-600 nm (Figure 14a), and was the most active among other coupled photocatalysts, e.g., prepared by physical mixing Cu2O/TiO2(PM) and by chemical method denoted to Cu2O/TiO2 (Figure 14b).…”

Section: Cu 2 O-tio 2 Heterojunctionmentioning

confidence: 99%

“…It was found that Cu2O@TiO2 had absorption properties similar to pure Cu2O: strong visible light absorption in the range of 400-600 nm (Figure 14a), and was the most active among other coupled photocatalysts, e.g., prepared by physical mixing Cu2O/TiO2(PM) and by chemical method denoted to Cu2O/TiO2 (Figure 14b). Moreover, weaker photoluminescence signals for Cu2O@TiO2 sample than for pure Cu2O suggested retardation of charge carriers' recombination, probably because introduction of TiO2 shell could reduce the surface oxygen vacancies and defect in Cu2O core [101]. [100].…”

Section: Cu 2 O-tio 2 Heterojunctionmentioning

confidence: 99%

On the Origin of Enhanced Photocatalytic Activity of Copper-Modified Titania in the Oxidative Reaction Systems

2017

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Modification of titania with copper is a promising way to enhance the photocatalytic performance of TiO 2 . The enhancement means the significant retardation of charge carriers' recombination ratio and the introduction of visible light activity. This review focuses on two main ways of performance enhancement by copper species-i.e., originated from plasmonic properties of zero-valent copper (plasmonic photocatalysis) and heterojunctions between semiconductors (titania and copper oxides). The photocatalytic performance of copper-modified titania is discussed for oxidative reaction systems due to their importance for prospective applications in environmental purification. The review consists of the correlation between copper species and corresponding variants of photocatalytic mechanisms including novel systems of cascade heterojunctions. The problem of stability of copper species on titania, and the methods of its improvement are also discussed as important factors for future applications. As a new trend in the preparation of copper-modified titania photocatalyst, the role of particle morphology (faceted particles, core-shell structures) is also described. Finally, in the conclusion section, perspectives, challenges and recommendations for future research on copper-modified titania are formulated.

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“…The coupling of Cu 2 O with TiO 2 has attracted great attention in recent years [4][5][6][7]. Zou et al reported the architecture of Cu 2 O-TiO 2 core-shell heterojunction prepared by a facile soft chemical method using CuCl and tetrabutyl titanate (Ti(OBu) 4 ) as the raw materials, which exhibited high photocatalytic activity and stability for 4-nitrophenol degradation under simulated sunlight [8]. Peng et al synthesized the Cu 2 O/TiO 2 hetero-structures by an alcohol-aqueous based chemical precipitation method, and found the dramatically improved photocatalytic activity of the heterostructure [9].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Cu₂O-TiO₂Nano-composite with High Photocatalytic Performance under Simulated Solar Light

Yan

et al. 2016

MATEC Web Conf.

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Cu 2 O-P25 (TiO 2 ) nano-heterostructures with different mass ratios were synthesized via a wet chemical precipitation and hydrothermal method, and were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), UV-vis diffuse reflectance spectra (DRS), and X-ray photoelectron spectroscopy (XPS). DRS results showed that the light absorption of P25 extended to the visible light region with the loading of Cu 2 O. XPS results showed that Cu existed in the state of Cu + in the presence of hydroxylamine hydrochloride, confirming the formation of Cu 2 O. The obtained products exhibited efficient photocatalytic performance in degradation of methyl orange (MO) and methylene blue (MB) under simulated solar light. The sample of 5% Cu 2 O-P25 exhibited the highest photocatalytic activity among all as-prepared samples. And the photocatalysts can be recycled without obvious loss of photocatalytic activity.

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Architecture of Cu2O@TiO2 core–shell heterojunction and photodegradation for 4-nitrophenol under simulated sunlight irradiation

Cited by 67 publications

References 22 publications

Cu/Cu2O/CuO loaded on the carbon layer derived from novel precursors with amazing catalytic performance

Cu/Cu2O/CuO loaded on the carbon layer derived from novel precursors with amazing catalytic performance

On the Origin of Enhanced Photocatalytic Activity of Copper-Modified Titania in the Oxidative Reaction Systems

Fabrication of Cu₂O-TiO₂Nano-composite with High Photocatalytic Performance under Simulated Solar Light

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Architecture of Cu2O@TiO2 core–shell heterojunction and photodegradation for 4-nitrophenol under simulated sunlight irradiation

Cited by 67 publications

References 22 publications

Cu/Cu2O/CuO loaded on the carbon layer derived from novel precursors with amazing catalytic performance

Cu/Cu2O/CuO loaded on the carbon layer derived from novel precursors with amazing catalytic performance

On the Origin of Enhanced Photocatalytic Activity of Copper-Modified Titania in the Oxidative Reaction Systems

Fabrication of Cu2O-TiO2Nano-composite with High Photocatalytic Performance under Simulated Solar Light

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Product

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Fabrication of Cu₂O-TiO₂Nano-composite with High Photocatalytic Performance under Simulated Solar Light