Nanocomposite of Cu–TiO<sub>2</sub>–SiO<sub>2</sub> with High Photoactive Performance for Degradation of Rhodamine B Dye in Aqueous Wastewater

Li, Jinlong; Zhen, Deshuai; Sui, Guozhe; Zhang, Chunming; Deng, Qiaolin; Jia, Lei

doi:10.1166/jnn.2012.6438

Cited by 30 publications

(16 citation statements)

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“…Under UV/Vis irradiation, the electrons in the valence band (VB) of TiO 2 are promoted to Cu II species in the Cu x O clusters, which results in the transformation of Cu II into Cu I and the holes remain in the valence band . Li et al . showed that Cu‐modified TiO 2 ‐SiO 2 nanocomposites (Cu/Ti=0.01:1) prepared by a sol–gel method and calcined at 500 °C for 3 h exhibited a higher photocatalytic activity than commercial TiO 2 (Degussa P25) for the degradation of Rhodamine B dye under both UV and visible‐light irradiation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Copper Loadings on the Photocatalytic Activity of TiO₂‐SiO₂ Prepared at a Low Temperature for the Oxidation of Organic Pollutants in Water

et al. 2018

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The objective of this research is to examine how Cu modification can improve the photocatalytic activity of TiO2‐SiO2, to explain the correlation between the Cu concentration and the chemical state of Cu cations in the TiO2‐SiO2 matrix, and the photocatalytic activity under UV/solar irradiation. The Cu‐modified TiO2‐SiO2 photocatalysts were prepared by a low‐temperature sol–gel method from organic Cu, Si and Ti precursors with various Cu concentrations (0.05–3 mol %). The sol–gels were dried at 150 °C to obtain the photocatalysts in a powder form. The photocatalytic activity was determined by using a fluorescence‐based method of terephthalic acid decomposition. An up to three times increase in photocatalytic activity is obtained if the TiO2‐SiO2 matrix is modified with Cu in a narrow concentration range from 0.05 to 0.1 mol %. At higher Cu loadings, the photocatalytic activity of the Cu‐modified photocatalysts is lower than that of the un‐modified reference TiO2‐SiO2 photocatalyst. XRD was used to show that all Cu‐modified TiO2‐SiO2 composites with different Cu concentrations have the same crystalline structure as un‐modified TiO2‐SiO2 composites. The addition of Cu does not change the relative ratio between the anatase and brookite phases or unit cell parameters of the two TiO2 crystalline structures. We used Cu K‐edge X‐ray absorption near edge structure and extended X‐ray absorption fine structure analyses to determine the valence state and local structure of Cu cations in the Cu‐modified TiO2‐SiO2 photocatalysts. The results elucidate the mechanism responsible for the improved photocatalytic activity. In samples with a low Cu content, which exhibit the highest activity, Cu−O−Ti connections are formed, which suggests that the activity enhancement is caused by the attachment of CuII cations on the surface of the photocatalytically active TiO2 nanoparticles, so CuII cations may act as free‐electron traps, which reduce the intensity of recombination between electrons and holes at the TiO2 photocatalyst surface. At higher Cu loadings no additional Cu−O−Ti connections are formed, instead only Cu−O−Cu connections are established. This indicates the formation of amorphous or nanocrystalline copper oxide, which hinders the photocatalytic activity of TiO2.

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Section: Introductionmentioning

confidence: 99%

Effects of Different Copper Loadings on the Photocatalytic Activity of TiO₂‐SiO₂ Prepared at a Low Temperature for the Oxidation of Organic Pollutants in Water

et al. 2018

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“…It is considered that the dopant Si enhanced the water absorption and the more OH were formed. Thereby, the photo-catalytic activity of AC -SiO 2 was increased [17]. The XRD results show broad peak at 2θ = 48.0, 54.0 and 62.0 corresponding to the (200), ( 211) and (204) crystal planes reflection of anatase.…”

Section: Characterization Of the Photocatalystmentioning

confidence: 92%

Photocatalytic degradation of Rhodamine B using SiO2 supported on activated carbon

Nirmala¹,

Rajesh²,

Venckatesh³

et al. 2019

IJRAT

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SiO 2 sol was prepared by using Silicic acid with Tetrahydrofuran in the ratio of 1:2 along with Isopropanol solution and mixed with Coccinia indica bark activated carbon (AC) prepared using acid impregnation method. The grain size of the particles was calculated by X-ray diffraction, SEM and EDAX analysis reported the surface morphology and chemical composition. The crystal structure and elemental composition was analyzed by Fourier transform spectroscopy, band gap was calculated using UV-Visible spectroscopy. The photocatalytic experiments were performed with aqueous solution of Rhodamine B for 2h irradiation, direct photolysis of AC-SiO 2 contributed 85% decomposition in solar radiation for the optimized concentration of Rhodamine B dye.

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“…Theoretical simulations [37] indicate that Cu is the most stable when highly dispersed at anatase (101) surface and in a 2+ oxidation state. Electronic interactions facilitated via the mechanism of charge transfer (metal-to-metal charge transfer; Cu-O-Ti connections) increase the lifetime of surface holes and increase the photocatalytic activity through charge carrier separation [38].…”

Section: Introductionmentioning

confidence: 99%

Low-Cost Synthesis of Cu-Modified Immobilized Nanoporous TiO2 for Photocatalytic Degradation of 1H-Benzotriazole

et al. 2019

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Cu-modified immobilized nanoporous TiO 2 photocatalysts, prepared by electrochemical anodization of titanium foils, were obtained via four different synthesis methods: hydrothermal synthesis, anodization with Cu source, electrodeposition, and spin-coating, using two different copper sources, Cu(NO 3 ) 2 and Cu(acac) 2 . The objective of this research was to investigate how copper modifications can improve the photocatalytic activity of immobilized nanoporous TiO 2 under the UV/solar light irradiation. The best photocatalytic performances were obtained for Cu-modifications using spin-coating. Therefore, the effect of irradiated catalyst surface areas on the adsorption of model pollutants, methylene blue (MB) and 1H-benzotriazole (BT), was examined for samples with Cu-modification by the spin-coating technique. The mechanisms responsible for increased degradation of MB and BT at high Cu concentrations (0.25 M and 0.5 M) and decreased degradation at low Cu loadings (0.0625 M and 0.125 M) were explained. 1H-benzotriazole was used to study the photocatalytic activity of the given samples because it is highly toxic and present in most water systems. The characterization of the synthesized Cu-modified photocatalysts in terms of phase composition, crystal structure, and morphology were investigated using X-ray Diffraction, Raman Spectroscopy, Scanning Electron Microscopy, and Energy Dispersive X-ray spectroscopy.

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Nanocomposite of Cu–TiO₂–SiO₂ with High Photoactive Performance for Degradation of Rhodamine B Dye in Aqueous Wastewater

Cited by 30 publications

References 0 publications

Effects of Different Copper Loadings on the Photocatalytic Activity of TiO₂‐SiO₂ Prepared at a Low Temperature for the Oxidation of Organic Pollutants in Water

Effects of Different Copper Loadings on the Photocatalytic Activity of TiO₂‐SiO₂ Prepared at a Low Temperature for the Oxidation of Organic Pollutants in Water

Photocatalytic degradation of Rhodamine B using SiO2 supported on activated carbon

Low-Cost Synthesis of Cu-Modified Immobilized Nanoporous TiO2 for Photocatalytic Degradation of 1H-Benzotriazole

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Nanocomposite of Cu–TiO2–SiO2 with High Photoactive Performance for Degradation of Rhodamine B Dye in Aqueous Wastewater

Cited by 30 publications

References 0 publications

Effects of Different Copper Loadings on the Photocatalytic Activity of TiO2‐SiO2 Prepared at a Low Temperature for the Oxidation of Organic Pollutants in Water

Effects of Different Copper Loadings on the Photocatalytic Activity of TiO2‐SiO2 Prepared at a Low Temperature for the Oxidation of Organic Pollutants in Water

Photocatalytic degradation of Rhodamine B using SiO2 supported on activated carbon

Low-Cost Synthesis of Cu-Modified Immobilized Nanoporous TiO2 for Photocatalytic Degradation of 1H-Benzotriazole

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Nanocomposite of Cu–TiO₂–SiO₂ with High Photoactive Performance for Degradation of Rhodamine B Dye in Aqueous Wastewater

Effects of Different Copper Loadings on the Photocatalytic Activity of TiO₂‐SiO₂ Prepared at a Low Temperature for the Oxidation of Organic Pollutants in Water

Effects of Different Copper Loadings on the Photocatalytic Activity of TiO₂‐SiO₂ Prepared at a Low Temperature for the Oxidation of Organic Pollutants in Water