Photocatalytic activity of N-doped TiO2: photocatalytic synthesis of o-aminophenol at room temperature

Wang, Huqun; Jun-ping, Yan; Zhang, Zhimin; Chang, Wenfu

doi:10.1007/s11144-009-0015-3

Cited by 13 publications

(3 citation statements)

References 14 publications

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“…The peak of binding energy of N is mainly at 400.0 eV, and the peak at 397.8 eV is relatively small. The binding energy at 397.8 eV indicates that the nitrogen atom in the form of beta-N ( β -N) exists in the crystal, and that at 400.0 eV indicates that the nitrogen atom in the form of gamma-N ( γ -N) exists in the crystal or in the form of N-N and N-O bond [ 44 ]. Similarly, according to the Lorentz fitting results of the N1s peak, the ratio of β -N to γ -N in the films deposited under the conditions of r = 1/1 and r = 1/3 is estimated to be 2.68 and 2.03, respectively.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Copper Nitride Films with Superior Photocatalytic Activity through Magnetron Sputtering

et al. 2020

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TiO2 possesses a wide forbidden band of about 3.2 eV, which severely limits its visible light absorption efficiency. In this work, copper nitride (Cu3N) films were prepared by magnetron sputtering at different gas flow ratios. The structure of the films was tested by scanning electron microscope, X-ray diffractometer, and X-ray photoelectron spectroscope. Optical properties were investigated by UV-vis spectrophotometer and fluorescence spectrometer. Results show that the Cu3N crystal possesses a typical anti-ReO3 crystal structure, and the ratio of nitrogen and Cu atoms of the Cu3N films was adjusted by changing the gas flow ratio. The Cu3N films possess an optical band gap of about 2.0 eV and energy gap of about 2.5 eV and exhibit excellent photocatalytic activity for degrading methyl orange (degradation ratio of 99.5% in 30 min). The photocatalytic activity of Cu3N mainly originates from vacancies in the crystal and Cu self-doping. This work provides a route to broaden the forbidden band width of photocatalytic materials and increase their photoresponse range.

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Section: Resultsmentioning

confidence: 99%

Preparation of Copper Nitride Films with Superior Photocatalytic Activity through Magnetron Sputtering

et al. 2020

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“…The critical load of WO 3 /S-N-TiO 2 is close to that of WO 3 /TiO 2 since both coatings possess alike interface properties stemming from the hybrid structure of TiO 2 and WO 3 . It seems that S, N co-doped TiO 2 enhances the interface adhesion due to the densifying layer resulting from crystalline refinement of doped TiO 2 , the N, S co-doped TiO 2 has a larger specific surface area [15] than pure TiO 2 , the huge surface energy is helpful for the improvement of interface adhesion. It can also be concluded that the added transitional layer increases the total coating thickness and accordingly strengthen the adhesion with respect to unitary TiO 2 coating.…”

Section: Resultsmentioning

confidence: 99%

Photocatalystic Cathodic Protection of TiO<sub>2</sub> Coating on AZ31 Magnesium Alloy

Wang

2011

MSF

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Nano TiO2and S, N co-doped TiO2composite coatings with WO3transitional layer were deposited on AZ31 magnesium alloy by sol-gel method. The morphologies, structure, mechanical properties, compositional depth profiles and anti-corrosion performance of the as prepared coatings were characterized by scanning electron microscope, X-ray diffraction, nanoscratch test, glowing discharge optical emission spectrometry and electrochemical method, respectively. The results show that the nano TiO2coatings are continuous, uniform and dense with thickness ca.3-5μm, elements in the interface diffuse mutually during heat treatment; S-N co-doped TiO2enhances the interface adhesion, WO3transitional layer increases the total coating thickness and strengthens the adhesion to substrate with respect to unitary TiO2coating; S, N co-doped TiO2acts as visible light photocatalyst that can provide permanent cathodic protection for AZ31 magnesium using WO3as electron restoring material.

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“…Obviously, the current industrial hydrogenation processes have some disadvantiges, such as high temperature (vapor-phase processes) and toxic, flammable, environmentally hazardous organic solvents (liquid phase processes). Great efforts have been made to develop a greener hydrogenation catalyst and more cost-effective processes, and numerous methods for the reduction of aromatic nitro have been reported in the literature, such as catalytic hydrogenation, − catalytic transfer hydrogenation, − CO/H 2 O conditions, − and other reduction systems; − however, the problems remain unsolved. Therefore, the development of more effective, less toxic, and handle-convenient catalysts for this transformation is still highly desirable.…”

Section: Introductionmentioning

confidence: 99%

Pd Nanoparticles in Ionic Liquid Brush: A Highly Active and Reusable Heterogeneous Catalytic Assembly for Solvent-Free or On-Water Hydrogenation of Nitroarene under Mild Conditions

Shi

et al. 2011

ACS Catal.

159

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Experimental Section1 H and 13 C NMR spectra were recorded on a Bruker DRX 300 spectrometer in CDCl 3 , and tetramethylsilane (TMS) was used as internal standard. The structures of the synthesized materials were confirmed by TEM using a JEM-3010 transmission electron microscope operating at an accelerating voltage of 300kv. Histograms of particle size distribution of Pd nanoparticles were obtained from the TEM images by measuring more than 200 particles in each sample. The surface area of the catalysts was determined from full nitrogen adsorption and desorption isotherms at 77K using a Sorptometer ST-03A. The catalysts were outgassed for four hours at 573K prior to measurements. Infrared spectra were recorded with a FT-IR Bruker EQUINX-55 Spectrometer equipped with a KBr beam splitter and a TGS detector. The chemical analyses of the content of palladium, respectively, were carried out with an ICP-OES (inductively coupled plasma-optical emission spectrometer) Vista (Varian). The samples (amount of about 10 mg) were digested in a mixture of 1.5 mL of HCl (37%), 0.5 mL of HNO 3 (65%), and 1 mL of HF (40%) by heating.Generally, the solutions were diluted to a volume of 50 mL using a volumetric flask. EDXA measurements were performed on a Philips-FEI Quanta 200 scanning electron microscope. This apparatus was equipped with a Si-Li energy dispersive, quantitative chemical analysis was performed for Si and Pd. C, H and N elemental analysis were performed on a Perkin-Elmer 2400 CHN elemental analyzer. The powder XRD pattern of SiO 2 -BisILs[PF 6 ]-Pd 0 (2c) was recorded on a Rigalcu D/Max-3c X-ray diffractometer (Cuka, Ni filter). Gas chromatography was performed on an Agilent GC 6890N with a FID detector equipped with an DB-35 column (30 m long, 0.25 mm inner diameter). Parameters were as follows: initial temperature 70 ℃; initial time 3 min; ramp 8 ℃•min -1 ; final temperature 180 ℃; final time 2 min; injector temperature 220 ℃;detector temperature 250 ℃; injection volume 1.0 µL. The high boiling point substrates and the products were analyzed by using HPLC. All hydrogenated products were initially identified using authentic commercial samples of the expected products. Melting point is uncorrected.Materials. PdCl 2 (AR grade), imidazole (AR grade), sodium borohydride (AR grade), 1-chlorooctane (AR grade), KPF 6 , silica gel (surface area, 385 m 2 g -1 ), nitrobenzene, 4-nitrophenol, 2-nitrophenol and other aromatic nitro compounds were used as received. 1,4-dibromobutane and 3-chloropropyltriethoxy silane, purchased from Alfa Aesar. All organic solvents (toluene, methanol, ethanol, and so on.) were dried under standard purification conditions.

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Photocatalytic activity of N-doped TiO2: photocatalytic synthesis of o-aminophenol at room temperature

Cited by 13 publications

References 14 publications

Preparation of Copper Nitride Films with Superior Photocatalytic Activity through Magnetron Sputtering

Preparation of Copper Nitride Films with Superior Photocatalytic Activity through Magnetron Sputtering

Photocatalystic Cathodic Protection of TiO<sub>2</sub> Coating on AZ31 Magnesium Alloy

Pd Nanoparticles in Ionic Liquid Brush: A Highly Active and Reusable Heterogeneous Catalytic Assembly for Solvent-Free or On-Water Hydrogenation of Nitroarene under Mild Conditions

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