Fabrication of Ag@AgCl with Enhanced Plasmonic Photocatalysis Performance via a Deep Eutectic Solvent

2019 ◽  
Vol 72 (3) ◽  
pp. 200 ◽  
Author(s):  
Jianhua Ge ◽  
Yuchong Chen ◽  
Jing Xu ◽  
Yujie Liu ◽  
Long Zhang ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Photocatalytic Oxidation ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Oxidation Mechanism ◽  
Photocatalytic Property ◽  
X Ray Diffraction ◽  
X Ray ◽  
Plasmonic Photocatalyst ◽  
Facile Solvothermal Method

The plasmonic photocatalyst Ag@AgCl was successfully prepared through a facile solvothermal method via a deep eutectic solvent (DES), which is composed of choline chloride and urea. X-Ray diffraction, scanning electron microscopy, energy-dispersive X-ray, element-mapping, X-ray photoelectron spectroscopy, N2 absorption–desorption, and UV-vis diffuse reflectance techniques were adopted to analyse the performance of the plasmonic photocatalyst. Characterisation results indicated that the DES not only served as a solvent and Cl source, but also as a reductant. Meanwhile, the probable mechanism for the formation of Ag@AgCl is discussed, which revealed a visible light enhanced photocatalytic property for the degradation of benzidine. Furthermore, the photocatalyst showed no decrease in its catalytic activity even after five cycles of operation. Finally, a possible photocatalytic oxidation mechanism of Ag@AgCl is proposed.

Ionothermal Synthesis of Sodalite from Metakaolin

2012 ◽  
Vol 487 ◽  
pp. 789-792
Author(s):  
Xin Tao Zhou ◽  
Qi Feng Liu ◽  
Ying Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Infrared Spectrum ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure And Property ◽  
Ionothermal Synthesis ◽  
Scanning Electron

The sodalite was prepared with metakaolin by the ionothermal method in deep eutectic solvent(choline chloride/urea). Such factors as the Na2O/SiO2 ratio, crystallization temperature and time had effects on the structure and property. The high crystallinity and purity of sodalite can be obtained at the Na2O/SiO2 ratio of 3:1, and the temperature of 180°C for 60h. The product was characterized by means of X-ray diffraction, Infrared spectrum and scanning electron microscopy.

scholarly journals Deposition of Zinc–Cerium Coatings from Deep Eutectic Ionic Liquids

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2035
Author(s):  
Miguel Marín-Sánchez ◽  
Elena Gracia-Escosa ◽  
Ana Conde ◽  
Carlos Palacio ◽  
Ignacio García
Keyword(s):  
Carbon Steel ◽  
Current Density ◽  
Photoelectron Spectroscopy ◽  
Steel Substrate ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Electrochemical Corrosion ◽  
Corrosion Properties ◽  
Corrosion Tests ◽  
X Ray

This work studies the electrodeposition of zinc and cerium species on carbon steel substrates from choline chloride-based ionic liquid bath in order to develop a protective coating with anti-corrosion, sacrificial, and self-repairing properties. Hull cell tests were used to study the influence of the current density on composition of the coatings and their morphology. Surface morphology, chemical composition and oxidation state of the obtained coatings were examined by scanning electron microscopy (SEM), Energy Dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS), respectively. Furthermore, electrochemical characterization and corrosion tests were performed in order to evaluate the corrosion properties of the electrodeposited Zn–Ce coatings. The cathodic deposition of Zn–Ce was achieved for the first time using the deep eutectic solvent choline chloride-urea as an electrolyte. Cerium was incorporated in the coating as oxide or mixed oxide within the Zn metal matrix. The composition and morphology of the electrodeposited coating were dependent on the applied current density. Electrochemical corrosion tests showed similar corrosion rates for all the coatings. Nevertheless on scratched tests with a ratio area of 15:1, for Zn–Ce coatings cerium oxide somehow migrates from the coating to the high pH cathodic areas developed on the surface of the bare steel substrate. Further study is still necessary to improve the corrosion protection of the Zn–Ce coating for carbon steel.

Preparation and Characterization of Nitrogen-Doped TiO2 Decorated with Different Metal Ion

2012 ◽  
Vol 486 ◽  
pp. 368-372
Author(s):  
Hui Zhao ◽  
Yan Wang
Keyword(s):  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Metal Ion ◽  
Photocatalytic Oxidation ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Photocatalytic Activities ◽  
Diffuse Reflectance Spectrometry

In this paper, nanotubular TiO2 obtained by hydrothermal method was selected as precursor to prepare metal ion decorated TiO2-xNxvia a facile and one-pot method. As-synthesized M/TiO2-xNx (M references to Pd, Fe, Ni, Li) photocatalysts were characterized by means of X-ray diffraction, diffuse reflectance spectrometry, fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activities of different metal ion decorated TiO2-xNx samples were compared by monitoring the photocatalytic oxidation of propylene under both ultraviolet light (UV) and visible light (Vis) irradiation. It was found that Pd/TiO2-xNx sample possessed the highest photocatalytic activity under both UV and Vis irradiation. The better crystallinity, better visible light absorption, higher hydroxy concentration were contributed to the best photocatalytic performance of Pd/TiO2-xNx.

scholarly journals Fabrication and Photocatalytic Property of One-Dimensional SrTiO3/TiO2-xNxNanostructures

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Huarong Zhang ◽  
Miao Guashuai ◽  
Ma Xingping ◽  
Wang Bei
Keyword(s):  
Photoelectron Spectroscopy ◽  
Diffuse Reflectance Spectroscopy ◽  
Photocatalytic Property ◽  
Titanate Nanotubes ◽  
Mixed Solution ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
X Ray ◽  
Transmission Electron ◽  
Property Changes

One-dimensional SrTiO3/TiO2−xNxnanostructures were prepared by the hydrothermal method and investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) measurements. The photocatalytic activities of the prepared samples were evaluated by photodegrading the methylene blue (MB) solution. According to the characterizations, the intermediate product of SrTiO3/titanate nanotubes was presented after hydrothermal processing of the TiO2−xNxnanoparticles with the mixed solution of NaOH and Sr(NO3)2. The final product of SrTiO3/TiO2−xNxnanorods was obtained after calcining the intermediate. As compared to the TiO2−xNxnanoparticles, the absorption performance of SrTiO3/titanate nanotubes or SrTiO3/TiO2−xNxnanorods was depressed, instead of improving it. The mechanisms of the absorption property changes were discussed. The SrTiO3/TiO2−xNxnanorods presented better photocatalytic activity than the TiO2−xNxnanoparticles or nanorods. However, due to overmuch adsorption, the SrTiO3/titanate nanotubes gave ordinary photocatalytic performances.

Solid-Phase Synthesis and Photocatalytic Property of Cobalt-Doped TiO2 Mesoporous Materials

2011 ◽  
Vol 217-218 ◽  
pp. 1462-1468 ◽  
Author(s):  
Shao You Liu ◽  
Qing Ge Feng
Keyword(s):  
Photoelectron Spectroscopy ◽  
Solid Phase ◽  
Photocatalytic Property ◽  
Textural Properties ◽  
Bet Surface Area ◽  
X Ray Diffraction ◽  
Bending Vibration ◽  
Toluene Oxidation ◽  
X Ray ◽  
Transmission Electron

Mesoporous cobalt-doped TiO2 (Co-TiO2) material has been synthesized by solid-state reaction route. The textural properties of the samples are monitored by the X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) and energy dispersive spectroscopy(EDS), Raman spectroscopy, N2-physisorption, Fourier transform infrared spectroscopy (FT-IR), ultraviolet visible light spectroscopy (UV-Vis) and X-ray photoelectron spectroscopy(XPS). It is shown that the mesoporous Co-TiO2 is consisted of polycrystalline with some amorphous mixture and trace cobalt oxide. Cobalt has been incorporated into the framework of anatase TiO2. The bending vibration at 1124 cm-1 of Co-O-Ti bond in mesoporous Co-TiO2 material is confirmed. Interestingly, it possesses a large BET surface area (97.6 m2/g) and a narrow distribution of pore size presenting a better photocatalytic reactivity for toluene oxidation. Within 150 min irradiation, the maximum conversion (95 mol%) of toluene oxidation is obtained.

scholarly journals Green Preparation of High Surface Area Cu-Au Bimetallic Nanostructured Materials by Co-Electrodeposition in a Deep Eutectic Solvent

2021 ◽  
Author(s):  
Elena Plaza Mayoral ◽  
Paula Sebastián Pascual ◽  
Kim Nicole Dalby ◽  
Kim Degn Jensen ◽  
Ib Chorkendorff ◽  
...  
Keyword(s):  
Surface Area ◽  
Nanostructured Materials ◽  
Photoelectron Spectroscopy ◽  
Choline Chloride ◽  
High Surface ◽  
High Surface Area ◽  
Deep Eutectic Solvent ◽  
Fold Increase ◽  
Active Surface Area ◽  
X Ray

In this work we present an electrodeposition method in a deep eutectic solvent (DES) to prepare bimetallic high surface area nanostructures of Cu and Au with tunable structure and composition. The metal electrodeposition performed in green choline chloride within a urea deep eutectic solvent allows us to tailor the size, morphology and elemental composition of the deposits. We combine electrochemical methods with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDS) to characterize the electrodeposited nanostructured materials. We assess the increase of the electroactive surface area through the analysis of the lead underpotential deposition (UPD) on the prepared films. We observe a 5 to 15-fold increase of the active surface area compared to flat surfaces of polycrystalline Cu or Au. Our work reports, for the first time, a green route for the electrodeposition of Cu-Au bimetallic nanostructures in a deep eutectic solvent.

scholarly journals Green Preparation of High Surface Area Cu-Au Bimetallic Nanostructured Materials by Co-Electrodeposition in a Deep Eutectic Solvent

2021 ◽  
Author(s):  
Elena Plaza Mayoral ◽  
Paula Sebastián Pascual ◽  
Kim Nicole Dalby ◽  
Kim Degn Jensen ◽  
Ib Chorkendorff ◽  
...  
Keyword(s):  
Surface Area ◽  
Nanostructured Materials ◽  
Photoelectron Spectroscopy ◽  
Choline Chloride ◽  
High Surface ◽  
High Surface Area ◽  
Deep Eutectic Solvent ◽  
Fold Increase ◽  
Active Surface Area ◽  
X Ray

In this work we present an electrodeposition method in a deep eutectic solvent (DES) to prepare bimetallic high surface area nanostructures of Cu and Au with tunable structure and composition. The metal electrodeposition performed in green choline chloride within a urea deep eutectic solvent allows us to tailor the size, morphology and elemental composition of the deposits. We combine electrochemical methods with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDS) to characterize the electrodeposited nanostructured materials. We assess the increase of the electroactive surface area through the analysis of the lead underpotential deposition (UPD) on the prepared films. We observe a 5 to 15-fold increase of the active surface area compared to flat surfaces of polycrystalline Cu or Au. Our work reports, for the first time, a green route for the electrodeposition of Cu-Au bimetallic nanostructures in a deep eutectic solvent.

Oxidation of Ni-toughened nc-TiN/a-SiNx nanocomposite thin films

2005 ◽  
Vol 20 (10) ◽  
pp. 2754-2762 ◽  
Author(s):  
Sam Zhang ◽  
Deen Sun ◽  
Xianting Zeng
Keyword(s):  
Thin Films ◽  
Photoelectron Spectroscopy ◽  
Oxidation Mechanism ◽  
Grazing Incidence ◽  
Threshold Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Oxygen Ions ◽  
Atomic Force

Oxidation behavior of Ni-toughened reactively sputtered composite thin films of nanocrystalline TiN and amorphous SiNx [denoted as nc-TiN/a-SiNx(Ni)] was explored to understand the oxidation mechanism. The films were deposited on silicon substrate using a magnetron sputtering technique. Oxidation was carried out from 450 °C up to 1000 °C. The nature of the oxidation was determined using x-ray photoelectron spectroscopy. The microstructure of the oxidized films was studied using grazing incidence x-ray diffraction. The topography was characterized using atomic force microscopy. It was determined that the oxidation of the nc-TiN/a-SiNx(Ni) thin film proceeds primarily through a diffusion process, in which nickel atoms diffuse outward and oxygen ions inward. The oxidation takes place by progressive replacement of nitrogen with diffused oxygen. Five regions were identified in the oxidized layer from surface into the film. For films doped with 2.1 at.% Ni, a threshold temperature of 850 °C was determined, below which, excellent oxidation resistance prevails but above which, oxidation takes place at exponential rate, accompanied by abrupt increase of surface roughness.

Investigation of the Effect of Uv-Assisted Oxidation and Nitridation of Hafnium Metal Films

2003 ◽  
Vol 780 ◽  
Author(s):  
C. Essary ◽  
V. Craciun ◽  
J. M. Howard ◽  
R. K. Singh
Keyword(s):  
Uv Radiation ◽  
Photoelectron Spectroscopy ◽  
Grazing Angle ◽  
X Ray Diffraction ◽  
Metal Thin Films ◽  
X Ray ◽  
Force Microscopy ◽  
Si Substrates ◽  
Atomic Force ◽  
Silicon Interface

AbstractHf metal thin films were deposited on Si substrates using a pulsed laser deposition technique in vacuum and in ammonia ambients. The films were then oxidized at 400 °C in 300 Torr of O2. Half the samples were oxidized in the presence of ultraviolet (UV) radiation from a Hg lamp array. X-ray photoelectron spectroscopy, atomic force microscopy, and grazing angle X-ray diffraction were used to compare the crystallinity, roughness, and composition of the films. It has been found that UV radiation causes roughening of the films and also promotes crystallization at lower temperatures.Furthermore, increased silicon oxidation at the interface was noted with the UVirradiated samples and was shown to be in the form of a mixed layer using angle-resolved X-ray photoelectron spectroscopy. Incorporation of nitrogen into the film reduces the oxidation of the silicon interface.

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