scholarly journals Hydrogen Production from Glycerol Photoreforming on TiO2/HKUST-1 Composites: Effect of Preparation Method

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 338 ◽  
Author(s):  
Fabián M. Martínez ◽  
Elim Albiter ◽  
Salvador Alfaro ◽  
Ana L. Luna ◽  
Christophe Colbeau-Justin ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Diffuse Reflectance Spectroscopy ◽  
Synergetic Effect ◽  
Recombination Reaction ◽  
Water Mixture ◽  
Electron Recombination ◽  
Glycerol Water ◽  
Time Resolved ◽  
Inorganic Semiconductors ◽  
Simulated Solar Light

Coupling metal-organic frameworks (MOFs) with inorganic semiconductors has been successfully tested in a variety of photocatalytic reactions. In this work we present the synthesis of TiO2/HKUST-1 composites by grinding, solvothermal, and chemical methods, using different TiO2 loadings. These composites were used as photocatalysts for hydrogen production by the photoreforming of a glycerol-water mixture under simulated solar light. Several characterization techniques were employed, including X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), infrared spectroscopy (FTIR), and time-resolved microwave conductivity (TRMC). A synergetic effect was observed with all TiO2/HKUST-1 composites (mass ratio TiO2/MOF 1:1), which presented higher photocatalytic activity than that of individual components. These results were explained in terms of an inhibition of the charge carrier (hole-electron) recombination reaction after photoexcitation, favoring the electron transfer from TiO2 to the MOF and creating reversible Cu1+/Cu0 entities useful for hydrogen production.

scholarly journals Synthesis of Ni- and N-Doped Titania Nanotube Arrays for Photocatalytic Hydrogen Production from Glycerol–Water Solutions

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1234
Author(s):  
Tiur Elysabeth ◽  
Dwi Annisa Agriyfani ◽  
Muhammad Ibadurrohman ◽  
Muhammad Nurdin ◽  
Slamet
Keyword(s):  
Hydrogen Production ◽  
Diffuse Reflectance Spectroscopy ◽  
Chemical Reduction ◽  
Nanotube Arrays ◽  
Water Mixture ◽  
Glycerol Water ◽  
X Ray ◽  
Titania Nanotube Arrays ◽  
Titania Nanotube ◽  
Doped Titania

Synthesis of Ni- and N-doped Titania Nanotube Arrays (Ni-N-TiNTAs) was conducted to produce photocatalysts for hydrogen production from a glycerol–water mixture. Ni-N-TiNTAs were synthesized in two steps, namely anodization and chemical reduction. Ti foil was anodized at 50 V for two h in an electrolyte solution containing 0.2% urea as a source of N atoms. Ni doping (at various content of 5%, 10%, 15%, and 20% wt) was performed by one-hour chemical reduction with sodium borohydride as a reducing agent. The photocatalyst was annealed at different temperatures, i.e., 500 °C, 550 °C, and 600 °C under 60 mL/min N2 gas for two h. On the basis of X-ray Diffraction (XRD) patterns, Ni-N-TiNTAs are mostly of anatase crystallite phase when annealed at 500 °C and 550 °C, while that of rutile was observable when calcination was done at 600 °C. The morphology of the photocatalysts was scrutinized by means of Field Emission Scanning Electron Microscopy (FESEM) imaging, which reveals nanotubular structures, with elemental composition measured by Energy Dispersive X-ray (EDX). The bandgap of the photocatalysts was analyzed using Ultraviolet Diffuse Reflectance Spectroscopy (UV DRS), which showed a lower value for the case of Ni-N-TiNTAs as compared to those of TiNTAs and N-TiNTAs. Photocatalytic tests showed that the highest amount of hydrogen produced (ca. 30973 μmol/m2) was obtained in the case of Ni-N-TiNTAs with a Ni content of 10wt%.

Photocatalytic hydrogen production from glycerol-water mixture over Pt-N-TiO2nanotube photocatalyst

2012 ◽  
Vol 37 (11) ◽  
pp. 1372-1381 ◽  
Author(s):  
Slamet ◽  
Dewi Tristantini ◽  
Valentina ◽  
Muhammad Ibadurrohman
Keyword(s):  
Hydrogen Production ◽  
Water Mixture ◽  
Glycerol Water ◽  
Photocatalytic Hydrogen Production

scholarly journals Solar Hydrogen from Glycerol-Water Mixture

2021 ◽  
Vol 8 ◽  
pp. 1-5
Author(s):  
Chong Fai Kait ◽  
Ela Nurlaela
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Glycolic Acid ◽  
Water System ◽  
Light Illumination ◽  
Water Mixture ◽  
Glycerol Water ◽  
Solar Hydrogen ◽  
Visible Light Illumination ◽  
Solar Hydrogen Production

The photocatalytic activity of titania supported bimetallic Cu-Ni photocatalysts were assessed for hydrogen production from water and also a mixture of glycerol-water system under visible light illumination. Addition of 2.0 mL glycerol to 8.0 mL water enhanced the solar hydrogen production from 6.1 mL to 9.5 mL. If metal was not incorporated onto TiO2 , the hydrogen production was minimal, 2.0 mL after 2 hr reaction. The band gap for bimetallic Cu-Ni/TiO2 was 2.78 eV compared to 3.16 eV for TiO2 . Photooxidation of glycerol produced glyceraldehyde, glycolic acid and oxalic acid.

Multifunctional Ni-Mg-Bimetal-Activated Zn(O,S) for Hydrogen Generation and Environmental Remediation with Simulated Solar-Light Irradiation

2021 ◽  
Author(s):  
Hairus Abdullah ◽  
Hardy Shuwanto ◽  
Dong-Hau Kuo
Keyword(s):  
Hydrogen Production ◽  
Hexavalent Chromium ◽  
Chemical Transformation ◽  
Environmental Remediation ◽  
Hydrogen Generation ◽  
Hydrogenation Reaction ◽  
Light Irradiation ◽  
Simulated Solar Light ◽  
Solar Light Irradiation ◽  
Photocatalytic Applications

Ni-Mg-Bimetal doped Zn(O,S) has been synthesized, characterized, and tested for several photocatalytic applications such as hydrogen production, hydrogenation reaction for chemical transformation, detoxification of hexavalent chromium, and mixed dye (MB...

scholarly journals Hydrothermal Synthesis of Iodine-Doped Nanoplates with Enhanced Visible and Ultraviolet-Induced Photocatalytic Activities

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Jiang Zhang ◽  
Zheng-Hong Huang ◽  
Yong Xu ◽  
Feiyu Kang
Keyword(s):  
Photocatalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Oxygen Vacancies ◽  
Diffuse Reflectance Spectroscopy ◽  
Synergetic Effect ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Photocatalytic Activities

The iodine-doped Bi2WO6(I-BWO) photocatalyst was prepared via a hydrothermal method using potassium iodide as the source of iodine. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The photocatalytic activity of I-BWO for the degradation of rhodamine B (RhB) was higher than that of pure BWO and I2-BWO regardless of visible light (>420 nm) or ultraviolet light (<400 nm) irradiation. The results of DRS analysis showed that the I-BWO and I2-BWO catalysts had narrower band gaps. XPS analysis proved that the multivalent iodine species including I0and were coadsorbed on the defect surface of Bi2WO6in I-BWO. The enhanced PL intensity revealed that a large number of defects of oxygen vacancies were formed by the doping of iodine. The enhanced photocatalytic activity of I-BWO for degradation of RhB was caused by the synergetic effect of a small crystalline size, a narrow band gap, and plenty of oxygen vacancies.

Fluorescence Polarization and Time Resolved Characteristics of Isopropanol-water Mixture

2011 ◽  
Vol 32 (12) ◽  
pp. 1303-1307
Author(s):  
韩彩芹 HAN Cai-qin ◽  
段培同 DUAN Pei-tong ◽  
吴斌 WU Bin ◽  
刘莹 LIU Ying ◽  
骆晓森 LUO Xiao-sen ◽  
...  
Keyword(s):  
Fluorescence Polarization ◽  
Water Mixture ◽  
Time Resolved

scholarly journals Broadband Time-Resolved Absorption and Dispersion Spectroscopy of Methane and Ethane in a Plasma Using a Mid-Infrared Dual-Comb Spectrometer

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6831
Author(s):  
Muhammad Ali Abbas ◽  
Luuk van Dijk ◽  
Khalil Eslami Jahromi ◽  
Mohammadreza Nematollahi ◽  
Frans J. M. Harren ◽  
...  
Keyword(s):  
Temporal Resolution ◽  
Chemical Kinetic ◽  
Methane Formation ◽  
Recombination Reaction ◽  
Time Resolved ◽  
Mid Infrared ◽  
Broadband Absorption ◽  
Total Measurement Time ◽  
5 Ghz ◽  
Absorption And Dispersion

Conventional mechanical Fourier Transform Spectrometers (FTS) can simultaneously measure absorption and dispersion spectra of gas-phase samples. However, they usually need very long measurement times to achieve time-resolved spectra with a good spectral and temporal resolution. Here, we present a mid-infrared dual-comb-based FTS in an asymmetric configuration, providing broadband absorption and dispersion spectra with a spectral resolution of 5 GHz (0.18 nm at a wavelength of 3333 nm), a temporal resolution of 20 μs, a total wavelength coverage over 300 cm−1 and a total measurement time of ~70 s. We used the dual-comb spectrometer to monitor the reaction dynamics of methane and ethane in an electrical plasma discharge. We observed ethane/methane formation as a recombination reaction of hydrocarbon radicals in the discharge in various static and dynamic conditions. The results demonstrate a new analytical approach for measuring fast molecular absorption and dispersion changes and monitoring the fast dynamics of chemical reactions over a broad wavelength range, which can be interesting for chemical kinetic research, particularly for the combustion and plasma analysis community.

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