Preparation and Photocatalytic Hydrogen Production Properties of Mesoporous CdS/TiO2 Composites

NANO ◽  
2020 ◽  
Vol 15 (02) ◽  
pp. 2050019
Author(s):  
Xiao-Li Wang ◽  
Ren-Rong Zheng ◽  
Hui Yu ◽  
Xiang-Ting Dong
Keyword(s):  
Hydrogen Production ◽  
Solvothermal Method ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Molar Ratio ◽  
Simulated Sunlight ◽  
Hydrogen Production Rate ◽  
Absorption Intensity ◽  
Wide Absorption Band ◽  
Average Size

The mesoporous CdS/TiO2 composites were synthesized by a sol–gel method combined with solvothermal method. The material showed the gel block-like structures which were composed of heterogeneous spherical gel particles, the average size of the particles was about 14[Formula: see text]nm, with specific surface area as 300.254[Formula: see text]m2[Formula: see text]g[Formula: see text]. The mesoporous CdS/TiO2 composites exhibited a wide absorption band to simulated sunlight whose adsorb wavelength reached to 550[Formula: see text]nm, its absorption intensity and catalytic performance of photocatalytic water-producing hydrogenation were also increased with the increase of CdS contents. When the molar ratio of TiO2:CdS was 1:1, the photocatalytic activity reached the highest, and the average hydrogen production rate reached 2167.32[Formula: see text][Formula: see text]mol[Formula: see text]g[Formula: see text][Formula: see text]h[Formula: see text].

Preparation and Modification of Y2Cu2O5/Y2O3 Photocatalysts for H2 Evolution under Simulated Sunlight Irradiation

2011 ◽  
Vol 239-242 ◽  
pp. 3001-3004 ◽  
Author(s):  
Li Zhang ◽  
Ke Long Huang ◽  
Hao Chen ◽  
Jian Hui Yan
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Production Rate ◽  
Hydrogen Reduction ◽  
Sol Gel ◽  
Oxalic Acid Solution ◽  
Impregnation Method ◽  
Simulated Sunlight ◽  
Hydrogen Production Rate ◽  
Sunlight Irradiation

Y2Cu2O5/Y2O3 (YCO) photocatalysts were prepared using sol-gel method. The photocatalysts were modified by Pt particles to prepare Pt-loaded composite (Pt-YCO) using hydrogen reduction method, and NiO/YCO were synthesized by impregnation method. These obtained samples were characterized by thermogravimetry and differential thermal analysis (TG/DTA), X-ray diffraction (XRD), and ultraviolet visible diffuse reflectance absorption spectra (UV-Vis DRS) techniques. Photocatalytic H2 evolution activity of the modified photocatalysts has been evaluated from aqueous oxalic acid solution used as sacrificial reagent under simulated sunlight irradiation. The result showed that when the concentration of the photocatalysts is 0.8 g·L-1， Pt-YCO photocatalyst exhibits higher photocatalytic activity compared with unloaded YCO. The hydrogen production rate is 4.12 mmol·h-1·g-1 with 1wt% loading amount of Pt, while the loading content is up to 2.5wt%, the hydrogen production rate of Pt-YCO photocatalyst deecreased instead. Whereas NiO/YCO composite exhibits less photocatalytic activity than that of pure YCO under the same conditions.

scholarly journals BiOCl/TiO2/diatomite composites with enhanced visible-light photocatalytic activity for the degradation of rhodamine B

2019 ◽  
Vol 10 ◽  
pp. 1412-1422 ◽  
Author(s):  
Minlin Ao ◽  
Kun Liu ◽  
Xuekun Tang ◽  
Zishun Li ◽  
Qian Peng ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Light Irradiation ◽  
Molar Ratio ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Photocatalytic

A BiOCl/TiO2/diatomite (BTD) composite was synthesized via a modified sol–gel method and precipitation/calcination method for application as a photocatalyst and shows promise for degradation of organic pollutants in wastewater upon visible-light irradiation. In the composite, diatomite was used as a carrier to support a layer of titanium dioxide (TiO2) nanoparticles and bismuth oxychloride (BiOCl) nanosheets. The results show that TiO2 nanoparticles and BiOCl nanosheets uniformly cover the surface of diatomite and bring TiO2 and BiOCl into close proximity. Rhodamine B was used as the target degradation product and visible light (λ > 400 nm) was used as the light source for the evaluation of the photocatalytic properties of the prepared BTD composite. The results show that the catalytic performance of the BTD composite under visible-light irradiation is much higher than that of TiO2 or BiOCl alone. When the molar ratio of BiOCl to TiO2 is 1:1 and the calcination temperature is 400 °C, the composite was found to exhibit the best catalytic effect. Through the study of the photocatalytic mechanism, it is shown that the strong visible-light photocatalytic activity of the BTD composite results mainly from the quick migration of photoelectrons from the conduction band of TiO2/diatomite to the surface of BiOCl, which promotes the separation effect and reduces the recombination rate of the photoelectron–hole pair. Due to the excellent catalytic performance, the BTD composite shows great potential for wide application in the field of sewage treatment driven by solar energy.

Hydrogen Production from Ethanol Steam Reforming over Ni-Cu/ZnO Catalyst

2011 ◽  
Vol 236-238 ◽  
pp. 1067-1072
Author(s):  
Li Ping Liu ◽  
Xiao Jian Ma ◽  
Peng Zhang ◽  
Ya Nan Liu
Keyword(s):  
Hydrogen Production ◽  
Steam Reforming ◽  
Fixed Bed ◽  
Surface Characteristics ◽  
Catalytic Performance ◽  
Fixed Bed Reactor ◽  
Molar Ratio ◽  
Ethanol Steam Reforming ◽  
Hydrogen Yield ◽  
Ethanol Steam

Hydrogen production by ethanol steam reforming over Ni-Cu/ZnO catalyst in the temperatures range of 250-550°C was studied on a fixed bed reactor. The effects of reaction temperature and water/ethanol molar ratio on hydrogen production were investigated. The structure and surface characteristics of the catalyst were measured by scanning electron microscopy (SEM), X-ray diffraction (XRD) and differential thermal analyzer (TG-DSC). The results show that the Ni-Cu/ZnO catalyst has good catalytic performance with higher hydrogen yield of 4.87molH2/molEtOH reacted. A comparison of hydrogen production from ethanol steam reforming over Ni-Cu/ZnO catalyst with over a commercial catalyst was made in this paper.

SOL-GEL SYNTHESIS AND CHARACTERIZATION OF COPPER STABILIZED ZIRCONIA NANOPARTICLES

2011 ◽  
Vol 25 (21) ◽  
pp. 2823-2839 ◽  
Author(s):  
Y. VAHIDSHAD ◽  
H. ABDIZADEH ◽  
H. R. BAHARVANDI ◽  
M. AKBARI BASERI
Keyword(s):  
Particle Size ◽  
Hydrogen Production ◽  
Calcination Temperature ◽  
Aging Temperature ◽  
Sol Gel ◽  
Chelating Agent ◽  
Molar Ratio ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sol Gel Synthesis

A sol-gel method is investigated to synthesize CuO – ZrO 2 nanoparticles as catalyst for hydrogen production from methanol. Finer precursor nanoparticles give rise to larger specific areas in catalyst which result in a high hydrogen production. The effects of some critical process parameters on the sol-gel synthesis of CuO – ZrO 2 nanoparticles are studied. These parameters are affected on synthesis of CuO – ZrO 2 when it is prepared with sol-gel method. Particle size and distribution are considered as the results. The parameters including the effect of calcination temperature, aging temperature, nature and concentration of catalyst (acidic or basic conditions), H 2 O /precursor molar ratio, and chelating agent that have been identified as most important, are focused. It is found that the calcination temperature strongly influenced the morphology and interaction between the active species and support, and hence the structure and catalytic performance. Nature and concentration of catalyst ( pH value), chelating agent, ( H 2 O /precursor) molar ratio and also aging temperature have influence on the nanoparticles. Thus, by controlling these factors, it is possible to vary the morphology and properties of the sol-gel-derived inorganic network over wide ranges. Morphology, particle size and distribution, phase evaluation, structure, and chemical analysis of the products are investigated by SEM, TEM, DTA/TG, XRD and EDX respectively.

Synthesis and Characterization of Ga Doped SiO2 Nanoparticles by a Reverse Micelle and Sol–Gel Processing

2010 ◽  
Vol 11 ◽  
pp. 151-157 ◽  
Author(s):  
Min Yeong Kim ◽  
Min Cheol Chu ◽  
Seong Jai Cho ◽  
Dong Sik Bae
Keyword(s):  
Reverse Micelle ◽  
Sol Gel ◽  
Sio2 Nanoparticles ◽  
Molar Ratio ◽  
Metal Alkoxide ◽  
Hydrolysis And Condensation ◽  
Micro Emulsion ◽  
Average Size ◽  
Gel Processing

Ga doped SiO2 nanosized particles have been synthesized using a reverse micelle technique combined with metal alkoxide hydrolysis and condensation. The size of the particles and the thickness of the coating can be controlled by manipulating the relative rates of the hydrolysis and condensation reactions of tetraethyl orthosilicate(TEOS) within the micro-emulsion. The average size of synthesized Ga doped SiO2 nanoparticles were about in the size range of 10-15 nm and Ga particles 2-5 nm. The effects of synthesis parameters, such as the molar ratio of water to TEOS, and the molar ratio of water to surfactant, are discussed.

Fabrication and Microstructure of ZnO-SiO2 Nanoparticles by a Reverse Micelle and Sol-Gel Processing

2006 ◽  
Vol 510-511 ◽  
pp. 790-793 ◽  
Author(s):  
Rak Hee Kim ◽  
Jae Won Kim ◽  
K.S. Park ◽  
Dong Sik Bae
Keyword(s):  
Reverse Micelle ◽  
Condensation Reaction ◽  
Sol Gel ◽  
Sio2 Nanoparticles ◽  
Molar Ratio ◽  
Metal Alkoxide ◽  
Hydrolysis And Condensation ◽  
Micro Emulsion ◽  
Average Size ◽  
Gel Processing

ZnO-SiO2 nanoparticles were synthesized using a reverse micelle technique combined with metal alkoxide hydrolysis and condensation. The size of the particles was controlled by manipulating the relative rates of the hydrolysis and condensation reaction of tetraethyl orthosilicate (TEOS) within the micro-emulsion. The average size of synthesized ZnO-SiO2 nanoparticles was in the range of 20-40 nm. The effects of synthesis parameters such as the molar ratio of water to precursor and the molar ratio of water to surfactant are discussed.

scholarly journals Effect of Copper Nanoparticles Dispersion on Catalytic Performance of Cu/SiO2Catalyst for Hydrogenation of Dimethyl Oxalate to Ethylene Glycol

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Yajing Zhang ◽  
Na Zheng ◽  
Kangjun Wang ◽  
Sujuan Zhang ◽  
Jing Wu
Keyword(s):  
Ethylene Glycol ◽  
Copper Nanoparticles ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Catalytic Performance ◽  
Bet Surface Area ◽  
X Ray ◽  
Dimethyl Oxalate ◽  
Effect Of Copper ◽  
Average Size

Cu/SiO2catalysts, for the synthesis of ethylene glycol (EG) from hydrogenation of dimethyl oxalate (DMO), were prepared by ammonia-evaporation and sol-gel methods, respectively. The structure, size of copper nanoparticles, copper dispersion, and the surface chemical states were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), temperature-programmed reduction (TPR), and X-ray photoelectron spectroscopy (XPS) and N2adsorption. It is found the structures and catalytic performances of the catalysts were highly affected by the preparation method. The catalyst prepared by sol-gel method had smaller average size of copper nanoparticles (about 3-4 nm), better copper dispersion, higher Cu+/C0ratio and larger BET surface area, and higher DMO conversion and EG selectivity under the optimized reaction conditions.

Fabrication and Microstructure of Ru Core Silica Shell Structure Particles by a Reverse Micelle and Sol-Gel Processing

2017 ◽  
Vol 863 ◽  
pp. 107-111 ◽  
Author(s):  
Son Jeong Hun ◽  
Jeong Ho Sohn ◽  
Dong Sik Bae
Keyword(s):  
Reverse Micelle ◽  
Sol Gel ◽  
Molar Ratio ◽  
Metal Alkoxide ◽  
Diffusion Controlled ◽  
Hydrolysis And Condensation ◽  
Micro Emulsion ◽  
Shell Particles ◽  
Average Size ◽  
Gel Processing

The Ru core SiO2 shell nano size particles have been synthesized within reverse micelle via metal alkoxide hydrolysis and condensation. The size of the particles and the thickness of the coating can be controlled by manipulating the relative rates of the hydrolysis and condensation reactions of tetraethoxysilane (TEOS) within the micro-emulsion. The average size of synthesized Ru core SiO2 shell particles was about in the size range of 15-40 nm. The average size and distribution of the synthesized Ru core SiO2 shell particles increased and narrow with R value increased. Otherwise, the average size and distribution of the synthesized Ru core SiO2 shell particles decreased and narrow with H value increased. TEM studies of particle formation indicate that the reaction process in the complex system containing reverse micelles and TEOS is governed by a diffusion-controlled process. The effects of synthesis parameters, such as the molar ratio of water to TEOS, and the molar ratio of water to surfactant, are discussed.

Photocatalytic and Sonophotocatalytic Activity of Magnetic Heterogeneous Fe3O4/TiO2/CuO Catalyst

2016 ◽  
Vol 864 ◽  
pp. 128-133
Author(s):  
Ardiansyah Taufik ◽  
Shofianina Djalaluidin ◽  
Rosari Saleh
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Ultrasound Irradiation ◽  
Catalytic Performance ◽  
Light Irradiation ◽  
Molar Ratio ◽  
Ferromagnetic Behavior ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Result Show

Magnetic heterogeneous Fe3O4/TiO2/CuO catalyst were synthesized using sol-gel method. The molar ratio of Fe3O4/TiO2/CuO were varied from 1:1:0.1 until 1:1:5. The all synthesized catalyst were characterized using X-ray Diffraction (XRD), Energy Dispersive X-ray (EDX), Field Emission Scanning Electron Microscope (FE-SEM), and Vibrating Sample Magnetometer (VSM). The result show that the magnetic heterogeneous Fe3O4/TiO2/CuO catalyst exhibit ferromagnetic behavior under room temperature. The catalytic performance were evaluated on the degradation of methylene blue under UV light and combination of ultrasound and UV-light Irradiation. The combination of ultrasound and UV-light irradiation exhibit batter catalytic performance than ultrasound irradiation only. The Magnetic heterogeneous Fe3O4/TiO2/CuO with molar ratio 1:1:0.1 shows highest catalytic performance. The reusability of catalyst were also observed.

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