Solar radiation synthesis of functional carbonaceous materials using Al 2 O 3 /TiO 2 -Cu-HA doped catalyst

Stanciu, Elena Manuela; Pascu, Alexandru; Roată, Ionuţ Claudiu; Croitoru, Cătălin; Țierean, Mircea Horia; Rosca, Julia Claudia Mirza; Hulka, Iosif

doi:10.1016/j.apsusc.2017.10.092

Cited by 4 publications

(6 citation statements)

References 49 publications

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“…Further details on the outlook and functioning of the installation could be found in other research, such as that described by Flamant et al [15], Apostol et al [18], and Stanciu et al [21].…”

Section: Spvd Process Of Pd/np Obtainingmentioning

confidence: 95%

“…e spraying gun-substrate distance was 200 mm, the copper support rotation speed was of 127 rpm, and the powder feed rate was 15 g/min. e custom catalyst composition has been optimized in our previous research [14], to obtain a good adherence to the copper substrate and to enhance the formation of several mixed oxide phases such as CaCu 3 Ti 4 O 12 and titanates (CaTiO 3 ) which enhance the nanoparticles growth, as determined from the previous XRD analysis results of the catalyst surface [21].…”

Section: 1mentioning

confidence: 99%

“…e total reaction time (Pd/C target vaporization and NP nucleation and growth) has been 10 min, optimized during prior experimental trials [21], considering the avoiding of catalyst "supersaturation" and carbon deposition on the glass walls of the reactor, occurring at reaction times longer than 10 minutes, which could cause the fracturing of the glass reactor. e pressure inside the reactor has been kept at 225 mmHg, and the argon flow rate was 0.35 L/min.…”

Section: Spvd Process Of Pd/np Obtainingmentioning

confidence: 99%

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Carbon Nanoparticle‐Supported Pd Obtained by Solar Physical Vapor Deposition

Pascu

Stanciu

Croitoru

et al. 2018

Advances in Materials Science and Engineering

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Palladium supported on carbon nanoparticles has been obtained on a specially designed ceramic catalyst, obtained by thermal spraying on a copper substrate, starting from Pd/C targets. Solar physical vapor deposition in argon, an environment-friendly and energy-efficient alternative to arc or chemical vapor deposition, has been employed as a means of target vaporization at CNRS-PROMES facility in Odeillo, France. e obtained nanoparticles have a spherical-porous morphology with diameters ranging from 50 to 120 nm and specific sorption areas of 50,000 m 2 /g. e XRD diffractograms indicate the presence of dominatingly crystalline short-range ordered graphene oxide layers, in contrast with the amorphous Pd/C starting precursor. e presence of palladium (0.6% wt.) at the surface of the nanoparticles was proved by the EDX and XRD analyses, making the synthesized material useful in applications such as catalysis or gas sorption.

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Section: Spvd Process Of Pd/np Obtainingmentioning

confidence: 95%

Section: 1mentioning

confidence: 99%

Section: Spvd Process Of Pd/np Obtainingmentioning

confidence: 99%

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Carbon Nanoparticle‐Supported Pd Obtained by Solar Physical Vapor Deposition

Pascu

Stanciu

Croitoru

et al. 2018

Advances in Materials Science and Engineering

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“…Solar ablation (SA), also called solar physical vapor deposition (SPVD), was used to prepare ZnO, Zn1-xAlxO, Zn1-xCoxO, Zn1-xBixO, metallic Zn nanophases, TiO 2 and Fe, Co, Mn-doped TiO 2 [9] or ZrO 2 [10] in "heliotron" type solar reactors in 2 kW furnaces. Also, in the same solar furnace were synthesized carbon nanoparticles obtained starting from Pd/C [11], long single-walled nanotubes [12] using graphite as a precursor and carbon microparticles from polymer waste radiation [13].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of ZnO-Nanostructured Particles Produced by Solar Ablation

Schiopu,

Oproescu,

Iana

et al. 2023

Materials

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Nowadays, nanotechnology offers opportunities to create new features and functions of emerging materials. Correlation studies of nanostructured materials’ development processes with morphology, structure, and properties represent one of the most important topics today due to potential applications in all fields: chemistry, mechanics, electronics, optics, medicine, food, or defense. Our research was motivated by the fact that in the nanometric domain, the crystalline structure and morphology are determined by the elaboration mechanism. The objective of this paper is to provide an introduction to the fundamentals of nanotechnology and nanopowder production using the sun’s energy. Solar energy, as part of renewable energy sources, is one of the sources that remain to be exploited in the future. The basic principle involved in the production of nanopowders consists of the use of a solar energy reactor concentrated on sintered targets made of commercial micropowders. As part of our study, for the first time, we report the solar ablation synthesis and characterization of Ni-doped ZnO performed in the CNRS-PROMES laboratory, UPR 8521, a member of the CNRS (French National Centre for Scientific Research). Also, we study the effect of the elaboration method on structural and morphological characteristics of pure and doped ZnO nanoparticles determined by XRD, SEM, and UV-Vis.

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“…Rare earth metals have a unique 4f electronic structure, which can be transferred between f-f and f-d configuration to become the trapping traps of optical electrons or cavities, but also can cause lattice distortion from the formation of oxygen vacancies to reduce the forbidden band width and broaden the spectral absorption range [ 19 ]. The addition of narrow band gap semiconductors such as ZrO 2 [ 20 ], SiO 2 , WO 3 [ 21 ], or Al 2 O 3 [ 22 ], is also considered as an effective way to improve the thermal stability and visible light photocatalytic activity of TiO 2 . Among them, SiO 2 –TiO 2 materials have been widely studied in the field of photocatalysis because they have higher photocatalytic activity than pure TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Degradation of Tetracycline on SiO2-TiO2-C Aerogel Photocatalysts under Visible Light

2022

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SiO2-TiO2-C aerogel photocatalysts with different carbon loadings were synthesized by using sol-gel chemistry. The anatase crystal and nonmetal carbon dopant were introduced during the sol preparation and formed by hydrothermal treatment, which can simultaneously enhance the adsorption ability and visible light photo-activity. A high surface area (759 g cm−3) SiO2-TiO2-C aerogel composite can remove up to 80% tetracycline hydrochloride within 180 min under visible light. The characterization of the gel structures shows that the homogeneous dispersion of O, Si, Ti and C in the skeleton, indicating that hydrothermal synthesis could provide a very feasible way for the preparation of composite materials. n(C):n(Ti) molar ratio of 3.5 gives the best catalytic performance of the hybrid aerogel, and the cyclic test still confirms over 60% degradation activity after seven use cycles. All catalysis reaction followed the pseudo-first-order rate reaction with high correlation coefficient. The electrons and holes in the compound could be effectively restrained with doping proper amount of C, and ESR results indicate that the oxidation process was dominated by the hydroxyl radical (•OH) and superoxide radical (•O2−) generated in the system.

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Solar radiation synthesis of functional carbonaceous materials using Al 2 O 3 /TiO 2 -Cu-HA doped catalyst

Cited by 4 publications

References 49 publications

Carbon Nanoparticle‐Supported Pd Obtained by Solar Physical Vapor Deposition

Carbon Nanoparticle‐Supported Pd Obtained by Solar Physical Vapor Deposition

Synthesis and Characterization of ZnO-Nanostructured Particles Produced by Solar Ablation

Degradation of Tetracycline on SiO2-TiO2-C Aerogel Photocatalysts under Visible Light

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