Synthesis, characterization and photocatalytic activity of a new type of high-efficiency polyacid composite

A new type of photocatalyst is proposed on the basis of aero-β-Ga2O3, which is a material constructed from a network of interconnected tetrapods with arms in the form of microtubes with nanometric walls. The aero-Ga2O3 material is obtained by annealing of aero-GaN fabricated by epitaxial growth on ZnO microtetrapods. The hybrid structures composed of aero-Ga2O3 functionalized with Au or Pt nanodots were tested for the photocatalytic degradation of methylene blue dye under UV or visible light illumination. The functionalization of aero-Ga2O3 with noble metals results in the enhancement of the photocatalytic performances of bare material, reaching the performances inherent to ZnO while gaining the advantage of the increased chemical stability. The mechanisms of enhancement of the photocatalytic properties by activating aero-Ga2O3 with noble metals are discussed to elucidate their potential for environmental applications.

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Adsorption and Photocatalytic Reduction of Carbon Dioxide on TiO2

Catalysts ◽

10.3390/catal11010047 ◽

2020 ◽

Vol 11 (1) ◽

pp. 47

Author(s):

Oleksandr Shtyka ◽

Viktar Shatsila ◽

Radoslaw Ciesielski ◽

Adam Kedziora ◽

Waldemar Maniukiewicz ◽

...

Keyword(s):

Photocatalytic Activity ◽

Active Sites ◽

High Efficiency ◽

Chemical Potential ◽

Band Gap Energy ◽

Electromagnetic Spectrum ◽

Reaction Intermediates ◽

Factors Affecting ◽

Phase Reduction ◽

Reduction Of Co2

The photocatalytic activity of TiO2 depends on numerous factors, such as the chemical potential of electrons, charge transport properties, band-gap energy, and concentration of surface-active sites. A lot of research has been dedicated to determining the properties that have the most significant influence on the photocatalytic activity of semiconductors. Here, we demonstrated that the activity of TiO2 in the gas-phase reduction of CO2 is governed mainly by the desorption rate of the reaction intermediates and final products. This indicates that the specific surface area of TiO2 and binding strength of reaction intermediates and products are the main factors affecting the photocatalytic activity of TiO2 in the investigated process. Additionally, it was shown that rutile exhibits higher photocatalytic activity than anatase/rutile mixtures mainly due to its high efficiency in the visible portion of the electromagnetic spectrum.

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A Bi7.38Cr0.62O12+x crystal as a novel visible-light-active photocatalyst up to ∼650 nm

RSC Advances ◽

10.1039/c7ra03058d ◽

2017 ◽

Vol 7 (46) ◽

pp. 28797-28801 ◽

Cited By ~ 2

Author(s):

W. X. Liao ◽

X. L. Zhao ◽

T. S. Wang

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Photoelectric Response ◽

Excellent Photocatalytic Activity ◽

Visible Light Active ◽

Type Semiconductor ◽

New Type ◽

P Type

A new type of Bi-based p-type semiconductor, Bi7.38Cr0.62O12+x, has a strong photoelectric response until 647.4 nm and an excellent photocatalytic activity for decomposition and O2 production.

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Fabrication of GO-TiO2/(Ca,Y)F2:Tm,Yb composites with high-efficiency optical driving photocatalytic activity for degradation of organic dyes and bacteriostasis

Rare Metals ◽

10.1007/s12598-021-01831-z ◽

2021 ◽

Author(s):

Hua Guo ◽

Jun Li ◽

Xian-Rui Zou ◽

Hong-Shui Wang ◽

An Kang ◽

...

Keyword(s):

Photocatalytic Activity ◽

High Efficiency ◽

Organic Dyes

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Innovative Low-Cost Carbon/ZnO Hybrid Materials with Enhanced Photocatalytic Activity towards Organic Pollutant Dyes’ Removal

Nanomaterials ◽

10.3390/nano10091873 ◽

2020 ◽

Vol 10 (9) ◽

pp. 1873

Author(s):

Petronela Pascariu ◽

Niculae Olaru ◽

Aurelian Rotaru ◽

Anton Airinei

Keyword(s):

Photocatalytic Activity ◽

Hybrid Materials ◽

Raw Materials ◽

Structural Characteristics ◽

Low Cost ◽

Organic Pollutant ◽

Zno Nanostructures ◽

Zno Nanocrystals ◽

Electrospinning Method ◽

New Type

A new type of material based on carbon/ZnO nanostructures that possesses both adsorption and photocatalytic properties was obtained in three stages: cellulose acetate butyrate (CAB) microfiber mats prepared by the electrospinning method, ZnO nanostructures growth by dipping and hydrothermal methods, and finally thermal calcination at 600 °C in N2 for 30 min. X-ray diffraction (XRD) confirmed the structural characteristics. It was found that ZnO possesses a hexagonal wurtzite crystalline structure. The ZnO nanocrystals with star-like and nanorod shapes were evidenced by scanning electron microscopy (SEM) measurements. A significant decrease in Eg value was found for carbon/ZnO hybrid materials (2.51 eV) as compared to ZnO nanostructures (3.21 eV). The photocatalytic activity was evaluated by studying the degradation of three dyes, Methylene Blue (MB), Rhodamine B (RhB) and Congo Red (CR) under visible-light irradiation. Therefore, the maximum color removal efficiency (both adsorption and photocatalytic processes) was: 97.97% of MB (C0 = 10 mg/L), 98.34% of RhB (C0 = 5 mg/L), and 91.93% of CR (C0 = 10 mg/L). Moreover, the value of the rate constant (k) was found to be 0.29 × 10−2 min−1. The novelty of this study relies on obtaining new photocatalysts based on carbon/ZnO using cheap and accessible raw materials, and low-cost preparation techniques.

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Enhancement of the photocatalytic activity of a TiO2/carbon aerogel based on a hydrophilic secondary pore structure

RSC Advances ◽

10.1039/c6ra08074j ◽

2016 ◽

Vol 6 (72) ◽

pp. 68416-68423 ◽

Cited By ~ 10

Author(s):

Hua'nan Cui ◽

Zhenxing Liang ◽

JinZhong Zhang ◽

Hong Liu ◽

Jianying Shi

Keyword(s):

Photocatalytic Activity ◽

Pore Structure ◽

High Efficiency ◽

Spatial Separation ◽

Carbon Aerogel ◽

Synergy Effect ◽

Photocatalytic Process ◽

Positive Role ◽

Potential Strategy ◽

Secondary Pore

The surface/interface synergy effect plays a positive role on the spatial separation and utilization of electrons and holes in photocatalytic process, which suggests a potential strategy for designing high efficiency photocatalysts.

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Parameters and design optimization of the ring piezoelectric ceramic transformer

Journal of Advanced Dielectrics ◽

10.1142/s2010135x15500228 ◽

2015 ◽

Vol 05 (03) ◽

pp. 1550022 ◽

Cited By ~ 4

Author(s):

Jiří Erhart

Keyword(s):

High Efficiency ◽

Strong Electric Field ◽

Resistive Load ◽

Optimum Load ◽

Aspect Ratios ◽

Transformation Ratio ◽

Ring Segment ◽

New Type ◽

Transformation Parameters ◽

Piezoelectric Ceramic Transformer

Main aim of the presented paper is the theoretical analysis and experimental verification of the transformation parameters for the new type of nonhomogeneously poled ring transformer. The input part is poled in the thickness direction and output part in the radial direction. Two transformer geometries are studied — the input part is at inner ring segment, or it is at the outer ring segment. The optimum electrode size aspect ratios have been found experimentally as [Formula: see text] for the ring with aspect ratio [Formula: see text]. The fundamental as well as higher overtone resonances were studied for the transformation ratio, the optimum resistive load, efficiency and no-load transformation ratio. Higher overtones have better transformation parameters compared to the fundamental resonance. The new type ring transformer exhibits very high transformation ratios up to 200 under no-load and up to 13.4 under a high efficiency of 97% at the optimum load conditions of 10 [Formula: see text]. Strong electric field gradient at the output circuit is applicable for the electrical discharge generation.

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A Design of New-Type Pipe Thread Forming Machine Based on Pro/E

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.628.497 ◽

2012 ◽

Vol 628 ◽

pp. 497-499

Author(s):

Mei Ling An ◽

Yan Gui Du

Keyword(s):

Small Volume ◽

Structural Model ◽

High Efficiency ◽

Design Tool ◽

Interference Detection ◽

Light Weight ◽

Physical Prototype ◽

New Type ◽

Movement Simulation

The pipe thread forming machine was innovatively designed in the article, using Pro/E as a design tool, we built the structural model of the pipe thread forming machine and performed interference detection and movement simulation for it, on the basis of this, we made a physical prototype. And our experiment showed the complete machine has the characteristics of high efficiency, tight structure, small volume and light weight, and it was easy to move.

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A New Type Component Mode Synthesis Beam Element Based on the Absolute Nodal Coordinate Formulation

Volume 5: 19th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C ◽

10.1115/detc2003/vib-48353 ◽

2003 ◽

Author(s):

Riki Iwai ◽

Nobuyuki Kobayashi

Keyword(s):

High Efficiency ◽

Absolute Nodal Coordinate Formulation ◽

Mass Matrix ◽

Synthesis Method ◽

Beam Element ◽

Component Mode Synthesis ◽

Flexible Beam ◽

Absolute Nodal Coordinate ◽

New Type ◽

The Absolute

This paper establishes a new type component mode synthesis method for a flexible beam element based on the absolute nodal coordinate formulation. The deformation of the beam element is defined as the sum of the global shape function and the analytical clamped-clamped beam modes. This formulation leads to a constant and symmetric mass matrix as the conventional absolute nodal coordinate formulation, and makes it possible to reduce the system coordinates of the beam structure which undergoes large rotations and large deformations. Numerical examples show that the excellent agreements are examined between the presented formulation and the conventional absolute nodal coordinate formulation. These results demonstrate that the presented formulation has high accuracy in the sense that the presented solutions are similar to the conventional ones with the less system coordinates and high efficiency in computation.

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