Electrospun Zn Doped CuFe2O4 Nanofibers with Enhanced Photo Fenton-Like Catalytic Activity

2021 ◽  
Vol 21 (3) ◽  
pp. 1517-1525
Author(s):  
Yongping Cui ◽  
Yaru Shang ◽  
Xiaohu Cheng ◽  
Ruixia Shi ◽  
Ping Yang
Keyword(s):  
Catalytic Activity ◽  
Catalytic Mechanism ◽  
Spinel Ferrite ◽  
Degradation Efficiency ◽  
X Ray Diffraction ◽  
Step Method ◽  
Uniform Size ◽  
Zn Content ◽  
Electrospinning Method ◽  
One Step

One dimensional Zn doped CuFe2O4 spinel ferrite nanofibers were successfully prepared via a facile electrospinning method followed by two different calcination routes. The results showed that the as-prepared nanofibers through two-step calcination exhibited more uniform size distribution in diameter compared with those calcined by one-step method. X-ray diffraction (XRD) results indicated that with the increase of Zn content the position of diffraction peaks of Zn doped CuFe2O4 slightly shift towards lower 2θ angle because the ionic sizes of the Zn2+ (0.74 Å) is larger than that of Cu2+ (0.69 Å). Fourier transform infrared spectroscopy (FTIR) results showed that with increasing Zn content the position of vibrational band (590 cm−1) shifted towards the smaller wavenumber. Generally, photo-generated carriers increased with the increasing of Zn content. The photo Fenton-like catalytic results revealed that the doping of Zn facilitated the enhancement of degradation efficiency of catalysts. Additionally, 10 at.% Zn doped CuFe2O4 exhibited the best photo Fenton-like catalytic activity and the degradation efficiency of Rhodamine B (RhB) could reach 100% in 40 min. Finally, the enhancement of photo Fenton-like catalytic mechanism of the Zn doped CuFe2O4 nanofibers was mainly attributed to actived spinel structure lattice by Zn doping, which allows more Cu2+ and Fe3+ ions are involved in the photo Fenton-like catalytic reaction.

Preparation of porphyrin modified CO9S8 nanocomposites and application for colorimetric biosensing of H2O2

2018 ◽  
Vol 22 (09n10) ◽  
pp. 935-943 ◽  
Author(s):  
Yan Gao ◽  
Chunqiao Jin ◽  
Miaomiao Chen ◽  
Xixi Zhu ◽  
Min Fu ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Peroxidase Activity ◽  
Catalytic Mechanism ◽  
Color Change ◽  
Colorimetric Detection ◽  
Buffer Solution ◽  
Hydrogen Peroxide Detection ◽  
Steady State Kinetics ◽  
One Step

Hydrogen peroxide detection has been widely applied in the fields of biology, medicine, and chemistry. Colorimetric detection of hydrogen peroxide has proven to be a fast and convenient method. In this work, 5,10,15,20-tetrakis(4-chlorophenyl) porphyrin modified Co[Formula: see text]S[Formula: see text] nanocomposites (H[Formula: see text]TClPP-Co[Formula: see text]S[Formula: see text] were prepared via a facile one-step hydrothermal method. H[Formula: see text]TClPP-Co[Formula: see text]S[Formula: see text] nanocomposites were demonstrated to possess an enhanced mimetic peroxidase activity toward the substrate, 3,3[Formula: see text],5,5[Formula: see text]-tetramethylbenzidine (TMB), which can be oxidized to oxTMB (oxidized TMB) in a buffer solution of hydrogen peroxide with a color change from colorless to blue. The catalytic activity of H[Formula: see text]TClPP-Co[Formula: see text]S[Formula: see text] was further analyzed by steady-state kinetics, and H[Formula: see text]TClPP-Co[Formula: see text]S[Formula: see text] had high affinity towards both TMB and H[Formula: see text]O[Formula: see text]. Furthermore, fluorescence and ESR data revealed that the catalytic mechanism of the peroxidase activity of H[Formula: see text]TClPP-Co[Formula: see text]S[Formula: see text] is due to hydroxyl radicals generated from decomposition of H[Formula: see text]O[Formula: see text]. Based on the catalytic activity of H[Formula: see text]TClPP-Co[Formula: see text]S[Formula: see text], a sensitive colorimetric sensor of H[Formula: see text]O[Formula: see text] with a detection limit of 6.803 [Formula: see text]M as well as a range of 7–100 [Formula: see text]M was designed.

Preparation of PdxAuy bimetallic nanostructures with controllable morphologies supported on reduced graphene oxide nanosheets and wrapped in a polypyrrole layer

RSC Advances ◽  
2015 ◽  
Vol 5 (107) ◽  
pp. 87831-87837 ◽  
Author(s):  
Tongjie Yao ◽  
Quan Zuo ◽  
Hao Wang ◽  
Jie Wu ◽  
Xiao Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Reduced Graphene Oxide ◽  
Graphene Oxide Nanosheets ◽  
Step Method ◽  
Reduced Graphene ◽  
One Step ◽  
Good Catalytic Activity ◽  
Alloy Nanostructures ◽  
Bimetallic Nanostructures

A one-step method to prepare reduced graphene oxide/PdxAuy/polypyrrole composites with good catalytic activity was introduced. The morphologies of alloy nanostructures could turn to be spherical, coral-like and porous cluster-like.

Rheology and Heat Treatment of Zirconia Based Gels Synthesized from Sodium Glycozirconate Precursor

2005 ◽  
Vol 480-481 ◽  
pp. 549-556 ◽  
Author(s):  
Bussarin Ksapabutr ◽  
Erdogan Gulari ◽  
Sujitra Wongkasemjit
Keyword(s):  
Sol Gel ◽  
Gelation Time ◽  
X Ray Diffraction ◽  
Step Method ◽  
Storage And Loss Moduli ◽  
One Step ◽  
Sol Gel Transition ◽  
Bet Technique ◽  
The One ◽  
Kinetics Of

Zirconia based gels were prepared by the sol-gel route using sodium tris(glycozirconate)complex as precursor synthesized directly from the reaction of inexpensive and readily available compounds via the one step method. Rheological technique was used to investigate the sol-gel transition of zirconium based materials at different water/alkoxide ratios and reaction temperatures. The gelation time was determined from the evolution of the storage and loss moduli versus time at various frequencies using the Winter-Chambon criterion. The effect of an increase of the hydrolysis ratio and /or temperature was an enhancement of the kinetics of crosslink reactions, thus decreasing the gelation time. The variation of the gelation time versus temperature could be described by Arrhenius law. Furthermore, zirconia powders prepared from the thermal treatment at 500°C were analyzed by X-ray diffraction and the BET technique.

Preparation, Characterization of Phosphorus Doped Titania Photocatalysts with High Photocatalystic Properties

2010 ◽  
Vol 113-116 ◽  
pp. 2154-2157 ◽  
Author(s):  
Si Yao Guo ◽  
Jin Bing Sun ◽  
Feng Lu Wang ◽  
Lin Yang ◽  
Feng Zhang ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Titania Nanoparticles ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Step Method ◽  
X Ray ◽  
One Step ◽  
Titania Photocatalyst ◽  
Calcination Method ◽  
Doped Titania

Phosphor-doped titania nanoparticles were synthesized by a one step method, which were prepared by conventional calcination method. These samples have much higher photocatalytic activity for methylene blue degradation. The resulting materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), etc. Moreover, we use high P/TiO2 molar ratio to get the most suitable proportion for the synthesis of P-doped titania photocatalyst.

DUMBBELL-SHAPED ZnO NANORODS: GROWTH AND CHARACTERIZATION

2011 ◽  
Vol 10 (01n02) ◽  
pp. 87-92 ◽  
Author(s):  
N. RAJKUMAR ◽  
M. PRABHU ◽  
K. RAMACHANDRAN
Keyword(s):  
Electron Microscopy ◽  
Large Scale ◽  
Zno Nanorods ◽  
Growth Direction ◽  
Hexagonal Structure ◽  
X Ray Diffraction ◽  
Step Method ◽  
Structural Morphology ◽  
Transmission Electron ◽  
One Step

A novel one-step method to synthesize large-scale uniform dumbbell-shaped ZnO nanorods is presented here. The structural morphology was investigated by using X-ray diffraction, scanning electron microscopy, and high-resolution transmission electron microscopy analyses. The prepared dumbbells with diameter of 300 nm and length of 1.5 μm possess hexagonal structure with preferable [001] growth direction. The UV–vis absorption spectra show blueshift for smaller nanoparticles and redshift for bigger dumbbell-shaped ZnO nanorods.

scholarly journals Microstructure and Interface Characteristics of 17-4PH/YSZ Components after Co-Sintering and Hydrothermal Corrosion

Ceramics ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 245-257 ◽  
Author(s):  
Anne Günther ◽  
Tassilo Moritz ◽  
Uwe Mühle
Keyword(s):  
Stainless Steel ◽  
Tape Casting ◽  
X Ray Diffraction ◽  
Step Method ◽  
X Ray ◽  
Hybrid Parts ◽  
Interface Characteristics ◽  
Chemical Constitution ◽  
Metal Ceramic ◽  
One Step

Combining stainless steel with zirconia components by powder technological shaping routes for manufacturing of multifunctional parts is an advantageous and promising one-step method making expensive and time-consuming additional joining steps redundant. However, several requirements for co-shaping and co-sintering of the very different compound partners have to be met. The microstructural and chemical constitution of the interface between both materials plays an important role for the mechanical properties, durability and corrosion resistance of the manufactured parts. In the present study, different shaping techniques for co-shaping of stainless steel and zirconia are introduced. The microstructure and the interphase properties of metal/ceramic hybrid parts have been investigated for samples made by tape casting, subsequent lamination and co-sintering. Nevertheless, the results of this study are valid for components made by other hybrid shaping processes as well. The interfaces were characterized by TEM, FESEM, EDX, and X-ray diffraction. Furthermore, the hydrothermal stability of the material compound was investigated.

scholarly journals Ion-Exchanged ZIF-67 Synthesized by One-Step Method for Enhancement of CO2 Adsorption

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Fujiao Song ◽  
Yan Cao ◽  
Yunxia Zhao ◽  
Ruiyu Jiang ◽  
Qi Xu ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Physical Adsorption ◽  
Point Of Zero Charge ◽  
X Ray Diffraction ◽  
Step Method ◽  
Adsorption Performance ◽  
Particle Size Analyzer ◽  
One Step ◽  
The One ◽  
Electronic Microscope

Li+- and Na+-exchanged ZIF-67 was synthesized by a new one-step method of ion as-exchange technique and tested as CO2 adsorbents. As a comparison, the standard ion-exchange procedure was also carried out. The powder X-ray diffraction (XRD), scanning electronic microscope (SEM), particle size analyzer (PSD), and thermal gravimetry analysis (TGA) were used to investigate the effect of ion-exchange techniques on the structure of the materials. CO2 uptake of ZIF-67 ion exchanged by one-step method is much higher than that by the standard ion-exchange procedure. All of the adsorption isotherms show linear patterns with stable adsorption rate from 0 bar to 1 bar, which reveals the materials could get excellent adsorption performance at higher pressure range (>1 bar). Elemental analysis, N2 physical adsorption, and the point of zero charge (PZC) were carried out to confirm the adsorption mechanism. van der Waals interaction determined by the surface area and coordination interaction resulting from electrostatic interaction work in synergy to enhance CO2 adsorption performance of ZIF-67 ion exchanged by the one-step method.

scholarly journals One-step preparation of metal-free phthalocyanine with controllable crystal form

2021 ◽  
Vol 10 (1) ◽  
pp. 95-100
Author(s):  
Xiaolong Li ◽  
Yuxi Feng ◽  
Chenyang Li ◽  
Huahui Han ◽  
Xueqing Hu ◽  
...  
Keyword(s):  
Ball Milling ◽  
Crystal Form ◽  
Milling Process ◽  
X Ray Diffraction ◽  
Step Method ◽  
Metal Free ◽  
Crystal Stability ◽  
Organic Optoelectronics ◽  
Different Temperatures ◽  
One Step

Abstract Metal-free phthalocyanine (H2Pc) has been widely used as photosensitive semiconductors in the organic optoelectronics field because of its unique planar molecular structure and high photocarriers’ generation efficiency. Herein, this paper related to a new facile and efficient one-step method for preparing specific crystal form of H2Pc with high crystallinity through ball-milling process, in which α-H2Pc can be prepared directly by dry ball-milling, and β-H2Pc and X-H2Pc can be simply obtained through wet ball-milling in butanone solvent at different temperatures. X-ray diffraction (XRD) was used to characterize the crystal stability of α-H2Pc, β-H2Pc, and X-H2Pc, which revealed that all the three crystalline H2Pc prepared had excellent crystal stability under different mechanical conditions.

scholarly journals Synthesis of conical Co–Fe alloys structures obtained with crystal modifier in superimposed magnetic field

2021 ◽  
Vol 21 (4) ◽  
Author(s):  
Katarzyna Skibińska ◽  
Dawid Kutyła ◽  
Karolina Kołczyk-Siedlecka ◽  
Mateusz M. Marzec ◽  
Piotr Żabiński ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Photoelectron Spectroscopy ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Step Method ◽  
X Ray ◽  
One Step ◽  
Fe Alloys ◽  
The Magnetic Field ◽  
Conical Structures

AbstractThe addition of crystal modifier to electrolyte used during electrodeposition of metals and alloys allows obtaining conical structures without using any template. This method is fast and ensures covering large areas during one single electrodeposition process. In this work, Co–Fe cones were obtained by one-step method with ammonium chloride as a crystal modifier. The influence of electrodeposition parameters and electrolyte compositions were investigated. Electrodeposition conditions (duration, electrolyte temperature, and addition of NH4Cl), which allow obtaining the most uniform conical structures, were applied during sample fabrication in the magnetic field. The influence of its value and direction on the quality and compositions of obtained alloys was investigated using Scanning Electron Microscope (SEM) photos. To check if there is any change in the sample crystal system, the X-Ray Diffraction (XRD) analysis was performed. To confirm the synthesis of Co–Fe cones, they were analyzed using the X-ray photoelectron Spectroscopy (XPS) method.

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