New Insights into Cd2+/Fe3+ Co-Doped BiOBr for Enhancing the Photocatalysis Efficiency of Dye Decomposition under Visible-Light

Uniform flowerlike microspheres Cd2+/Fe3+ co-doped BiOBr were prepared with the aid of the microwave hydrothermal process. The results indicate that the degradation performance of Bi1−xCdxOBr and Bi1−xFexOBr are 1.31 and 2.05 times that of BiOBr for RhB, respectively. Moreover, the novel Cd2+/Fe3+ co-doped BiOBr photocatalysts with ~0.42 eV impurity bands presented remarkably enhanced photocatalytic activities with being 3.10 times that of pure BiOBr, by achieving e−/h+ efficient separation and narrowed bandgap with the ions synergistic effect of Cd2+ and Fe3+. Based on DFT insights, the photodegradation mechanism was systematically studied that the conversion of multivalent Fe3+ ions promoted the production of •O2−, and Cd2+ ions worked as electron transfer mediators, which elucidated that the •O2− and h+VB mainly participated in the catalytic reaction. The experimental and theoretical results show that the synergistic effects of multi-ion doping have great potential in the field of photocatalysis.

Download Full-text

Synthesis of V-modified TiO2 nanorod-aggregates by a facile microwave-assisted hydrothermal process and photocatalytic degradation towards PCP-Na under solar light

RSC Advances ◽

10.1039/c9ra05480d ◽

2019 ◽

Vol 9 (60) ◽

pp. 34862-34871 ◽

Cited By ~ 2

Author(s):

Rong Han ◽

Jinwen Liu ◽

Nan Chen ◽

Gang Wang ◽

Yakai Guo ◽

...

Keyword(s):

Solar Activity ◽

Photocatalytic Degradation ◽

Synergistic Effects ◽

Hydrothermal Process ◽

Red Shift ◽

Solar Light ◽

Hydrothermal Route ◽

Charge Migration ◽

Microwave Assisted ◽

Microwave Hydrothermal

V-modified titania nanorod-aggregates were fabricated by microwave hydrothermal route. MWV05 exhibited optimal solar activity towards PCP-Na, due to red-shift by V-doping, carriers separation by V4+/V5+ synergistic effects and charge migration along the nanorods.

Download Full-text

Manganese and Graphene Included Titanium Dioxide Composite Nanowires: Fabrication, Characterization and Enhanced Photocatalytic Activities

Nanomaterials ◽

10.3390/nano10030456 ◽

2020 ◽

Vol 10 (3) ◽

pp. 456 ◽

Cited By ~ 6

Author(s):

Jun-Cheol Lee ◽

Anantha-Iyengar Gopalan ◽

Gopalan Saianand ◽

Kwang-Pill Lee ◽

Wha-Jung Kim

Keyword(s):

Raman Spectroscopy ◽

Titanium Dioxide ◽

Photoelectron Spectroscopy ◽

Diffuse Reflectance Spectroscopy ◽

Synergistic Effects ◽

Photocatalytic Property ◽

Rutile Phase ◽

X Ray ◽

Photocatalytic Activities ◽

Co Doped

We report the detailed microstructural, morphological, optical and photocatalytic studies of graphene (G) and manganese (Mn) co-doped titanium dioxide nanowires (TiO2(G–Mn) NWs) prepared through facile combined electrospinning–hydrothermal processes. The as-prepared samples were thoroughly characterized using X-ray diffraction (XRD), transmission electron microscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and diffuse reflectance spectroscopy (DRS). XRD studies reveal the formation of mixed anatase-rutile phases or rutile phase depending on the dopant (Mn) precursor concentrations in the electrospinning dope and calcination temperature. The evaluation of lattice parameters revealed that the incorporation of Mn species and carbon atoms in to the lattice of anatase or rutile TiO2 could occur through substituting the sites of oxygen atoms. XPS results confirm the existence of Mn2+/Mn3+ within the TiO2 NW. Raman spectroscopy provides the evidence for structural modification because of the graphene inclusion in TiO2 NW. The optical band gap of G–Mn including TiO2 is much lower than pristine TiO2 as confirmed through UV-vis DRS. The photocatalytic activities were evaluated by nitric oxide (NOx) degradation tests under visible light irradiation. Superior catalytic activity was witnessed for rutile G–Mn-co-doped TiO2 NW over their anatase counterparts. The enhanced photocatalytic property was discussed based on the synergistic effects of doped G and Mn atoms and explained by plausible mechanisms.

Download Full-text

Synthesis of Nanoflower Precursors in Two-Phase System via Microwave-Assisted Hydrothermal Method and their In Situ Thermal Convention to NiO

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.20.43 ◽

2012 ◽

Vol 20 ◽

pp. 43-52 ◽

Cited By ~ 2

Author(s):

Yan Bin Zhang ◽

Zhen Feng Zhu ◽

Wen Jia Zhang ◽

Yan Li Zhang ◽

Hui Liu ◽

...

Keyword(s):

Electron Microscopy ◽

Hydrothermal Process ◽

Phase System ◽

The Novel ◽

X Ray Diffraction ◽

Two Phase ◽

Microwave Hydrothermal ◽

Transmission Electron ◽

Average Size

The novel nanoflower precursors were successfully fabricated via microwave hydrothermal process in the presence of an anion surfactant Poly (N-vinyl-2-pyrrolidone). Nickel oxide (NiO) with the similar morphology of precursors was also obtained by a simple thermal decomposition of the as-prepared precursors at 400 °C for 2 h in air. The products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Fourier transform infrared spectroscopy. The synthesized NiO nanoclusters have a cubic structure with an average size 500-1000 nm. The specific capacitance of NiO is about 208.4 F/g.

Download Full-text

Influences of Reaction Temperature on Structure and Performances of SnO2 Nanocrystals Prepared by Microwave Hydrothermal Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.809-810.122 ◽

2014 ◽

Vol 809-810 ◽

pp. 122-127 ◽

Cited By ~ 3

Author(s):

Li Xiong Yin ◽

Fei Fei Wang ◽

Jian Feng Huang ◽

Dan Wang ◽

Jia Yin Li

Keyword(s):

Electron Microscope ◽

Reaction Temperature ◽

Hydrothermal Reaction ◽

Raw Materials ◽

Hydrothermal Process ◽

X Ray Diffraction ◽

X Ray ◽

Microwave Hydrothermal ◽

Transmission Electron ◽

Photocatalytic Activities

SnO2nanocrystals were synthesized using SnCl4•5H2O and NH3•H2O as the main raw materials and distilled water as the solvent by microwave hydrothermal. Reaction temperature on the structure and photocatalytic activities of the SnO2nanocrystals by microwave hydrothermal process was studied. The phase composition, morphologies and photocatalytic activities of the product were characterized by XRD (X-ray diffraction), SEM (scanning electron microscope), TEM (transmission electron microscope) and photochemical reaction instrument. Results show the crystalline and conglobation of the product have significant effect on its photocatalytic properties. The homogeneous low-agglomerated and well crystallined SnO2nanocrystals prepared at 180 °C has good photocatalytic activities during photocatalytic degradation of RhB process.

Download Full-text

Tunable Carbon Surface from Mono- to Multi-Metallic Single Atoms

10.26434/chemrxiv.12264083 ◽

2020 ◽

Author(s):

Weihong Lai ◽

Heng Wang ◽

Quan jiang ◽

Zichao Yan ◽

Hanwen Liu ◽

...

Keyword(s):

Synergistic Effects ◽

Structural Evolution ◽

Charge Compensation ◽

Catalytic Reactions ◽

Single Atom ◽

Carbon Surface ◽

Hydrogen Electrode ◽

Single Atoms ◽

Mass Activity ◽

Co Doped

Herein, we develop a non-selective charge compensation strategy to prepare multi-single-atom doped carbon (MSAC) in which a sodium p-toluenesulfonate (PTS-Na) doped polypyrrole (S-PPy) polymer is designed to anchor discretionary mixtures of multiple metal cations, including iron (Fe3+), cobalt (Co3+), ruthenium (Ru3+), palladium (Pd2+), indium (In3+), iridium (Ir2+), and platinum (Pt2+) . As illustrated in Figure 1, the carbon surface can be tuned with different level of compositional complexities, including unary Pt1@NC, binary (MSAC-2, (PtFe)1@NC), ternary (MSAC-3, (PtFeIr)1@NC), quaternary (MSAC-4, (PtFeIrRu)1@NC), quinary (MSAC-5, (PtFeIrRuCo)1@NC), senary (MSAC-6, (PtFeIrRuCoPd)1@NC), and septenary (MSAC-7, (PtFeIrRuCoPdIn)1@NC) samples. The structural evolution of carbon surface dictates the activities of both ORR and HER. The senary MSAC-6 achieves the ORR mass activity of 18.1 A·mgmetal-1 at 0.9 V (Vs reversible hydrogen electrode (RHE)) over 30K cycles, which is 164 times higher than that of commercial Pt/C. The quaternary MSAC-4 presented a comparable HER catalytic capability with that of Pt/C. These results indicate that the highly complexed carbon surface can enhance its ability over general electrochemical catalytic reactions. The mechanisms regarding of the ORR and HER activities of the alternated carbon surface are also theoretically and experimentally investigated in this work, showing that the synergistic effects amongst the co-doped atoms can activate or inactivate certain single-atom sites.

Download Full-text

Photocatalytic activities of hollow and hierarchical Bi3.15Nd0.85Ti3O12 microspheres synthesized through a hydrothermal process

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-009-9950-z ◽

2009 ◽

Vol 21 (5) ◽

pp. 523-528 ◽

Cited By ~ 8

Author(s):

Zhizheng Wang ◽

Yajun Qi ◽

Hongyan Qi ◽

Chaojing Lu ◽

Shimin Wang

Keyword(s):

Hydrothermal Process ◽

Photocatalytic Activities

Download Full-text

Catalytic performance of iron-mesoporous nanomaterials synthesized by a microwave-hydrothermal process

Reaction Kinetics Mechanisms and Catalysis ◽

10.1007/s11144-010-0175-1 ◽

2010 ◽

Author(s):

K. Bachari ◽

R. M. Guerroudj ◽

M. Lamouchi

Keyword(s):

Hydrothermal Process ◽

Catalytic Performance ◽

Microwave Hydrothermal

Download Full-text

Electromagnetic Wave Shieding Effectiveness of Carbon Fiber Sheet Coated Ferrite Film by Microwave-Hydrothermal Process

International Journal of Modern Physics B ◽

10.1142/s0217979203018806 ◽

2003 ◽

Vol 17 (08n09) ◽

pp. 1235-1241 ◽

Cited By ~ 3

Author(s):

Ri Ichi Murakami ◽

Hidetoshi Yamamoto ◽

Chan Kong Kim ◽

Cheol Mun Yim ◽

Yun Hae Kim

Keyword(s):

Electromagnetic Wave ◽

Carbon Fiber ◽

Wireless Lan ◽

Hydrothermal Process ◽

Ferrite Film ◽

Shielding Effectiveness ◽

Microwave Hydrothermal ◽

Fiber Sheet ◽

Coated Carbon ◽

Carbon Fiber Sheet

The developments of electromagnetic wave shielding materials are strongly required because the malfunction of electronic equipment, mobile phone and wireless LAN avoids. In this study, it was investigated that the electromagnetic shielding effectiveness of carbon fiber sheets were enhanced by the ferrite which was coated by the microwave hydrothermal process. For coated carbon fiber sheet, the effects of ferrite and lamination of carbon fiber textile on the electromagnetic wave shielding effectiveness were discussed. In the range of frequency (100 – 1 GHz), the electromagnetic wave shielding effectiveness was measured by using TEM-Cell. The electromagnetic wave shielding effectiveness was greater for the coated carbon fiber sheets than for the uncoated carbon fiber sheets. When the insulation film was located between two carbon fiber sheets, the electromagnetic wave shielding effectiveness increased.

Download Full-text