Synthesis of Au@UiO-66(NH2) structures by small molecule-assisted nucleation for plasmon-enhanced photocatalytic activity

2016 ◽  
Vol 52 (1) ◽  
pp. 116-119 ◽  
Author(s):  
Zhizhi Gu ◽  
Liyong Chen ◽  
Binhua Duan ◽  
Qiong Luo ◽  
Jing Liu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Acetic Acid ◽  
Photocatalytic Activity ◽  
Electronic State ◽  
Small Molecule ◽  
Alcohol Oxidation ◽  
Core Shell ◽  
Au Nps ◽  
Encapsulation Process ◽  
Lumo Level

Au@UiO-66(NH2) core/shell heterostructures were synthesized via an acetic acid/carbon dioxide-assisted solution-encapsulation process. Excited electrons, produced by photo-adsorption of UiO-66(NH2) and plasmonic sensitization with Au NPs, at the LUMO level with a localized electronic state were transferred to O2 for the enhancement of photocatalytic activity of alcohol oxidation.

scholarly journals ETS-10 as a photocatalyst

2003 ◽  
Vol 5 (3) ◽  
pp. 131-140 ◽  
Author(s):  
Yuni K. Krisnandi ◽  
Peter D. Southon ◽  
Asoji A. Adesina ◽  
Russell F. Howe
Keyword(s):  
Carbon Dioxide ◽  
Acetic Acid ◽  
Photocatalytic Activity ◽  
Partial Oxidation ◽  
Complete Oxidation ◽  
Novel Material ◽  
Free Material ◽  
Microporous Titanosilicate

ETS-10 is a microporous titanosilicate zeolite with a framework containing linear Ti- O -Ti- O- chains. This paper describes an investigation of the photoreactivity of ETS-10 with the particular objective of evaluating the potential of this novel material as a zeolitic photocatalyst. The photoreactivity and photocatalytic activity of ETS-10 are strongly influenced by defects in the structure. A relatively defect free material catalyses photo-polymerisation of ethene, and in the presence of oxygen catalyses the partial oxidation of ethene to acetic acid and acetaldehyde, which remain strongly adsorbed in the pores. A more defective material is photoreduced when irradiated in the presence of adsorbed ethene, and catalyses the complete oxidation of ethene to carbon dioxide and water in the presence of oxygen. These differences are attributed to differences in the concentrations of exposed titanium sites associated with defects in the ETS-10 structure.

Synthesis of Au@MoS2-CdS Ternary Composite Structure with Enhanced Photocatalytic Activity

NANO ◽  
2019 ◽  
Vol 14 (09) ◽  
pp. 1950114 ◽  
Author(s):  
Zhe Liu ◽  
Liwei Wang ◽  
Ruoping Li ◽  
Mingju Huang
Keyword(s):  
Photocatalytic Activity ◽  
Composite Structure ◽  
Shell Structure ◽  
Synthesis Method ◽  
Absorption Enhancement ◽  
Core Shell ◽  
Ternary Composite ◽  
Au Nps ◽  
Seed Growth ◽  
Core Shell Structure

Au@MoS2-CdS, as ternary composite structure, was successfully synthesized by a facile process combining hydrothermal and seed-growth methods. The introduction of Au nanoparticles (NPs) into MoS2 spheres, forming a core–shell structure, demonstrates strong plasmonic absorption enhancement. The incorporation of CdS NPs into the Au@MoS2 core–shell structure further extends the absorption range of visible light and enhances exciton dissociation. The resultant composite structure exhibits the highest photocatalytic activity in photocatalytic degradation of rhodamine B (RhB) solution, compared with Au NPs, MoS2 spheres, Au@MoS2 core–shell and MoS2-CdS heterostructures. The above phenomena are supported by a series of characterization results such as SEM, TEM, XRD, EDS and UV-Vis, etc. Based on structural and morphological analyses, we propose the synthesis method of ternary composite structure photocatalysts, which is helpful for the synthesis of future multicomponent photocatalytic materials.

Tuning the Photocatalytic Performance of Plasmonic Nanocomposites (ZnO/Aux) Driven in Visible Light

2019 ◽  
Vol 8 (1) ◽  
pp. 56-61
Author(s):  
Aneeya K. Samantara ◽  
Debasrita Dash ◽  
Dipti L. Bhuyan ◽  
Namita Dalai ◽  
Bijayalaxmi Jena
Keyword(s):  
Electron Transfer ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Transfer Rate ◽  
Photocatalytic Performance ◽  
Light Exposure ◽  
Au Nanoparticle ◽  
Electron Transfer Rate ◽  
Au Nps ◽  
Zno Nanostructure

: In this article, we explored the possibility of controlling the reactivity of ZnO nanostructures by modifying its surface with gold nanoparticles (Au NPs). By varying the concentration of Au with different wt% (x = 0.01, 0.05, 0.08, 1 and 2), we have synthesized a series of (ZnO/Aux) nanocomposites (NCs). A thorough investigation of the photocatalytic performance of different wt% of Au NPs on ZnO nanosurface has been carried out. It was observed that ZnO/Au0.08 nanocomposite showed the highest photocatalytic activity among all concentrations of Au on the ZnO surface, which degrades the dye concentration within 2 minutes of visible light exposure. It was further revealed that with an increase in the size of plasmonic nanoparticles beyond 0.08%, the accessible surface area of the Au nanoparticle decreases. The photon absorption capacity of Au nanoparticle decreases beyond 0.08% resulting in a decrease in electron transfer rate from Au to ZnO and a decrease of photocatalytic activity. Background: Due to the industrialization process, most of the toxic materials go into the water bodies, affecting the water and our ecological system. The conventional techniques to remove dyes are expensive and inefficient. Recently, heterogeneous semiconductor materials like TiO2 and ZnO have been regarded as potential candidates for the removal of dye from the water system. Objective: To investigate the photocatalytic performance of different wt% of Au NPs on ZnO nanosurface and the effect of the size of Au NPs for photocatalytic performance in the degradation process. Methods: A facile microwave method has been adopted for the synthesis of ZnO nanostructure followed by a reduction of gold salt in the presence of ZnO nanostructure to form the composite. Results: ZnO/Au0.08 nanocomposite showed the highest photocatalytic activity which degrades the dye concentration within 2 minutes of visible light exposure. The schematic mechanism of electron transfer rate was discussed. Conclusion: Raspberry shaped ZnO nanoparticles modified with different percentages of Au NPs showed good photocatalytic behavior in the degradation of dye molecules. The synergetic effect of unique morphology of ZnO and well anchored Au nanostructures plays a crucial role.

scholarly journals Surface plasmon-driven photocatalytic activity of Ni@NiO/NiCO3 core–shell nanostructures

RSC Advances ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 2733-2743
Author(s):  
Parisa Talebi ◽  
Harishchandra Singh ◽  
Ekta Rani ◽  
Marko Huttula ◽  
Wei Cao
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Surface Plasmon ◽  
Core Shell ◽  
Plasmonic Resonance ◽  
Surface Plasmonic Resonance ◽  
Shell Nanostructures

Surface plasmonic resonance enabled Ni@NiO/NiCO3 core–shell nanostructures as promising photocatalysts for hydrogen evolution under visible light.

A core–shell structured magnetic Ag/AgBr@Fe2O3 composite with enhanced photocatalytic activity for organic pollutant degradation and antibacterium

RSC Advances ◽  
2015 ◽  
Vol 5 (87) ◽  
pp. 71035-71045 ◽  
Author(s):  
Shuquan Huang ◽  
Yuanguo Xu ◽  
Zhigang Chen ◽  
Meng Xie ◽  
Hui Xu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Photocatalytic Activity ◽  
Organic Pollutant ◽  
Core Shell ◽  
Pollutant Degradation ◽  
Antibacterial Ability ◽  
Highly Efficient ◽  
Organic Pollutant Degradation

A core–shell structured Ag/AgBr@Fe2O3 composite was prepared successfully. It has magnetic properties, highly efficient photocatalytic activity and antibacterial ability.

scholarly journals The flame spectrum of carbon monoxide

1940 ◽  
Vol 176 (967) ◽  
pp. 505-521 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Electronic State ◽  
Excited Electronic State ◽  
Combustion Process ◽  
Wave Number ◽  
Band Spectrum ◽  
Liquid Form ◽  
Triangular Form ◽  
Reduced Pressure

The spectrum of the flame of carbon monoxide burning in air and in oxygen at reduced pressure has been photographed on plates of high contrast which display the band spectrum clearly above the continuous background. Greater detail has been obtained than has been recorded previously and new measurements are given. The structure of the spectrum has been studied systematically. It is shown that the bands occur in pairs with a separation of about 60 cm. -1 , this separation being due probably to the rotational structure. Various wave-number differences are found to occur frequently, and many of the strong bands are arranged in arrays using intervals of 565 and 2065 cm. -1 . The possible origin of the spectrum is discussed. The choice of emitter is limited to a polyatomic oxide of carbon, of which carbon dioxide is the most likely. The spectrum of the suboxide C 3 O 2 shows some resemblance to the flame bands, but this molecule is improbable as the emitter on other grounds. A peroxide C0 3 is also a possibility, but no evidence for the presence of this has been obtained from experiments on the slow combustion of carbon monoxide. Carbon dioxide in gaseous or liquid form is transparent through the visible and quartz ultra-violet, and the flame bands are not obtained from CO 2 in discharge tubes. Comparison with the Schumann-Runge bands of oxygen shows that it is possible that the flame bands may form part of the absorption band system of CO 2 which is known to exist below 1700 A if there is a big change in shape or size of the molecule in the two electronic states. The electronic energy levels of CO 2 are discussed. Since normal CO 2 is not built up from normal CO and oxygen, an electronic rearrangement of the CO 2 must occur after the combustion process. Mulliken has suggested that the molecule in the first excited electronic state, corresponding to absorption below 1700 A, may have a triangular form. The frequencies obtained from the flame bands are compared with the infra-red frequencies of CO 2 . The 565 interval may be identified with the transverse vibration v 2 , indicating that the excited electronic state is probably triangular in shape. The 2065 interval cannot, however, be identified with the asymmetric vibration v 3 with any certainty. If the excited electronic state of CO 2 is triangular, then molecules formed during the combustion by transitions from this level to the ground state may be “vibrationally activated”. This is probably the reason for many of the peculiarities of the combustion of carbon monoxide.

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