Mechanistic insights into the photocatalytic properties of metal nanocluster/graphene ensembles. Examining the role of visible light in the reduction of 4-nitrophenol

Nanoscale ◽  
2017 ◽  
Vol 9 (27) ◽  
pp. 9685-9692 ◽  
Author(s):  
Malamatenia A. Koklioti ◽  
Theodosis Skaltsas ◽  
Yuta Sato ◽  
Kazu Suenaga ◽  
Anastasios Stergiou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Photocatalytic Properties ◽  
High Catalytic Activity ◽  
Metal Nanocluster

The high catalytic activity of AuNCs/f-G for the reduction of 4-nitrophenol under visible light is ascribed to three synergistic mechanisms.

Role of microporous Janus silica nanosheets in the assembly of ultra-small Ag nanoparticles with high catalytic activity

2021 ◽  
Vol 50 (1) ◽  
pp. 208-216
Author(s):  
Mengnan Yang ◽  
Zhaoli Yan ◽  
Tiantian Li ◽  
Bing Liu ◽  
Qiangshan Jing ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ag Nanoparticles ◽  
High Catalytic Activity ◽  
Charged Surface ◽  
Highly Efficient ◽  
Surface Hydroxyls

Negatively charged surface hydroxyls and micropores of Janus silica nanosheets play a particular role in the highly efficient and dispersed assembly of ultra-small Ag nanoparticles with high catalytic activity.

Investigation of ZnO/CuO/Nanographene Platelets Composites Catalyst for the Degradation of Methylene Blue from Aqueous Solution

2016 ◽  
Vol 864 ◽  
pp. 117-122 ◽  
Author(s):  
Hesni Shabrany ◽  
Hendry Tju ◽  
Ardiansyah Taufik ◽  
Rosari Saleh
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Catalytic Activity ◽  
Visible Light ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Ultrasound Irradiation ◽  
X Ray Diffraction ◽  
X Ray

This paper discusses the catalytic activity of ZnO/CuO/nanographene platelets composites under visible light and ultrasound irradiation separately. The ZnO/CuO/nanographene platelets composites were synthesized using a sol-gel method. X-ray diffraction and nitrogen adsorption spectroscopy were employed to investigate the structural and surface area of the catalyst. The catalytic activity results showed that the presence of nanographene platelets in ZnO/CuO nanocomposites improved its efficiency in degrading methylene blue. A scavenger method was also used to understand the role of charged carriers and the active radical involved in the catalytic activity.

Efficient visible-light-induced hydrogen evolution from water splitting using a nanocrystalline nickel phosphide catalyst

RSC Advances ◽  
2016 ◽  
Vol 6 (29) ◽  
pp. 24361-24365 ◽  
Author(s):  
Weiming Wu ◽  
Xianyang Yue ◽  
Xiao-Yuan Wu ◽  
Can-Zhong Lu
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Good Stability ◽  
High Catalytic Activity ◽  
Nickel Phosphide

Nanocrystalline Ni12P5 was synthesized by a simple hydrothermal method. It showed high catalytic activity (10 760 μmol h−1 g−1, TOF = 9.3 h−1) and good stability (15 h) for the hydrogen evolution from water under visible light irradiation.

scholarly journals Photo-Fenton degradation of ethyl xanthate catalyzed by bentonite-supported Fe(II)/phosphotungstic acid under visible light irradiation

2018 ◽  
Vol 2017 (2) ◽  
pp. 473-480 ◽  
Author(s):  
Guangtao Wei ◽  
Yunshang Li ◽  
Shuya Cai ◽  
Zhongmin Li ◽  
Jihua Mo ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Phosphotungstic Acid ◽  
Light Irradiation ◽  
High Catalytic Activity ◽  
Ethyl Xanthate ◽  
Applicable Range ◽  
Almost All ◽  
Excellent Stability

Abstract In this study, using bentonite-supported Fe(II)/phosphotungstic acid composite (HPW-Fe-Organicbent) prepared by mechanochemical synthesis as heterogeneous catalyst, the photo-Fenton degradation of ethyl xanthate under visible light irradiation was studied in detail. The results showed that the degradation of ethyl xanthate was mainly impacted by H2O2 dosage, catalyst dosage and reaction time. HPW-Fe-Organicbent catalyst had a wide applicable range of pH and kept a high catalytic activity even at high pH in the photo-Fenton degradation of ethyl xanthate. It was found that the degradation of ethyl xanthate in the photo-Fenton process catalyzed by HPW-Fe-Organicbent mainly resulted from the hydroxyl radicals. HPW-Fe-Organicbent had an excellent stability in use, and retained almost all of its catalytic activity for four recycling times. Moreover, the kinetics study showed the degradation of ethyl xanthate, with the initial concentration below 50 mg/L, was well fitted by the pseudo-first-order rate model.

scholarly journals Preparation of recyclable MoO3 nanosheets for visible-light driven photocatalytic reduction of Cr(vi)

RSC Advances ◽  
2019 ◽  
Vol 9 (49) ◽  
pp. 28768-28774
Author(s):  
Wenxian Wei ◽  
Zhenxin Zhang ◽  
Guoxiang You ◽  
Yun Shan ◽  
Zuozheng Xu
Keyword(s):  
Heavy Metals ◽  
Catalytic Activity ◽  
Visible Light ◽  
Photocatalytic Reduction ◽  
High Catalytic Activity ◽  
Significant Challenge ◽  
Earth Abundant ◽  
Visible Light Driven

The exploitation of stable and earth-abundant photocatalysts with high catalytic activity remains a significant challenge for removing heavy metals from wastewater.

LDH-derived catalysts for complete oxidation of volatile organic compounds

Clay Minerals ◽  
1999 ◽  
Vol 34 (1) ◽  
pp. 67-77 ◽  
Author(s):  
K. Bahranowski ◽  
E. Bielańska ◽  
R. Janik ◽  
T. Machej ◽  
E. M. Serwicka
Keyword(s):  
Catalytic Activity ◽  
Mixed Oxide ◽  
Copper Chromite ◽  
Oxide System ◽  
High Catalytic Activity ◽  
Commercial Catalyst ◽  
Volatile Organic ◽  
Double Hydroxides ◽  
Very High

AbstractThe Cu,Cr-, Zn,Cr- and Cu,Al-layered double hydroxides have been synthesized by the coprecipitation method and characterized by elemental analysis, PXRD, SEM/EDS and BET. The mixed oxide materials obtained upon calcination at 873 K show very high catalytic activity for the combustion of toluene and ethanol. The best sample is derived from the Cu,Cr-LDH precursor with a Cu:Cr ratio of 2, composed of copper oxide and copper chromite. This catalyst gave 50% conversion of toluene and ethanol at temperatures of 45 and 15 K lower, respectively, than the reference commercial catalyst. Catalytic tests with a mechanical mixture of CuO and CuCr2O4 demonstrate that the use of an LDH precursor is essential for optimum results. The importance of the simultaneous presence of both Cu and Cr, the influence of the Cu:Cr ratio on the catalytic activity and the role of the interface boundaries in the CuO-CuCr2O4 mixed oxide system are discussed.

Chitosan Based Nanocomposite Materials as Photocatalyst – A Review

2014 ◽  
Vol 781 ◽  
pp. 79-94 ◽  
Author(s):  
A. Nithya ◽  
Kandasamy Jothivenkatachalam ◽  
S. Prabhu ◽  
K. Jeganathan
Keyword(s):  
Catalytic Activity ◽  
Environmental Remediation ◽  
Low Cost ◽  
Nanocomposite Materials ◽  
Heterogeneous Photocatalysis ◽  
Organic Polymer ◽  
High Catalytic Activity ◽  
Environmental Application ◽  
Industrial Activities

Heterogeneous photocatalysis is a significant technology for environmental application. Moreover, immobilising an appropriate catalyst on the surface of a natural organic polymer presents a number of additional advantages including low-cost, high catalytic activity and extensive potential reuse for the application of pharmaceutical, biomedical and industrial activities. This review mainly focuses on the role of chitosan based material as photocatalyst on the environmental remediation.

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