TiO2–rGO nanocomposite as an efficient catalyst to photodegrade formalin in aquaculture's waters, under solar light

2020 ◽  
Vol 6 (4) ◽  
pp. 1018-1027 ◽  
Author(s):  
Joana F. Leal ◽  
Sandra M. A. Cruz ◽  
Bernardo T. A. Almeida ◽  
Valdemar I. Esteves ◽  
Paula A. A. P. Marques ◽  
...  
Keyword(s):  
Solar Light ◽  
Photocatalytic Process ◽  
Efficient Catalyst

A solar photocatalytic process, using TiO2–rGO as photocatalyst, is proposed to degrade the formalin disinfectant. This process can treat aquaculture freshwater before its discharge or recirculation, promoting sustainable water.

Solar light harvest: modified d-block metals in photocatalysis

2020 ◽  
Vol 10 (16) ◽  
pp. 5321-5344
Author(s):  
Williams Kweku Darkwah ◽  
Masso Kody Christelle Sandrine ◽  
Buanya Beryl Adormaa ◽  
Godfred Kwesi Teye ◽  
Joshua Buer Puplampu
Keyword(s):  
Chemical Stability ◽  
Low Cost ◽  
Solar Light ◽  
Photocatalytic Process

With solar light, modified d-block metal photocatalysts are useful in areas where electricity is insufficient, with its chemical stability during the photocatalytic process, and its low-cost and nontoxicity.

scholarly journals Graphene nanocrystals in CO2 photoreduction with H2O for fuel production

2020 ◽  
Vol 2 (3) ◽  
pp. 991-1006 ◽  
Author(s):  
Williams Kweku Darkwah ◽  
Godfred Kwesi Teye ◽  
Yanhui Ao
Keyword(s):  
Chemical Stability ◽  
Low Cost ◽  
Solar Light ◽  
Photocatalytic Process ◽  
Fuel Production ◽  
Co2 Photoreduction

Graphene nanocrystals can utilize solar light and are valuable in cases where electricity is lacking due to their chemical stability during the photocatalytic process, low cost and non-toxicity.

Dual-sensitized upconversion-assisted, triple-band absorbing luminescent solar concentrators

Nanoscale ◽  
2020 ◽  
Vol 12 (33) ◽  
pp. 17265-17271
Author(s):  
Seong Kyung Nam ◽  
Kiwon Kim ◽  
Ji-Hwan Kang ◽  
Jun Hyuk Moon
Keyword(s):  
Solar Light ◽  
Photovoltaic Systems ◽  
Solar Concentrator ◽  
Solar Concentrators ◽  
Luminescent Solar Concentrators ◽  
Luminescent Solar Concentrator ◽  
Triple Band

Luminescent solar concentrator-photovoltaic systems (LSC-PV) harvest solar light by using transparent photoluminescent plates, which is expected to be particularly useful for building-integrated PV applications.

Photoelectrochemical experiments under various solar light concentration ratios

1999 ◽  
Vol 09 (PR3) ◽  
pp. Pr3-301-Pr3-306
Author(s):  
O. Enea ◽  
J. Blanco ◽  
S. Malato ◽  
M. I. Maldonado
Keyword(s):  
Solar Light ◽  
Light Concentration ◽  
Concentration Ratios

Photocatalytic Discolouration of Solutions of Reactive Dyes in the Presence of H2O2

1995 ◽  
Vol 30 (1) ◽  
pp. 53-60 ◽  
Author(s):  
Deng Nansheng ◽  
Tian Shizhong ◽  
Xia Mei
Keyword(s):  
Photochemical Reaction ◽  
Uv Light ◽  
Reactive Dyes ◽  
Solar Light ◽  
Rate Equations ◽  
Oh Radical ◽  
Test Results ◽  
Dye Molecules ◽  
First Order ◽  
Dye Solutions

Abstract Tests for the photocatalytic degradation of solutions of three reactive dyes, Red M-5B, Procion Blue MX-R and Procion Black H-N, in the presence of H2O2 were carried out. When the solutions of the three reactive dyes were irradiated by UV or solar light, the colour of the solutions disappeared gradually. A statistical analysis of the test results indicated a linear relation between the concentration of dyes and the time of irradiation. The discolouration reaction of the solutions was of the first order. Rate equations for the discolouration reactions of dye solutions were developed. The dark reactions or the dye solutions containing H2O2 were very slow, illustrating that the photochemical reaction played a very important role. It was demonstrated that UV light and solar light (300 to 380 nm) photolyzes the HO and that the resulting OH radical reacts with the dye molecules and destroys the chromophore.

Preparation and Characterization of a Novel Room Temperature Dicationic Ionic Liquid and its Application in the Synthesis of Xanthenediones Under Solvent-Free Conditions

2018 ◽  
Vol 21 (8) ◽  
pp. 602-608 ◽  
Author(s):  
Zainab Ehsani-Nasab ◽  
Ali Ezabadi
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Reaction Times ◽  
Significant Loss ◽  
Solvent Free ◽  
Acidity Function ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Hammett Acidity Function ◽  
Dicationic Ionic Liquid

Aim and Objective: In the present work, 1, 1’-sulfinyldiethylammonium bis (hydrogen sulfate) as a novel room temperature dicationic ionic liquid was synthesized and used as a catalyst for xanthenediones synthesis. Material and Method: The dicationic ionic liquid has been synthesized using ethylamine and thionyl chloride as precursors. Then, by the reaction of [(EtNH2)2SO]Cl2 with H2SO4, [(EtNH2)2SO][HSO4]2 was prepared and after that, it was characterized by FT-IR, 1H NMR, 13C NMR as well as Hammett acidity function. This dicationic ionic liquid was used as a catalyst for the synthesis of xanthenediones via condensation of structurally diverse aldehydes and dimedone under solvent-free conditions. The progress of the reaction was monitored by thin layer chromatography (ethyl acetate/n-hexane = 3/7). Results: An efficient solvent-free method for the synthesis of xanthenediones has been developed in the presence of [(EtNH2)2SO][HSO4]2 as a powerful catalyst with high to excellent yields, and short reaction times. Additionally, recycling studies have demonstrated that the dicationic ionic liquid can be readily recovered and reused at least four times without significant loss of its catalytic activity. Conclusion: This new dicationic ionic liquid can act as a highly efficient catalyst for xanthenediones synthesis under solvent-free conditions.

Chiral Mn(III) Salen Complex Immobilized on CuFe2O4@SiO2-NH2 NPs: A Cheap and Efficient Catalyst for N-arylation of Aryl Halides and Phenylboronic Acid Under Mild Conditions

2020 ◽  
Vol 17 (11) ◽  
pp. 857-863
Author(s):  
Mohammad Ali Nasseri ◽  
Seyyedeh Ameneh Alavi ◽  
Milad Kazemnejadi ◽  
Ali Allahresani
Keyword(s):  
Phenylboronic Acid ◽  
Significant Loss ◽  
Aryl Halides ◽  
Coupling Reactions ◽  
Efficient Catalyst ◽  
Aryl Chlorides ◽  
Mild Conditions ◽  
Cross Coupling Reactions ◽  
Salen Complex ◽  
Ft Ir

A convenient and efficient chiral CuFe2O4@SiO2-Mn(III) Ch.salen nanocatalyst has been developed for the C-N cross-coupling reactions of aryl halides/ phenylboronic acid with N-heterocyclic compounds in water and/or DMSO under mild conditions. The catalyst could be applied for the N-arylation of a variety of nitrogen-containing heterocycles with aryl chlorides, bromides, iodides and phenylboronic acid under mild conditions. Moderate to good yields were achieved for all substrates. The structure of catalyst was characterized using various techniques including FT-IR, FE-SEM, EDX, XRD, TEM and TGA. The catalyst can be simply recovered and reused for several times without significant loss of activity.

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