scholarly journals An integrated photocatalytic/enzymatic system for the reduction of CO2 to methanol in bioglycerol–water

2014 ◽  
Vol 10 ◽  
pp. 2556-2565 ◽  
Author(s):  
Michele Aresta ◽  
Angela Dibenedetto ◽  
Tomasz Baran ◽  
Antonella Angelini ◽  
Przemysław Łabuz ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydride Transfer ◽  
Regeneration Process ◽  
Glycerol Solution ◽  
Enzymatic System ◽  
Practical Application ◽  
Nadh Regeneration ◽  
Visible Light Active ◽  
Water Glycerol ◽  
Reduction Of Co2

A hybrid enzymatic/photocatalytic approach for the conversion of CO2 into methanol is described. For the approach discussed here, the production of one mol of CH3OH from CO2 requires three enzymes and the consumption of three mol of NADH. Regeneration of the cofactor NADH from NAD+ was achieved by using visible-light-active, heterogeneous, TiO2-based photocatalysts. The efficiency of the regeneration process is enhanced by using a Rh(III)-complex for facilitating the electron and hydride transfer from the H-donor (water or a water–glycerol solution) to NAD+. This resulted in the production of 100 to 1000 mol of CH3OH from one mol of NADH, providing the possibility for practical application.

Hetero-structure CdS–CuFe2O4 as an efficient visible light active photocatalyst for photoelectrochemical reduction of CO2 to methanol

2019 ◽  
Vol 44 (48) ◽  
pp. 26271-26284 ◽  
Author(s):  
Mostafa Tarek ◽  
Kaykobad Md. Rezaul Karim ◽  
Shaheen M. Sarkar ◽  
Anjan Deb ◽  
Huei Ruey Ong ◽  
...  
Keyword(s):  
Visible Light ◽  
Hetero Structure ◽  
Visible Light Active ◽  
Reduction Of Co2

scholarly journals Photocatalytic Reduction of CO2 to Methanol by Cu2O/TiO2 Heterojunctions

2021 ◽  
Vol 14 (1) ◽  
pp. 374
Author(s):  
S.-P. Cheng ◽  
L.-W. Wei ◽  
H.-Paul Wang
Keyword(s):  
Solar Energy ◽  
Visible Light ◽  
Uv Light ◽  
Light Exposure ◽  
Photocatalytic Reduction ◽  
Low Carbon ◽  
Mild Conditions ◽  
Photogenerated Electrons ◽  
Visible Light Active ◽  
Reduction Of Co2

The conversion of CO2 to low-carbon fuels using solar energy is considered an economically attractive and environmentally friendly route. The development of novel catalysts and the use of solar energy via photocatalysis are key to achieving the goal of chemically reducing CO2 under mild conditions. TiO2 is not very effective for the photocatalytic reduction of CO2 to low-carbon chemicals such as methanol (CH3OH). Thus, in this work, novel Cu2O/TiO2 heterojunctions that can effectively separate photogenerated electrons and holes were prepared for photocatalytic CO2-to-CH3OH. More visible light-active Cu2O in the Cu2O/TiO2 heterojunctions favors the formation of methanol under visible light irradiation. On the other hand, under UV-Vis irradiation for 6 h, the CH3OH yielded from the photocatalytic CO2-to-CH3OH by the Cu2O/TiO2 heterojunctions is 21.0–70.6 µmol/g-catalyst. In contrast, the yield of CH3OH decreases with an increase in the Cu2O fraction in the Cu2O/TiO2 heterojunctions. It seems that excess Cu2O in Cu2O/TiO2 heterojunctions may lead to less UV light exposure for the photocatalysts, and may decrease the conversion efficiency of CO2 to CH3OH.

Dinuclear uranium(vi) salen coordination compound: an efficient visible-light-active catalyst for selective reduction of CO2 to methanol

2020 ◽  
Vol 49 (47) ◽  
pp. 17243-17251
Author(s):  
Mohammad Azam ◽  
Umesh Kumar ◽  
Joshua O. Olowoyo ◽  
Saud I. Al-Resayes ◽  
Agata Trzesowska-Kruszynska ◽  
...  
Keyword(s):  
Visible Light ◽  
Coordination Compound ◽  
Active Catalyst ◽  
Selective Reduction ◽  
Photocatalytic Reduction ◽  
Visible Light Active ◽  
Reduction Of Co2

The newly synthesized dinuclear uranyl salen coordination compound showed excellent photocatalytic reduction of CO2 to methanol.

Visible Light Active Ce-doped TiO2 Nanoparticles for Photocatalytic Degradation of Methylene Blue

2016 ◽  
Vol 13 (1) ◽  
pp. 110-116 ◽  
Author(s):  
Rani P. Barkul ◽  
Farah-Naaz A. Shaikh ◽  
Sagar D. Delekar ◽  
Meghshyam K. Patil
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Tio2 Nanoparticles ◽  
Doped Tio2 ◽  
Visible Light Active

Green Synthesis of ZnO/Dy/NiO Heterostructures for Enhanced Photocatalytic Applications

2020 ◽  
Vol 1 (1) ◽  
pp. 30-36
Author(s):  
Shubha Jayachamarajapura Pranesh ◽  
Diwya Lanka
Keyword(s):  
Visible Light ◽  
Uv Light ◽  
Combustion Method ◽  
Hybrid Nanocomposites ◽  
Synthetic Dyes ◽  
Hybrid Nanostructure ◽  
Wide Range ◽  
Visible Light Active ◽  
Textile Industries ◽  
Photocatalytic Applications

Background: Textile industries discharge harmful synthetic dyes to nearby water sources. These colour effluents should be treated before discharge to reduce the toxicity caused by synthetic colours. Objective: To synthesize visible light active superstructures to reduce water pollution caused by textile industries. Methods: We have successfully synthesized ZnO/Dy/NiO hybrid nanocomposites using waste curd as fuel by a simple combustion method. The obtained material was able to reduce recombination and enhanced the photocatalytic degradation of organic pollutants. The as-synthesized material was characterized by XRD, absorption spectroscopy, FESEM, EDAX, etc. The obtained hybrid nanostructure was used as a photocatalyst for the degradation of methylene blue under sunlight, UV light as well as in dark. Comparative experiments were carried out with a variation of catalytic load, pH, dye concentrations, etc. for a better understanding of the performance of the catalyst at various conditions. Results and Conclusion: The ternary compound shows wide range of absorption by expanding absorption band both in UV and visible regions. ZnO/Dy/NiO hybrid nanocomposites performed well and showed uniqueness in the activity uder visible light.

LaTaON2-BaTaO2N solid solution for water oxidation

2021 ◽  
Author(s):  
Yuwei Zhang ◽  
Xiaoxiang Xu
Keyword(s):  
Solid Solution ◽  
Visible Light ◽  
Water Oxidation ◽  
Oxidation Reactions ◽  
Visible Light Active

Solid solution of LaTaON2 and BaTaO2N, i.e., La1-xBaxTaO1+yN2-y (0 ≤ x, y ≤ 1), have been investigated as visible-light-active photocatalysts for water oxidation reactions. A number of important parameters such...

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