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.

scholarly journals Stable CuCrO2 nanoparticles - ZnO fibres p-n heterostructure system for effective photocatalytic activity

2019 ◽  
Vol 13 (2) ◽  
pp. 189-201 ◽  
Author(s):  
Elif Baylan ◽  
Hasan Akyildiz ◽  
Ozlem Yildirim
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Uv Light ◽  
Light Exposure ◽  
Band Gap Energy ◽  
Blue Dye ◽  
Nanoparticle Dispersion ◽  
K Value ◽  
Composite Photocatalyst ◽  
Visible Light Active

Heterostructured photocatalysts were fabricated by coupling electrospun n-type ZnO fibres and hydrothermally derived p-type CuCrO2 nanoparticles. The effect of the amount of CuCrO2 nanoparticles on the photocatalytic activity of the heterostructured photocatalyst was systematically investigated. The formation of the heterojunctions between the two semiconductors was revealed via detailed XRD, XPS, TEM and optical property measurements. The experimental results indicated that the optimal CuCrO2 amount in the composite photocatalyst was 1.0wt.% due to the optimum doping and surface coverage, higher absorption onset edge, larger absorption intensity and optimum band gap energy. This composite photocatalyst, fabricated by drop casting of CuCrO2 nanoparticle dispersion on ZnO fibres, displayed 30% higher rate constant (k) value compared to the pure ZnO fibres in the degradation of methylene blue dye molecules and reached 93.4% decomposition in 1 h under UV-visible light exposure. The obtained results are highly encouraging in comparison to only UV/light active p-n heterostructured photocatalysts previously reported in literature. Therefore, we believe that the proposed approach here opened the way for simple synthesis of highly-efficient visible light active heterostructured semiconductor photocatalyst systems.

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.

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.

Metal‐Free and Heterogeneous Photocatalytic Reduction of 4‐Nitroaniline by a Poly(Ethylene Glycol)‐Supported Eosin Dye under Visible‐Light Exposure

ChemCatChem ◽  
2019 ◽  
Vol 11 (14) ◽  
pp. 3307-3317
Author(s):  
Andreea L. Chibac ◽  
Violeta Melinte ◽  
Vlasta Brezová ◽  
Estelle Renard ◽  
Arnaud Brosseau ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Visible Light ◽  
Light Exposure ◽  
Photocatalytic Reduction ◽  
Poly Ethylene Glycol ◽  
Metal Free ◽  
Poly Ethylene

Hybrid Energy Conversion and Storage (HECS) Cells of the Composite Materials between Visible-Light Active Co(OH)2and UV-Light Active Ni(OH)2

2018 ◽  
Vol 85 (13) ◽  
pp. 1203-1217 ◽  
Author(s):  
Ketsuda Kongsawatvoragul ◽  
Saran Kalasina ◽  
Montakan Suksomboon ◽  
Nutthaphon Phattharasupakun ◽  
Juthaporn Wutthiprom ◽  
...  
Keyword(s):  
Composite Materials ◽  
Visible Light ◽  
Energy Conversion ◽  
Uv Light ◽  
Hybrid Energy ◽  
Energy Conversion And Storage ◽  
Visible Light Active ◽  
And Storage

scholarly journals Semiconducting Nanocrystalline Bismuth Oxychloride (BiOCl) for Photocatalytic Reduction of CO2

Catalysts ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 998
Author(s):  
Dalia Sánchez-Rodríguez ◽  
Alma Berenice Jasso-Salcedo ◽  
Niklas Hedin ◽  
Tamara L. Church ◽  
Aitor Aizpuru ◽  
...  
Keyword(s):  
Band Gap ◽  
Carbon Capture ◽  
Uv Light ◽  
Active Catalyst ◽  
Triethylene Glycol ◽  
Photocatalytic Reduction ◽  
Carbon Capture And Utilization ◽  
Reduction Of Co2 ◽  
A Minor ◽  
Band Gap Tuning

The reduction of CO2 is relevant for the production of compounds as part of the carbon capture and utilization research approaches. Thus, photocatalytic reduction of CO2 over a tailored BiOCl-based photocatalyst (BTEG) was tested under UV light (365 nm). BTEG was synthesized in the presence of triethylene glycol, which gave 4-nm crystallites, much smaller than the 30 nm crystallites of commercial BiOCl. Commercial BiOCl reduced CO2 mainly to methane with a minor fraction of ethanol, and was inactivated after 20 h. BTEG was a more active catalyst for CO2 photoreduction, producing approximately equal amounts of methane, methanol, and ethanol while consuming 0.38 µmol g−1 h−1 of CO2 before the experiment was stopped after 43 h, with the catalyst still active. The different products formed by the BTEG photocatalyst samples were tentatively ascribed to its greater content of {110} facets. Thus, in addition to band-gap tuning, the relative fractions of BiOCl facets had a key role in the effective photocatalytic reduction of CO2, and the BiOCl-based BTEG catalyst promoted the formation of important compounds as methanol and ethanol.

Ni0.85Co0.15WO4 for Photocatalytic Reduction of CO2 Under Mild Conditions with High Activity and Selectivity

2020 ◽  
Vol 150 (11) ◽  
pp. 3071-3078
Author(s):  
Chunmei Guo ◽  
Biao Guo ◽  
Xiaosu Gao ◽  
Jing Liang ◽  
Qide Meng ◽  
...  
Keyword(s):  
High Activity ◽  
Photocatalytic Reduction ◽  
Mild Conditions ◽  
Reduction Of Co2
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