Controlling the shape of anatase nanocrystals for enhanced photocatalytic reduction of CO2 to methanol

2017 ◽  
Vol 41 (13) ◽  
pp. 5660-5668 ◽  
Author(s):  
Quang Duc Truong ◽  
Huu Thu Hoa ◽  
Dai-Viet N. Vo ◽  
Thanh Son Le
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Method ◽  
Photocatalytic Reduction ◽  
Facile Hydrothermal Method ◽  
Anatase Titania ◽  
Reduction Of Co2

Anatase titania with tunable shapes has been synthesized by a facile hydrothermal method using peroxotitanic acid as a precursor. The results of investigations showed that the photocatalytic activity in the reduction of CO2 to methanol increased with an increase in the percentage of {001} surfaces.

Facile preparation of C, N co-modified Nb2O5 nanoneedles with enhanced visible light photocatalytic activity

2016 ◽  
Vol 45 (41) ◽  
pp. 16519-16525 ◽  
Author(s):  
Jiao Xue ◽  
Runwei Wang ◽  
Zongtao Zhang ◽  
Shilun Qiu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Nitrogen Source ◽  
Hydrothermal Method ◽  
Niobium Pentoxide ◽  
Facile Hydrothermal Method ◽  
Carbon And Nitrogen ◽  
Niobium Chloride ◽  
Facile Preparation ◽  
Visible Light Photocatalytic

C, N co-modified niobium pentoxide (Nb2O5) nanoneedles have been successfully synthesized via a facile hydrothermal method with Niobium Chloride (NbCl5) as a precursor and triethylamine as both the carbon and nitrogen source.

scholarly journals Photoreduction of Carbon Dioxide to Methanol over Copper Based Zeolitic Imidazolate Framework-8: A New Generation Photocatalyst

Catalysts ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 581 ◽  
Author(s):  
Sonam Goyal ◽  
Maizatul Shaharun ◽  
Chong Kait ◽  
Bawadi Abdullah ◽  
Mariam Ameen
Keyword(s):  
Photocatalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Ammonium Hydroxide ◽  
Photocatalytic Reduction ◽  
Zeolitic Imidazolate Framework ◽  
X Ray ◽  
Efficient Reduction ◽  
Vis Spectroscopy ◽  
Metal Organic ◽  
Reduction Of Co2

The efficient reduction of CO2 into valuable products such as methanol, over metal-organic frameworks (MOFs) based catalyst, has received much attention. The photocatalytic reduction is considered the most economical method due to the utilization of solar energy. In this study, Copper (II)/Zeolitic Imidazolate Framework-8 (Cu/ZIF-8) catalysts were synthesized via a hydrothermal method for photocatalytic reduction of CO2 to methanol. The synthesized catalysts were characterized by X-ray Photoelectron Spectroscopy (XPS), Field Emission Scanning Electron Microscopy (FESEM) coupled with Energy Dispersive X-ray (EDX), Ultraviolet-visible (UV-vis) spectroscopy, and X-Ray Diffraction (XRD). The host ZIF-8, treated with 2 mmol copper prepared in 2M ammonium hydroxide solution showed the highest photocatalytic activity. The crystal structures of ZIF-8 and 2Cu/ZIF-8N2 catalysts were observed as cubic and orthorhombic, respectively and the XPS analysis confirmed the deposition of Cu (II) ions over ZIF-8 surface among all the prepared catalysts. The orthorhombic structure, nano-sized crystals, morphology and Cu loading of the 2Cu/ZIF-8N2 catalyst were the core factors to influence the photocatalytic activity. The yield of Methanol was found to be 35.82 µmol/L·g after 6 h of irradiations on 2Cu/ZIF-8N2 catalyst in the wavelength range between 530–580 nm. The copper-based ZIF-8 catalyst has proven as an alternative approach for the economical photocatalytic reduction of CO2 to CH3OH.

Highly efficient and stable photocatalytic reduction of CO2 to CH4 over Ru loaded NaTaO3

2015 ◽  
Vol 51 (36) ◽  
pp. 7645-7648 ◽  
Author(s):  
Mu Li ◽  
Peng Li ◽  
Kun Chang ◽  
Tao Wang ◽  
Lequan Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Electron Donor ◽  
Water Oxidation ◽  
Reduction Process ◽  
Photocatalytic Reduction ◽  
Highly Efficient ◽  
Main Effect ◽  
Reduction Of Co2

An efficient and stable photocatalytic activity was obtained over NaTaO3 by introducing electron donor (H2) into the CO2 reduction process with water and loaded Ru as cocatalysts. The main effect of the electron donor was found to release the peroxide intermediates of the half reaction for water oxidation.

scholarly journals Highly efficient photocatalytic activity of Ag3PO4/Ag/ZnS(en)0.5 photocatalysts through Z-scheme photocatalytic mechanism

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18392-18399 ◽  
Author(s):  
Na Wei ◽  
Hongzhi Cui ◽  
Mingliang Wang ◽  
Xinzhen Wang ◽  
Xiaojie Song ◽  
...  
Keyword(s):  
Composite Material ◽  
Photocatalytic Activity ◽  
Hydrothermal Method ◽  
Facile Hydrothermal Method ◽  
Photocatalytic Mechanism ◽  
Highly Efficient

A novel Z-scheme Ag3PO4/Ag/ZnS(en)0.5 composite material was successfully prepared via a facile hydrothermal method and in situ precipitation.

scholarly journals Selective photocatalytic reduction of CO2 to methanol in CuO-loaded NaTaO3 nanocubes in isopropanol

2016 ◽  
Vol 7 ◽  
pp. 776-783 ◽  
Author(s):  
Tianyu Xiang ◽  
Feng Xin ◽  
Jingshuai Chen ◽  
Yuwen Wang ◽  
Xiaohong Yin ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
High Activity ◽  
Hydrothermal Method ◽  
Oxidation Product ◽  
Photocatalytic Reduction ◽  
Band Theory ◽  
Good Crystallinity ◽  
Naoh Solution ◽  
Reduction Of Co2 ◽  
Selective Formation

A series of NaTaO3 photocatalysts were prepared with Ta2O5 and NaOH via a hydrothermal method. CuO was loaded onto the surface of NaTaO3 as a cocatalyst by successive impregnation and calcination. The obtained photocatalysts were characterized by XRD, SEM, UV–vis, EDS and XPS and used to photocatalytically reduce CO2 in isopropanol. This worked to both absorb CO2 and as a sacrificial reagent to harvest CO2 and donate electrons. Methanol and acetone were generated as the reduction product of CO2 and the oxidation product of isopropanol, respectively. NaTaO3 nanocubes loaded with 2 wt % CuO and synthesized in 2 mol/L NaOH solution showed the best activity. The methanol and acetone yields were 137.48 μmol/(g·h) and 335.93 μmol/(g·h), respectively, after 6 h of irradiation. Such high activity could be attributed to the good crystallinity, morphology and proper amount of CuO loading, which functioned as reductive sites for selective formation of methanol. The reaction mechanism was also proposed and explained by band theory.

scholarly journals Controlled synthesis of Sn-based oxides via a hydrothermal method and their visible light photocatalytic performances

RSC Advances ◽  
2017 ◽  
Vol 7 (43) ◽  
pp. 27024-27032 ◽  
Author(s):  
Jinghui Wang ◽  
Hui Li ◽  
Sugang Meng ◽  
Xiangju Ye ◽  
Xianliang Fu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Controlled Synthesis ◽  
Facile Hydrothermal Method ◽  
Visible Light Photocatalytic Activity ◽  
Photocatalytic Performances ◽  
Visible Light Photocatalytic

Controlled synthesize of Sn-oxides was achieved via a facile hydrothermal method with SnCl2 as precursor. A visible light photocatalytic activity of SnO2 can be induced by doping with Sn2+ or coupling with SnO.

Highly efficient photocatalytic reduction of CO2 to CO using cobalt oxide-coated spherical mesoporous silica particles as catalysts

2019 ◽  
Vol 55 (77) ◽  
pp. 11523-11526 ◽  
Author(s):  
Zi-Cheng Fu ◽  
Joshua T. Moore ◽  
Fei Liang ◽  
Wen-Fu Fu
Keyword(s):  
Photocatalytic Activity ◽  
Mesoporous Silica ◽  
Cobalt Oxide ◽  
Silica Particles ◽  
Photocatalytic Reduction ◽  
Oxide Nanoparticles ◽  
Cobalt Oxide Nanoparticles ◽  
Hybrid Catalysts ◽  
Co Conversion ◽  
Reduction Of Co2

Hybrid catalysts that cobalt oxide nanoparticles immobilized on outside surfaces of spherical SBA-15 presented unexpected photocatalytic activity towards CO2-to-CO conversion.

Synthesis of vertical WO3 nanoarrays with different morphologies using the same protocol for enhanced photocatalytic and photoelectrocatalytic performances

RSC Advances ◽  
2021 ◽  
Vol 11 (38) ◽  
pp. 23700-23706
Author(s):  
Jingjing Li ◽  
Chenpeng Guo ◽  
Lihua Li ◽  
Yongjun Gu ◽  
BoK.-Hee Kim ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Hydrothermal Method ◽  
Seed Layer ◽  
Facile Hydrothermal Method ◽  
Structure Directing Agent

Hexagonal nanoflower WO3 arrays were synthesized via a facile hydrothermal method without the assistance of any seed layer or structure directing agent. The nanoflower WO3 has the highest photocatalytic activity for the degradation of methylene blue.

scholarly journals Titanate Tubular Loaded Diatom Fabricated by a Facial Hydrothermal Method for Photocatalytic Enhancement under Visible Light Irradiation

2020 ◽  
Vol 36 (4) ◽  
Author(s):  
Nguyen Xuan Sang ◽  
Vo Cao Minh ◽  
Le Hong Phuc ◽  
Nguyen Thi Quynh Trang ◽  
Vo Quang Mai
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Method ◽  
Carrier Lifetime ◽  
Emission Measurement ◽  
Facile Hydrothermal Method ◽  
Sunlight Irradiation ◽  
X Ray ◽  
Bandgap Narrowing ◽  
Transmission Electron ◽  
Synthesized Materials

In this study, homogeneous titanate tubular (TNT) and diatom/TNT composites (D/TNT) were prepared by a facile hydrothermal method. The crystalline structure and morphology of the synthesised samples were studied by X-ray diffractometry (XRD), Raman spectroscopy, Transmission Electron Microscopy (TEM). Furthermore, the photocatalytic activity for degradation of methylene blue (MB) was investigated under sunlight irradiation. The results showed that the MB degradation by D/TNT was higher than bare TNT. Optical properties of the synthesized materials with enhanced photocatalytic activity could be explained through both UV-vis diffuse absorption and photoluminescence emission measurement. These results indicated that there was bandgap narrowing and longer carrier lifetime in the composite sample.

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