Polyimide with enhanced π stacking for efficient visible-light-driven photocatalysis

2021 ◽  
Author(s):  
Kelian Zhang ◽  
Hanmei Li ◽  
Haixian Shi ◽  
Wei Hong
Keyword(s):  
Visible Light ◽  
Surface Area ◽  
Organic Semiconductor ◽  
Light Harvesting ◽  
Photocatalytic Efficiency ◽  
Π Stacking ◽  
Visible Light Driven ◽  
Donor Acceptor

The organic semiconductor of polyimide has received considerable attention as a chemically stable donor-acceptor photocatalyst, yet exhibits moderate photocatalytic efficiency which is limited by low surface area, insufficient light harvesting...

Colocalization of Light Harvesting and Catalytic Units in ‘Soft’ Coordination Polymer Hydrogel toward Visible-Light Driven Photocatalytic Hydrogen Production

2021 ◽  
Author(s):  
Parul Verma ◽  
Ashish Singh ◽  
Faruk Ahamed Rahimi ◽  
Tapas Kumar Maji
Keyword(s):  
Hydrogen Production ◽  
Coordination Polymer ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Light Harvesting ◽  
Sustainable Energy ◽  
Supramolecular Assembly ◽  
Polymer Hydrogel ◽  
Visible Light Driven ◽  
Molecular Components

Colocalization of essential molecular components in the solvated soft supramolecular assembly towards realizing visible-light-driven hydrogen evolution would be an exciting approach for sustainable energy by generating clean solar fuel. In...

High Surface Area SnO2 -Ta2 O5 Composite for Visible Light-driven Photocatalytic Degradation of an Organic Dye

2018 ◽  
Vol 94 (4) ◽  
pp. 633-640 ◽  
Author(s):  
Bharath Velaga ◽  
Pradeep P. Shanbogh ◽  
Diptikanta Swain ◽  
Chandrabhas Narayana ◽  
Nalini G. Sundaram
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Organic Dye ◽  
Visible Light Driven

scholarly journals The Photocatalytic and Antibacterial Performance of Nitrogen-Doped TiO2: Surface-Structure Dependence and Silver-Deposition Effect

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2261 ◽  
Author(s):  
Abdul Wafi ◽  
Erzsébet Szabó-Bárdos ◽  
Ottó Horváth ◽  
Mihály Pósfai ◽  
Éva Makó ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Visible Light ◽  
Surface Area ◽  
Photocatalytic Performance ◽  
Visible Region ◽  
Bet Surface Area ◽  
Doped Tio2 ◽  
X Ray ◽  
Nitrogen Doped ◽  
Visible Light Driven

Catalysts for visible-light-driven oxidative cleaning processes and antibacterial applications (also in the dark) were developed. In order to extend the photoactivity of titanium dioxide into the visible region, nitrogen-doped TiO2 catalysts with hollow and non-hollow structures were synthesized by co-precipitation (NT-A) and sol–gel (NT-U) methods, respectively. To increase their photocatalytic and antibacterial efficiencies, various amounts of silver were successfully loaded on the surfaces of these catalysts by using a facile photo-deposition technique. Their physical and chemical properties were evaluated by using scanning electron microscopy (SEM), transmission electron microscopy–energy dispersive X-ray spectroscopy (TEM–EDS), Brunauer–Emmett–Teller (BET) surface area, X-ray diffraction (XRD), and diffuse reflectance spectra (DRS). The photocatalytic performances of the synthesized catalysts were examined in coumarin and 1,4-hydroquinone solutions. The results showed that the hollow structure of NT-A played an important role in obtaining high specific surface area and appreciable photoactivity. In addition, Ag-loading on the surface of non-hollow structured NT-U could double the photocatalytic performance with an optimum Ag concentration of 10−6 mol g−1, while a slight but monotonous decrease was caused in this respect for the hollow surface of NTA upon increasing Ag concentration. Comparing the catalysts with different structures regarding the photocatalytic performance, silverized non-hollow NT-U proved competitive with the hollow NT-A catalyst without Ag-loading for efficient visible-light-driven photocatalytic oxidative degradations. The former one, due to the silver nanoparticles on the catalyst surface, displayed an appreciable antibacterial activity, which was comparable to that of a reference material practically applied for disinfection in polymer coatings.

Effects of Synthesis Conditions on the Crystalline Phases and Photocatalytic Activities of Silver Vanadates via Hydrothermal Method

2009 ◽  
Vol 1171 ◽  
Author(s):  
Chao-Ming Huang ◽  
Guan T. Pan ◽  
Lung C. Chen ◽  
C.K. Thomas Yang ◽  
Wen S. Chang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Area ◽  
Synthesis Method ◽  
Stoichiometric Ratio ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
Synthesis Conditions ◽  
Vis Spectroscopy ◽  
Visible Light Driven

AbstractVisible-light-driven Ag3VO4 photocatalysts were successfully synthesized using low-temperature hydrothermal synthesis method. Under various hydrothermal conditions, the structures of silver vanadates were tuned by manipulating the hydrothermal time and the ratio of silver to vanadium. X-ray diffraction (XRD) results reveal that the powders prepared in a stoichiometric ratio consisted of pure α-Ag3VO4 or mixed phases of Ag4V2O7 and α-Ag3VO4. With increasing the Ag-to-V mole ratio to 6:1, the resulting samples were identified as pure monoclinic structure α-Ag3VO4. UV-vis spectroscopy indicated that silver vanadate particles had strong visible light absorption with associated band gaps in the range of 2.2-2.5 eV. The sample synthesized in the excess silver exhibited higher photocatalytic activity than that synthesized in a stoichiometric ratio. The powder synthesized at silver-rich at 140℃ for 4 h (SHT4) exhibited the highest photocatalytic activity among all samples. The reactivity of SHT4 (surface area, 3.52 m2 g-1) on the decomposition of gaseous benzene was about 16 times higher than that of P25 (surface area, 49.04 m2 g-1) under visible light irradiation. A well developed crystallinity of Ag3VO4 of SHT 4 was considered to enhance the photocatalytic efficiency.

Designed synthesis of unique ZnS@[email protected] hollow nanospheres for efficient visible-light-driven H2 evolution

CrystEngComm ◽  
2020 ◽  
Vol 22 (16) ◽  
pp. 2743-2755 ◽  
Author(s):  
Bowen Sun ◽  
Hui Wang ◽  
Jiakun Wu ◽  
Yanling Geng ◽  
Jixiang Xu ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Charge Separation ◽  
Active Sites ◽  
Light Harvesting ◽  
H2 Evolution ◽  
Hollow Nanospheres ◽  
Visible Light Driven ◽  
Designed Synthesis

Unique ZnS@[email protected] hollow nanospheres with abundant active sites and enhanced light-harvesting and charge separation demonstrate efficient H2 evolution from visible-light-driven water-splitting.

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