scholarly journals A light-driven supramolecular nanowire actuator

Nanoscale ◽  
2015 ◽  
Vol 7 (15) ◽  
pp. 6457-6461 ◽  
Author(s):  
Junho Lee ◽  
Seungwhan Oh ◽  
Jaeyeon Pyo ◽  
Jong-Man Kim ◽  
Jung Ho Je
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Uv Light ◽  
Light Irradiation ◽  
First Order ◽  
First Order Kinetics ◽  
Bending Behavior

Single light-driven molecular nanowire actuator is first developed that employs the azobenzene-containing tris(4-((E)-phenyldiazenyl)phenyl)-benzene-1,3,5-tricarboxamide (Azo-1). Single Azo-1 nanowires undergo bending upon irradiation with UV light that is reversed upon visible light irradiation, and the bending behavior follows first-order kinetics associated with azobenzene photoisomerization.

A photo-auxiliary approach – enabling excited state classical phototransformations with metal free visible light irradiation

2017 ◽  
Vol 53 (10) ◽  
pp. 1692-1695 ◽  
Author(s):  
Akila Iyer ◽  
Steffen Jockusch ◽  
Jayaraman Sivaguru
Keyword(s):  
Excited State ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Uv Light ◽  
Light Irradiation ◽  
Metal Free ◽  
High Yields

To address the problem of using UV light to initiate traditional photoreactions, hydrazide based chromophores are evaluated as a “photo-auxiliary“ with visible light using a metal free photocatalyst to afford photoproducts in high yields.

scholarly journals Photoswitchable Zirconium MOF for Light-Driven Hydrogen Storage

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 4052
Author(s):  
Vera V. Butova ◽  
Olga A. Burachevskaya ◽  
Vitaly A. Podshibyakin ◽  
Evgenii N. Shepelenko ◽  
Andrei A. Tereshchenko ◽  
...  
Keyword(s):  
Hydrogen Storage ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Hydrogen Adsorption ◽  
Uv Light ◽  
Metal Organic Framework ◽  
Light Irradiation ◽  
Open Conformation ◽  
Metal Organic ◽  
Adsorption Desorption

Here, we report a new photosensitive metal–organic framework (MOF) that was constructed via the modification of UiO-66-NH2 with diarylethene molecules (DAE, 4-(5-Methoxy-1,2-dimethyl-1H-indol-3-yl)-3-(2,5-dimethylthiophen-3-yl)-4-furan-2,5-dione). The material that was obtained was a highly crystalline porous compound. The photoresponse of the modified MOF was observed via UV–Vis and IR spectroscopy. Most of the DAE molecules inside of the UiO-66-pores had an open conformation after synthesis. However, the equilibrium was able to be shifted further toward an open conformation using visible light irradiation with a wavelength of 520 nm. Conversely, UV-light with a wavelength of 450 nm initiated the transformation of the photoresponsive moieties inside of the pores to a closed modification. We have shown that this transformation could be used to stimulate hydrogen adsorption–desorption processes. Specifically, visible light irradiation increased the H2 capacity of modified MOF, while UV-light decreased it. A similar hybrid material with DAE moieties in the UiO-66 scaffold was applied for hydrogen storage for the first time. Additionally, the obtained results are promising for smart H2 storage that is able to be managed via light stimuli.

Construction of ZnxCd1−xS/CeO2 composites for enhanced photocatalytic activity and stability by chemical precipitation method

2021 ◽  
pp. 2150334
Author(s):  
Yi-Feng Chai ◽  
Zhong-Hua Zhu ◽  
Ming-Wei Liu ◽  
Jing Zeng ◽  
Gui-Fang Huang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Uv Light ◽  
Chemical Precipitation ◽  
Charge Carriers ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Uv Light Irradiation

Development photoinduced photocatalysts is a significant approach to improve photocatalytic activity and stability. Herein, we successfully prepared Zn[Formula: see text]Cd[Formula: see text]S/CeO2 composites by a facile method. It is found that the Zn[Formula: see text]Cd[Formula: see text]S/CeO2 composites show significant enhancement in photocatalytic activity for methyl orange (MO) degradation under visible and UV light irradiation. The degradation efficiency reaches up to 3.7 times higher than that of pure CeO2 under visible light irradiation. Moreover, the Zn[Formula: see text]Cd[Formula: see text]S/CeO2 samples have almost no loss of photocatalytic activity after five recycles, indicating good photocatalytic stability of the samples. The attractive photocatalytic activity of the Zn[Formula: see text]Cd[Formula: see text]S/CeO2 samples could be attributed to the robust charge carriers transfer and separation.

scholarly journals Photocatalytic Hydrogen or Oxygen Evolution from Water over S- or N-Doped TiO2under Visible Light

2008 ◽  
Vol 2008 ◽  
pp. 1-7 ◽  
Author(s):  
Kazumoto Nishijima ◽  
Takaaki Kamai ◽  
Naoya Murakami ◽  
Toshiki Tsubota ◽  
Teruhisa Ohno
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Water Oxidation ◽  
Photocatalytic Oxidation ◽  
High Efficiency ◽  
Uv Light ◽  
Anatase Phase ◽  
Rutile Phase ◽  
Activity Level ◽  
Light Irradiation

S- or N-doping ofTiO2powder having an anatase or rutile phase extended the photocatalytic activity for water oxidation and reduction under UV light and visible light irradiation. For the reduction of water, anatase-dopedTiO2showed higher level of activity than that of dopedTiO2having a rutile phase using ethanol as an electron donor. Furthermore, the activity level of S-dopedTiO2for hydrogen evolution was higher than that of N-dopedTiO2photocatalysts under visible light. Photocatalytic oxidation of water on dopedTiO2having a rutile phase proceeded with fairly high efficiency whenFe3+ions were used as electron acceptors compared to that on dopedTiO2having an anatase phase. In addition, water splitting under visible light irradiation was achieved by construction of a Z-scheme photocatalysis system employing the dopedTiO2having anatase and rutile phases forH2andO2evolution and theI−/IO3−redox couple as an electron relay.

Photocatalytic Degradation of Carbaryl over Novel MWNT-TiO2 Nanocomposite under Visible Light Irradiation

2011 ◽  
Vol 233-235 ◽  
pp. 476-480
Author(s):  
Ke Dai ◽  
Hai Bo Chen ◽  
Xu Li ◽  
Hao Chen ◽  
Qiao Yun Huang
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Ring Opening ◽  
Uv Light ◽  
Light Irradiation ◽  
Photodegradation Efficiency ◽  
Uv Light Irradiation ◽  
Ring Opening Reaction ◽  
Visible Light Driven ◽  
Direct Growth

The MWNT-TiO2nanocomposite was synthesized via direct growth of TiO2nanoparticles on the surface of the functionalized MWNTs by the hydrothermal treatment and utilized as the photocatalyst in the carbaryl degradation under both visible light and UV light irradiation. Visible-light-driven activity and enhanced UV-light-driven activity are both achieved as the composite MWNTs with TiO2can efficiently enhance the light absorption and charge separation and then photocatalytic activity. The photodegradation efficiency of carbaryl was examined by HPLC and IC techniques, which demonstrates that carbaryl can be readily degraded under visible light irradiation. Based on the obtained experimental results, assisted with the computer simulation of carbaryl molecule on PM3 level, it is presumed that the degradation of carbaryl starts with the break of N21-C23 and C19-N21 bonds and ends in the generation of naphthalen-1-ol before the ring-opening reaction.

Retracted Article: Synthesis of Fe3+-incorporated open-framework gallium borate catalyst for photocatalytic CO2 reduction driven by visible light irradiation

2018 ◽  
Author(s):  
Qiaoqi Li ◽  
Lili Zhang ◽  
Pu Su Zhao ◽  
Jingzhou Yin ◽  
Jun Xia ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Uv Light ◽  
Co2 Reduction ◽  
Light Irradiation ◽  
Relevant Study ◽  
Open Framework ◽  
Uv Light Irradiation ◽  
Retracted Article

Gallium borates semiconductors have been developed as effective photocatalysts for water splitting driven by UV light irradiation, but there is no relevant study for the CO2 photoreduction application. Herein, we...

Synthesis and Photocatalytic Activities of Bamboo-Like FeVO4 Nanocrystalline

2017 ◽  
Vol 46 ◽  
pp. 123-134 ◽  
Author(s):  
Guo Qiang Tan ◽  
Chi Xu ◽  
Hui Jun Ren ◽  
Wei Yang ◽  
Cheng Cheng Zhao ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Degradation Rate ◽  
Energy Gap ◽  
Hydrothermal Reaction ◽  
Uv Light ◽  
Light Irradiation ◽  
Molar Ratio ◽  
Microwave Hydrothermal ◽  
Photocatalytic Activities

The bamboo-like FeVO4 nanocrystallines were synthesized by a two-step method of the microwave hydrothermal-calcination, using Fe (NO3)3·9H2O and NH4VO3 as raw materials. The physical and photophysical properties of the as-prepared photocatalysts were fully characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), UV-vis diffuse reflectance spectra and photoluminescence (PL) analysis. The photocatalytic activities were evaluated by the decolorization of RhB solution under UV and visible light irradiation. The results reveal that the precursor solution concentration is 0.15 mol/L, the molar ratio n (Fe)/n (V) is 1, pH=3.0. The microwave hydrothermal reaction is at 180 °C for 120 min and then calcinated under 550 °C for 3 h so as to obtain the triclinic FeVO4 nanocrystalline. Along [120] and [110], the fore and aft phases of the crystal orientation are bonded self-assembly to grow into the bamboo-like nanocrystalline with the energy gap of 2.42 eV. Under the UV-light irradiation for 240 min, the degradation rate of RhB is up to 91.2%. Adding 0.1 mL H2O2 to the solution, the out-phase photo-fenton reaction occurs and the degradation rate to RhB can reach to 98.8% after 8 h visible-light irradiation.

scholarly journals Synthesis, Property Characterization, and Photocatalytic Activity of Novel Visible Light-Responsive Photocatalyst

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Jingfei Luan ◽  
Zhitian Hu
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Visible Light Irradiation ◽  
Textile Industry ◽  
Complete Removal ◽  
Order Rate Constant ◽  
Solid State Reaction Method ◽  
Lattice Parameter ◽  
Light Irradiation ◽  
First Order

Fe2BiSbO7was synthesized by a solid-state reaction method for the first time. The structural and photocatalytic properties of Fe2BiSbO7have been characterized. The results showed that Fe2BiSbO7was crystallized with the pyrochlore-type structure, cubic crystal system, and space groupFd3m. The lattice parameter for Fe2BiSbO7was  Å. The photocatalytic degradation of methylene blue (MB) was realized under visible light irradiation with Fe2BiSbO7as catalyst. Fe2BiSbO7owned higher catalytic activity compared with Bi2InTaO7or pure TiO2or N-doped TiO2for photocatalytic degradation of MB. The photocatalytic degradation of MB with Fe2BiSbO7, Bi2InTaO7, or N-doped TiO2followed the first-order reaction kinetics, and the first-order rate constant was 0.01189, 0.00275, or 0.00333 min−1. After visible light irradiation for 230 min with Fe2BiSbO7, complete removal and mineralization of MB was observed. The reduction of the total organic carbon, the formation of inorganic products, and , and the evolution of CO2revealed the continuous mineralization of MB during the photocatalytic process. The photocatalytic degradation pathway of MB was obtained. Fe2BiSbO7/(visible light) photocatalysis system was found to be suitable for textile industry wastewater treatment.

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