scholarly journals Enhancement of photo-driven biomethanation under visible light by nano-engineering of Rhodopseudomonas palustris

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Meng-Yuan Chen ◽  
Zhen Fang ◽  
Li-Xia Xu ◽  
Dao Zhou ◽  
Xue-Jin Yang ◽  
...  
Keyword(s):  
Solar Energy ◽  
Visible Light ◽  
Methane Production ◽  
Cell Damage ◽  
Rhodopseudomonas Palustris ◽  
Light Response ◽  
Great Promise ◽  
Hybrid Cells ◽  
Ambient Conditions ◽  
Visible Light Response

AbstractBiomethanation is of great interest as it can transform CO2 to methane under ambient conditions. In particular, genetically engineered bacterium of Rhodopseudomonas palustris showed great promise for one-step biomethanation powered by solar energy, which is attractive for CO2 fixation as well as solar energy storage. However, biomethanation with R. palustris under visible light is inefficient due to its poor visible light response. In this study, CdS quantum dots with excellent visible light response were prepared and R. palustris/CdS hybrid cells were constructed. Interestingly, this bio-nano-hybrid cells showed high cell viability without significant cell damage, and the biomethanation performance of was enhanced about ~ 79% compared to that of the bare R. palustris cells. Moreover, the effects of different parameters on the methane production of this bio-nano-hybrid cells were determined, and the methane production rate was further improved by parameter optimization. This work demonstrated an efficient approach to reinforce the biomethanation of bacteria under unfavorable light wavelength, which would be helpful to extend the light spectra for photo-driven biomethanation.

scholarly journals Simultaneously Enhanced Activity and Selectivity for C(sp3)–H Bond Oxidation Under Visible Light by Nitrogen Doping

2021 ◽  
Author(s):  
Tingting Hou ◽  
Zhuyan Gao ◽  
Jian Zhang ◽  
Nengchao Luo ◽  
Feng Wang
Keyword(s):  
Benzoic Acid ◽  
Visible Light ◽  
Selective Oxidation ◽  
Hydroxyl Radicals ◽  
Light Response ◽  
Ambient Conditions ◽  
Visible Light Response ◽  
Oxidation Of Hydrocarbons ◽  
Chemical Inertness ◽  
N Doping

AbstractSelective oxidation of saturated C(sp3)–H bonds in hydrocarbon to target chemicals under mild conditions remains a significant but challenging task because of the chemical inertness and high dissociation energy of C(sp3)–H bonds. Semiconductor photocatalysis can induce the generation of holes and oxidative radicals, offering an alternative way toward selective oxidation of hydrocarbons under ambient conditions. Herein, we constructed N-doped TiO2 nanotubes (N-TNTs) that exhibited remarkable activity and selectivity for toluene oxidation under visible light, delivering the conversion of toluene and selectivity of benzaldehyde of 32% and > 99%, respectively. Further mechanistic studies demonstrated that the incorporation of nitrogen induced the generation of N-doping level above the O 2p valance band, directly contributing to the visible-light response of TiO2. Furthermore, hydroxyl radicals generated by photogenerated holes at the orbit of O 2p were found to be unselective for the oxidation of toluene, affording both benzaldehyde and benzoic acid. The incorporation of nitrogen was able to inhibit the generation of hydroxyl radicals, terminating the formation of benzoic acid.

Toward Visible Light Response: Overall Water Splitting Using Heterogeneous Photocatalysts

Green ◽  
2011 ◽  
Vol 1 (4) ◽  
Author(s):  
Kazuhiro Takanabe ◽  
Kazunari Domen
Keyword(s):  
Solar Energy ◽  
Visible Light ◽  
Energy Conversion ◽  
Water Splitting ◽  
Large Scale ◽  
Light Response ◽  
Solar Flux ◽  
Powder Form ◽  
Overall Water Splitting ◽  
Visible Light Response

AbstractExtensive energy conversion of solar energy can only be achieved by large-scale collection of solar flux. The technology that satisfies this requirement must be as simple as possible to reduce capital cost. Overall water splitting by powder-form photocatalysts directly produces a mixture of H

Solution Processed Sb2S3-based Photocathode with Enhanced Photocatalytic Performance via Constructing Ultrathin TiO2 Overlayer and Noble Metal Modification

2021 ◽  
Author(s):  
Yanwen Wang ◽  
Rong Liang ◽  
Chao Qin ◽  
Lei Ren ◽  
Zhizhen Ye ◽  
...  
Keyword(s):  
Visible Light ◽  
Noble Metal ◽  
Photocatalytic Performance ◽  
Low Cost ◽  
Light Response ◽  
Solution Processed ◽  
Antimony Sulfide ◽  
Visible Light Response ◽  
Absorbing Material

Antimony sulfide (Sb2S3) is a light absorbing material with strong visible light response, which is suitable for efficient and low-cost photoelectrodes. Nano-structured films have unique advantages in constructing photoelectrodes due...

Multi-component in situ and in-step formation of visible-light response C-dots composite TiO2 mesocrystals

RSC Advances ◽  
2016 ◽  
Vol 6 (17) ◽  
pp. 14306-14313 ◽  
Author(s):  
Dong Yan ◽  
Yun Liu ◽  
Chun-yan Liu ◽  
Zhi-ying Zhang ◽  
Shi-dong Nie
Keyword(s):  
Carbon Source ◽  
Visible Light ◽  
Light Response ◽  
Visible Light Response

Successful in situ and in-step formation of C-dots composited TiO2 mesocrystals is closely related to the complexation between carbon source and Ti ion.

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