Full Solar‐Spectrum‐Driven Antibacterial Therapy over Hierarchical Sn 3 O 4 /PDINH with Enhanced Photocatalytic Activity

Small ◽  
2021 ◽  
pp. 2102744
Author(s):  
Ruiqi Yang ◽  
Guoxin Song ◽  
Longwei Wang ◽  
Zhongwei Yang ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Antibacterial Therapy ◽  
Solar Spectrum

scholarly journals The Influence of Calcination Temperature on Photocatalytic Activity of TiO2-Acetylacetone Charge Transfer Complex towards Degradation of NOx under Visible Light

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1463
Author(s):  
Lucas A. Almeida ◽  
Margarita Habran ◽  
Rafael dos Santos Carvalho ◽  
Marcelo E. H. Maia da Costa ◽  
Marco Cremona ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Visible Light ◽  
Calcination Temperature ◽  
Charge Transfer Complex ◽  
Light Exposure ◽  
Sol Gel ◽  
Solar Spectrum ◽  
Photocatalytic Efficiency ◽  
Nanocrystalline Tio2

The improvement of photocatalytic activity of TiO2-based nanomaterials is widely investigated due to the tentative of their industrialization as environmental photocatalysts and their inherently low solar spectrum sensitivity and rapid recombination of charge carriers. Coupling of oxygen-based bidentate diketone to nanocrystalline TiO2 represents a potential alternative for improving the holdbacks. Formation of TiO2-acetylacetone charge transfer complex (CTC) by sol-gel route results in a hybrid semiconductor material with photodegradation activity against toxic NOx gas. In this research, the influence of the chelating agent acetylacetone (ACAC) content on the CTC photocatalytic efficiency under visible light was evaluated. A high content of ACAC in the CTC is not a decisive factor for efficiency of photocatalytic reactions. In fact, the highest efficiency for NOx degradation (close to 100%, during 1 h of visible light exposure) was reported for the material calcined in air at 300 °C with the content of strongly bonded acetylacetone not higher than 3 wt.%. Higher calcination temperature (400 °C) left TiO2 almost completely depleted in ACAC, while at the highest applied temperature (550 °C) a portion of anatase was transformed into rutile and the sample is free of ACAC. The analyses pointed out that superoxide anion radical (O2−) plays an active role in photo-oxidation of NOx. Our findings indicate that this CTC has both high visible light spectral sensitivity and photocatalytic efficiency.

Characterization and Photocatalytic Evaluation (UV-Visible) of Fe-doped TiO2 Systems Calcined at Different Temperatures

2015 ◽  
Vol 18 (1) ◽  
Author(s):  
Ximena María Vargas ◽  
Juan Miguel Marin ◽  
Gloria Restrepo
Keyword(s):  
Photocatalytic Activity ◽  
Solar Spectrum ◽  
Doped Tio2 ◽  
Different Temperatures ◽  
Uv Visible ◽  
Intense Research

AbstractThere is growing interest in obtaining compounds with photocatalytic activity in the solar spectrum, and this has led to intense research on the topic. In our laboratory, Fe-doped TiO

Plasmon‐Enhanced Photocatalytic Activity of Organic Heterostructure for Indoor‐Light Antibacterial Therapy

2021 ◽  
pp. 2100202
Author(s):  
Hui‐Feng Jiao ◽  
Jiaxu Guo ◽  
Yuying Cui ◽  
Xin Yu ◽  
Yunfei Liao ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Antibacterial Therapy

Facile Synthesis of Ag-Coated Cu2O Nanospheres for Improved Photocatalytic Activity

2014 ◽  
Vol 1641 ◽  
Author(s):  
Drew Hall ◽  
Sanjay Mishra ◽  
Anagh Bhaumik ◽  
Kartik Dr. Ghosh
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Lower Energy ◽  
Ostwald Ripening ◽  
Solar Spectrum ◽  
Hollow Nanospheres ◽  
Facile Synthesis ◽  
Resonance Effects ◽  
Morphology And Structure ◽  
Energy Portion

ABSTRACTThe present study details facile synthesis of hollow Cu2O nanospheres decorated with Ag nanoparticles using a simple surfactant technique for enhanced photocatalytic activity. The morphology and structure is studied via XRD and SEM. Cu2O hollow nanospheres with a diameter of 500-800 nm were synthesized via Ostwald ripening using CuSO4 aqueous solution. The catalytic activity of Cu2O is studied in the presence of UV and visible light using Methyl Orange (MO) as a model pollutant. Ag decorated Cu2O particles showed a 49% increase in photocatalytic activity over the undecorated Cu2O. The improved photocatalytic activity is achieved by surface plasmon resonance effects in the silver nanoparticles, allowing utilization of the lower energy portion of the solar spectrum.

scholarly journals Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

2018 ◽  
Vol 9 ◽  
pp. 1448-1470 ◽  
Author(s):  
Rashmi Acharya ◽  
Brundabana Naik ◽  
Kulamani Parida
Keyword(s):  
Photocatalytic Activity ◽  
Active Sites ◽  
Noble Metals ◽  
Chemical Reduction ◽  
Solar Spectrum ◽  
Photocatalytic Reduction ◽  
Bacterial Degradation ◽  
Aqueous Environment ◽  
Intensity Increase ◽  
Aquatic Life

Cr(VI) exhibits cytotoxic, mutagenic and carcinogenic properties; hence, effluents containing Cr(VI) from various industrial processes pose threat to aquatic life and downstream users. Various treatment techniques, such as chemical reduction, ion exchange, bacterial degradation, adsorption and photocatalysis, have been exploited for remediation of Cr(VI) from wastewater. Among these, photocatalysis has recently gained considerable attention. The applications of photocatalysis, such as water splitting, CO2 reduction, pollutant degradation, organic transformation reactions, N2 fixation, etc., towards solving the energy crisis and environmental issues are briefly discussed in the Introduction of this review. The advantages of TiO2 as a photocatalyst and the importance of its modification for photocatalytic reduction of Cr(VI) has also been addressed. In this review, the photocatalytic activity of TiO2 after modification with carbon-based advanced materials, metal oxides, metal sulfides and noble metals towards reduction of Cr(VI) was evaluated and compared with that of bare TiO2. The photoactivity of dye-sensitized TiO2 for reduction of Cr(VI) was also discussed. The mechanism for enhanced photocatalytic activity was highlighted and attributed to the resultant properties, namely, effective separation of photoinduced charge carriers, extension of the light absorption range and intensity, increase of the surface active sites, and higher photostability. Advantages and limitations for photoreduction of Cr(VI) over modified TiO2 are depicted in the Conclusion. The various challenges that restrict the technology from practical applications in remediation of Cr(VI) from wastewater were addressed in the Conclusion section as well. The future perspectives of the field presented in this review are focused on the development of whole-solar-spectrum responsive, TiO2-coupled photocatalysts which provide efficient photocatalytic reduction of Cr(VI) along with their good recoverability and recyclability.

Preparation and Visible Light Photocatalytic Activity of Bi2WO6 Hollow Microspheres

2013 ◽  
Vol 864-867 ◽  
pp. 1323-1326
Author(s):  
Ming Sheng Gui ◽  
Peng Fei Wang ◽  
Ji Gang Yuan ◽  
Yan Qing Li ◽  
Wen Gang Zeng
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Solar Spectrum ◽  
Complex Oxides ◽  
The Past ◽  
Excellent Photocatalytic Activity ◽  
Visible Light Driven ◽  
Photoinduced Hydrophilicity ◽  
Visible Light Photocatalytic ◽  
Degradation Of Pollutants

Photocatalytic technology as a means of degradation of pollutants had been widespread concerned. In the past three decades, titanium dioxide (TiO2) has become one of the most extensively studied metal oxides because of its excellent photocatalytic activity and photoinduced hydrophilicity[1,. But TiO2only absorbs wavelengths in the near-UV region (λ<400nm), which is about 3% of the solar spectrum and 53% visible light was can not efficiently utilized for the degradation of organic pollutants. Therefore, it is crucial to explore visible-light-induced photocatalysts. In recent years, in addition to traditional oxides, some complex oxides have been found under visible light driven have a good photocatalytic activity, Such as, N-doped TiO2[, BiOX (X=Cl, Br, I)[, Bi2MoO6[and so on. Nevertheless, such efforts have not achieved satisfactory results aspects of making full use of the visible-light. Therefore, it is still a great challenge to design efficient visible-light driven photocatalysts.

scholarly journals Surface-sulfurized Ag2O nanoparticles with stable full-solar-spectrum photocatalytic activity

2017 ◽  
Vol 38 (6) ◽  
pp. 1063-1071 ◽  
Author(s):  
Haidong Li ◽  
Tinghan Chen ◽  
Yao Wang ◽  
Jianguo Tang ◽  
Yana Wang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Solar Spectrum ◽  
Ag2o Nanoparticles

New-Generation Oxide Semiconductors for Solar Energy Conversion and Environmental Remediation

2012 ◽  
Vol 17 ◽  
pp. 185-191 ◽  
Author(s):  
Krishnan Rajeshwar ◽  
Norma R. de Tacconi ◽  
Hari K. Timmaji
Keyword(s):  
Photocatalytic Activity ◽  
Solar Energy ◽  
Energy Conversion ◽  
Environmental Remediation ◽  
Solar Spectrum ◽  
Solution Combustion Synthesis ◽  
Solar Energy Conversion ◽  
Solution Combustion ◽  
Oxide Semiconductors ◽  
New Generation

Two Oxide Semiconductors, Namely, Bismuth Vanadate (BiVO4) and Silver Bismuth Tungstate (AgBiW2O8) Were Prepared by Solution Combustion Synthesis and their Attributes as Photocatalysts Were Comparatively Evaluated. A Key Conclusion of this Study Is that the Optical Characteristics Alone Provide only a Partial Glimpse into the Applicability of a Given Semiconductor for Solar Energy Conversion and Environmental Remediation. Thus while the Optical Bandgap of Bivo4 Is Lower than Agbiw2o8 (and Thus Is Able to Harness a Greater Portion of the Solar Spectrum), its Photocatalytic Activity for the Degradation of a Dye Is Inferior. this Finding Underlines the Fact that other Characteristics of the Semiconductor (band-Edge Alignment, Surface Quality Etc) Also Play as Critical a Role as the Optical Properties.

Synergetic effect of MoS2–RGO doping to enhance the photocatalytic performance of ZnO nanoparticles

2016 ◽  
Vol 40 (6) ◽  
pp. 5185-5197 ◽  
Author(s):  
Suneel Kumar ◽  
Vipul Sharma ◽  
Kaustava Bhattacharyya ◽  
Venkata Krishnan
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Zno Nanoparticles ◽  
Photocatalytic Performance ◽  
Synergetic Effect ◽  
Solar Spectrum

In this work, we report on the synergetic role played by MoS2–RGO doping in enhancing the photocatalytic activity of ZnO nanoparticles, especially in utilizing both the UV and the visible light regions of the solar spectrum.

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