Synthesis of Ag3PO4 nanospheres for significant photocatalytic activity under direct sunlight irradiation

2017 ◽  
Vol 515 (1) ◽  
pp. 127-133
Author(s):  
Lei Xu ◽  
Qian Lang ◽  
Yiping Zhao ◽  
Wei Wang ◽  
Hao Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Direct Sunlight ◽  
Sunlight Irradiation

Photocatalytic Activity Inhibition by ZnO-SiO2 Nanocomposites Synthesized by Sonochemical Method

2015 ◽  
Vol 1112 ◽  
pp. 209-212 ◽  
Author(s):  
W. Widiyastuti ◽  
Iva Maula ◽  
Siti Machmudah ◽  
Tantular Nurtono ◽  
Sugeng Winardi ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Atmospheric Condition ◽  
Ultrasound Irradiation ◽  
Sonochemical Method ◽  
Direct Sunlight ◽  
Sunlight Irradiation ◽  
Activity Inhibition ◽  
Zno Particles ◽  
Spherical Structures ◽  
Blue Solution

Here, ZnO particles and ZnO-SiO2nanocomposites synthesized by sonochemical method under continuous ultrasound irradiation were reported. For an hour ultrasound irradiated by ultrasonic horn at atmospheric condition, nanorods and spherical structures with crystalline sizes 33 and 17 nm were obtained for ZnO and ZnO-SiO2, respectively, revealed that silica inhibited the particles and crystal growth. FTIR analysis also indicated that silica covered the ZnO particles. In addition, photocatalytic activity was also inhibited by silica in which ZnO without and with silica had degradation rate 69% and 48%, respectively, to degrade methylene blue solution under direct sunlight irradiation for an hour. The addition of SiO2to ZnO gives an advantage in some application to avoid excessive degradation by controlling their photocatalytic activity.

scholarly journals Heterostructure of Titanium Dioxide Nanotube/Graphene Nanoplatelet with Enhancing Photocatalytic Activity

2020 ◽  
Vol 36 (3) ◽  
Author(s):  
Vo Quang Mai ◽  
Vo Chi Hao ◽  
Nguyen Huu Tho ◽  
Nguyen Xuan Sang
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Sodium Hydroxide Solution ◽  
Optical Bandgap ◽  
Direct Sunlight ◽  
Graphene Nanoplatelet ◽  
Sunlight Irradiation ◽  
X Ray ◽  
Transmission Electron ◽  
Spectroscopy Optical

In this study, the composite of titanium dioxide nanotube (TNT) and graphene nanoplatelet was hydrothermally synthesized in a sodium hydroxide solution. Morphological and crystalline properties of the synthesized samples were analyzed by transmission electron microscopy (TEM), X-ray differactometry (XRD), and Raman spectroscopy. Optical properties were investigated by UV-Vis diffuse reflextance spectra (DRS) where optical bandgap was determined. Photocatalytic activity of the synthesized samples was evaluated through the degradation of methylene blue in the solution under direct sunlight irradiation. The result showed the enhancement of photocatalytic activity in the composite sample in compare to the bare TNT. After 120 min of irradiation, the photocatalytic efficiency of the composite and TNT was ~95% and 63%, respectively. Mechanism of enhanced activity was supported by DRS measurements in which the composite showed the higher visible light absoption and lower bandgap value. Optical bandgap of the sGr/TNT composite was about 3.25 eV which was notably reduced in compare to that of the bare TNT of ~3.68 eV.

CdS nanorods supported copper-nickel hydroxide for hydrogen production under direct sunlight irradiation

2021 ◽  
pp. 105670
Author(s):  
Imran Majeed ◽  
Ayesha Arif ◽  
Muhammad Faizan ◽  
Mohd Adnan Khan ◽  
Muhammad Imran ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Nickel Hydroxide ◽  
Direct Sunlight ◽  
Sunlight Irradiation ◽  
Copper Nickel ◽  
Cds Nanorods

The Study on the Influential Factors of Photocatalytic Performance of Eosin-Sensitized TiO2 Nanoparticles

2013 ◽  
Vol 827 ◽  
pp. 3-7
Author(s):  
Shun Jiang He ◽  
Xue Yan Du ◽  
Qiao Wang ◽  
Jing Xu
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Influential Factors ◽  
Sunlight Irradiation ◽  
Sensitization Time

The photocatalytic activity of eosin-sensitized TiO2 nanoparticles on photocatalytic degradation rate (PDR) of methyl orange under sunlight irradiation was studied. The influential factors on the degradation, such as eosin concentration, TiO2 dosage, sensitization time and sensitization temperature were also investigated. The results show that: The performance of TiO2 nanoparticles for PDR of methyl orange has been improved obviously for eosin sensitizing. The PDR of methyl orange reached 45.28% under the conditions of eosin concentration of 20mg/L, TiO2 dosage of 0.5000g/L, sensitization time of 24h and sensitization temperature of 20°C.

scholarly journals Sonochemical Synthesis of Copper-doped BiVO4/g-C3N4 Nanocomposite Materials for Photocatalytic Degradation of Bisphenol A under Simulated Sunlight Irradiation

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 498 ◽  
Author(s):  
Gang-Juan Lee ◽  
Xin-Yu Lee ◽  
Cong Lyu ◽  
Na Liu ◽  
Sambandam Andandan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Bisphenol A ◽  
Carbon Nitride ◽  
Ph Value ◽  
Nanocomposite Materials ◽  
Optimal Parameters ◽  
Electron Hole ◽  
Sunlight Irradiation ◽  
Pair Separation ◽  
Harvesting Efficiency

Copper-doped bismuth vanadate/graphitic carbon nitride (BiVO4/g-C3N4) nanocomposite materials were successfully fabricated using a sonochemical approach. Cu-doped BiVO4/g-C3N4 nanocomposite photocatalysts could improve electron/hole (e−/h+) pair separation, stability, and light-harvesting efficiency compared to pristine BiVO4 or g-C3N4, resulting in the enhancement of photocatalytic activity. The optimal parameters, such as pH value at 10, photocatalyst dosage of 0.4 g L−1, and 10 mol% Cu-doped BiVO4/g-C3N4 photocatalyst, were determined to degrade initial concentration of 20 ppm Bisphenol A, which could be completely removed after 90 min. Furthermore, the excessive doping of copper (> 10 mol%) could not synthesize the pure monoclinic scheelite phase, which substantially resulted in the reduction of the photocatalytic activity.

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