Hybrid ZnO:Ag core-shell nanoparticles for wastewater treatment : Growth mechanism and plasmonically enhanced photocatalytic activity

2018 ◽  
Vol 456 ◽  
pp. 49-58 ◽  
Author(s):  
Jeevan Jadhav ◽  
Somnath Biswas
Keyword(s):  
Wastewater Treatment ◽  
Photocatalytic Activity ◽  
Growth Mechanism ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Dual-mode excitation β-NaGdF4:Yb/Er@β-NaGdF4:Yb/Nd core–shell nanoparticles with NIR-II emission and 5 nm cores: controlled synthesis via NaF/RE regulation and the growth mechanism

CrystEngComm ◽  
2020 ◽  
Vol 22 (38) ◽  
pp. 6330-6338
Author(s):  
Chunyan Cheng ◽  
Yueshan Xu ◽  
Gejihu De ◽  
Jianxun Wang ◽  
Wei Wu ◽  
...  
Keyword(s):  
Single Dose ◽  
Growth Mechanism ◽  
Core Shell ◽  
Controlled Synthesis ◽  
Dual Mode ◽  
Shell Nanoparticles ◽  
Mode Excitation ◽  
Core Shell Nanoparticles

Dual-mode excitation β-NaGdF4:Yb/Er@β-NaGdF4:Yb/Nd core–shell nanoparticles with NIR-II emission and 5 nm cores were synthesized using an ultra-low single dose of NaF.

Observing the Growth Mechanism of Au-ZnO Core-Shell Nanoparticles by In-Situ Liquid Cell TEM

2020 ◽  
Vol MA2020-01 (45) ◽  
pp. 2572-2572
Author(s):  
Shin-Bei Tsai ◽  
Chih-Yang Huang ◽  
Jui-Yuan Chen ◽  
Wen-Wei Wu
Keyword(s):  
Growth Mechanism ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Liquid Cell ◽  
Core Shell Nanoparticles

scholarly journals Synthesis and Photocatalytic Activity of Magnetically Recoverable Core-Shell Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Zhen Peng ◽  
Hua Tang ◽  
Yao Tang ◽  
Ke Fu Yao ◽  
Hong Hong Shao
Keyword(s):  
Photocatalytic Activity ◽  
High Efficiency ◽  
Sol Gel ◽  
High Photocatalytic Activity ◽  
Core Shell ◽  
Oily Wastewater ◽  
Strong Response ◽  
Shell Nanoparticles ◽  
Oil Concentration ◽  
Core Shell Nanoparticles

TiO2/SiO2/Fe3O4(TSF) core-shell nanoparticles with good photocatalytic activity that are capable of fast magnetic separation have been successfully prepared by chemical coprecipitation and two-step sol-gel process. The as-prepared TSF nanoparticles were calcined at high temperature in order to transform the amorphous titanium dioxide into a photoactive crystalline phase. The calcined nanoparticles are composed of a Fe3O4core with a strong response to external magnetic fields, a SiO2intermediary layer, and a TiO2outshell. Vibration sample magnetometer (VSM) analysis confirms the superparamagnetism of calcined nanoparticles, which can enhance the recoverable properties of the novel photocatalyst. When the TiO2/SiO2/Fe3O4core-shell nanoparticles are added to the crude oily wastewater, they exhibit high photocatalytic activity in the degradation of crude oily wastewater. The oil concentration could be reduced to lower than 30 ppm within 20 minutes for the case of initial oil concentration less than 350 ppm. It has been found that the TSF nanoparticles could be easily separated from the wastewater and withdrawn by using an external magnetic field. The recovered TSF nanoparticles possess high efficiency in the degradation of crude oily wastewater even after three times successive reuse. The present results indicate that TSF core-shell nanoparticles possess great application perspectives in the degradation of crude oily wastewater.

scholarly journals Optimization of Fe@Cu Core–Shell Nanoparticle Synthesis, Characterization, and Application in Dye Removal and Wastewater Treatment

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 755 ◽  
Author(s):  
Nkosinathi Goodman Dlamini ◽  
Albertus Kotze Basson ◽  
Shandu Jabulani Siyabonga Emmanuel ◽  
Viswanadha Srirama Rajasekhar Pullabhotla
Keyword(s):  
Electron Microscopy ◽  
Wastewater Treatment ◽  
River Water ◽  
Dye Removal ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Flocculation Activity ◽  
Core Shell Nanoparticles

Green synthesis of core–shell nanoparticles is gaining importance nowadays as it is viewed as being environmental friendly and cost effective. The present study aimed to synthesize iron@copper core–shell nanoparticles using a polysaccharide-based bioflocculant from Alcalegenis faecalis and to evaluate its efficiency in dye removal and river water and domestic wastewater treatment. The synthesized samples were characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, thermogravimetric analysis, transmission electron microscopy, and UV-Vis spectroscopy analysis. To optimize the best concentration for core–shell formation, different ratios of iron to copper were prepared. Sample 1 (S1) contained 1:3 iron to copper (Fe 25%–Cu 75%), sample 2 (S2) contained 1:1 iron to copper (Fe 50%–Cu 50%), and the third sample (S3) contained 3:1 iron to copper (Fe 75%–Cu 25%). The flocculation activity (FA) was above 98% at 0.2 mg/mL for all the samples and the samples flocculated well under acidic, alkaline, and neutral pH conditions. Sample 3 was shown to be thermostable, with flocculation activity above 90%, and samples 2 and 1 were also thermostable, but the flocculation decreased to 87 at 100 °C. All three samples revealed some remarkable properties for staining dye removal as the removal efficiency was above 89% for all dyes tested. The synthesized core–shell nanoparticles could remove nutrients such as total nitrogen and phosphate in both domestic wastewater and Mzingazi river water. Furthermore, high removal efficiency for chemical oxygen demand (COD) and biological oxygen demand (BOD) was also observed.

scholarly journals Morphology, Optical Properties and Photocatalytic Activity of Photo- and Plasma-Deposited Au and Au/Ag Core/Shell Nanoparticles on Titania Layers

Nanomaterials ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 502 ◽  
Author(s):  
Alexander Müller ◽  
Sandra Peglow ◽  
Michael Karnahl ◽  
Angela Kruth ◽  
Henrik Junge ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photocatalytic Activity ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

scholarly journals Synthesis and Characterization of Silver/Titanium dioxide Core-Shell Nanoparticles

1970 ◽  
Vol 3 (1) ◽  
pp. 21-24
Author(s):  
Suk Fun Chin ◽  
Suh Cem Pang ◽  
Freda Emmanuel Idely Dom
Keyword(s):  
Photocatalytic Activity ◽  
Ag Nanoparticles ◽  
Sol Gel ◽  
Model Reaction ◽  
Synthesis And Characterization ◽  
Core Shell ◽  
Particle Sizes ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Silver nanoparticles (AgNPs) with mean diameter of 150 nm were synthesized by using an aqueous-basedreduction method. Ascorbic acid and sodium hydroxide (NaOH) were used as a reducing agent and as acatalyst, respectively. These AgNPs were subsequently coated with a layer of TiO2 to form Ag/TiO2 core-shellnanoparticles by using a sol-gel method. The particle sizes and morphology of Ag/TiO2 core-shellnanoparticles were characterized using scanning electron microscopy (SEM) and transition electronmicroscopy (TEM). The photocatalytic activity of the Ag/TiO2 core-shell nanoparticles were evaluated basedon the degradation of methylene blue (MB) as the model reaction. The TiO2 coating has resulted in theenhanced photocatalytic activity of Ag nanoparticles as compared to bare Ag nanoparticles.

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