scholarly journals Synthesis, characterization and investigation of methyl orange dye removal from aqueous solutions using waterborne poly vinyl pyrrolidone (PVP) stabilized poly aniline (PANI) core–shell nanoparticles

RSC Advances ◽  
2017 ◽  
Vol 7 (34) ◽  
pp. 20960-20968 ◽  
Author(s):  
Anupama R. Prasad ◽  
Abraham Joseph
Keyword(s):  
Acidic Medium ◽  
Dye Removal ◽  
Chemical Oxidation ◽  
Vinyl Pyrrolidone ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Poly Vinyl Pyrrolidone ◽  
Core Shell Nanoparticles ◽  
Poly Aniline ◽  
Aqueous Acidic Medium

Waterborne polyaniline (PANI) core–shell nanoparticles were synthesizedviachemical oxidation of aniline in aqueous acidic medium using polyvinyl pyrrolidone (PVP) as stabilizer.

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 X-ray powder diffraction to analyse bimetallic core–shell nanoparticles (gold and palladium; 7–8 nm)

RSC Advances ◽  
2019 ◽  
Vol 9 (46) ◽  
pp. 26628-26636 ◽  
Author(s):  
A. Rostek ◽  
K. Loza ◽  
M. Heggen ◽  
M. Epple
Keyword(s):  
Gold Nanoparticles ◽  
Diffraction Study ◽  
Powder Diffraction ◽  
Au Nanoparticles ◽  
Vinyl Pyrrolidone ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
X Ray ◽  
Shell Nanostructures ◽  
Core Shell Nanoparticles

A comparative X-ray powder diffraction study on poly(N-vinyl pyrrolidone) (PVP)-stabilized palladium and gold nanoparticles and bimetallic Pd–Au nanoparticles (both types of core–shell nanostructures) was performed.

scholarly journals Removal of Synthetic Azo Dye Using Bimetallic Nickel-Iron Nanoparticles

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Shelby L. Foster ◽  
Katie Estoque ◽  
Michael Voecks ◽  
Nikki Rentz ◽  
Lauren F. Greenlee
Keyword(s):  
Dye Removal ◽  
Molar Ratio ◽  
Core Shell ◽  
Alloy Nanoparticles ◽  
Nanoparticle Concentration ◽  
Kinetic Rate Constant ◽  
Shell Nanoparticles ◽  
Kinetic Rate ◽  
Orange G ◽  
Core Shell Nanoparticles

Bimetallic nanoparticles comprised of iron (Fe) and nickel (Ni) were investigated for the removal of an azo dye contaminant in water. Morphology (core shell and alloy) and metal molar ratio (Ni2Fe10, Ni5Fe10, and Ni10Fe10) were tested as key nanoparticle properties. The shelf life of the nanoparticles was tested over a 3-week period, and the effect of initial nanoparticle concentration on dye removal was evaluated. The highest initial nanoparticle concentration (1000 mg/L) showed consistent Orange G removal and the greatest extent of dye removal, as compared to the other tested concentrations (i.e., 750 mg/L, 500 mg/L, and 250 mg/L) for the same nanoparticle morphology and metal molar ratio. The metal molar ratio significantly affected the performance of the core shell morphology, where overall dye removal was found to be 66%, 89%, and 98% with an increasing molar ratio (Ni2Fe10 → Ni5Fe10 → Ni10Fe10). In contrast, the overall removal of the dye for all molar ratios of the alloy nanoparticles only resulted in a variability of ±0.005%. When stored in water for 3 weeks, core shell nanoparticles lost reactivity with an average>17% loss in removal with each passing week. However, the alloy nanoparticles were able to continually remove Orange G from solution after 3 weeks of storage to ~97% when used at a starting nanoparticle concentration of 1000 mg/L. Overall, the Ni2Fe10, Ni5Fe10, and Ni10Fe10 alloy nanoparticles with a starting nanoparticle concentration of 1000 mg/L resulted in the greatest dye removal of 97%, 99%, and 98%, respectively. Kinetic rate models were used to analyze dye removal rate constants as a function of nanoparticle properties. Kinetic rate models were seen to differ from core shell (first-order kinetics) to alloy morphology (second-order kinetics). Alloy nanoparticles resulted in as high as X kinetic rate constant, and core shell nanoparticles resulted in as high as XX kinetic rate constant. Metal leaching from the nanoparticles was investigated; alloy nanoparticles resulted in leaching of 3% Fe and 5% Ni which is similar to core shell leaching of 3.2% Fe and 4.3% Ni from the Fe10Ni10 nanoparticles.

scholarly journals Polymer-Magnetic Composite Particles of Fe3O4/Poly(o-anisidine) and Their Suspension Characteristics under Applied Magnetic Fields

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 219 ◽  
Author(s):  
Jin Lee ◽  
Qi Lu ◽  
Jae Lee ◽  
Hyoung Choi
Keyword(s):  
Magnetic Field ◽  
Silicone Oil ◽  
Chemical Oxidation ◽  
Chain Structure ◽  
Core Shell ◽  
Magnetic Composite ◽  
Shell Nanoparticles ◽  
Shear Relaxation ◽  
Core Shell Nanoparticles ◽  
External Stimuli

Fe3O4/poly(o-anisidine) (POA) magnetic composite nanoparticles with their core-shell structure were synthesized by chemical oxidation polymerization technique and adopted as a magneto-responsive magnetorheological (MR) material. The chemical structure and morphology of core-shell nanoparticles were identified by FT-IR, SEM, TEM, and elemental analyzer. Pycnometer and vibrating sample magnetometer showed that the magnetic saturation and density of the Fe3O4/POA particles were reduced by the POA shell coatings. The rheological properties of the MR suspension dispersed in a silicone oil at various magnetic field strengths were investigated using a rotating rheometer under a magnetic field. The resulting MR suspension showed a typical Newtonian fluid behavior in the absence of external stimuli. When an external magnetic field was applied, it formed a strong chain structure, acting like a solid with a yield stress. Further solid-like behaviors were observed from storage shear relaxation and viscoelastic tests. Finally, the Fe3O4/POA nanoparticles showed better dispersion stability than pure Fe3O4 nanoparticles with 50% improvement.

Preparation and Electrocatalytic Performance of Thin-shell Ni/Pt Core-shell Nanoparticles

2012 ◽  
Vol 27 (1) ◽  
pp. 95-101
Author(s):  
Shi-Bin LIU ◽  
Chun-Ying YANG ◽  
Zhong-Lin ZHANG ◽  
Dong-Hong DUAN ◽  
Xiao-Gang HAO ◽  
...  
Keyword(s):  
Thin Shell ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Electrocatalytic Performance ◽  
Core Shell Nanoparticles

Pluronic-Based Core/Shell Nanoparticles for Drug Delivery and Diagnosis

2013 ◽  
Vol 20 (28) ◽  
pp. 3488-3499 ◽  
Author(s):  
Yon Jung ◽  
Hwanbum Lee ◽  
Jae Kim ◽  
Eun Koo ◽  
Keun Oh ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles
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