Core-shell Fe-SiO2-polyamine magnetic nanoparticles for metal recovery using a continuous flow pipeline reactor

2018 ◽  
Vol 90 (8) ◽  
pp. 1225-1235
Author(s):  
Emile Deluca ◽  
Ryan Latterman ◽  
Edward Rosenberg
Keyword(s):  
Infrared Spectroscopy ◽  
Magnetic Nanoparticles ◽  
Silica Gel ◽  
Amorphous Silica ◽  
Continuous Flow ◽  
Metal Ion ◽  
Magnetic Nanomaterials ◽  
Core Shell ◽  
Successful Development ◽  
Kinetics Of

Abstract A series of core-shell magnetic nanomaterials have been synthesized with the intent of applying them for metal ion capture in a newly designed pipeline reactor. The synthetic chemistry is an extension of a previously developed family of materials based on amorphous silica gel, which has been used in the mining and remediation industries. The nanoparticles were characterized by infrared spectroscopy and TEM and SEM techniques. The size of the starting magnetite core was critical to the behavior of the particles under metal sequestering conditions. The capture kinetics of the resulting nanoagregates is 10 times faster than related micro composites. All of the tests performed point to the future successful development of a technology that circumvents the disadvantages associated with the use of column based microparticles.

scholarly journals Synthesis of Silica Gel Supported Amidoxime Ligand for Adsorption of Copper and Iron from Aqueous Media

2019 ◽  
Vol 31 (12) ◽  
pp. 3035-3040
Author(s):  
Sazmal Effendi Arshad ◽  
Zarina Amin ◽  
Perng Yang Puah ◽  
Mohd Sani Sarjadi ◽  
Baba Musta ◽  
...  
Keyword(s):  
Metal Ions ◽  
Silica Gel ◽  
Metal Ion ◽  
Aqueous Media ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Multilayer Adsorption ◽  
Metal Ion Adsorption ◽  
High Metal ◽  
Kinetics Of

Organic-inorganic hybrid polymers have been demonstrated to be an efficient technique for the adsorption of pollutants present in water. Silica gel adsorbent has been applied in this field due to promising characters, such as thermally stable, reusability and high metal ion adsorption capacities. Here, silica gel supported acrylonitrile functional group (silica-APTS-DPN) was reacted with hydroxylamine to yield silica gel supported amidoxime ligand (SBA). All the functionalized silica gel adsorbents were characterized by FTIR. In terms of metal ions adsorption, SBA revealed good absorption capacities towards both copper (Cu2+) (172 mg g-1) and iron (Fe3+) (168 mg g-1) ions at pH 6 and followed the order of Cu2+ > Fe3+. Increased pH condition was beneficial for both metal ions adsorption. The adsorption kinetics of both ions followed the pseudo-first-order model within 0-60 min of adsorption time. Langmuir and Freundlich isotherm models were both applied to study the adsorption behaviour, Freundlich isotherm model (R2 > 0.99) proved to be a better fit, which propose that multilayer adsorption occurred on the silica gel grafted with amidoxime ligand. Finally, this study proved that the silica gel supported amidoxime ligand was successfully applied as an absorbent for the removal of both copper and iron from aqueous media.

scholarly journals Novel β-Cyclodextrin Functionalized Core-Shell Fe3O4 Magnetic Nanoparticles for the Removal of Toxic Metals from Water

2021 ◽  
Author(s):  
Babak Kaboudin ◽  
Torabi Momen ◽  
Foad Kazemi ◽  
Priyanka Ray
Keyword(s):  
Magnetic Nanoparticles ◽  
Metal Ion ◽  
Nitrogen Adsorption ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Core Shell ◽  
Fe3o4 Magnetic Nanoparticles ◽  
Ion Removal ◽  
Diffraction Patterns ◽  
Adsorption Desorption

Herein we report the synthesis and characterization of β-CD functionalized core-shell Fe3O4 magnetic nanoparticles which were used as an adsorbent for removal of Lead (II) and Copper (II) ions from aqueous solution. Various characterization techniques including FTIR, TGA analysis, SEM, TEM, X-Ray diffraction patterns (XRD) and nitrogen adsorption- desorption measurements were employed to investigate the properties of the synthesized material. The influence of pH, contact time, metal ion concentration, adsorbent dosage of Lead (II) and Copper (II) ion removal were also studied. The isotherm models for both ions showed a fit to the Langmuir model. Thermodynamic parameters such as enthalpy, entropy and Gibbs free energy were also evaluated and the negative values of ΔH for both Lead (II) and Copper (II) ions indicated the exothermic nature their sorption.

scholarly journals Novel β-Cyclodextrin Functionalized Core-Shell Fe3O4 Magnetic Nanoparticles for the Removal of Toxic Metals from Water

2021 ◽  
Author(s):  
Babak Kaboudin ◽  
Torabi Momen ◽  
Foad Kazemi ◽  
Priyanka Ray
Keyword(s):  
Magnetic Nanoparticles ◽  
Metal Ion ◽  
Nitrogen Adsorption ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Core Shell ◽  
Fe3o4 Magnetic Nanoparticles ◽  
Ion Removal ◽  
Diffraction Patterns ◽  
Adsorption Desorption

Herein we report the synthesis and characterization of β-CD functionalized core-shell Fe3O4 magnetic nanoparticles which were used as an adsorbent for removal of Lead (II) and Copper (II) ions from aqueous solution. Various characterization techniques including FTIR, TGA analysis, SEM, TEM, X-Ray diffraction patterns (XRD) and nitrogen adsorption- desorption measurements were employed to investigate the properties of the synthesized material. The influence of pH, contact time, metal ion concentration, adsorbent dosage of Lead (II) and Copper (II) ion removal were also studied. The isotherm models for both ions showed a fit to the Langmuir model. Thermodynamic parameters such as enthalpy, entropy and Gibbs free energy were also evaluated and the negative values of ΔH for both Lead (II) and Copper (II) ions indicated the exothermic nature their sorption.

Carbon tetrachloride biodegradation in a fixed-biofilm reactor and its kinetic study

1998 ◽  
Vol 38 (8-9) ◽  
pp. 155-162 ◽  
Author(s):  
G. Jin ◽  
A. J. Englande
Keyword(s):  
Carbon Tetrachloride ◽  
Continuous Flow ◽  
Model Comparison ◽  
Biofilm Reactor ◽  
Pseudomonas Cepacia ◽  
Initial Concentration ◽  
Biphasic Model ◽  
Providencia Stuartii ◽  
Kinetics Of ◽  
Fixed Biofilm

Kinetics of Carbon Tetrachloride biodegradation are evaluated in a continuous-flow fixed-biofilm reactor with controlled initial redox potential. The column was seeded with a mixed culture of indigenous microorganisms Pseudomonas cepacia and Providencia stuartii. The fixed biofilm reactor exhibited 98%–99.9% biodegradation of CT introduced into the reactor at an initial concentration of about 200 μg/l for retention times of 1 to 4 days respectively. Four models were employed to evaluate the kinetics of CT biodegradation. These included: Eckenfelder (1989), Arvin (1991), Bouwer and McCarty (1985) and a biphasic model. Comparison of calculated results with observed results between these models agreed very closely to each other (0.968 < R2 < 0.999). Predicted performance was best described by the model of Bouwer and McCarty (1985). However, the biphasic and Eckenfelder models provided excellent correlations and were much simpler to apply. The biphasic model yielded very good correlations of the data for all detention times evaluated; whereas, the Eckenfelder model effected comparable results only at the longer retention times studied.

Kinetics and mechanism of the reaction of iron(III) with 6-methyl-2,4-heptanedione and 3,5-heptanedione

1990 ◽  
Vol 55 (8) ◽  
pp. 1984-1990 ◽  
Author(s):  
José M. Hernando ◽  
Olimpio Montero ◽  
Carlos Blanco
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Activation Parameters ◽  
Enol Form ◽  
Kinetics And Mechanism ◽  
Kinetic Constants ◽  
Steric Factors ◽  
Kinetics Of ◽  
Mechanism Of The Reaction

The kinetics of the reactions of iron(III) with 6-methyl-2,4-heptanedione and 3,5-heptanedione to form the corresponding monocomplexes have been studied spectrophotometrically in the range 5 °C to 16 °C at I 25 mol l-1 in aqueous solution. In the proposed mechanism for the two complexes, the enol form reacts with the metal ion by parallel acid-independent and inverse-acid paths. The kinetic constants for both pathways have been calculated at five temperatures. Activation parameters have also been calculated. The results are consistent with an associative activation for Fe(H2O)63+ and dissociative activation for Fe(H2O)5(OH)2+. The differences in the results for the complexes of heptanediones studied are interpreted in terms of steric factors.

scholarly journals Investigating spin coupling across a three-dimensional interface in core/shell magnetic nanoparticles

2020 ◽  
Vol 4 (3) ◽  
Author(s):  
C. Kons ◽  
Manh-Huong Phan ◽  
Hariharan Srikanth ◽  
D. A. Arena ◽  
Zohreh Nemati ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Three Dimensional ◽  
Spin Coupling ◽  
Core Shell

Core-shell ZIF-8@polydopamine nanoparticles obtained by mitigating polydopamine coating induced self-etching of MOFs: prototypical metal ion reservoirs for sticking to and killing bacteria

2021 ◽  
Author(s):  
Yingxue Tu ◽  
Caifen Lei ◽  
Fei Deng ◽  
Yiang Chen ◽  
Ying Wang ◽  
...  
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Biomedical Applications ◽  
Metal Organic Frameworks ◽  
Core Shell ◽  
Metal Organic

Metal organic frameworks (MOFs) have the potential to boost the undervalued biomedical applications of metal ions. Such endeavor has been hindered by the challenge of how to avoid the (cyto)toxicity...

scholarly journals Magneto-Optical Characteristics of Streptavidin-Coated Fe3O4@Au Core-Shell Nanoparticles for Potential Applications on Biomedical Assays

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Chin-Wei Lin ◽  
Jian-Ming Chen ◽  
You-Jun Lin ◽  
Ling-Wei Chao ◽  
Sin-Yi Wei ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Faraday Effect ◽  
Au Nanoparticles ◽  
Optical Characteristics ◽  
Enzyme Linked Immunosorbent Assay ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Time Resolved ◽  
Biotechnology Research ◽  
Core Shell Nanoparticles

Abstract Recently, gold-coated magnetic nanoparticles have drawn the interest of researchers due to their unique magneto-plasmonic characteristics. Previous research has found that the magneto-optical Faraday effect of gold-coated magnetic nanoparticles can be effectively enhanced because of the surface plasmon resonance of the gold shell. Furthermore, gold-coated magnetic nanoparticles are ideal for biomedical applications because of their high stability and biocompatibility. In this work, we synthesized Fe3O4@Au core-shell nanoparticles and coated streptavidin (STA) on the surface. Streptavidin is a protein which can selectively bind to biotin with a strong affinity. STA is widely used in biotechnology research including enzyme-linked immunosorbent assay (ELISA), time-resolved immunofluorescence (TRFIA), biosensors, and targeted pharmaceuticals. The Faraday magneto-optical characteristics of the biofunctionalized Fe3O4@Au nanoparticles were measured and studied. We showed that the streptavidin-coated Fe3O4@Au nanoparticles still possessed the enhanced magneto-optical Faraday effect. As a result, the possibility of using biofunctionalized Fe3O4@Au nanoparticles for magneto-optical biomedical assays should be explored.

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