Synthesis of gallium bearing magnetic particles from aqueous solution: influence of mixing procedure of initial solution and the ratio of Ga/Fe

A chitosan magnetic membrane was prepared in order to confer magnetic properties to the membrane, which could be used for the removal of cations from aqueous solution. The crosslinked magnetic membrane was compared with pristine chitosan membrane in term of stability, morphology and cation adsorption capacity. The fabricated magnetic materials are thermally stable as shown by thermogravimetric curves. The membrane containing nickel magnetic particles (CHNiF-G) shows high thermal stability compared to the other membranes. The Fourier transform infrared spectroscopy showed successful preparation of chitosan magnetic membrane. Scanning electron microscopy micrographs showed the rough surface of the membrane with increased porosity. The prepared chitosan membranes were applied to cations of copper, nickel and lead in dilute aqueous solution. The chitosan membrane showed the following adsorption order for metallic cations: Cu2+ > Ni2+ > Pb2+, while CHNiF-G showed higher capacity, 3.51 mmol g−1 for copper, reflecting the improvement in adsorption capacity, since the amount of copper on pristine chitosan gave 1.40 mmol g−1. The time required for adsorption to reach to the equilibrium was 6 h for the selected cations using different chitosan membranes. The kinetic study showed that adsorption followed pseudo-second order kinetics. The most commonly used isotherm models, Freundlich, Langmuir and Temkin, were applied to experimental data using linear regression technique. However, The Temkin model fits better to experimental data.

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Magnetic particles precipitated onto wheat husk for removal of methyl blue from aqueous solution

Toxicological and Environmental Chemistry ◽

10.1080/02772248.2014.929690 ◽

2014 ◽

Vol 96 (2) ◽

pp. 218-226 ◽

Cited By ~ 18

Author(s):

Jasmin Shah ◽

M. Rasul Jan ◽

Sobia Jamil ◽

Atta ul Haq

Keyword(s):

Aqueous Solution ◽

Magnetic Particles ◽

Methyl Blue ◽

Wheat Husk

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The stability of a colloidal suspension of coated magnetic particles in an aqueous solution

IBM Journal of Research and Development ◽

10.1147/rd.291.0011 ◽

1985 ◽

Vol 29 (1) ◽

pp. 11-17 ◽

Cited By ~ 24

Author(s):

Derek Y. C. Chan ◽

Douglas Henderson ◽

Jorge Barojas ◽

Andrew M. Homola

Keyword(s):

Aqueous Solution ◽

Magnetic Particles ◽

Colloidal Suspension ◽

The Stability

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Metal Adsorbent Prepared from Coir Pith as Agricultural Waste: Adsorption of Zn(II) and Pb(II) from Aqueous Solution

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.545.101 ◽

2013 ◽

Vol 545 ◽

pp. 101-108 ◽

Cited By ~ 1

Author(s):

Kitirote Wantala ◽

Nusavadee Pojananukij ◽

Pongsert Sriprom ◽

Tinnakorn Kumsaen ◽

Arthit Neramittagapong ◽

...

Keyword(s):

Aqueous Solution ◽

Adsorption Capacity ◽

Calcination Temperature ◽

Ph Value ◽

Agricultural Waste ◽

Initial Solution ◽

Order Kinetic ◽

Solution Ph ◽

Freundlich Isotherms ◽

Coir Pith

Adsorption of Zn(II) and Pb(II) from aqueous solution were studied by using modified coir pith as an adsorbent. The extended adsorption conditions were investigated as a function of calcination temperature, contact time, adsorbent size, initial pH of solution and initial Zn(II) and Pb(II) concentrations. The adsorption capacity increased rapidly in first 5 minute and reached equilibrium in 120 minutes for Zn(II) and 10 minutes for Pb(II). In case of Zn(II); the results showed that the calcination temperature of modified coir pith above 600oC gave the higher adsorption capacity. The sizes of modified coir pith have no effect on the adsorption capacity. The adsorption capacity increased with increasing initial solution pH value. In case of Pb(II); the calcination temperature of modified coir pith showed no effect on the adsorption capacity. The sizes of modified coir pith showed a little effect on the adsorption capacity. The adsorption capacity increased with increasing of initial solution pH value up to pH of 3 and then stable. The results also corresponded with the Langmuir and Freundlich isotherms and pseudo second order kinetic adsorption models. The modified coir pith gave a higher Zn(II) and Pb(II) adsorption capacity of 29.33 mg Zn(II)/g adsorbent and 36.50 mg Pb(II)/g adsorbent, respectively.

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Research of Regularities of Aerosol Synthesis of Iron Oxide Particles

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.822.327 ◽

2019 ◽

Vol 822 ◽

pp. 327-333

Author(s):

E.N. Chapalda ◽

Sergey E. Aleksandrov ◽

Ewelina Kucal

Keyword(s):

Aqueous Solution ◽

Iron Oxide ◽

Spray Pyrolysis ◽

Ultrasonic Spray Pyrolysis ◽

Initial Solution ◽

Iron Oxide Particles ◽

Crystalline Inclusions ◽

Ultrasonic Spray ◽

Oxide Particles ◽

Average Size

The influence of the concentration of the initial solution on the size and composition of the particles obtained by the method of ultrasonic spray pyrolysis (USP) was investigated. An aqueous solution of Fe (NО3)3·9Н2О, the concentration of which varied in the range of 0,0025–0,03 mol/l, was used as the starting material. As a result of the process, iron oxide particles were obtained, the average size of which varied from 123 to 292 nm. Based on FTIR and XRD, powders consist of several phases and have crystalline inclusions α-Fe2O3, β-Fe2O3, and γ-Fe2O3.

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Surface modification of bacterial magnetic nanoparticles using artificial polypeptides consisting of a repeated asparagine-serine dipeptide and a transmembrane peptide

MRS Proceedings ◽

10.1557/opl.2012.1468 ◽

2012 ◽

Vol 1464 ◽

Author(s):

Toru Honda ◽

Tomoko Yoshino ◽

Tsuyoshi Tanaka ◽

Tadashi Matsunaga

Keyword(s):

Aqueous Solution ◽

Surface Modification ◽

Magnetic Nanoparticles ◽

Magnetic Particles ◽

Specific Binding ◽

Nanoparticle Surface ◽

New Strategy ◽

Modification Technique ◽

Bacterial Magnetic Particles ◽

Nanoparticle Surface Modification

ABSTRACTSurface modification is an important part of fabricating nanoparticles with specific properties and functions. We have designed a dipeptide, which we call NS polypeptide, that consists of four asparagine (N) residues and one serine (S) residue, as a molecule for nanoparticle surface modification. Surface modification of magnetic nanoparticles with the NS polypeptide results in reduction of particle-particle and particle-cell interactions. Here, we describe the surface modification and functionalization of bacterial magnetic particles (BacMPs) by spontaneous integration of temporin L conjugated to NS polypeptide. BacMP membranes were modified temporin L. Furthermore, peptide-modified BacMPs showed high dispersibility in aqueous solution compared to unmodified BacMPs. This surface modification technique may represent a new strategy for reducing non-specific binding of nanoparticles to proteins or cells for use in a variety of protein- or cell-associated applications.

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Application of magnetic particles modified with amino groups to adsorb copper ions in aqueous solution

Journal of Environmental Sciences ◽

10.1016/s1001-0742(10)60371-3 ◽

2011 ◽

Vol 23 (1) ◽

pp. 44-50 ◽

Cited By ~ 78

Author(s):

Yafen Lin ◽

Huawei Chen ◽

Kaelong Lin ◽

Boryann Chen ◽

Chyowsan Chiou

Keyword(s):

Aqueous Solution ◽

Magnetic Particles ◽

Copper Ions ◽

Amino Groups

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STABILITY OF FOAMS CONTAINING DIESIL FUEL

IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA ◽

10.6060/tcct.20186106.5361 ◽

2018 ◽

Vol 61 (6) ◽

pp. 48

Author(s):

Natalya G. Vilkova ◽

Svetlana I. Mishina ◽

Olga V. Dorchina

Keyword(s):

Aqueous Solution ◽

Interfacial Tension ◽

Diesel Fuel ◽

Organic Liquid ◽

Applied Pressure ◽

Sodium Dodecylsulfate ◽

Initial Solution ◽

Comparative Characteristic ◽

Ionic Surfactant ◽

The Stability

The comparative characteristic of the stability of foams formed by sodium dodecylsulfate and gelatin at their various concentrations at the presence of the diesel fuel under the action of an applied pressure drop was carried out in this work. It was shown that the change in the gelatin/ surfactant ratio in the initial solution changed the stability of such foams at the presence of an organic liquid. The surfactant and protein concentrations when these dispersions are more stable at the presence of the organic phase were determined. The isolated foam films obtained from a solution of sodium dodecyl sulfate + gelatin / diesel fuel were studied. It was shown that there was no correlation between the stability of the isolated film and the foam under the action of applied pressure drops: the films in contact with diesel fuel retained considerable stability, unlike the foams obtained from this aqueous solution of gelatin and surfactant in the presence of said organic substance. The coefficients of initial spreading of diesel fuel on the surface of an aqueous solution containing gelatin and surfactant were calculated. The change in the interfacial energy at the interface of the aqueous solution of sodium dodecylsulfate + gelatin/ diesel fuel with time when changing of the surfactant: protein ratio in the initial solution and different concentrations of the organic liquid was investigated. The change in the interfacial tension at the interface of the aqueous solution of sodium dodecylsulfate + gelatin/ diesel fuel over time was accompanied by a significant decrease in the stability of foams obtained from aqueous solutions containing gelatin and an ionic surfactant. If the interfacial tension did not change or slightly decreased, the foams containing diesel fuel remained stable.Forcitation:Vilkova N.G., Mishina S.I., Dorchina O.V. Stability of foams containing diesil fuel. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 6. P. 48-53

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Adsorption of crystal violet from aqueous solution onto sugarcane bagasse: central composite design for optimization of process variables

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2012.008 ◽

2012 ◽

Vol 2 (1) ◽

pp. 55-65 ◽

Cited By ~ 8

Author(s):

Sagnik Chakraborty ◽

Shamik Chowdhury ◽

Papita Das Saha

Keyword(s):

Aqueous Solution ◽

Central Composite Design ◽

Sugarcane Bagasse ◽

Crystal Violet ◽

Agitation Speed ◽

Initial Solution ◽

Optimum Conditions ◽

Solution Ph ◽

Central Composite ◽

Adsorbent Dose

The adsorption of crystal violet (CV) from aqueous solution by sugarcane bagasse (SCB), an agro-industrial residue, was investigated in a batch experimental setup. A two level four factor (24) full factorial central composite design (CCD) with the help of Design Expert Version 7.1.6 (Stat-Ease, USA) was used for adsorption process optimization and evaluation of interaction effects of different operating parameters: agitation speed (80–180 rpm), initial solution pH (4.0–8.0), initial dye concentration (100–200 mg L–1), and adsorbent dose (2–5 g L–1). A multiple coefficient of determination (R2) value of 0.98, model F value of 266.36 and its low P-value (<0.0001) along with lower value of coefficient of variation (2.70%) indicated the fitness of the response surface quadratic model developed during the present study. Numerical optimization applying desirability function was used to identify the optimum conditions for maximum removal of CV. The optimum conditions were found to be agitation speed = 165 rpm, initial solution pH = 8.0, initial dye concentration = 200 mg L–1 and adsorbent dose = 2.0 g L–1. A confirmatory experiment was performed to evaluate the accuracy of the optimization procedure and maximum CV removal of 93.21% was achieved under the optimized conditions.

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Modification of granular activated carbon using low molecular weight polymer for enhanced removal of Cu2 + from aqueous solution

Water Science & Technology ◽

10.2166/wst.2007.682 ◽

2007 ◽

Vol 56 (9) ◽

pp. 95-101 ◽

Cited By ~ 6

Author(s):

C.Y. Yin ◽

M.K. Aroua ◽

W.M.A.W. Daud

Keyword(s):

Aqueous Solution ◽

Activated Carbon ◽

Freundlich Isotherm ◽

Initial Solution ◽

Batch Adsorption ◽

Solution Ph ◽

Molecular Weight Polymer ◽

Adsorption Capacities ◽

Surface Impregnation ◽

Better Than

Palm shell activated carbon was modified via surface impregnation with polyethyleneimine (PEI) to enhance removal of Cu2 + from aqueous solution in this study. The effect of PEI modification on batch adsorption of Cu2 + as well as the equilibrium behavior of adsorption of metal ions on activated carbon were investigated. PEI modification clearly increased the Cu2 + adsorption capacities by 68% and 75.86% for initial solution pH of 3 and 5 respectively. The adsorption data of Cu2 + on both virgin and PEI-modified AC for both initial solution pH of 3 and 5 fitted the Langmuir and Redlich–Peterson isotherms considerably better than the Freundlich isotherm.

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