Synthesis and characterization of chitosan-magnetic iron nanoparticles (original) (raw)
Related papers
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2008
Higher environmental standards have made for the removal of arsenic from water, an important problem for environmental engineering. Iron oxide is a particularly interesting sorbent to consider for this application. Its magnetic properties allow relatively routine dispersal and recovery of the adsorbent into and from groundwater or industrial processing facilities; in addition, iron oxide has strong and specific interactions with both As (III) and As(V). Finally, this material can be produced with nanoscale dimensions, which enhance both its capacity and removal. The present study focuses on iron-oxide based complexes that were found to adsorb arsenic from water. Their composition, morphology, magnetic behaviour and potential were studied by Fourier Transform Infra-Red (FTIR) Spectroscopy, X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), Zeta potential and Vibrating Sampling Magnetometer (VSM). Arsenic concentrations were recorded by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). Finally, the particles were also investigated for their antimicrobial properties that can be used against gram positive and gram-negative bacteria. The study suggests that among various iron oxide sorbents magnetite chitosan beads provides a low cost, fast and effective method for removal of arsenic from potable water, and thus making it suitable for drinking purpose.
Magnetic Chitosan Nanocomposites as Adsorbents in Industrial Wastewater Treatment: A Brief Review
Cellulose Chemistry and Technology, 2021
In recent decades, the increasing demand for chemicals has led to producing large volumes of wastewater streams, which should be treated before their release into the environment. Chitosan, a marine polysaccharide derived from chitin, has recently attracted great attention as a promising adsorbent to eliminate ionic dyes and metals from industrial waste streams. Nevertheless, chitosan has its drawbacks, such as its rather weak mechanical properties, low surface area and difficult separation from final streams. The incorporation of magnetic nanoparticles into chitosan may be considered as one of the most effective remedies for the mentioned challenges. This paper addresses the efforts that have been recently made for the application of magnetic nanoparticles/chitosan nanocomposites (MCNCs) as adsorbents in wastewater treatment. In this regard, the synthesis methods, physicochemical properties, and the effects of operational conditions on the performance of MCNCs have been reviewed. T...
Korean Journal of Chemical Engineering, 2015
Chitosan (CS)/iron oxide (Fe 3 O 4) composites were prepared using a chemical precipitation method. The CS/Fe 3 O 4 composite was characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and zeta-potential measurements. The composite was used to remove methyl orange (MO) dye from an aqueous solution. The factors affecting the adsorption capacity, such as adsorption time, absorbent dosage and solution pH were investigated. The results suggested that the composite was an effective adsorbent for the removal of MO dye from its aqueous solution. Kinetics studies showed that the adsorption process was consistent with a pseudo-second-order model. The adsorbent efficiency was unaltered, even after five cycles of reuse, and the adsorbent could be recollected easily using a magnet. In addition, the composite exhibited a superior antibacterial efficacy against Escherichia coli; 82% within 24 h, as measured by the colony forming units.
Removal of toxic metals from water using chitosan-based magnetic adsorbents. A review
Environmental Chemistry Letters, 2020
Environmental pollution by toxic metals causes serious health complications, thus requiring advanced remediation methods for waters and effluents. In particular, chitosan-based magnetic materials have been recently developed to remove metals from aqueous solutions, industrial wastewater and water from lakes and rivers. Here, we review the adsorption of lead (Pb), cadmium (Cd), mercury (Hg) and arsenic (As) using magnetic chitosan. The manuscript presents recent experimental findings on the synthesis of magnetic adsorbents, focusing on magnetization methods, the main aspects of adsorption and adsorbent regeneration. The major findings are: (1) Kinetic patterns are mostly correlated by pseudo-second-order equations. (2) Langmuir isotherm model provides satisfactory estimations of monolayer capacity, the highest reported values being 341.7 mg/g for lead, 152 mg/g for mercury, 321.9 mg/g for cadmium and 65.5 mg/g for arsenic. (3) Most magnetic chitosan-based adsorbents keep their magnetic features and adsorption efficiency in consecutive adsorption-desorption runs. Overall, most chitosan-based magnetic adsorbents provide effective uptake of toxic metals ions from aqueous media and have a high degree of reusability.
Journal of Molecular Liquids, 2016
Chitosan coated magnetic nanoparticles (CMNP), a novel adsorbent active under a robust range of environmental conditions of pH and temperature have been employed as an effective adsorbent for the removal of copper ions from the wastewater and later which can be easily separated from the aqueous solution via magnetic separation. The novelty of the present research is the incorporation of the growing field of nanotechnology in wastewater treatment by adsorption as well as use of magnetic particles as a carrier for the adsorbent for more effective separation of the adsorbent from wastewater, by the mere application of an external magnetic field. The CMNP particles have been characterized by Fourier Transform Infrared Spectroscopy (FTIR), Energy dispersive X-Ray analysis (EDAX), and vibrating sample magnetometer (VSM) analyses. The adsorption experimental data were analyzed by Langmuir, Freundlich, Redlich-Peterson, Koble-Corrigan, Sips, Toth, Temkin and Dubinin-Radushkevich isotherms. Thermodynamic parameters were also evaluated and the sorption process was found to be energetically feasible, spontaneous and exothermic in nature, suggesting that the adsorption of Cu(II) ions onto CMNP was presumably physisorption. The spent adsorbent can be easily regenerated by treating it with 0.1 N HCl/NaOH solution followed by vigorous agitation.
Water
In this work, we develop chitosan/xylan-coated magnetite (CsXM) nanoparticles as eco-friendly efficient adsorbents for the facile removal of contaminants from water. Characterization of CsXM using Fourier Transform Infra-Red (FTIR) Spectroscopy, Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), Thermogravimetric Analysis (TGA), Transmission Electron Microscopy (TEM), Zeta potential measurements, and Brunauer-Emmet-Teller (BET) analysis, confirmed the successful preparation of a chitosan/xylan complex coated over magnetite, which is characterized by being mesoporous, thermally stable and of neutral charge. Three contaminants, Pb(II), salicylic acid (SA), and congo red (CR), were chosen as representative pollutants from three major classes of contaminants of emerging concern: heavy metals, pharmaceuticals, and azo dyes. Pb(II), SA, and CR at initial concentrations of 50 ppm were removed by 64.49, 62.90, and 70.35%, respectively, on applying 6 g/L of CsXM. The contaminants w...
Chemical Methodologies, 2017
In the present research, a series of magnetic chitosan based composites with the general formula of NixMn1−xFe2O4/CS were synthesized from spinel-type transition metal ferrites [NixMn1−xFe2O4 (where x= 0, 0.2, 0.5 and 1.0)] and chitosan (CS) as a polymer. The structure and composition of the synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). The adsorption activity of the synthesized magnetic chitosan based composites was evaluated for the removal of Congo red (CR) dye from aqueous solution. Furthermore, the influence of the Mn content on adsorption capacity of the synthesized magnetic chitosan based composites were studied. The results of adsorption kinetic of CR dye using spinel-type transition metals NixMn1−xFe2O4 and NixMn1−xFe2O4/CS followed pseudo-second order model. The results indicated that 74% of CR dye solution were removed via adsorption using Ni0.5Mn0.5Fe2O4/CS after 180 min. The adsorption performance show that the chitosan based composites can be more efficient than spinel-type transition metals for removal of CR dye. Moreover, the magnetic chitosan based composites can be quickly separated from the aqueous solution by an external magnet after adsorption process.
Indonesian Journal of Chemical Studies, 2024
The synthesis of chitosan-modified silica-coated iron oxide magnetic material (Fe3O4/SiO2/Chitosan) via the sol-gel process addresses the need for enhanced stability and functionality in various applications. Coating iron oxide magnetic material with chitosan-modified silica is a common strategy to improve biocompatibility and performance. This study investigates the synthesis of Fe3O4/SiO2/Chitosan using sodium silicate as the silica precursor. The synthesis involved sonication of Fe3O4 and sodium silicate for 5 min, followed by adding chitosan in 4% acetic acid with continuous stirring. The mass ratio of Fe3O4:SiO2 was fixed at 0.5:0.73, with varying chitosan masses (0.025, 0.050, and 0.075 g). Characterization techniques used included Fourier-Transform Infrared Spectroscopy (FTIR), X-ray powder Diffraction (XRD), and Thermogravimetric analysis (TGA). The product with the highest mass yield was further analyzed. The variation in the amount of chitosan in the conducted research aimed to determine the optimum chitosan mass that could still bind to the silica framework. Magnetite was confirmed as the primary composition, with the addition of chitosan and silica functional groups observed through vibration absorption characteristics. Thermogravimetric analysis showed differences in decomposition patterns between samples. The optimal chitosan content for characterization was determined at 0.050 g. Future applications might include enhanced adsorption processes owing to the optimized structure and composition of Fe3O4/SiO2/Chitosan nanoparticles.
Chitosan-coated magnetic nanoparticles prepared in one step by reverse microemulsion precipitation
International journal of molecular sciences, 2013
Chitosan-coated magnetic nanoparticles (CMNP) were obtained at 70 °C and 80 °C in a one-step method, which comprises precipitation in reverse microemulsion in the presence of low chitosan concentration in the aqueous phase. X-ray diffractometry showed that CMNP obtained at both temperatures contain a mixture of magnetite and maghemite nanoparticles with ≈4.5 nm in average diameter, determined by electron microscopy, which suggests that precipitation temperature does not affect the particle size. The chitosan coating on nanoparticles was inferred from Fourier transform infrared spectrometry measurements; furthermore, the carbon concentration in the nanoparticles allowed an estimation of chitosan content in CMNP of 6%-7%. CMNP exhibit a superparamagnetic behavior with relatively high final magnetization values (≈49-53 emu/g) at 20 kOe and room temperature, probably due to a higher magnetite content in the mixture of magnetic nanoparticles. In addition, a slight direct effect of precipitation temperature on magnetization was identified, which was ascribed to a possible higher degree of nanoparticles crystallinity as temperature at which they are obtained increases. Tested for Pb 2+ removal from a Pb(NO 3 ) 2 aqueous solution, CMNP showed a recovery efficacy of 100%, which makes them attractive for using in heavy metals ion removal from waste water.
Highly efficient removal of heavy metals from waters by magnetic chitosan-based composite
Adsorption-journal of The International Adsorption Society, 2019
Magnetic chitosan composite (MCC) made by chitosan matrix embedding magnetite/maghemite were developed for the removal of toxic Cu(II), Pb(II), and Ni(II) from water. Thermogravimetric (TGA) and Zeta potential analyses showed that MCC contains ca. 50 wt % of chitosan and presents a value of isoelectric point (pH IEP) around 8-8.5. The magnetization curve revealed a saturation magnetization of 12 emu g −1 , which indicates that MCC can be easily recovered by magnetic separation. Adsorption of the heavy metals to MCC reached equilibrium within 120 min with maximum uptakes of 108.9 mg g −1 , 216.8 mg g −1 and 220.9 mg g −1 for Ni(II), Cu(II) and Pb(II), respectively. The results show that the amino and hydroxyl functional groups of chitosan are involved in the adsorption process. The reported adsorption capacity from organic pollutants, such as hydrocarbons, along with the high adsorption capacity shown for heavy metals, point out MCC being a promising versatile adsorbent for wastewater treatments.