Modified chitosan gel incorporated with magnetic nanoparticle for removal of Cu(II) and Cr(VI) from aqueous solution

Anush, S.M.; Vishalakshi, B.

doi:10.1016/j.ijbiomac.2019.04.179

Cited by 71 publications

(19 citation statements)

References 50 publications

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“…In case of biomedical field, the Fe 3 O 4 can be used as contrast agent materials for magnetic resonance imaging (MRI), magnetic carrier for targeting drug delivery system, and heat generator in magnetic hyperthermia system (Ghazanfari, et al, 2016;Revia & Zhang, 2016), target-specific cell internalization carrier for chemotherapy (Mohammad, et al, 2017). In the field of environmental protection, the Fe 3 O 4 with its modification has been applied as removal agent of petroleum oil from contaminated waters and soil (Murgueitio, et al, 2018) and as an adsorbent for heavy metal removal (Anush & Vishalakshi, 2019).…”

Section: Introductionmentioning

confidence: 99%

A COMPREHENSIVE STUDY ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF Fe3O4 NANOPARTICLES BY VARIATION OF TEMPERATURE AND NaOH CONCENTRATION

Indrayana

2019

JoP

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This work was aimed at optimizing the microstructure and optical properties of Fe3O4 by variation of synthesis temperature and NaOH concentration. The nanoparticles have been synthesized from iron sand by using the coprecipitation method. The temperature was varied of 60oC, 80oC, and 100oC, while NaOH concentration was 3 molar, 5 molar, and 7 molars. The microstructural parameters were characterized by using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) techniques. The optical properties were characterized by using Fourier Transform Infrared Spectroscopy (FTIR) and UV-Vis Spectroscopy, consecutively. The results showed that the crystallite size of Fe3O4 increase with an increase of synthesis temperature due to higher thermal energy driving the nucleation process. The crystallite sizes are in the range of 3.77 nm – 20.37 nm. Increasing NaOH concentration also affected the increase in crystallite sizes. On the other hand, an excess of NaOH concentration influences the formation of smaller crystallite sizes of Fe3O4 with smaller crystal density and larger microstrain. The existence of Fe2+-O and Fe3+-O vibration in FTIR spectra confirmed the formation of Fe3O4 nanoparticles. The direct and indirect optical gap energies of Fe3O4 were in the range of 3.15 eV – 3.39 eV and 2.39 eV – 2.91eV. The synthesis temperature and NaOH concentration have a significant role in controlling the properties of Fe3O4.

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Section: Introductionmentioning

confidence: 99%

A COMPREHENSIVE STUDY ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF Fe3O4 NANOPARTICLES BY VARIATION OF TEMPERATURE AND NaOH CONCENTRATION

Indrayana

2019

JoP

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“…The maximum adsorption capacity of CA–PCL/CS nanofibers for the removal of Cr(VI) was 126 mg g −1 , which was higher than most of the reported adsorbents . The adsorption capacity of CA–PCL/CS nanofibers was as high as that of pure CS nanofibers reported in the literature .…”

Section: Resultsmentioning

confidence: 59%

Electrospun Cellulose Acetate–Polycaprolactone/Chitosan Core–Shell Nanofibers for the Removal of Cr(VI)

Shi

Zhang

et al. 2019

Physica Status Solidi (a)

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Core-shell-structured cellulose acetate-polycaprolactone/chitosan (CA-PCL/CS) nanofibers with excellent removal performance of hexavalent chromium (Cr(VI)) are developed by coaxial electrospinning. The effect of core-to-shell ratio on adsorption capability is studied. The results show that all core-shell-structured fibers possess higher adsorption capability and good durability in acidic environment compared with the CS powder adsorbent. CA-PCL/CS fibers with coreto-shell ratio of 0.442 have a maximum adsorption capability of 126 mg g À1 at room temperature. The adsorption kinetics reveals that chemisorption serves as the rate-determining step by notable electron transfer, share, or exchange between adsorbents and adsorbates. The adsorption equilibrium data of the core-shell-structured CA-PCL/CS fiber adsorbents are all well described by the Freundlich isotherm model, indicating the multilayer adsorption process. Herein, it is highlighted that the core-shell-structured CA-PCL/CS nanofibers have a promising prospect in removing Cr(VI) ions from waste water.

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“…As displayed in Figures 11 and 12, the results of the kinetic equation analysis showed that the adsorption data of chromium by nano chitin correspond to the pseudo-second-order model with R 2 ¼ 0.99. Thus, the adsorption data follow the pseudo-second order kinetic model (Omorogie et al 2016;Samuel et al 2018;Anush & Vishalakshi 2019;Li et al 2019;Samuel et al 2019).…”

Section: Models Of Adsorption Kineticsmentioning

confidence: 99%

Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies

Sheikhi

Rezaei

2021

Water Practice and Technology

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Treatment of the industrial wastewater before discharging into aquatic ecosystems using a new technology such as nanotechnology seems necessary. There are different methods for the removal of the heavy metals in the wastewater. In this study, nano-chitin was purchased from the Nano-Novin Polymer Company and used as an adsorbent for the removal of chromium (VI) ions from aqueous solution in a batch system. The effects of pH, temperature, contact time, concentration, and adsorbent dose were investigated. According to the results, the optimum conditions of adsorption occurred at pH = 6, temperature = 25 °C, 60 minute contact time, and 0.6 g·L−1 adsorbent dose. Investigation of equilibrium isotherms showed that the isotherm fitted the Freundlich model with a correlation coefficient of R2 = 0.9689. The pseudo second-order model with the larger correlation coefficient had a greater fitness against experimental data in the kinetic studies. Thermodynamic parameters such as Gibbs free energy, enthalpy, and entropy were calculated which indicated spontaneous, endothermic, and random processes, respectively. Given the good results of this project, nano-chitin can be suggested as a novel adsorbent which is highly capable of adsorbing hexavalent chromium from aqueous solutions.

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Modified chitosan gel incorporated with magnetic nanoparticle for removal of Cu(II) and Cr(VI) from aqueous solution

Cited by 71 publications

References 50 publications

A COMPREHENSIVE STUDY ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF Fe3O4 NANOPARTICLES BY VARIATION OF TEMPERATURE AND NaOH CONCENTRATION

A COMPREHENSIVE STUDY ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF Fe3O4 NANOPARTICLES BY VARIATION OF TEMPERATURE AND NaOH CONCENTRATION

Electrospun Cellulose Acetate–Polycaprolactone/Chitosan Core–Shell Nanofibers for the Removal of Cr(VI)

Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies

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