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Silica-coated magnetite nanoparticles core-shell spheres (Fe3O4@SiO2) for natural organic matter removal.
J Environ Health Sci Eng. 2016; 14:21.JE

Abstract

BACKGROUND

In this work, the magnetite (Fe3O4) nanoparticles (MNPs) and silica-coated magnetite nanoparticles (SMNPs) were synthesized as adsorbents for removing humic acid (HA) from water resources.

METHODS

The adsorption processes were performed in batch experiments with which the influence of pH, reaction time, adsorbent dosage, initial concentrations of HA and temperature were investigated. Specific techniques were applied to characterize the features of both adsorbents (i. e. TECHNIQUES) (SEM, XRD, TEM, BET, EDX and VSM).

RESULTS

The maximum saturation magnetization for SMNPs was 30.2 emu/g, which made its separation from the solution by a magnetic field to be easier and faster. The HA adsorption process onto the both adsorbents were best described by the Freundlich isotherm and pseudo-second-order kinetic models. Highest adsorption efficiency of HA by MNPs an d SMNPs occurred at acidic conditions (pH ≈ 3). The mechanisms of adsorption process involved with a physisorption process such as (i. e. hydrogen bonding and electrostatic interaction). The predicted maximum monolayer adsorption capacities obtained by Langmuir isotherm model for MNPs and SMNPs were 96.15 and 196.07 mg/g, respectively.

CONCLUSION

Higher amount of HA adsorption onto the surfaces of SMNPs than MNPs surfaces was observed, reflecting that silica impregnated on MNPs enhances the efficiency of the adsorbent in removing HA.

Authors+Show Affiliations

Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.Department of Environmental Health Engineering, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran ; Student Research Committee Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.Research Center for Environmental Health Technology (RCEHT), Iran University of Medical Sciences, Tehran, Iran ; Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran.Research Center for Environmental Health Technology (RCEHT), Iran University of Medical Sciences, Tehran, Iran ; Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27924220

Citation

Karimi Pasandideh, Elahe, et al. "Silica-coated Magnetite Nanoparticles Core-shell Spheres (Fe3O4@SiO2) for Natural Organic Matter Removal." Journal of Environmental Health Science & Engineering, vol. 14, 2016, p. 21.
Karimi Pasandideh E, Kakavandi B, Nasseri S, et al. Silica-coated magnetite nanoparticles core-shell spheres (Fe3O4@SiO2) for natural organic matter removal. J Environ Health Sci Eng. 2016;14:21.
Karimi Pasandideh, E., Kakavandi, B., Nasseri, S., Mahvi, A. H., Nabizadeh, R., Esrafili, A., & Rezaei Kalantary, R. (2016). Silica-coated magnetite nanoparticles core-shell spheres (Fe3O4@SiO2) for natural organic matter removal. Journal of Environmental Health Science & Engineering, 14, 21.
Karimi Pasandideh E, et al. Silica-coated Magnetite Nanoparticles Core-shell Spheres (Fe3O4@SiO2) for Natural Organic Matter Removal. J Environ Health Sci Eng. 2016;14:21. PubMed PMID: 27924220.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Silica-coated magnetite nanoparticles core-shell spheres (Fe3O4@SiO2) for natural organic matter removal. AU - Karimi Pasandideh,Elahe, AU - Kakavandi,Babak, AU - Nasseri,Simin, AU - Mahvi,Amir Hossein, AU - Nabizadeh,Ramin, AU - Esrafili,Ali, AU - Rezaei Kalantary,Roshanak, Y1 - 2016/11/25/ PY - 2016/07/09/received PY - 2016/11/10/accepted PY - 2016/12/8/entrez PY - 2016/12/8/pubmed PY - 2016/12/8/medline KW - Adsorption KW - Humic acid KW - Hybrid adsorbent KW - Magnetic separation KW - Silica-magnetite SP - 21 EP - 21 JF - Journal of environmental health science & engineering JO - J Environ Health Sci Eng VL - 14 N2 - BACKGROUND: In this work, the magnetite (Fe3O4) nanoparticles (MNPs) and silica-coated magnetite nanoparticles (SMNPs) were synthesized as adsorbents for removing humic acid (HA) from water resources. METHODS: The adsorption processes were performed in batch experiments with which the influence of pH, reaction time, adsorbent dosage, initial concentrations of HA and temperature were investigated. Specific techniques were applied to characterize the features of both adsorbents (i. e. TECHNIQUES) (SEM, XRD, TEM, BET, EDX and VSM). RESULTS: The maximum saturation magnetization for SMNPs was 30.2 emu/g, which made its separation from the solution by a magnetic field to be easier and faster. The HA adsorption process onto the both adsorbents were best described by the Freundlich isotherm and pseudo-second-order kinetic models. Highest adsorption efficiency of HA by MNPs an d SMNPs occurred at acidic conditions (pH ≈ 3). The mechanisms of adsorption process involved with a physisorption process such as (i. e. hydrogen bonding and electrostatic interaction). The predicted maximum monolayer adsorption capacities obtained by Langmuir isotherm model for MNPs and SMNPs were 96.15 and 196.07 mg/g, respectively. CONCLUSION: Higher amount of HA adsorption onto the surfaces of SMNPs than MNPs surfaces was observed, reflecting that silica impregnated on MNPs enhances the efficiency of the adsorbent in removing HA. SN - 2052-336X UR - https://www.unboundmedicine.com/medline/citation/27924220/Silica_coated_magnetite_nanoparticles_core_shell_spheres__Fe3O4@SiO2__for_natural_organic_matter_removal_ L2 - https://jehse.biomedcentral.com/articles/10.1186/s40201-016-0262-y DB - PRIME DP - Unbound Medicine ER -