A study on heterogeneous Fenton regeneration of powdered activated carbon impregnated with iron oxide nanoparticles

This paper reports on the fabrication, characterization and testing of iron oxide nanoparticles – powdered activated carbon (PAC) composites for water treatment and PAC regeneration by Fenton reactions. Different wet impregnation procedures and iron loadings were assessed in terms of organic micropollutant adsorption, by using the pharmaceutical diclofenac (DCF) as model compound. The preparation of a ferrihydrite-impregnated PAC with low iron content (~40.7 mgFe/gPAC) and high BET surface area (1037 m2 g-1) was found to be the optimum, exhibiting excellent DCF adsorption capacity, similar to that of the original PAC (203 mgDCF/gPAC/Fe), with the adsorption isotherm satisfactorily fitted by both the Freundlich and Langmuir models. The regeneration of the ferrihydrite-PAC (Fe/PAC) indicated that the presence of iron-oxide nanoparticles is important for achieving a high regeneration efficiency by hydrogen peroxide, even at neutral pH. However, the solution pH had a significant effect on DCF uptake, being greater at acidic pH after the regeneration of the composite. Ongoing R&D is aimed at material optimization and testing in a novel hybrid process scheme developed in author’s laboratory, involving a continuous Fe/PAC – Fenton process in conjunction with a low pressure membrane separation process.

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The influence of iron oxide nanoparticles upon the adsorption of organic matter on magnetic powdered activated carbon

Water Research ◽

10.1016/j.watres.2017.06.045 ◽

2017 ◽

Vol 123 ◽

pp. 30-39 ◽

Cited By ~ 20

Author(s):

Kim Maren Lompe ◽

David Menard ◽

Benoit Barbeau

Keyword(s):

Organic Matter ◽

Activated Carbon ◽

Iron Oxide ◽

Iron Oxide Nanoparticles ◽

Powdered Activated Carbon ◽

Oxide Nanoparticles

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Preparation and application of magnetite nanoparticles immobilized on cellulose acetate nanofibers for lead removal from polluted water

Water Science & Technology Water Supply ◽

10.2166/ws.2016.124 ◽

2016 ◽

Vol 17 (1) ◽

pp. 176-187 ◽

Cited By ~ 11

Author(s):

Thanaa I. Shalaby ◽

Marwa F. El-Kady ◽

Abd El Halem M. Zaki ◽

Soheir M. El-Kholy

Keyword(s):

Iron Oxide ◽

Cellulose Acetate ◽

Iron Oxide Nanoparticles ◽

Composite Nanofibers ◽

Polluted Water ◽

Oxide Nanoparticles ◽

Lead Removal ◽

Order Model ◽

Solution Ph ◽

Ft Ir

Novel magnetic cellulose acetate (CA) nanofibers were fabricated using an electrospinning process. Co-precipitated magnetite iron oxide nanoparticles were immobilized onto CA nanofibers at different weight ratios (0.2–2.5% wt/v) with a CA concentration of 15% (wt %), applied electric voltage of 20 kV, feeding rate of 1.5 ml/h and 7 cm distance between needle tip and collector. The prepared iron oxide nanoparticles were characterized using X-ray diffraction, a transmission electron microscope, a Fourier transform infrared spectrophotometer (FT-IR) and a vibrating sample magnetometer (VSM). The magnetic nanofibers were characterized by scanning electron microscopy, FT-IR, thermogravimetric analysis and VSM. The fabricated composite nanofibers were evaluated as a sorbent matrix for lead decontamination from aqueous solution using a batch technique. The influence of solution pH, contact time and adsorbent concentration on the removal efficiency was investigated. Adsorption kinetics models and isotherms were applied to the lead decontamination process onto the fabricated composite nanofibers. The kinetics of the sorption process revealed that the pseudo-second-order model fitted relatively better than the pseudo-first-order model. On the other hand, both the Langmuir and Freundlich isotherms gave a comparable fit to the adsorption data, with a high coefficient of regression of 0.999.

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Development of an activated carbon impregnation process with iron oxide nanoparticles by green synthesis for diclofenac adsorption

Environmental Science and Pollution Research ◽

10.1007/s11356-019-07329-7 ◽

2019 ◽

Vol 27 (6) ◽

pp. 6088-6102 ◽

Cited By ~ 1

Author(s):

Carole Silveira ◽

Quelen Letícia Shimabuku-Biadola ◽

Marcela Fernandes Silva ◽

Marcelo Fernandes Vieira ◽

Rosângela Bergamasco

Keyword(s):

Activated Carbon ◽

Iron Oxide ◽

Green Synthesis ◽

Iron Oxide Nanoparticles ◽

Oxide Nanoparticles ◽

Impregnation Process

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Superparamagnetic Iron Oxide Nanoparticles Modified with Silica Layers as Potential Agents for Lung Cancer Treatment

Nanomaterials ◽

10.3390/nano10061076 ◽

2020 ◽

Vol 10 (6) ◽

pp. 1076 ◽

Cited By ~ 1

Author(s):

Katarzyna Reczyńska ◽

Marta Marszałek ◽

Arkadiusz Zarzycki ◽

Witold Reczyński ◽

Kamil Kornaus ◽

...

Keyword(s):

Iron Oxide ◽

Iron Oxide Nanoparticles ◽

A549 Cells ◽

Superparamagnetic Iron Oxide ◽

Superparamagnetic Iron Oxide Nanoparticles ◽

Lung Epithelial Cells ◽

Bet Surface Area ◽

Oxide Nanoparticles ◽

Iron Release ◽

Silica Layers

Superparamagnetic iron oxide nanoparticles (SPIONs) are promising drug delivery carriers and hyperthermia agents for the treatment of cancer. However, to ensure their safety in vivo, SPIONs must be modified in order to prevent unwanted iron release. Thus, SPIONs were coated with silica layers of different morphologies: non-porous (@SiO2), mesoporous (@mSiO2) or with a combination of non-porous and mesoporous layers (@SiO2@mSiO2) deposited via a sol–gel method. The presence of SiO2 drastically changed the surface properties of the nanoparticles. The zeta potential changed from 19.6 ± 0.8 mV for SPIONs to −26.1 ± 0.1 mV for SPION@mSiO2. The Brunauer–Emmett–Teller (BET) surface area increased from 7.54 ± 0.02 m2/g for SPIONs to 101.3 ± 2.8 m2/g for SPION@mSiO2. All types of coatings significantly decreased iron release (at least 10 fold as compared to unmodified SPIONs). SPIONs and SPION@mSiO2 were tested in vitro in contact with human lung epithelial cells (A549 and BEAS-2B). Both nanoparticle types were cytocompatible, although some delay in proliferation was observed for BEAS-2B cells as compared to A549 cells, which was correlated with increased cell velocity and nanoparticles uptake.

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