Enhanced removal of Cr(VI) from aqueous solution using polypyrrole/Fe3O4 magnetic nanocomposite

Bhaumik, Madhumita; Maity, Arjun; Srinivasu, V. V.; Onyango, Maurice S.

doi:10.1016/j.jhazmat.2011.03.062

Cited by 553 publications

(267 citation statements)

References 47 publications

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“…This was due to the presence of small size Fe 3 O 4 -NPs, which could aggregate together and create large particles of Fe 3 O 4 -NPs. (Bhaumik et al 2011). The peaks at 1.75 to 2.25 keV are related to gold which were used for sample coating.…”

Section: Powder X-ray Diffraction Analysismentioning

confidence: 99%

Investigation of the Role of Reductant on the Size Control of Fe3O4 Nanoparticles on Rice Straw

Khandanlou¹,

Ahmad²,

Shameli³

et al. 2013

BioResources

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The goal of this study was to prepare nanocomposites of rice straw coated with different percentages of Fe 3 O 4 nanoparticles (Fe 3 O 4 -NPs) [1.0, 5.0, 10.0, and 20.0 wt. %]. In this process, the size of Fe 3 O 4 -NPs changed with varying volumes of NaOH (2M). The Fe 3 O 4 -NPs were precipitated with sodium hydroxide from a solution of Fe(II) and (III) chloride in water under ambient conditions and N 2 gas by the quick precipitation method using urea as a stabilizer. The rice straw/Fe 3 O 4 nanocomposites (NCs) prepared by this method had magnetic properties in percentages higher than ten (10 wt. %). When the volume of NaOH increased, Fe 3 O 4 -NPs with uniform size and better distribution could be prepared, which means that the size of the NPs decreased as the reducing agent was increased. Transmission electron microscopy (TEM) showed that Fe 3 O 4 -NPs in rice straw were spherical with diameters from 18.47 to 9.93 nm. The SEM results show that the structure of rice straw underwent no particular change. EDX indicated the presence of Fe 3 O 4 -NPs on the surface of rice straw. X-ray powder diffraction (PXRD) indicated that the magnetic Fe 3 O 4 -NPs were pure and that the particles were small. The FT-IR results showed that the Fe 3 O 4 -NPs were successfully coated on the surface of rice straw.

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Section: Powder X-ray Diffraction Analysismentioning

confidence: 99%

Investigation of the Role of Reductant on the Size Control of Fe3O4 Nanoparticles on Rice Straw

Khandanlou¹,

Ahmad²,

Shameli³

et al. 2013

BioResources

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“…40,41 ) at 80 ºC under nitrogen atmosphere while stirring in three necked round bottom. The black colloidal product was collected using a 1.4 T magnet and it was washed several times by degassed deionized water.…”

Section: Synthesis Of Fe 3 O 4 Magnetic Nanoparticlesmentioning

confidence: 99%

Mixed-Hemimicelle Solid Phase Extraction Followed by Dispersive Liquid-Liquid Microextraction of Amphetamines from Biological Samples

Khalilian¹,

Rezaee²

2016

Journal of the Brazilian Chemical Society

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In this work, the synthesized Fe 3 O 4 nanoparticles was coated by sodium dodecyl sulfate and then it was used as a sorbent in mixed-hemimicelle solid phase extraction of some amphetamines, as psychoactive drugs, from biological samples. This extraction method was combined with dispersive liquid-liquid microextraction to enhance enrichment factors of targeted analytes. Effect of different parameters influencing the hybrid extraction performance, such as sodium dodecyl sulfate amount and sample pH, were investigated. The method showed linearity in the range of 1.0-250 and 2.0-250 µg L -1 for the most of analytes in urine and plasma samples, respectively. The limits of detection, based on signal to noise of 3, were found 0.1-0.2 and 0.3-0.5 µg L -1 in urine and plasma samples, respectively. The results of the intra-day and inter-day precision were less than 13.5% for all amphetamines. The amounts of relative recoveries in spiked urine and plasma samples were found in the range of 90-96 and 87-93%, respectively.

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“…After investigating the effect of contact time on the Cr(VI) adsorption, to understand the kinetic mechanism of the present adsorption process, pseudo-first-order and pseudo-second-order models were used to fit the kinetic data [3]- [6]. The linearized forms of the pseudo-first order and pseudo-second-order equations are given in Equations (1) and (2) …”

Section: Sorption Kineticsmentioning

confidence: 99%

Kinetics Investigation of Cr(VI) Removal by Modified Perlite with Fe2O3 and MnO2 Nanomaterials

Edebali¹

2016

IJCEA

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Abstract-Novel nanocomposite adsorbents for Cr(VI) removal from aqueous solution were synthesized by modifying perlite with α-MnO 2 and γ-Fe 2 O 3 nanoparticles. Nanocomposite adsorbents were characterized using Scanning Electron Microscopy (SEM) and FTIR. The adsorption capacity for Cr(VI) was found to be highly pH dependent and the adsorption kinetics followed the pseudo-second order kinetic model when compared to first-order kinetic model. The adsorption capacity was 8.64 and 7.6 mg g -1 for γ-Fe 2 O 3 and α-MnO 2 containing adsorbents as compared to very low adsorption capacity for perlite alone, confirming that these composites retain the constituent nanomaterial properties while being macroscopic particles suitable for chromium removal in water treatment.

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Enhanced removal of Cr(VI) from aqueous solution using polypyrrole/Fe3O4 magnetic nanocomposite

Cited by 553 publications

References 47 publications

Investigation of the Role of Reductant on the Size Control of Fe3O4 Nanoparticles on Rice Straw

Investigation of the Role of Reductant on the Size Control of Fe3O4 Nanoparticles on Rice Straw

Mixed-Hemimicelle Solid Phase Extraction Followed by Dispersive Liquid-Liquid Microextraction of Amphetamines from Biological Samples

Kinetics Investigation of Cr(VI) Removal by Modified Perlite with Fe2O3 and MnO2 Nanomaterials

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