The influence of nanoparticles on hydrodynamic characteristics and mass transfer performance in a pulsed liquid–liquid extraction column

Bahmanyar, Amir; Khoobi, Nafiseh; Mozdianfard, Mohammad Reza; Bahmanyar, Hossein

doi:10.1016/j.cep.2011.08.008

Cited by 80 publications

(58 citation statements)

References 23 publications

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“…Among the solvents, 0.01 and 0.005% NFs exhibited comparable stability and high extraction efficiency than the others. Addition of the NPs to the IL enhanced the extraction efficiency which might be associated to increment in the coefficient of mass transfer due to Brownian motion [32][33][34][35]. The high extraction efficiency at lower ZnO NPs composition may be attributed to saturation of the ILs at higher composition which may thwarts the extraction of the fungicides which is in line with the work of Ruiz-Palomero et al [43].…”

Section: Effect Of Composition Of the Nanofluidsupporting

confidence: 77%

“…Above 121% enhancement in the rate of mass transfer was reported upon adding 0.002% modified Fe 3 O 4 and Al 2 O 3 NPs to a single drop in liquid-liquid extraction process [34]. The use of NFs to enhance the performance of a pulsed liquid-liquid extraction column was investigated and addition of 0.01-0.1%(v/v) SiO 2 NPs to kerosene increased the mass transfer by a factor of 4-60% [35]. The same research group obtained 60% improvement in mass transfer performance by adding 0.1%(v/v) SiO 2 to kerosene-acetic acid-water chemical system in pulsed liquid-liquid extraction column [36].…”

Section: Introductionmentioning

confidence: 99%

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Nanofluid of zinc oxide nanoparticles in ionic liquid for single drop liquid microextraction of fungicides in environmental waters prior to high performance liquid chromatographic analysis

Amde

Tan

et al. 2015

Journal of Chromatography A

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a b s t r a c tUsing a nanofluid obtained by dispersing ZnO nanoparticles (ZnO NPs) in 1-hexyl-3-methylimidazolium hexafluorophosphate, new single drop microextraction method was developed for simultaneous extraction of three fungicides (chlorothalonil, kresoxim-methyl and famoxadone) in water samples prior to their analysis by high performance liquid chromatography (HPLC-VWD). The parameters affecting the extraction efficiency such as amount of ZnO NPs in the nanofluid, solvent volume, extraction time, stirring rate, pH and ionic strength of the sample solution were optimized. Under the optimized conditions, the limits of detection were in the range of 0.13-0.19 ng/mL, the precision of the method assessed with intra-day and inter-day relative standard deviations were <4.82% and <7.04%, respectively. The proposed method was successfully applied to determine the three fungicides in real water samples including lake water, river water, as well as effluent and influent of wastewater treatment plant, with recoveries in the range of 74.94-96.11% at 5 ng/mL spiking level. Besides to being environmental friendly, the high enrichment factor and the data quality obtained with the proposed method demonstrated its potential for application in multi residue analysis of fungicides in actual water samples.

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Section: Effect Of Composition Of the Nanofluidsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Nanofluid of zinc oxide nanoparticles in ionic liquid for single drop liquid microextraction of fungicides in environmental waters prior to high performance liquid chromatographic analysis

Amde

Tan

et al. 2015

Journal of Chromatography A

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“…2, the highest recovery (%) was obtained with 0.005% (m/m) ZnO-NFs. Dispersing the NPs in the IL enhanced the extraction efficiency which is in line with our recent report [18] and this might be attributed to the higher coefficient of mass transfer due to Brownian motion [20,21,29,30]. The high extraction efficiency at lower ZnO NPs composition may be attributed to saturation of the ILs at higher composition [18,31] which may prevents the extraction of the Hg-APDC complex.…”

Section: Study Of the Chemical Vapor Generationsupporting

confidence: 77%

“…Very recently, we reported the use of ionic liquidbased zinc oxide nanofluid (IL-ZnO-NF) as alternative environmentally benign solvent for single drop microextraction of selected fungicides from environmental waters [18]. Nanofluids, obtained from suspension of nanoparticles (size, o100 nm) in base fluids [19], have got great attention in the field of analytical chemistry because of their ability to enhance the mass transfer coefficient in extraction processes [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Ionic liquid-based zinc oxide nanofluid for vortex assisted liquid liquid microextraction of inorganic mercury in environmental waters prior to cold vapor atomic fluorescence spectroscopic detection

Amde

Liu

Tan

et al. 2016

Talanta

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a b s t r a c tZinc oxide nanofluid (ZnO-NF) based vortex assisted liquid liquid microextraction (ZnO-NF VA-LLME) was developed and employed in extraction of inorganic mercury (Hg 2 þ ) in environmental water samples, followed by cold vapor atomic fluorescence spectrometry (CV-AFS). Unlike other dispersive liquid liquid microextraction techniques, ZnO-NF VA-LLME is free of volatile organic solvents and dispersive solvent consumption. Analytical signals were obtained without back-extraction from the ZnO-NF phase prior to CV-AFS determination. Some essential parameters of the ZnO-NF VA-LLME and cold vapor generation such as composition and volume of the nanofluid, vortexing time, pH of the sample solution, amount of the chelating agent, ionic strength and matrix interferences have been studied. Under optimal conditions, efficient extraction of 1 ng/mL of Hg 2 þ in 10 mL of sample solution was achieved using 50 μL of ZnO-NF. The enrichment factor before dilution, detection limits and limits of quantification of the method were about 190, 0.019 and 0.064 ng/mL, respectively. The intra and inter days relative standard deviations (n¼8) were found to be 4.6% and 7.8%, respectively, at 1 ng/mL spiking level. The accuracy of the current method was also evaluated by the analysis of certified reference materials, and the measured Hg 2 þ concentration of GBW08603 (9.6 ng/mL) and GBW(E)080392 (8.9 ng/mL) agreed well with their certified value (10 ng/mL). The method was applied to the analysis of Hg 2 þ in effluent, influent, lake and river water samples, with recoveries in the range of 79.8-92.8% and 83.6-106.1% at 1 ng/mL and 5 ng/mL spiking levels, respectively. Overall, ZnO-NF VA-LLME is fast, simple, cost-effective and environmentally friendly and it can be employed for efficient enrichment of the analyte from various water samples.

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“…10,11 As some researchers considered Brownian movement of nanoparticles as one of the major responsible factors in the enhancement of heat transfer, investigation of mass-transfer enhancement in nanofluids with similar mechanism has been initiated. [12][13][14][15][16][17] Mass transfer in nanofluids was extensively reviewed in a recent published article. 18 In the field of mass transfer in nanofluids, there are a few researches dealt with mass diffusion in nanofluids 10,12,[19][20][21][22][23][24][25] and more researches investigated the influence of nanoparticles on convective mass transfer.…”

Section: Introductionmentioning

confidence: 99%

Mass transfer into/from nanofluid drops in a spray liquid‐liquid extraction column

Ashrafmansouri

Esfahany

2015

AIChE Journal

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The performance of a spray liquid-liquid extraction column at two mass-transfer directions was experimentally studied in the presence of silica nanoparticles. Toluene-based nanofluid drops containing 0.0005-0.01 vol % silica nanoparticles were dispersed in aqueous phase and acetic acid (AA) transfer between phases was investigated. The experiments were performed at fixed volumetric flow rates of dispersed and continuous phases. Maximum enhancement of 47.4% and 107.5% in overall mass-transfer coefficient, respectively, for mass-transfer direction of dispersed to continuous phase and vice versa were achieved for drops with 0.001 vol % silica nanoparticles. These enhancements can be referred to Brownian motion of nanoparticles and induced microconvection. The results showed that nanoparticles are more effective in augmenting AA transfer from continuous to dispersed phase. Probable reason is that smaller diameter and lower internal turbulence of drops in this transfer direction increase dispersed phase resistance potential to be manipulated by Brownian motion of nanoparticles.

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The influence of nanoparticles on hydrodynamic characteristics and mass transfer performance in a pulsed liquid–liquid extraction column

Cited by 80 publications

References 23 publications

Nanofluid of zinc oxide nanoparticles in ionic liquid for single drop liquid microextraction of fungicides in environmental waters prior to high performance liquid chromatographic analysis

Nanofluid of zinc oxide nanoparticles in ionic liquid for single drop liquid microextraction of fungicides in environmental waters prior to high performance liquid chromatographic analysis

Ionic liquid-based zinc oxide nanofluid for vortex assisted liquid liquid microextraction of inorganic mercury in environmental waters prior to cold vapor atomic fluorescence spectroscopic detection

Mass transfer into/from nanofluid drops in a spray liquid‐liquid extraction column

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