Adsorption of heavy metal ions from aqueous solution by polyrhodanine-encapsulated magnetic nanoparticles

Song, Junyoung; Kong, Hyoun‐Joong; Jang, Jyongsik

doi:10.1016/j.jcis.2011.04.034

Cited by 231 publications

(93 citation statements)

References 52 publications

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“…Table II represents some of the recent works on mercury adsorption in batch mode using nano adsorbents. Manganese chloride nanoparticles [23], functionalized iron nanoparticles [13], [24], [25] with particle diameters 100, 40-50 and 10 nm respectively could remove more than 95% Hg(II) at various concentrations. Titania nano particles [14], [26] with diameter ranging from 3-10 nm and large surface area had adsorption capacity of more than 120 mg/g Hg(II) at concentrations ranging from 100-800 mg/L with or without UV illumination.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Titania Nanofibers: A Potential Adsorbent for Mercury and Lead Uptake

Dixit¹,

Mishra²,

Alam³

2017

IJCEA

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Abstract-The present investigation focuses on testing the adsorptive behaviour of laboratory synthesized titania nanofibers towards Hg(II) and Pb(II) in the aqueous system. The BET analysis confirmed that the electrospinned nanofibers were confirmed to possess a large surface area of 740 m 2 /g. The fiber mats were analysed by EDX, which confirmed the adsorption of the metals on the fiber surface. SEM revealed the smooth morphology and continuous nature of the fibers. The effect of pH, contact time and adsorbent dose is compared for both the metals. At the most optimized conditions, highest uptake of 95.5% was observed for 0.01 mg/L Hg(II) concentration while it was 83.8% for 0.5 mg/L Pb(II) concentration. Since the rate limiting steps in adsorption are of vital importance in order to define the rate parameters for design purposes, the present study takes into account Weber and Morris and Boyd mass transfer diffusion models for both Hg(II) and Pb(II) adsorption on titania nanofibers. The equilibrium data were then analyzed using Langmuir and Freundlich sorption models and the characteristic sorption parameters for each isotherm were determined. The discussion also focuses on few of the recently used adsorbents for heavy metal uptake and their comparison with the present study.Index Terms-Adsorption, heavy metals, isotherm, mass transfer, nano adsorbent.

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Section: Adsorption Kineticsmentioning

confidence: 99%

Titania Nanofibers: A Potential Adsorbent for Mercury and Lead Uptake

Dixit¹,

Mishra²,

Alam³

2017

IJCEA

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“…While the pseudo-second-order kinetic model is based on chemical adsorption (chemisorption) as follows [29].…”

Section: Adsorption Kinetic Studymentioning

confidence: 99%

Applications of CTAB Modified Magnetic Nanoparticles for Removal of Chromium (VI) from Contaminated Water

Youssef¹,

Elfeky²,

Mahmoud³

2017

Preprint

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a b s t r a c tThis study investigated the elimination of Cr(VI) from aqueous solution utilizing a composite from magnetic nanoparticles (Fe 3 O 4 ) capped with cetyltrimethylammonium bromide (CTAB). The structure of the prepared composite system was examined by Fourier Transform Infra Red Spectroscopy (FTIR), X-ray Diffractometry (XRD), and Transmission Electron Microscopy (TEM). Separation of the Fe 3 O 4 /CTAB composite from the wastewater can be achieved by application of an external magnetic field. Factors affecting the Cr(VI) expulsion from wastewater such as pH, competing ions, the dosage level of the nanoparticles, and contact time were studied. The results indicated that the maximum efficiency of the present system for removal of Cr(VI) (95.77%) was in acidic conditions (pH 4), contact time 12 h, and composite dosage of 12 mg/mL. The used Cr(VI) concentration was 100 mg/L. Considering results, the Fe 3 O 4 /CTAB system showed a high capability and selectivity for the treatment of water sullied with Cr(VI). This can recede the mutagenic and carcinogenic health risk caused by Cr(VI) water tainting. IntroductionStudy of water remediation from contaminants such as toxic heavy metals is one of the most important environmental issues. Contaminants can pose serious health and environmental probhttp://dx

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“…Table 2 represents some of the recent works on mercury adsorption in batch mode using nano adsorbents. Manganese chloride nanoparticles [15], functionalized iron nanoparticles [16][17][18] with particle diameters 100, 40-50 and 10 nm respectively could remove more than 95% Hg(II) at various concentrations. Titania nano particles [19,20] with diameter ranging from 3-10 nm and large surface area had adsorption capacity of more than 120 mg/g Hg(II) at concentrations ranging from 100-800 mg/L with or without UV illumination.…”

Section: Comparison With Similar Workmentioning

confidence: 99%

Mass transfer and kinetic studies on mercury adsorption by titania nanofibers

Dixit

Mishra

Alam

2016

MATEC Web of Conferences

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Abstract. The stringent laws and tight regulation on heavy metal bearing wastewaters being discharged into the water stream lead to emergence of technically advanced and super effective treatment methods. Heavy metal contaminated aqueous streams have become a global concern due to their carcinogenicity and delirious effects on human health. In particular, the health hazards of mercury include adverse effect on central nervous system, pulmonary and kidney functions, etc. Having a maximum discharge limit of 0.001 mg/L, which is the lowest amongst other heavy metals, mercury contamination has become a matter of global concern. In the present study, TiO2 having a proven track record for its affinity for heavy metals was lab synthesized in the form of fiber mats and tested for its adsorptive behaviour towards Hg(II) in aqueous system. The electrospinned nanofibers possessed smooth morphology and very high surface area ≈ 740 m 2 /g. The batch adsorption experiments showed titania nanofibers possessed great affinity towards Hg(II). At the most optimized conditions the removal percentage went remarkably high to 95.5% with initial Hg(II) concentration of 0.01 mg/L. Since the rate limiting steps in adsorption are of vital importance in order to define the rate parameters for design purposes, the present study takes into account External mass transfer, Weber and Morris and Boyd mass transfer diffusion models for Hg(II) adsorption on lab synthesized titania nanofibers. The equilibrium data were then analyzed using Langmuir, Freundlich and Temkin sorption models and the characteristic sorption parameters for each isotherm were determined. The Mass transfer mechanism appeared to be film diffusion controlled and data fitted best to Freundlich isotherm with regression value of 0.991. The discussion also focuses on few of the recently used adsorbents for Hg(II) uptake and their comparison with the present study on the basis of removal percentage and kinetics involved. Promising adsorbent characteristics and rapid Hg(II) uptake makes this process a convenient one.

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Adsorption of heavy metal ions from aqueous solution by polyrhodanine-encapsulated magnetic nanoparticles

Cited by 231 publications

References 52 publications

Titania Nanofibers: A Potential Adsorbent for Mercury and Lead Uptake

Titania Nanofibers: A Potential Adsorbent for Mercury and Lead Uptake

Applications of CTAB Modified Magnetic Nanoparticles for Removal of Chromium (VI) from Contaminated Water

Mass transfer and kinetic studies on mercury adsorption by titania nanofibers

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