Synthesis and characterization of novel γ-Fe2O3-NH4OH@SiO2(APTMS) nanoparticles for dysprosium adsorption

Kegl, Tina; Ban, Irena; Lobnik, Aleksandra

doi:10.1016/j.jhazmat.2019.120764

Cited by 53 publications

(26 citation statements)

References 56 publications

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“…We carried out experiments to determine the effect of initial sorbate concentration and temperature, on adsorption rates. We adopted the experimental procedure employed in this section from El-Aila et al 2016; Kegl et al (2019).…”

Section: Adsorption Studiesmentioning

confidence: 99%

“…(8). The dimensionless thermodynamic equilibrium constant was computed using the adsorption equilibrium constant as in Kegl et al (2019) and Kegl et al (2020) but modified to our study as Eq. (8) before computing the associated thermodynamic parameters using equations from (9, 10, 11) (El-Aila et al, 2016;El-Naggar et al, 2019;Gao et al, 2020;Kumar, 2014;Sayago et al, 2020).…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

“…These nano-adsorbents are employed to remove various types of pollutants from industrial wastewater. The nanomaterials can be magnetic or non-magnetic, magnetic nanomaterials can be separated using permanent magnets at the end of the adsorption process, while non-magnetic nanomaterials will require different means of separation (Kegl et al, 2019). In this study we employed non-magnetic nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

“…All of these silicas based materials are also summarised in Table 1 in their paper. Kegl et al (2019) investigated adsorption of dysprosium (Dy 3þ ) ions, a critical rare earth element, using novel γ-Fe 2 O 3 -NH 4 OH@SiO 2 (APTMS) nanoparticles and the process showed very good results that fit the Temkin isotherm, and the process was endothermic and spontaneous. Li et al (2020) prepared thiol-functionalized cobalt ferrite magnetic mesoporous silica composite (SH-mSiO 2 @CoFe 2 O 4 ) using the modified St€ ober method and used the composite to remove Hg 2þ ions from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

“…When considering adsorption of metal ions from wastewater, the most important property that we consider is a high adsorption ability, which is linked to a large surface area to volume ratio (Kegl et al, 2019). This gave us the platform to look at silica-based nano spheres supported on CaCO 3 as adsorbents to remove Pb 2þ ions from wastewater.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of lead ions from wastewater using nano silica spheres synthesized on calcium carbonate templates

Manyangadze

Chikuruwo

Narsaiah

et al. 2020

Heliyon

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Lead is a heavy metal that is bio accumulative and non-biodegradable that poses a threat to our health when it exists in excess in our bloodstream. It has found its way into wastewater from mostly chemical industrial processes. In this article, we investigated the adsorption and hence removal of lead (II) ions from wastewater in order to purify it for re-use in industrial processes or for plant and animal use. We synthesized nano silica hollow spheres (NSHS) and used them as adsorbents to remove lead ions from wastewater. When we characterized the NSHS using X-Ray diffraction, the amorphous nature of silica was evident with average crystal size of 39.5 nm. Scanning electron microscopy was used to determine the morphology of the adsorbent and the particles were found to be spherical in shape within a size range of 100-200 nm. Thermogravimetric analysis was used to determine the mass loss of NSHS which was~2% at 800 C. Our experimental results from adsorption studies showed that there was a linear relationship between temperature (27-60 C) and adsorption efficiency and an inverse relationship between initial metal concentration (50-300 mg/L) and adsorption efficiency. At a maximum temperature of 60 C and maximum initial metal concentration of 300 mg/L, the adsorption capacity was 200 mg/g and 262 mg/g, respectively while the adsorption efficiency was 99.6% and 87.4%, respectively. Our equilibrium and thermodynamic results revealed that the process was better modelled by the Langmuir adsorption isotherm (q max ¼ 266.89 mg/g and b ¼ 0.89 L/mg). The adsorption process was both endothermic (ΔH ¼ 97 kJ/mol) and spontaneous (ΔG ¼-22 kJ/mol). We can conclude that we were able to successfully synthesize NSHS, use them to remove lead (II) ions and the produced NSHS have a capacity that is higher than most other adsorbents investigated by other researchers.

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Section: Adsorption Studiesmentioning

confidence: 99%

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Adsorption of lead ions from wastewater using nano silica spheres synthesized on calcium carbonate templates

Manyangadze

Chikuruwo

Narsaiah

et al. 2020

Heliyon

View full text Add to dashboard Cite

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Applications of Magnetic Materials

Agrawal,

Srivastava,

Ningthoujam

2024

Indian Institute of Metals Series

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Graphene oxide and polyethyleneimine cooperative construct ionic imprinted cellulose nanocrystal aerogel for selective adsorption of Dy(III)

Zheng

Sun

et al. 2021

Cellulose

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Because of dysprosium's unique physical and chemical properties and limited supply, the price of rare earth dysprosium has been high in recent years. Therefore, the study of the method of high e ciency selective separation of dysprosium has the double value of scienti c research and practical economy. In this paper, we used periodic cellulose nanocrystals as the basic structure, polyethylenimine and graphene oxide were introduced, combined with imprinting technology, to construct porous imprinted aerogel and use it for selective adsorption of Dy(III). The physical and chemical properties were characterized by SEM, TEM, FT-IR and TGA. It was proved that both polyethylenimine and graphene oxide were crosslinked effectively with cellulose nanocrystals. Adsorption experiments showed that the composite imprinted aerogel could selectively adsorb dysprosium effectively, and the maximum adsorption capacity for Dy(III) was 36.495 mg g − 1 . The reproducibility experiment showed that aerogel had good regeneration ability. In conclusion, cellulose nanocrystals aerogel, which is environmentally friendly, e cient and repeatable, is expected to provide a new direction for the recovery of rare earth elements.

show abstract

Synthesis and characterization of novel γ-Fe2O3-NH4OH@SiO2(APTMS) nanoparticles for dysprosium adsorption

Cited by 53 publications

References 56 publications

Adsorption of lead ions from wastewater using nano silica spheres synthesized on calcium carbonate templates

Adsorption of lead ions from wastewater using nano silica spheres synthesized on calcium carbonate templates

Applications of Magnetic Materials

Graphene oxide and polyethyleneimine cooperative construct ionic imprinted cellulose nanocrystal aerogel for selective adsorption of Dy(III)

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