Amin-functionalized magnetic-silica core-shell nanoparticles for removal of Hg<sup>2+</sup> from aqueous solution

Afraz, Ahmadreza; Hajian, Ali; Niknam, Zahra; Mosayebi, Elham; Yusefi, Amin; Sillanpää, Mika

doi:10.1080/01932691.2016.1193815

Cited by 9 publications

(1 citation statement)

References 37 publications

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“…The maximum Hg(II) adsorption capacity of hollow δ-FeOOH was compared with that of other iron oxides and hydroxides reported previously in the literature. The 89.1 mg g À1 found for hollow δ-FeOOH exceeded those for materials like FeOOH and FeMnOOH (6.4 and 11.9 mg g À1 ) (Kokkinos et al 2015); Fe 3 O 4 and Fe 3 O 4 @SiO 2 (24.80 and 29.52 mg g À1 ) (Afraz et al 2017), and Fe-Mn/graphene oxide composite (32.9 mg g À1 ) (Tang et al 2016), but was lower than the 200 mg g À1 found for mesoporous α-FeOOH adsorbent (Patra & Kim 2017), with its high specific surface (152.4 m 2 g À1 ).…”

Section: Comparison Of Adsorption Capacity With Other Adsorbentsmentioning

confidence: 78%

Development of hollow δ-FeOOH structures for mercury removal from water

Maia

Lages

Ladeira

et al. 2021

Water Practice and Technology

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δ-FeOOH, a magnetic iron oxyhydroxide, has a significant number of -OH groups on its surface. These provide an attractive platform for heavy metal species in contaminated water, giving it potential as an adsorbent. Its performance can be improved by increasing the number of active surface sites. δ-FeOOH hollow structures were synthesized on a mesoporous silica surface then treated with NaOH solution. X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed that structure synthesis was successful. δ-FeOOH, 5,27 nm, hollow crystals were produced with 63 m2 g−1 surface area and 20 nm average pore size. The point of zero charge was 4.72, which is beneficial for Hg(II) adsorption near neutral pH. The maximum Hg(II) adsorption capacity at pH 7 was determined as 89.1 mg g−1. The kinetics data were best fitted by a pseudo-second-order model with k2 equal 0,1151 g mg−1min−1. Finally, a nanomaterial filter was developed and used to remove mercury in water samples from a Brazilian river.

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