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Download fileSurface Modification of Magnesium Ferrite Nanoparticles for Selective and Sustainable Remediation of Congo Red
journal contribution
posted on 2021-09-25, 18:13 authored by Supawitch Hoijang, Tanapong Kunakham, Jeeranan Nonkumwong, Kajornsak Faungnawakij, Supon Ananta, Piyarat Nimmanpipug, T. Randall Lee, Laongnuan SrisombatSurface modification of silica-coated
magnesium ferrite nanoparticles
(MgFe2O4@SiO2 NPs) by 3-aminopropyltriethoxysilane
(APTES) shows enhanced selectivity for the removal of Congo Red (CR)
from both single and binary aqueous dye solutions. Before coating
the surfaces of amine-functionalized magnesium ferrite nanoparticles
(MgFe2O4–NH2 NPs) with silica,
control studies of the adsorption of cationic, neutral, and anionic
dyes were performed using both single and binary dye systems. The
studies found that the MgFe2O4–NH2 nanoadsorbent favors the adsorption of indigo carmine (IC)
and CR in single dye solutions (>90% removal efficiencies). However,
MgFe2O4–NH2 NPs preferentially
adsorb CR in binary dye solutions. Interestingly, the selectivity
of CR over IC depends on the initial concentration of IC/CR in the
IC/CR binary systems. A further enhancement in the selective removal
of CR in both single and binary dye solutions was achieved by coating
the MgFe2O4–NH2 NPs with silica
followed by modification with APTES (i.e., APTES-modified MgFe2O4@SiO2 NPs). The highly selective adsorption
capacity for CR on the APTES-modified MgFe2O4@SiO2 nanoadsorbent was attributed to the mixture of polar
functional groups (i.e., −OH and −NH2) on
the surface of the nanoadsorbent, which facilitates adsorbent–adsorbate
interactions such as electrostatic and hydrogen-bonding interactions,
which are amplified for CR with its more numerous polar functional
groups (i.e., amine, azo, and sulfonate groups). From the results,
the APTES-modified MgFe2O4@SiO2 nanoadsorbent
offers an effective, inexpensive, and reusable/sustainable system
for the selective removal and remediation of Congo Red from wastewaters.
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polar functional groupsmagnesium ferrite nanoparticlesbinary dye systemsbinary dye solutionssulfonate groups ).shows enhanced selectivitye ., aptese ., aminecr binary systems2 subremoval efficiencies ).nps ).− nhsustainable systemstudies foundperformed usinginitial concentrationindigo carminecontrol studiescongo redbonding interactionsanionic dyes