Biosynthesis and characterization of iron oxide nanoparticles from Enteromorpha spp. extract: determination of adsorbent properties for copper (II) ions

Year 2019, Volume: 3 Issue: 1, 65 - 74, 15.04.2019

Gizem Ercan Deniz Uzunoğlu , Memduha Ergüt , Ayla Özer

Abstract

Iron oxide nanoparticles (IO-NPs) were synthesized
via a biosynthesis method using marine algae Enteromorpha spp. extract as a biological reductant agent in this
study. Moreover, the total phenolic content of Enteromorpha spp. was found as 9.81±
4.8 mg gallic acid equivalents/g dry algae. The biosynthesized IO-NPs were
characterized by zeta potential, DLS, SEM/EDX, and FTIR analysis methods and
also the formation of IO-NPs was approved with the UV-vis spectrum. The characteristic surface plasmon resonance (λ_SPR,
nm) value showing the formation of IO-NPs was observed at nearly 410 nm in terms of UV–vis
analysis. According to DLS analysis
results, the mean hydrodynamic diameter of IO-NPs was determined as
78.83 nm. According to SEM results, spherical nanoparticles are formed, and EDX analysis showed that the
signals in the Fe and O elements confirmed the formation IO-NPs. According
to FT-IR analysis results, the formation of IO-NPs was approved by the absorption bands at 599.83, and
475 cm⁻¹, which corresponded to the Fe-O stretches of Fe₃O₄
and Fe₂O₃. Subsequently, the synthesized IO-NPs were utilized as an adsorbent for the removal of Cu²⁺ from aqueous solutions. Batch adsorption
experiments were conducted to examine the optimum adsorption environmental
conditions and the equilibrium, kinetics, and mass transfer modeling was also
evaluated. The optimum adsorption conditions were found as initial pH 5.0;
temperature 35°C, initial Cu²⁺ concentration 275 mg/L, and adsorbent concentration 0.5 g/L. The
experimental equilibrium data were in the best agreement with Langmuir isotherm
model, and the maximum monolayer coverage capacity of IO-NPs for Cu²⁺
adsorption found to be 188.68
mg/g at optimum temperature value of 35°C. The adsorption kinetic data were
consistent with the pseudo second order kinetic model, and Weber Morris model
showed that both the film (boundary layer) and intraparticle diffusion affected
the adsorption process.

Keywords

Biosynthesis, Cu2+ adsorption, Enteromorpha spp., Iron oxide nanoparticles, Marine algae

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