Flavin-Conjugated Iron Oxide Nanoparticles as Enzyme-Inspired Photocatalysts for Azo Dye Degradation

Abstract

In this work, a new photocatalytic system consisting of iron oxide nanoparticles (IONPs), coated with a catechol-flavin conjugate (DAFL), is synthesized and explored for use in water remediation. In order to test the efficiency of the catalyst, the photodegradation of amaranth (AMT), an azo dye water pollutant, was performed under aerobic and anaerobic conditions, using either ethylenediaminetetraacetic acid (EDTA) or 2-(N-morpholino)ethanesulfonic acid (MES) as electron donors. Depending on the conditions, either dye photoreduction or photooxidation were observed, indicating that flavin-coated iron-oxide nanoparticles can be used as a versatile enzyme-inspired photocatalysts.

Highly Efficient Photocatalyst Fabricated from the Chemical Recycling of Iron Waste and Natural Zeolite for Super Dye Degradation

“…Fe 2 O 3 has been considered one of the main heterogeneous photocatalysts in the fields of solar energy conversion and environmental treatment, but it suffers from many disadvantages such as high load recombination, low conductivity, and short hole lengths in the bulk form [54]. The mesoporous surfaces of zeolite act as optimum sites to capture Fe 2 O 3 nanoparticles.…”

A Milestone in the Chemical Synthesis of Fe3O4 Nanoparticles: Unreported Bulklike Properties Lead to a Remarkable Magnetic Hyperthermia

“…In the last two decades, iron oxide nanoparticles (IONPs) have become increasingly versatile building blocks for a wide range of applications that encompass very diverse fields such as biomedicine, 1 , 2 magnetic data storage, 3 and environmental remediation. 4 Specifically, the number of works that make use of IONPs for therapy and diagnosis, including magnetic hyperthermia, magnetic resonance imaging, and drug delivery among others, increase in number every year. 5 From a chemical point of view, the standardized use of “IONPs” might seem quite vague given that there are multiple iron oxide polymorphs that exhibit an entirely distinct set of properties.…”

“…4 single crystals of different sizes have been synthesized making use of a methodically improved chemical route based on the thermal decomposition of an optimized FeOl complex.…”

Tunable Synthesis of Hematite Structures with Nanoscale Subunits for the Heterogeneous Photo-Fenton Degradation of Azo Dyes

“…To investigate the structure–activity relationships in the heterogeneous photo-Fenton catalysis of iron oxides, , it is crucial to study several variables regarding the (i) overall size (which affects the specific surface area, relating to the number of exposed active sites), (ii) morphology/shape (as in the exposed facets), and (iii) elemental (phase) composition. Collectively, all of these factors contribute to the particle concentration, defined as the total number of particles per unit of volume.…”

“…Photo-Fenton Degradation of Azo Dyes. To investigate the structure−activity relationships in the heterogeneous photo-Fenton catalysis of iron oxides, 38,39 it is crucial to study several variables regarding the (i) overall size (which affects the specific surface area, relating to the number of exposed active sites), (ii) morphology/shape (as in the exposed facets), and (iii) elemental (phase) composition.…”