Photoactive Fe₃O₄@Fe₂O₃ Synthesized from Industrial Iron Oxide Dust for Fenton-Free Degradation of Multiple Organic Dyes

Abstract

Herein, we described a cost-effective, viable methodology for using an iron-based industrial waste material known as iron oxide dust (IOD), also known as Hematite (α-Fe 2 O 3 ) for the synthesis of their chemically reduced magnetic version named r-IOD (Fe 3 O 4 @α-Fe 2 O 3 ). r-IOD showed its visible-light-promoted photoresponsive behavior for the photodegradation of higher concentration (∼1000 mg L −1 ) of five different model dyes (methyl orange (MO), metanil yellow (MY), Congo red (CR), methylene blue (MB), crystal violet (CV), and their mixtures) in the presence of sunlight. Based on kinetic and radical trapping experiments, mechanistic analysis supports the significant involvement of superoxide radicals responsible for the photodegradation. Moreover, different industrial and soil samples were externally spiked with dyes and further analyzed for a similar set of photodegradation experiments to support the viability of the reported procedure, concerning the utilization of waste materials.

Waste Iron Dust Derived Iron Oxide Nanoparticles for Efficient Adsorption of Multiple Azo Dyes

“…Previously r-IOD was used for the photocatalytic degradation of multiple dyes . However, when the r-IOD was synthesized using a larger amount of NaBH 4 , BET analysis showed a significant improvement in the surface area of r-IOD compared to that of IOD and the XRD analysis showed the presence of three different active phases of Fe(0), Fe 2 O 3 , and Fe 3 O 4 in r-IOD.…”

“…■ RESULTS AND DISCUSSION Synthesis of r-IOD. The r-IOD was synthesized by the previously reported method 38 with slight modification. IOD was reduced by the chemical reduction method at room temperature to get its chemically reduced version r-IOD.…”

“…Previously r-IOD was used for the photocatalytic degradation of multiple dyes. 38 However, when the r-IOD was synthesized using a larger amount of NaBH 4 , BET analysis showed a significant improvement in the surface area of r-IOD compared to that of IOD and the XRD analysis showed the presence of The good mesoporous surface area and presence of three active phases were favorable to act as a good adsorbent material, 48 and various adsorption experiments were performed to analyze the adsorption capacity of r-IOD. For the adsorption experiment, three model dyes, including one cationic (MG) and two anionic (RG 19, RO 16) were chosen.…”

3D Porous MoS2-Decorated Reduced Graphene Oxide Aerogel as a Heterogeneous Catalyst for Reductive Transformation Reactions

“…Additionally, reduction pathways explored in the present report were found to be sustainable and greener, as supported by the “DOZN” score , (Supporting Information, Section 2) and Green matrix calculation (Supporting Information, Section 3). , …”

Ag3PO4Nanoparticles-Decorated Melamine–Formaldehyde Polymer Nanocomposite as a Catalyst for the Photodegradation of Bisphenol A and its Antibacterial Activity

“…To explore the photodegradation efficiency of Ag 3 PO 4 –MFP in real wastewater samples, we spiked BPA in various wastewater effluents collected from different industries. Subsequently, we investigated the photodegradation of the spiked samples , using absorption spectroscopy. The bar plot of the % removal of BPA in Figure a shows that BPA is degraded with significant efficiency (>70%) even from spiked wastewater samples, indicating the potential of Ag 3 PO 4 –MFP as a photocatalyst (here CS = control spiked real wastewater sample and SS= spiked real wastewater sample with catalyst).…”