Fe₃O₄‐MWCNT Magnetic Nanocomposites as Efficient Fenton‐Like Catalysts for Degradation of Sulfamethazine in Aqueous Solution

Abstract

Sulfamethazine (SMT) is a ubiquitous pollutant due to its extensive application, and it cannot be effectively removed by conventional wastewater treatment processes. In this study, a magnetic Fe 3 O 4 nanoparticles immobilized on multi-walled carbon nanotubes (Fe 3 O 4 /MWCNTs) composites were synthesized, characterized and used as heterogeneous Fenton-like catalysts for SMT degradation. The MWCNTs scaffold with large surface area and good adsorption capacity can improve Fe 3 O 4 dispersibility and facilitate pollutant adsorption. The Fe 3 O 4 / MWCNTs exhibited enhanced catalytic activity for SMT degrada-tion. The effects of initial pH, H 2 O 2 dosage, catalyst dosage, initial SMT concentrations and temperature on SMT degradation were investigated. The results showed that the removal efficiency of SMT and total organic carbon was 98.3% and 59.7%, respectively, under optimal reaction conditions. The Fe 3 O 4 /MWCNTs also showed stable catalytic activity, reusability and easy recycling. Furthermore, the main oxidation products of SMT degradation and the primary active radical were identified, and the possible catalytic mechanism was tentatively proposed.

Metal Organic Framework with Coordinatively Unsaturated Sites as Efficient Fenton-like Catalyst for Enhanced Degradation of Sulfamethazine

“…Table lists a comparison of removal efficiencies of sulfonamides in the present work with some reported Fe-based Fenton-like catalysts. ,− As clearly displayed, our designed CUS-MIL-100­(Fe) catalysts exhibit a relatively higher catalytic activity than those reported in the literatures even with a lower initial pH value. These results indicate that the CUS-MIL-100­(Fe) scaffold with high porosity and large surface area seems to be an efficient Fenton-like catalyst for enhanced degradation of sulfonamide antibiotics in aquatic environment.…”

Optimization Parameters, Kinetics, and Mechanism of Naproxen Removal by Catalytic Wet Peroxide Oxidation with a Hybrid Iron-Based Magnetic Catalyst

“…CWPO was demonstrated to be effective for the removal of refractory organic compounds, traceable organic contaminants, or some inorganic pollutants, or in particular cases, to increase the wastewater biodegradability as a pretreatment of a subsequent biological treatment stage [1,[17][18][19]. Heterogeneous CWPO reactions using magnetite (Fe 3 O 4 ) supported on multi-walled carbon nanotubes (MWCNTs) as a catalyst were reported for the effective removal of methylene blue [20], sulfamethazine [21], 17α-methyltestosterone [22], and atrazine [23]. Furthermore, Fe 3 O 4 /MWCNTs material has been reported to show interesting properties such as the wide-range pH of work, stability, recyclability, and low toxicity towards the medium, making this catalyst an effective alternative for the treatment of different toxic compounds in wastewater.…”

“…Furthermore, Fe 3 O 4 /MWCNTs material has been reported to show interesting properties such as the wide-range pH of work, stability, recyclability, and low toxicity towards the medium, making this catalyst an effective alternative for the treatment of different toxic compounds in wastewater. It is noteworthy to say that MWCNTs acting as catalytic support plays an important role for the dispersion of the magnetite into the surface, obtaining a minimum leaching of the phase active and allowing it to work at a wider pH range [20][21][22][23][24][25]. Indeed, the surface of the MWCNTs has been reported to be chemically functionalized to potentially enhance the density of the active sites responsible for the • OH generation, promoting the • OH species formation [25].…”

Fe-Cu Doped Multiwalled Carbon Nanotubes for Fenton-like Degradation of Paracetamol Under Mild Conditions

“…Furthermore, due to the hydrophobic character of their surface, CNTs exhibit more active sites to interact with organic pollutants. In this regard, different articles have reported the use of iron oxides supported over CNTs as heterogeneous Fenton catalysts for the degradation of phenolic compounds [28][29][30][31], herbicides [32], antibiotics [33] and dyes [34]. However, to the best of our knowledge, there are no studies of Fenton-like degradation of paracetamol using iron catalysts supported on carbon nanotubes.…”