Synthesis of the MnO2-Fe3O4 catalyst support on amorphous silica: a new Fenton’s reagent in the degradation of the reactive blue-19 in aqueous solution

Ha, Nguyen Manh; Huong, Tran Thi; Son, Ninh The

doi:10.1080/10934529.2023.2198477

Cited by 3 publications

(3 citation statements)

References 33 publications

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“…However, the degradation rate of TC slightly decreased when the initial concentration of H 2 O 2 was increased to 7%. The excessive amounts of H 2 O 2 may have some side reactions with ·OH, such as those shown in Equations (2) and (3) [ 32 , 55 , 56 ]. The formation of either ·HO 2 with a weak oxidizing capacity or O 2 with no oxidizing properties can decrease the overall TC degradation rate [ 29 , 57 ].…”

Section: Resultsmentioning

confidence: 99%

“…The MnO 2 /MCM-41@Fe 3 O 4 samples were synthesized according to a procedure in the literature [ 20 , 32 ]. First, 1.5 g of KMnO 4 and 0.275 g of MnSO 4 -H 2 O were dissolved in 40 mL of deionized water.…”

Section: Methodsmentioning

confidence: 99%

“…This could be due to the following reasons. Firstly, an excessive amount of catalyst increased the collision probability of catalyst particles in the solution, which obscured some of the active sites and reduced the degradation efficiency [32]; on the other hand, the excessive amount of catalyst could also reduce the mass transfer rate of H2O2 and TC in the solution, leading to a reduction in catalytic activity [43]. The effect of the initial TC concentration was investigated, and the results are shown in Figure 6a,b.…”

Section: Effects Of Process Parameters On Tc Degradationmentioning

confidence: 99%

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Preparation of Activated Carbon-Reinforced Composite Beads Based on MnO2/MCM-41@Fe3O4 and Calcium Alginate for Efficient Removal of Tetracycline in Aqueous Solutions

Zheng,

Shi,

Zhang

et al. 2024

Polymers

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Tetracycline (TC) is a common antibiotic; when untreated TC enters the environment, it will cause a negative impact on the human body through the food chain. In the present study, MnO2/MCM-41@Fe3O4 (FeMnMCM) prepared using a hydrothermal and redox method and Camellia oleifera shell-activated carbon (COFAC) prepared through alkali activation were encapsulated using alginate (ALG) and calcium chloride as a cross-linking matrix to give the composite beads COFAC–FeMnMCM–ALG. The resultant COFAC–FeMnMCM–ALG composite beads were then carefully characterized, showing a high immobilization of MnO2/MCM-41@Fe3O4, with porous COFAC as an effective bioadsorbent for enriching the pollutants in the treated samples. These bead catalysts were subsequently applied to the oxidative degradation of TC in a Fenton oxidation system. Several parameters affecting the degradation were investigated, including the H2O2 concentration, catalyst dosage, initial TC concentration, and temperature. A very high catalytic activity towards the degradation of TC was demonstrated. The electron paramagnetic resonance (EPR) and quenching results showed that ·OH and ·O2− were generated in the system, with ·OH as the main radical species. In addition, the COFAC–FeMnMCM–ALG catalyst exhibited excellent recyclability/reusability. We conclude that the as-prepared COFAC–FeMnMCM–ALG composite beads, which integrate MnO2 and Fe3O4 with bioadsorbents, provide a new idea for the design of catalysts for advanced oxidation processes (AOPs) and have great potential in the Fenton oxidation system to degrade toxic pollutants.

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