Abstract
To rapidly obtain a stable Fe3O4@cellulose heterogeneous Fenton catalyst, a novel in situ chemical co-precipitation method was developed. Compared with mechanical activation (MA)-pretreated cellulose (MAC), MA + FeCl3 (MAFC)-pretreated cellulose (MAFCC) was more easily dissolved and uniformly distributed in NaOH/urea solvent. MAFCC and MAC solutions were used as precipitators to prepare Fe3O4@MAFCC and Fe3O4@MAC nanocomposites, respectively. MAFCC showed stronger interaction and more uniform combination with Fe3O4 nanoparticles than MAC, implying that MAFC pretreatment enhanced the accessibility, reactivity, and dissolving capacity of cellulose thus, provided reactive sites for the in situ growth of Fe3O4 nanoparticles on the regenerated cellulose. Additionally, the catalytic performance of Fe3O4@MAFCC nanocomposite was evaluated by using for catalytic degradation of methylene blue (MB), and Fe3O4@MAC nanocomposite and Fe3O4 nanoparticles were used for comparative studies. Fe3O4@MAFCC nanocomposite exhibited superior catalytic activity for the degradation and mineralization of MB in practical applications. After ten cycles, the structure of Fe3O4@MAFCC nanocomposite was not significantly changed owing to the strong interaction between MAFCC and Fe3O4 nanoparticles. This study provides a green pathway to the fabrication of a stable nanocomposite catalyst with high catalytic performance and reusability for the degradation of organic pollutants.
Highlights
The Fenton reaction, one of the typical advanced oxidation processes (AOPs), has been proven to be one of the most promising alternative wastewater treatment technologies due to its excellent ability to produce strongly reactive hydroxyl radicals, which can attack the organic pollutants and convert the pollutants into small molecules or mineralize them into CO2 and H2O [1,2]
Magnetic properties were measured by a Series 7400 model 7404 vibrating sample magnetometer (VSM, LakeShore, Beijing, China), and the hysteretic loop was obtained under an applied magnetic field between −20,000 and 20,000 Oe at 300 K
MAFC-pretreated cellulose (MAFCC) was more uniformly distributed in the solvent than MA-pretreated cellulose (MAC), indicating that MA + FeCl3 (MAFC) pretreatment enhanced the accessibility of cellulose, which caused a better dispersion in the solvent
Summary
The Fenton reaction, one of the typical advanced oxidation processes (AOPs), has been proven to be one of the most promising alternative wastewater treatment technologies due to its excellent ability to produce strongly reactive hydroxyl radicals, which can attack the organic pollutants and convert the pollutants into small molecules or mineralize them into CO2 and H2O [1,2]. It is crucial to select a suitable support for preparing environment-friendly, stable, and renewable supported Fe3O4 Fenton catalyst for catalytic degradation of organic pollutants in wastewater. Cellulose acted as encapsulating medium for the magnetic nanoparticles mainly through two processes: monophase cellulose precursor and monophase Fe3O4 were first prepared separately, and they were combined to synthesize the composites for dye wastewater treatment. We present a novel and facile in situ chemical co-precipitation method for the preparation of a stable cellulose supported Fe3O4 nanoparticles heterogeneous Fenton catalyst without the use of crosslinker agents or intermediate fusion. MAFC-pretreated cellulose (MAFCC) was dissolved in a NaOH/urea solvent system to prepare the cellulose solution, which was used as the alkaline agent and precipitator to prepare the Fe3O4@MAFCC nanocomposite. The catalytic performance, mineralization capacity, and reusability of Fe3O4@MAFCC, Fe3O4@MAC, and pure Fe3O4 were comprehensively investigated
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