Co<sub>3</sub>S<sub>4</sub>/PES Catalytic Membrane Reactor for Oxidative Degradation of Rhodamine B in Water
Peroxymonosulfate (PMS)-based heterogeneous advanced oxidation processes are restricted in practice by the low activation efficiency of PMS and the utilization rate of reactive oxygen species (ROS). A Co<sub>3</sub>S<sub>4</sub>/PES catalytic membrane reactor (CMR) is constru...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Editorial Department of Journal of Sichuan University (Engineering Science Edition)
2025-01-01
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| Series: | 工程科学与技术 |
| Subjects: | |
| Online Access: | http://jsuese.scu.edu.cn/thesisDetails#10.15961/j.jsuese.202300319 |
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| Summary: | Peroxymonosulfate (PMS)-based heterogeneous advanced oxidation processes are restricted in practice by the low activation efficiency of PMS and the utilization rate of reactive oxygen species (ROS). A Co<sub>3</sub>S<sub>4</sub>/PES catalytic membrane reactor (CMR) is constructed using a flowing synthesis approach, employing a metal-organic frameworks (MOFs) template exchange strategy with ZIF-67 as the precursor and a polyethersulfone (PES) porous membrane as the substrate. The catalytic membrane is characterized by field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The results indicated that Co<sub>3</sub>S<sub>4</sub> nanoparticles with an average particle size of 23 nm are synthetically immobilized <italic>in situ</italic> within the pores of the PES membrane and are uniformly distributed along the membrane thickness, achieving an immobilization amount of 15.9%. The catalytic performance and reaction mechanism of the catalytic membrane are investigated by activating PMS to degrade a typical aromatic organic compound, Rhodamine B (RhB), as a model pollutant. Experimental results demonstrate that the Co<sub>3</sub>S<sub>4</sub>/PES catalytic membrane exhibits a RhB degradation rate exceeding 90% under conditions of a RhB solution concentration of 20 mg·L<sup>–1</sup>, an initial solution pH of 7, a temperature of 25 °C, and a membrane flux of 0.80 mL·min<sup>–1</sup>·cm<sup>–2</sup> (corresponding to a residence time of 0.68 s). The apparent reaction rate constant is 97.83 min<sup>–1</sup>, and the turnover frequency (TOF) reaches 489.15 L·min<sup>–1</sup>·g<sup>–1</sup>, both of which are 2 orders of magnitude higher than those achieved using the conventional suspension batch treatment mode with Co<sub>3</sub>S<sub>4</sub> powder. The Co<sub>3</sub>S<sub>4</sub>/PES catalytic membrane also maintains good stability. The dispersion of membrane pores effectively prevents the aggregation of Co<sub>3</sub>S<sub>4</sub> nanoparticles while confining the reaction within the micro-nano-scale membrane pores under flow-through conditions. This enhances mass transfer and contact between reactants and catalysts, accelerates PMS activation, and facilitates the efficient generation of singlet oxygen (<sup>1</sup>O<sub>2</sub>), which plays a dominant role in the rapid degradation of RhB. |
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| ISSN: | 2096-3246 |