AI Article Synopsis
- - Photocatalytic membrane reactors (PMRs) show potential for removing micropollutants, like steroid hormones, by utilizing sunlight, though effectiveness is influenced by catalyst properties and conditions.
- - A new poly(vinylidene fluoride) nanofiber composite membrane (PVDF-BMCN) was developed, demonstrating that an increased visible-light-responsive catalyst ratio improved estradiol degradation from 20% to 75%.
- - Optimal results were achieved with specific conditions: a removal rate of 96% at a low concentration of E2, when factors like hydraulic residence time, light intensity, and BMCN catalyst loading were properly adjusted.
Article Abstract
Photocatalytic membrane reactors (PMRs) are a promising technology for micropollutant removal. Sunlight utilization and catalyst surface sites limit photodegradation. A poly(vinylidene fluoride) (PVDF) nanofiber composite membrane (NCM) with immobilized visible-light-responsive g-CN/BiMoO (BMCN) were developed. Photodegradation of steroid hormones with the PVDF-BMCN NCM was investigated with varying catalyst properties, operating conditions, and relevant solution chemistry under solar irradiation. Increasing CN ratio (0-65 %) enhanced estradiol (E2) degradation from 20 ± 10 to 75 ± 7 % due to improved sunlight utilization and photon lifetime. PVDF nanofibers reduced self-aggregation of catalysts. Hydraulic residence time and light intensity enhanced the photodegradation. With the increasing pH value, the E2 removal decreased from 84 ± 4 to 67 ± 7 % owing to electrical repulsion and thus reduced adsorption between catalysts and E2. A removal of 96 % can be attained at environmentally relevant feed concentration (100 ng.L) with a flux of 60 L.m.h, irradiance of 100 mW.cm, and 1 mg.cm BMCN65 loading. This confirmed that heterojunction photocatalysts can enhance micropollutants degradation in PMRs.
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| http://dx.doi.org/10.1016/j.jhazmat.2024.134765 | DOI Listing |
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