Design of continuous drip-flow photoreactor for estrogen removal by photocatalyst immobilized nanofibers membrane: Reaction kinetics, degradation mechanism, and reusability

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F24%3A63589099" target="_blank" >RIV/70883521:28610/24:63589099 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Design of continuous drip-flow photoreactor for estrogen removal by photocatalyst immobilized nanofibers membrane: Reaction kinetics, degradation mechanism, and reusability

Popis výsledku v původním jazyce

This study reports on lab-synthesized polymeric nanofiber membranes loaded with green synthesized metal-doped photocatalyst nanoparticles fabricated by an electrospinning process and employed for the photocatalytic degradation of estrogen. Nanofibers were loaded with photocatalyst nanoparticles in concentrations of 5, 10, and 20%, and the membrane possessed a porosity of 0.47 µm due to uniform mesh structure. The photocatalyst-loaded polymeric nanofiber membranes were thermally pressed on polyethylene terephthalate for good adherence and to avoid jumbling while performing in a drip continuous flow biofilm reactor under UV and visible light irradiation. The photoactivity was highest for 20% loaded photocatalyst in nanofibers membrane film, which was evaluated at varied conditions of pH (3-11 ), estrogen concentration (0.1-0.5 mg/L ), dosage of nanofibers membrane layers (2-10), and flow rate (10-50 mL/min) to determine optimum experimental conditions. The reusability was tested for six consecutive cyclic runs. The highest degradation, over 90% (2.4 mg/g capacity), was achieved under UV at pH 7 in 2 hours compared to approximately one-third of performance in visible light. The degradation percentage was enhanced with more nanofiber layers dosage, low estrogen concentration, and low flow rate. The pseudo-first-order kinetic model best fitted the experimental data with a regression coefficient over 0.9. The degradation pathway to obtain resulting byproducts was proposed by the hydroxylation of estrogen molecules and cleaving of aromatic double bonds. The results suggest that green synthesized metal-doped photocatalyst nanoparticles loaded in nanofibers membrane film for immobilization purposes can be highly effective in the photodegradation of organic pollutants such as estrogens in water.

Název v anglickém jazyce

Design of continuous drip-flow photoreactor for estrogen removal by photocatalyst immobilized nanofibers membrane: Reaction kinetics, degradation mechanism, and reusability

Popis výsledku anglicky

This study reports on lab-synthesized polymeric nanofiber membranes loaded with green synthesized metal-doped photocatalyst nanoparticles fabricated by an electrospinning process and employed for the photocatalytic degradation of estrogen. Nanofibers were loaded with photocatalyst nanoparticles in concentrations of 5, 10, and 20%, and the membrane possessed a porosity of 0.47 µm due to uniform mesh structure. The photocatalyst-loaded polymeric nanofiber membranes were thermally pressed on polyethylene terephthalate for good adherence and to avoid jumbling while performing in a drip continuous flow biofilm reactor under UV and visible light irradiation. The photoactivity was highest for 20% loaded photocatalyst in nanofibers membrane film, which was evaluated at varied conditions of pH (3-11 ), estrogen concentration (0.1-0.5 mg/L ), dosage of nanofibers membrane layers (2-10), and flow rate (10-50 mL/min) to determine optimum experimental conditions. The reusability was tested for six consecutive cyclic runs. The highest degradation, over 90% (2.4 mg/g capacity), was achieved under UV at pH 7 in 2 hours compared to approximately one-third of performance in visible light. The degradation percentage was enhanced with more nanofiber layers dosage, low estrogen concentration, and low flow rate. The pseudo-first-order kinetic model best fitted the experimental data with a regression coefficient over 0.9. The degradation pathway to obtain resulting byproducts was proposed by the hydroxylation of estrogen molecules and cleaving of aromatic double bonds. The results suggest that green synthesized metal-doped photocatalyst nanoparticles loaded in nanofibers membrane film for immobilization purposes can be highly effective in the photodegradation of organic pollutants such as estrogens in water.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20801 - Environmental biotechnology

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů