Heterojunction Photocatalyst Loaded on Electrospun Nanofibers for Synergistic Enhanced Photocatalysis and Real-Time Temperature Monitoring

Abstract

Bi 2 WO 6 :Ho 3+ , Yb 3+ /g-C 3 N 4 (BHY/CN) photocatalysts are successfully loaded on polyacrylonitrile (PAN) nanofibers by electrospinning technology, which combines an upconversion effect and heterojunctions to achieve dual-functional characteristics. Polymer-modified photocatalytic materials offer a large specific surface area of 24.1 m 2 /g and a pore volume of 0.1 cm 3 /g, promoting the utility of solar energy. The introduction of rare earth ions and g-C 3 N 4 optimizes the structural band gap, which broadens the light absorption range and promotes electron transfer. Moreover, the heterojunction between Bi 2 WO 6 and g-C 3 N 4 has suppressed the complexation of photoinduced carriers, further improving catalytic performance. The optimized photocatalysts have higher photocatalytic activity with degrading 92.6% tetracycline-hydrochloride (120 min) under simulated sunlight irradiation. The optical thermometry has also been achieved based on the fluorescence intensity ratio technique, where the maximum absolute and relative sensitivity values of BHY/CN-1:6@PAN are 3.322% K −1 and 0.842% K −1 , respectively. This dual-functional nanofibers with excellent mechanical properties provide noncontact temperature feedback and efficient catalytic performance for better wastewater treatment and ecological restoration in extreme harsh environments.

Synthesis of Efficient S-Scheme Heterostructures Composed of BiPO4 and KNbO3 for Photocatalytic N2 Fixation and Water Purification

“…In Figure c, BiPO 4 /KNbO 3 exhibits significantly lower overpotential compared to pure KNbO 3 and BiPO 4 , signifying enhanced charge separation ability in the composite photocatalyst. , In addition to the three electrochemical analyses mentioned earlier, solid-state fluorescence characterization (PL) was conducted to evaluate the migration, conversion, and recombination processes of electron–hole pairs in the semiconductor materials. As shown in the Figure d, the fluorescence signal of BiPO 4 /KNbO 3 is weaker than that of pure KNbO 3 and BiPO 4 , implying a reduction in electron–hole pair recombination efficiency, , consistent with the results from the other three methods. Collectively, the data in Figure show that the combination of BiPO 4 and KNbO 3 effectively retards the combination of charge carriers, enhancing the photocatalytic efficiency of the catalyst and verifying the proposed inference in Figure .…”