Electrospinning Spatial Building of a Secondary S‐Scheme Heterojunction in Cs3Bi2Br9@g‐C3N4−SnO2/PAN Nanofiber for Real‐Time Monitoring Photocatalysis

Why It Matters

It solves two key hurdles—low photocatalytic efficiency and lack of in‑situ monitoring—enabling more reliable, scalable water‑treatment and renewable‑energy processes.

Key Takeaways

• Dual S‑scheme heterojunction boosts charge separation
• >97% pollutant degradation in 50 minutes under visible light
• Core‑shell nanofiber retains activity after three reuse cycles
• Temperature‑dependent luminescence enables real‑time reaction monitoring
• Sensitivity reaches 0.01061 K⁻¹ at 323 K

Pulse Analysis

Photocatalytic systems have long been hampered by rapid recombination of photogenerated electrons and holes, which limits their ability to convert sunlight into chemical work. The emergence of S‑scheme heterojunctions offers a strategic pathway to retain strong redox potentials while directing charge flow away from recombination sites. By embedding Cs3Bi2Br9, a lead‑free perovskite, with graphitic carbon nitride (g‑C3N4) and SnO₂ inside a polyacrylonitrile (PAN) sheath, the researchers leveraged coaxial electrospinning to produce a continuous nanofiber network that maximizes interfacial contact and light harvesting across the visible spectrum.

Performance testing revealed that the CCS/PAN nanofiber can decompose more than 97 % of Rhodamine B and virtually all tetracycline within 50 minutes under simulated sunlight, outperforming many benchmark photocatalysts. Mechanical testing confirmed that the fibers retain flexibility and structural integrity, while three successive reuse cycles showed negligible loss of activity, underscoring their practical durability. 01061 K⁻¹, allowing operators to fine‑tune reaction conditions on the fly. The integration of high‑efficiency degradation with built‑in monitoring opens new avenues for industrial water‑treatment plants, where continuous performance tracking is essential for regulatory compliance.

Moreover, the visible‑light‑driven charge separation architecture is directly applicable to photocatalytic hydrogen evolution, potentially lowering the cost barrier for renewable fuel production. As the technology scales, its lead‑free composition and low‑temperature synthesis align with sustainability goals, making it attractive to investors seeking green‑chemistry solutions. Future work will likely explore coupling the nanofiber platform with flow reactors and expanding the pollutant spectrum to solidify its market readiness.