Researchers developed a BiVO4/CQDs/pg-C3N4 nanocomposite that uses simulated sunlight to treat contaminated water. In lab tests, the material removed 99% of Rhodamine B dye within 120 minutes and cut viable E. coli by 6.4 logs in 60 minutes. It kept 94.5% of its dye removal performance across five reuse cycles, with the structure largely intact. The design combines bismuth vanadate, carbon quantum dots made from tea polyphenols, and porous graphitic carbon nitride. The authors say the carbon quantum dots help narrow the bandgap and improve charge separation, which drives the photocatalytic reaction. The work is still at the lab stage, so questions about real wastewater conditions, scale-up, and long term stability remain. But it adds a practical direction for solar driven water treatment.
