Oxytetracycline is one of the most heavily used antibiotics in livestock farming and human medicine, and it is also one of the most stubborn pollutants to get out of water. Most of the dose never gets absorbed. It passes straight through the body and lands in wastewater. And the treatment plants we have today were never built to catch it. This article walks through a practical fix: a Pr6O11/ZrO2 photocatalytic coating that breaks oxytetracycline down using nothing more than visible light. Why oxytetracycline is hard to remove from wastewater Only a small share of an antibiotic dose is actually used by the body. The rest is excreted, mostly unchanged, and…