Turmeric lends a hand: a kitchen-spice ingredient helps scrub factory dye from wastewater

Textile dye is stubborn stuff — bright in a river long after it leaves the factory. At the Institute of Nano Science and Technology in Mohali, researchers built a biodegradable membrane from plant-based fibres and zinc oxide nanoparticles made using turmeric extract. Published in Advanced Functional Materials, the membrane works two ways at once: light drives a cleaning reaction on its surface, and vibration adds a second, pressure-based one. Together they removed 98.6% of methylene blue and 96.7% of Congo red dye from water within two hours, and inactivated roughly three-quarters of E. coli and S. aureus bacteria in six hours. The team is clear that real factory effluent is a harder test than a lab bench — but a filter partly made from a spice rack staple is a cheerful place to start.

SDG 6 · Clean water and sanitation — Mechanism: tech innovation