A catalyst made with cyanobacterial extract achieved higher reported crystal violet degradation and total organic carbon removal than chemically synthesized NiO/CoO, though the tests used prepared dye solutions rather than real wastewater.
The study compared Bauhinia purpurea leaf-extract-mediated zinc oxide nanoparticles made by co-precipitation and sol-gel synthesis in carbon-steel corrosion tests, with lower dissolved iron reported at 100 ppm than in the blank.