Synergistic adsorption and photocatalytic degradation of perfluorooctanoic acid in aqueous solution by a regenerable biochar-titania nanotube composite

TNTs@biochar effectively concentrates trace PFOA from large water volumes onto a small amount of TNTs@biochar, enabling fast and efficient photodegradation of concentrated PFOA. Photodegradation regenerated the composite for multiple reuse cycles.