Oxalic acid–assisted, metal-free light-driven activation of sodium percarbonate on kaolinite for tetracycline degradation in water: Kinetic, mechanistic, and toxicological insights - Khwairakpam Bidya Devi; Akash Balakrishnan; Mary Nancy Flora; Arvind Kumar; Mahendra Chinthala; Natarajan Rajamohan; Sami Rtimi (Journal of Environmental Management, 2026)