Sol–gel synthesis and characterization of nickel-doped spinel ferrites for photodegradation of norfloxacin. - Celik, Cumali; Tariq, Malik Salman; Bari, Rana Zaki Abdul; Haq, Anwar Ul; R, Roopashree; Shit, Debasish; Ray, Subhashree; Shah, Tawaf Ali; Ullah, Ahmad Mohammad Salamat; Yasar, Muhammad (Journal of Sol-Gel Science & Technology, 2026)