In situ N-doping engineered biochar catalysts for oxidation degradation of sulfadiazine via nonradical pathways: Singlet oxygen and electron transfer - Lin Niu; Qitao Lei; Tianhui Zhao; Zhi Tang; Yaqi Cai; Deyi Hou; Siyuan Zhang; Mengyuan Fang; Guoqing Hou; Xiaoli Zhao; Fengchang Wu (Science of The Total Environment, 2024)