Nitrogen-Phosphorus Co-Doped Biochar for Persulfate Activation in Sulfadiazine Degradation: Degradation Performance, Mechanism and Toxicity Assessment - Weiwei Yu; Rongqi Liu; Ting Ai; Yufeng Mao; Jiajie Li; Lu Lv; Dan Liu; Yan Luo; Wang Xin; Man Luo; Boyu Liu (Water, Air, & Soil Pollution, 2026)