Dual function of Fe to boost the H2O2 selectivity and activation of S doped N-rich biochar catalyst in heterogeneous electro-Fenton system for tetracycline degradation. - Zhao, Quanyou; Wu, Xuan; Wang, Yichao; Yan, Cuicui; Fu, Yujie; Li, Xijin; Su, Ruidian; Gao, Mengchun (Applied Surface Science, 2026)