Voltage-regulation bioelectrochemical sulfur autotrophic denitrification (BESAD) with sulfur-based cathodes: Enhanced nitrogen removal and mechanism - Xiaoyan Dang; Youzhao Wang; Chaoyue Zhao; Xiubo Chen; Yaonan Zhu; Xiaolong Gao; Kuo Zhang; Shumin He; Jie Han; Jiedong Hao; Tong Zhu (Journal of Environmental Chemical Engineering, 2026)