Enhancing anaerobic digestion of agricultural waste via a stable Fe-Emodin-Biochar composite: Kinetic performance, energy recovery, and metabolic insights - Yafei Zhang; Jiayun Wu; Chuanyi Yue; Xinyu Wang; Youpei Qu; Xinchen Zhang; Yong Sun; Zhuqing Liu; Jingbo Qu; Xinrui Xu (Bioresource Technology, 2026)