A waste-treats-waste strategy: Upcycling dual solid wastes into a La-modified biochar for sustainable deep fluoride removal - Xiaoying Zhang; Jinglei He; Xiaolin Ding; Zhijie Mao; Ran Hong; Dayong Xu; Changsheng Peng; Jiao Wang; Shijie Sun; Zhanao Lv; Saisai Chen (Journal of Water Process Engineering, 2026)