Endogenous impurity regulation in solid waste-derived hydroxyapatite: From single-phase defects to in-situ multiphase reconstruction - Qingning Bai; Tongyu Liu; Xiaoyan Zhao; Zhiyu Chen; Shuo Cui; Jiayu Feng; Rui Cao; Zibin Pan; Ping Ning; Lijuan Jia; Fang Wang (Journal of Environmental Chemical Engineering, 2026)