Oxygen-driven shift from Pb(II) lattice incorporation to reversible surface complexation: Exploiting hydrothermal sludge DOM for high-purity vivianite recovery - Xin Wang; Chaoyue Tai; Lexuan Wang; Yuanyuan Pei; Zhehao Li; Yiyang He; Suyun Xu; Lin Gu; Hanlin Zhang; Haiping Yuan; Haifeng Wen (Water Research, 2026)