Dynamic formation mechanism of persistent free radicals driven by water-phase oxidation-dependent heterogeneity of the carbon−silicon coupling structure in biochar - Mingqi Ruan; Fanhao Song; Tingting Li; Yuhan Cao; Yao Zhao; Xiaofei Chen; Fazhi Xie; Jin Hur; Baoshan Xing; Fengchang Wu (Journal of Hazardous Materials, 2025)