Biochar-based active capping for heavy metal-contaminated sediments: mechanistic evaluation and diffusion-adsorption modeling of long-term performance - Ying Hou; Mingming Wang; Cong Yan; Wu Xiao; Xiongzhi Long; Yi Wen; Xiaojing Zhao; Hongkai Zhang; Qi Zhang; Hao Xue (Journal of Soils and Sediments, 2026)