Facile preparation of an injectable carboxymethyl chitosan-silica sol persulfate controlled-release gel coupled with micro zero-valent iron for sustained nitrobenzene removal in groundwater - Tingting Wang; Youfeng Shan; Xinbo Yao; Fuxun Ai; Wenchao Du; Yuanyuan Sun; Jichun Wu; Hongyan Guo (Journal of Environmental Chemical Engineering, 2026)