Ball-milled submicron natural pyrite particles for efficient peroxysulphate activation and monochlorobenzene degradation: The role of low-molecular-weight organic acids and reduced sulfur species driving iron redox cycles - Shaofei Wen; Rui Qiu; Zhenyu Ding; Shaoping Kuang; Hongwen Sun; Peng Zhang (Journal of Environmental Chemical Engineering, 2026)