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Many reagents as electron sacrificers have been recently investigated to induce decomposition of permanganate (KMnO 4 ) to produce highly reactive intermediate Mn species toward oxidation of organic contaminants; however, this strategy meanwhile causes low KMnO 4 utilization efficiency. This study surprisingly found that graphite can mediate direct electron transfer from organics (e.g., sulfamethoxazole (SMX)) to KMnO 4 , resulting in high KMnO 4 utilization efficiency, rather than reductive sites of graphite-induced conversion of KMnO 4 to highly reactive intermediate Mn species. The galvanic oxidation process (GOP) and comparative experiments of different organic contaminants prove that the KMnO 4 /graphite system mainly extracts electrons from organic contaminants via a one-electron pathway instead of a two-electron pathway. More importantly, the KMnO 4 /graphite system has superior reusability, graphite can keep a long-lasting reactivity, and the KMnO 4 utilization efficiency elevates significantly after each cycle of graphite. The transformation of SMX in the KMnO 4 /graphite system mainly includes self-coupling, hydroxylation, oxidation, and hydrolytic reaction. The work will improve insights into the electrontransfer mechanism and unveil the advantages of efficient KMnO 4 utilization in the KMnO 4 -based technologies in environmental remediation.