Interfacial　engineering,　which　efficiently　modulates　the　electron　density　and　optimizes　the　electronic　structure,　has　rapidly　emerged　as　a　promising　strategy　to　facilitate　Fenton-like　reaction　processes.　Here,　an　interfacial　catalyst　with　Fe7S8　coupled　tubular　g-C3N4　(TCN)　was　crafted　for　peroxymonosulfate　(PMS)　activation.　Density　functional　theory　(DFT)　calculations　revealed　that　the　introduction　of　TCN　in　the　interfacial　engineering　facilitated　the　d-band　center　of　Fe7S8　to　be　closer　to　the　Fermi　energy　level,　enlarged　the　contribution　of　Fe-3d　orbitals　and　raised　the　number　of　conductive　carriers,　resulting　in　higher　PMS　activation　ability　and　electron　utilization　efficiency.　S　species　promote　valence　cycling　of　Fe　and　improve　catalytic　efficiency　as　well.　5　mg　&　sdot;L-　1　tetracycline　(TC)　was　efficiently　eliminated　with　a　high　rate　(0.49　min-　1)　under　dark　conditions　at　25　degrees　C　in　10　min.　Moreover,　contaminants　containing　electron-donating　groups　were　susceptible　to　effective　degradation.　Given　DFT　calculations　and　experiments,　the　intermediate　(*O)　was　the　key　precursor　for　the　generation　of　1O2,　determining　the　reaction　rate,　while　electron　transfer　process　(ETP)　was　proposed.　This　work　sheds　new　insights　for　interfacial　engineering　to　manipulate　the　electronic　structure　of　catalysts　and　enhanced　catalytic　performance,　facilitating　practical　ecological　remediation.