A　novel　electrothermal　swing　(ETS)　system　with　gold-electrodeposited　activated　carbon　fiber　cloth　(GE-ACFC)　was　developed　to　adsorb　and　sustainably　recover　low-concentration　Hg0.　GE-ACFC　with　an　Au　growth　time　of　1200　s　displayed　the　largest　Hg0　adsorption　capacity　and　＞90%　removal　efficiency.　The　Hg0　adsorption　of　GEACFC　was　dominated　by　physisorption　via　Au　amalgamation.　In　contrast,　Hg　adsorption　of　untreated　ACFC　(RAW-ACFC)　was　mainly　controlled　by　physisorption　and　chemisorption　related　to　carbonyl　groups.　Nevertheless,　both　ACFCs　could　reach　100%　ETS　Hg0　regeneration.　The　Hg　re-adsorption　of　GE-ACFC　was　stable,　with　efficiency　＞90%　at　different　regeneration　temperatures　in　three-cycle　ETS　experiments,　but　the　Hg　re-adsorption　efficiencies　of　RAW-ACFC　greatly　decreased　to　only　60%　after　250　?　regeneration,　due　to　the　formation　of　electrothermal　hot　spots　in　the　ACFC.　Because　the　thermal　and　electrical　conductivity　of　GE-ACFC　increased　due　to　Au　electrodeposition,　the　presence　of　electrothermal　hot　spots　in　GE-ACFC-1200s　was　minor.　Simulation　results　showed　that　both　pseudo-first-order　and　pseudo-second-order　models　fitted　well　to　the　desorption　patterns　of　the　GE-ACFC.　Mass　transfer　model　further　suggested　that　intraparticle　diffusion　control　was　the　rate-limiting　step,　with　diffusion　coefficients　increased　from　the　first　to　the　third　cycle　for　GE-ACFC.