HW, I don't think your issue is mold as much as it is root rot, which a disinfectant won't cure. Don't lose hope though, as plants want to grow roots.
Trim off all of the dead roots, place the plant on top of a bed of damp sphagnum in a plastic bag and seal it up. Keep it warm - a minimum of 20°C - and shady, and it'll grow new roots in a few weeks.
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