VUV/UV was more efficient at degrading TTC than UV by a factor of about 10.
Fe(III) could promote TTC degradation under sole UV (254 nm) irradiation.
Fe(II) could facilitate TTC degradation under VUV/UV by potential Fenton process.
Fe(II) and Fe(III) enhanced TTC mineralization under VUV/UV and UV, respectively.
VUV/UV (+Fe(II)) was a cost-effective way for degrading TTC.