The synthesis of a Bi2MoO6/Bi4V2O11 heterojunction photocatalyst with enhanced visible-light-driven photocatalytic activity

摘要

A novel Bi _(2) MoO _(6) /Bi _(4) V _(2) O _(11) heterostructured photocatalyst was successfully fabricated using a facile one-pot solvothermal method. This heterojunction consists of homogeneous dispersed Bi _(4) V _(2) O _(11) nanocrystals anchored on the surface of Bi _(2) MoO _(6) nanoflakes, endowing the heterojunction with nanosized interfacial contact. Based on the favorable interfacial contact, the band alignment at the heterojunction effectively facilitated photo-generated carrier transfer, which was verified by photoelectrochemical and photoluminescence measurements. Thereby, in contrast with pristine Bi _(2) MoO _(6) and Bi _(4) V _(2) O _(11) , the as-synthesized heterojunction with nanoscale contact exhibited significantly enhanced photocatalytic activity towards the degradation of MB and the reduction of Cr( VI ). In addition, the as-fabricated Bi _(2) MoO _(6) /Bi _(4) V _(2) O _(11) heterojunction exhibited good cycling stability for MB degradation after 4 cycles. Finally, a plausible photocatalytic mechanism for MB degradation over the Bi _(2) MoO _(6) /Bi _(4) V _(2) O _(11) heterojunction was discussed in detail. This work not only reports a highly efficient photocatalyst but also sheds light on the design and optimization of a heterojunction.