▎ 摘　　要

For efficient degradation of gaseous formaldehyde, BiVO4 (BVO) quantum tubes (QTs) were successfully synthesized and loaded on reduced graphene oxide (rGO) aerogel as a composite photocatalyst. Benefit from the band-gap widening effect in nanostructured BVO, the BVO-QTs can generate energetic photoelectrons required by oxygen reduction. The coupled rGO-aerogel would serve as a fast transfer path for photogenerated electrons, and thus promote the separation rate. Our results show that the composite photocatalyst has a favorable catalytic performance which can degrade formaldehyde from 1.0 ppm to 0.4 ppm in 15 min. The catalytic activity has been significantly improved compared with pristine BVO-QTs and bulk BVO. Moreover, the composite photocatalyst could be reused conveniently with undiminished performance profit from the unique 3D structures of aerogels, which are stable and favorable to the dispersion of BVO-QTs. This work provides a useful model for designing efficient photocatalyst for volatile organic compounds removal. (C) 2018 Elsevier Ltd. All rights reserved.