Anatase grain loaded brookite nanoflower hybrid with superior photocatalytic activity for organic degradation

► Brookite/anatase hybrids with superior photocatalytic activity were prepared. ► Hybrids have an optimal brookite/anatase ratio of 6/4 for photocatalytic activity. ► Special heterojunction forms from the in situ nucleation of anatase on brookite. ► The heterojunction benefits the separation of photogenerated carriers in hybrids.