g-C3N4/TiO2(B) binary heterojunction photocatalyst was prepared by in situ growth of two-dimensional (2D) TiO2(B) nanosheets (NSs) onto the surface of 2D g-C3N4 NSs using a mild one-step solvent method.Under Xenon lamp irradiation,g-C3N4/TiO2(B) nanocomposites showed higher photocatalytic degradation performance than pure g-C3N4 and TiO2(B) nanosheets,up to 82.17%.Based on the energy band structure and XPS results,it was clear that an electron transfer from TiO2(B) to g-C3N4 at the g-C3N4/TiO2(B) interface formed a built-in electric field.At the same time,the photogenerated electrons from the conduction band (CB) of g-C3N4 and holes from the valence band (VB) of TiO2(B) were retained,which contributed to activate oxygen molecules and hydroxyl groups to generate reactive radicals.The improved tetracycline degradation activity can be attributed to the ultrathin 2D/2D nanosheet structure and the constructed S-type heterojunction.
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