Modulating\nSurface-Adsorbed Oxygen Species of Bismuth\nSilicate by a Solid Solution Strategy for Efficient Adsorption and\nPhotocatalytic Activity

Bismuth silicate photocatalysts suffer from insufficient\nphotocatalytic\nactivity due to an insufficient number of surface active sites and\nlow carrier separation and transport efficiency, which can be solved\nby defect modulation. Herein, Bi<sub>12</sub>SiO<sub>20</sub>/Bi<sub>2</sub>O<sub>2</sub>SiO<sub>3</sub>-BiOCl<sub><i>x</i></sub>Br<sub>1–<i>x</i></sub> (BSOCB) photocatalysts with\na high concentration of surface-adsorbed oxygen species (SAOS) are\nsynthesized by introducing a BiOCl<sub><i>x</i></sub>Br<sub>1–<i>x</i></sub> solid solution to modify nonhomogeneous\nBSO via an ion exchange strategy. The introduction of a solid solution\nenables the generation of dispersed nanoflowers and the regulation\nof SAOS due to the fact that anion–cation copolymerization\nguides the crystal growth, and the defects generated by the lattice\ndistortion modulate the concentration of SAOS on the catalysts during\nthe solid solution process. The obtained typical BSOCB photocatalyst\npossesses both high adsorption and photocatalytic properties, and\nthe results show that it not only can almost completely degrade the\ntraditional pollutant RhB within 20 min but also strongly degrades\nantibiotics, such as CIP (light for 150 min, 96%), NFX (light for\n150 min, 87%), and TC (light for 150 min, 77%). This work provides\na new approach for obtaining bismuth-based photocatalysts with controllable\nmorphology and a large number of surface active sites and provides\na theoretical and experimental basis for expanding the application\nscenarios of photocatalysts.