Construction of oxygen-rich double CN-T/CN-U/Bi2WO6 Z-scheme heterojunction nanocomposite for efficient removal of rhodamine B
It is important for organic pollutants to be completely degraded without intermediates. In this work, a novel wide-spectrum-response oxygen-rich double direct Z-scheme heterojunction-structured photocatalyst, g-C 3 N 4 (precursor: urea, CN-U)/g-C 3 N 4 (precursor: thiourea, CN-T)/Bi 2 WO 6 (UTB), was prepared. The ternary system was confirmed by structural analysis and surface and morphological studies. The photocatalytic performances of the synthesized catalysts were estimated by photodegrading rhodamine B (RhB) solution. A more than 92 % mineralization and improved photocatalytic activity were achieved. UTB showed an outstanding photocatalytic performance for RhB degradation compared to CN-T, CN-U, Bi 2 WO 6 , and their binary nanocomposites.The improved photocatalytic properties and n more than 92 % mineralization were attributed to the double direct Z-scheme and oxygen vacancies, which maintained the outstanding redox capability of the electrons, expanded the range of light absorption, and facilitated the separation of photogenerated carriers. This study has demonstrated the prospect in obtaining a double Z-scheme structured photocatalysts with simultaneously high redox potential and narrow E g . This work has also offered a new strategy for fabricating low-consumption and efficient photocatalysts that mineralize more than 92 % of organic pollutants without existing intermediates.
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