In this work, a novel heterojunction photocatalyst (BN@TTCOP) was designed and fabricated by a facile in situ growth of boron nitride (BN) on donor-acceptor type thiophene-triazine based conjugated organic polymer (TTCOP). Results revealed that the incorporation of BN could simultaneously boost light harvesting and narrow bandgap structure. More importantly, the separation efficiency and interfacial transfer rate of photogenerated charge carriers of the TTCOP were greatly promoted since negatively charged BN might exceptionally attract photogenerated holes from the surface of TTCOP by electrostatic interaction between them. Benefiting from these features, BN@TTCOP heterojunctions exhibited superior photocatalytic activity under visible-light illumination for metal-free selective oxidation of sulfides; the highest activity reached to >99 % of conversion, which was nearly 2 times higher than that of pristine TTCOP. Further analyses unveiled that the mechanism for the photooxidation is probably triggered by photogenerated superoxide radical. This study highlights a promising strategy for enhancing photocatalytic performance.

在这项工作中，一种新型的异质结光催化剂（BN @ TTCOP）是通过一种简便的原位设计和制造的。供体-受体型噻吩-三嗪基共轭有机聚合物（TTCOP）上氮化硼（BN）的生长。结果表明，BN的掺入可以同时促进光收集和窄带隙结构。更重要的是，大大提高了TTCOP光生载流子的分离效率和界面转移速率，因为带负电荷的BN可能通过它们之间的静电相互作用从TTCOP表面异常吸引光生空穴。受益于这些特性，BN @ TTCOP异质结在可见光照射下对无金属的硫化物选择性氧化表现出优异的光催化活性。最高的活性达到了> 99％的转化率，几乎是原始TTCOP的两倍。进一步的分析表明，光氧化的机制可能是由光生超氧化物自由基触发的。这项研究突出了提高光催化性能的有前途的策略。