The design of metal-free photocatalysts has drawn considerable attention in photocatalysis due to the merits of low cost, sustainability, and recyclability without releasing toxic metals from photocorrosion. As an emerging metal-free photocatalyst, the covalent triazine-based framework (CTF) has stimulated great research interest in photochemical water splitting. Nevertheless, the poor separation efficiency of photogenerated charge carriers and limited light absorption ability of the CTF hinders its photocatalytic performance. Herein, a metal-free 2D/2D heterostructured photocatalyst composed of black phosphorus (BP) and a CTF is prepared by a facile liquid exfoliation approach and applied to photocatalytic water splitting and pollutant degradation. Compared to the CTF, the BP/CTF photocatalyst exhibits a two-fold increase in the hydrogen evolution rate and a nine-fold increase in the degradation rate constant of rhodamine B (RhB) with visible light illumination, mainly due to the enhanced photoinduced charge carrier separation and strengthened visible light harvesting ability. This work provides sustainable approaches for the synthesis and construction of highly-reactive and metal-free photocatalysts for solar-to-chemical energy conversion.

中文翻译：

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黑磷/共价三嗪骨架的无金属2D / 2D异质结构光催化剂，用于水分解和污染物降解

无金属光催化剂的设计因其低成本，可持续性和可回收性的优点而在光催化中引起了相当大的关注，同时又不会从光腐蚀中释放出有毒金属。作为新兴的不含金属的光催化剂，基于三嗪的共价框架（CTF）激发了对光化学水分解的巨大研究兴趣。然而，光生载流子的差的分离效率和CTF的光吸收能力有限阻碍了它的光催化性能。在此，通过简便的液体剥离法制备了由黑磷（BP）和CTF组成的无金属2D / 2D异结构光催化剂，并应用于光催化水分解和污染物降解。与周大福相比，在可见光照射下，BP / CTF光催化剂的氢气释放速率提高了两倍，而若丹明B（RhB）的降解速率常数提高了9倍，这主要是由于增强了光诱导的载流子分离和增强了可见光采光能力强。这项工作为合成和构建用于太阳能转化为化学能的高反应性和无金属的光催化剂提供了可持续的方法。