Abstract Nonmetals doping are effective for adjusting the electronic and molecular structures of C3N4 nanosheets (CN), which could broaden the range of visible light response and improve the photo-induced electron-hole separation. Here a series of nonmetals (S, P, F and Br) doped C3N4 nanosheets (x-CN) decorated with boron doped C3N4 nanodots (BCNDs) was prepared for the first time. Compared with the pristine nonmetals doped CN, the integrating of BCNDs with x-CN can effectively facilitates the charge separation and transfer in the photocatalytic process, and endows enhanced photocatalytic activity for hydrogen production. The maximum photocatalytic hydrogen production rate of the BCNDs/S-CN, BCNDs/P-CN, BCNDs/F-CN and BCNDs/Br-CN composite can reach 3924.81 μmol·g−1·h−1, 2387.62 μmol·g−1·h−1, 2374.06 μmol·g−1·h−1 and 3471.56 μmol·g−1·h−1 respectively, which is about 3.3, 4.3, 4.0 and 3.1 times that of their counterparts, respectively. This work demonstrates that BCNDs plays an important role to improve the photocatalytic properties by forming 0D/2D isotype heterojunction with nonmetals doped C3N4 nanosheets and provides new members for heterojunction photocatalysts, which is conductive to further fundamental and applied research.

中文翻译：

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硼掺杂的 C3N4 纳米点/非金属元素（S、P、F、Br）掺杂的 C3N4 纳米片异质结具有协同效应以提高光催化制氢性能

摘要 非金属掺杂可有效调节C3N4纳米片（CN）的电子和分子结构，可拓宽可见光响应范围，改善光致电子空穴分离。在这里，首次制备了一系列非金属（S、P、F 和 Br）掺杂的 C3N4 纳米片（x-CN），并用硼掺杂的 C3N4 纳米点（BCND）装饰。与原始非金属掺杂的 CN 相比，BCNDs 与 x-CN 的结合可以有效地促进光催化过程中的电荷分离和转移，增强了光催化制氢的活性。BCNDs/S-CN、BCNDs/P-CN、BCNDs/F-CN和BCNDs/Br-CN复合材料的最大光催化产氢速率可达3924.81 μmol·g-1·h-1、2387.62 μmol·g- 1·h-1、2374.06 μmol·g-1·h-1 和 3471。分别为 56 μmol·g-1·h-1，分别是其对应物的 3.3、4.3、4.0 和 3.1 倍。这项工作表明，BCNDs 通过与非金属掺杂的 C3N4 纳米片形成 0D/2D 同型异质结，在改善光催化性能方面发挥重要作用，并为异质结光催化剂提供了新的成员，这有助于进一步的基础和应用研究。