Abstract Efficient separation of photo-induced charge carriers is highly desired for improving photocatalytic activity. Herein, morphology control and element doping are adopted to overcome the shortcomings of insufficient contact with pollutants and limited light-harvesting capability of the pristine g-C3N4. Petal-like Cl-doped g-C3N4 nanosheets are fabricated by a flexible self-assembly route using melamine and cyanuric as precursors, with different amounts of NH4Cl added to adjust the chlorine doping ratio. Benefiting from the enlarged specific surface area (98.330 m2 g−1), tunable band structure and the effective charge separation, the prepared chlorine doping g-C3N4 nanosheets show obviously higher efficiency in the removal of rhodamine B (90 min, 94.3 %) and tetracycline hydrochloride (120 min, 65.7 %), with degradation kinetic rates about 15.8 and 2.3 times than that of pristine g-C3N4. The supramolecular self-assembly and chlorine doping display a noticeable synergy on enhancing the photocatalytic performance, enabled g-C3N4-based nano-sized photocatalysts to be highly competitive candidates for pollutant elimination.

中文翻译：

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自组装合成具有可调带结构的花瓣状Cl掺杂g-C3N4纳米片以增强光催化活性

摘要 为了提高光催化活性，非常需要有效分离光致载流子。在此，采用形貌控制和元素掺杂来克服原始g-C3N4与污染物接触不足和捕光能力有限的缺点。花瓣状 Cl 掺杂 g-C3N4 纳米片是通过灵活的自组装路线制造的，使用三聚氰胺和三聚氰胺作为前体，添加不同量的 NH4Cl 以调节氯掺杂比例。受益于扩大的比表面积（98.330 m2 g-1）、可调带结构和有效的电荷分离，制备的氯掺杂 g-C3N4 纳米片在去除罗丹明 B 方面表现出明显更高的效率（90 分钟，94.3 %）和四环素盐酸盐（120 分钟，65.7 %），降解动力学速率约为原始 g-C3N4 的 15.8 倍和 2.3 倍。超分子自组装和氯掺杂在提高光催化性能方面表现出明显的协同作用，使基于 g-C3N4 的纳米光催化剂成为消除污染物的极具竞争力的候选者。