The positively charged ultrathin g-C₃N₄ nanosheets is prepared by ultrasonic-assisted exfoliation of the protonated g-C₃N₄. Compared with the protonated g-C₃N₄ and exfoliated g-C₃N₄, the positively charged ultrathin g-C₃N₄ has abundant functional groups as well as desired dispersibility in deionized water, thus it could serve as a basic building block for design of related heterojunction composites. To take full advantage of these features, the positively charged ultrathin g-C₃N₄/MoS₂ composites are fabricated through a simple electrostatic adsorption self-assembly process followed by a hydrothermal method. By loading an appropriate amount of MoS₂ on the ultrathin g-C₃N₄ nanosheets, the as-fabricated composites exhibit considerable improvement on the photocatalytic activities toward the degradation of typical organic pollutants (i.e., methyl orange and phenol) under visible light irradiation. The composite containing 2 wt% MoS₂ shows the highest efficiency of about 96.5% for the methyl orange degradation, which is about 3.5 times of the positively charged ultrathin g-C₃N₄ and 8 times of the bulk g-C₃N₄, respectively. The superb photocatalytic performance benefits from the unique advantages, including richly available reaction sites, aligned energy levels between two phase, and efficient electron transfer. This work opens new possibilities for the rational desing and construction of the g-C₃N₄ based composites as highly efficient and stable visible-light driven photocatalysts for the degradation of organic pollutants.

带正电的超薄gC ₃ N ₄纳米片是通过超声辅助剥离质子化的gC ₃ N ₄制备的。与质子化的gC ₃ N ₄和剥落的gC ₃ N _4相比，带正电荷的超薄gC ₃ N ₄具有丰富的官能团以及在去离子水中的所需分散性，因此它可以作为设计相关异质结的基本构件复合材料。为了充分利用这些功能，带正电的超薄gC ₃ N ₄ / MoS ₂复合材料是通过简单的静电吸附自组装过程以及水热方法制造的。通过在超薄gC ₃ N ₄纳米片上负载适量的MoS ₂，制成的复合材料在可见光照射下对典型有机污染物（即甲基橙和苯酚）降解的光催化活性显示出显着改善。包含2 wt％MoS ₂的复合材料显示出最高的甲基橙降解效率，约为96.5％，约为带正电荷的超薄gC ₃ N _4的3.5倍和本体gC ₃ N _4的8倍。， 分别。出色的光催化性能得益于其独特的优势，包括丰富的反应位点，两相之间能级排列的能级以及有效的电子转移。这项工作为合理设计和构建基于gC ₃ N ₄的复合材料提供了新的可能性，这些复合材料是用于降解有机污染物的高效，稳定的可见光驱动光催化剂。