Abstract By utilizing the bioinspired adhesion and metal chelation of polydopamine (PDA), a kind of ternary nanocomposites that consist of the graphitic carbon nitride nanosheet (CNNS), PDA layer and cadmium sulfide (CdS) nanocrystals were synthesized. In the resultant CNNS/PDA/CdS nanocomposites, CdS nanocrystals about 5−10 nm in diameter are scattered on the CNNS surface in the presence of the PDA layer. Due to the energy band matching, CNNS constructs a type II heterostructure with CdS nanoparticles via the mediation of the electroconductive PDA layer, thus enhancing the photocatalytic activity. Compared with pristine CdS and CNNS, the CNNS/PDA/CdS nanocomposite conspicuously shows superior photocatalytic performance under visible light above 420 nm, which can degrade 97 % Rhodamine B (RhB) molecules within 80 min. The introduction of a PDA layer between CNNS and CdS not only promotes the photon energy absorption but also facilitates the separation of photoinduced electron-hole pairs.

中文翻译：

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基于仿生粘附和螯合的高效g-C3N4/聚多巴胺/CdS纳米光催化剂的合成

摘要 利用聚多巴胺（PDA）的仿生粘附和金属螯合作用，合成了一种由石墨氮化碳纳米片（CNNS）、PDA层和硫化镉（CdS）纳米晶组成的三元纳米复合材料。在所得的 CNNS/PDA/CdS 纳米复合材料中，在 PDA 层存在的情况下，直径约 5-10 nm 的 CdS 纳米晶体散布在 CNNS 表面。由于能带匹配，CNNS通过导电PDA层的介导构建了具有CdS纳米颗粒的II型异质结构，从而增强了光催化活性。与原始的 CdS 和 CNNS 相比，CNNS/PDA/CdS 纳米复合材料在 420 nm 以上的可见光下显着显示出优异的光催化性能，可在 80 分钟内降解 97% 的罗丹明 B (RhB) 分子。