Abstract Composites of g-C3N4 and vermiculite (gCNV–X, X = 10, 8, 6, 4, 2) with expanded vermiculite (VE) contents of 15.4%, 18.5%, 23.2%, 31.2%, and 47.6% were synthesized by a wet chemical method and provided confined space due to VE. Nanosheets or nanoparticles of g-C3N4 were homogeneously distributed in the gCNV–X composites. With increasing VE content, the photocatalytic activity of gCNV–X improved first, reached the optimum at a VE content of 18.5% (gCNV-8), and then decreased gradually. Composite gCNV-2, with a high VE content of 47.6%, exhibited a similar photocatalytic performance as pure g-C3N4 (gCN). After photocatalysis for 70 min, composite gCNV-8 had degraded 98.07% of RhB with a reaction rate constant that was approximately three times larger than that of gCN. Furthermore, gCNV-8 showed excellent stability and reusability. The composite g-C3N4/vermiculite exhibited an excellent photocatalytic performance, which was ascribed to the reduced particle size of g-C3N4, close interfacial contact, electrostatic interactions between g-C3N4 and vermiculite, enhanced photocarrier separation efficiency, improved photocurrent and light absorption ability, as well as a narrow band gap.

中文翻译：

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具有改善的可见光光催化活性的g-C3N4/蛭石复合材料的制备

摘要 合成了膨胀蛭石 (VE) 含量分别为 15.4%、18.5%、23.2%、31.2% 和 47.6% 的 g-C3N4 和蛭石 (gCNV-X, X = 10, 8, 6, 4, 2) 的复合材料通过湿化学方法，并由于 VE 提供了密闭空间。g-C3N4 的纳米片或纳米颗粒均匀分布在 gCNV-X 复合材料中。随着VE含量的增加，gCNV-X的光催化活性先提高，在VE含量为18.5%（gCNV-8）时达到最佳，然后逐渐降低。复合物 gCNV-2 的 VE 含量高达 47.6%，表现出与纯 g-C3N4 (gCN) 相似的光催化性能。光催化70分钟后，复合gCNV-8降解了98.07%的RhB，反应速率常数约为gCN的三倍。此外，gCNV-8 表现出优异的稳定性和可重用性。