Graphitic carbon nitride (g-C₃N₄) is a visible light active semiconductor. However, low conductivity and high recombination rate of photogenerated electrons and holes limit its application in photocatalysis. In this work, we design and synthesize hierarchically porous zinc oxide/graphitic carbon nitride (ZnO/g-C₃N₄) microspheres with type-II heterojunction to effectively degrade rhodamine B (RhB) via increasing the charge-separation efficiency. The ultraviolet-visible (UV–Vis) absorption spectra, Mott-Schottky plots and valence band X-ray photoelectron spectroscope confirm the formation of type-II heterojunction between ZnO nanocrystals and g-C₃N₄ nanosheets. As a result, the 1.5-ZnO/g-C₃N₄ composite (the mass ratio of zinc acetate dihydrate to g-C₃N₄ is 1.5) exhibits the highest photocatalytic activity with good stability and higher photocatalytic degradation rate comparing to pure g-C₃N₄ and pure ZnO. In addition, our results confirm that O₂⁻ and h⁺ are the main active species for ZnO/g-C₃N₄ in degradation of RhB.

石墨碳氮化物（gC ₃ N ₄）是可见光活性半导体。然而，光生电子和空穴的低电导率和高重组率限制了其在光催化中的应用。在这项工作中，我们设计和合成具有II型异质结的分层多孔氧化锌/石墨氮化碳（ZnO / gC ₃ N ₄）微球，以通过提高电荷分离效率有效降解罗丹明B（RhB）。紫外-可见（UV-Vis）吸收光谱，Mott-Schottky图和价带X射线光电子能谱仪证实了ZnO纳米晶体与gC ₃ N ₄之间的II型异质结的形成。纳米片。其结果是，在1.5的ZnO / GC ₃ Ñ ₄复合物（乙酸锌二水合物的对GC的质量比₃ Ñ ₄是1.5）表现出稳定性好，比较纯GC更高的光催化降解率最高的光催化活性的₃ Ñ ₄和纯ZnO。此外，我们的结果证实，ö ₂ ^-和H ⁺是氧化锌/ GC的主要活性物质₃ Ñ ₄中罗丹明B的降解。