Iron-modified graphitic carbon nitride (FG materials) was prepared through a simple and cost-effective method using iron oxide and melamine to achieve simultaneous oxidation and adsorption of arsenic. We hypothesized that graphitic carbon nitride oxidizes As(III) to As(V) under light irradiation, and the converted As(V) is adsorbed by the amorphous iron phase on FG materials. FG materials were characterized by X-ray diffraction, Fourier transform infrared spectra, field-emission scanning electron microscopy, specific surface area, ultraviolet-visible light spectroscopy, photoluminescence, and X-ray photoelectron spectroscopy. As(III) was efficiently transformed to As(V) due to the photocatalytic-oxidation ability of graphic carbon nitride under visible and UV light irradiation, the oxidized As(V) was adsorbed by the amorphous iron phases, and As species were removed from the system. The removal efficiency of As(III) decreased from 50%, 41%, and 33% under UV light, visible light and dark, respectively. FG materials exhibited the photocatalytic-oxidation ability and adsorption capacity, and a synergistic effect was observed between graphitic carbon nitride and iron oxide. Removal of As can be achieved even under visible light, confirming the field applicability of low-cost FG materials.

铁改性的石墨碳氮化物（FG材料）是通过使用氧化铁和三聚氰胺同时实现砷的氧化和吸附的简单且经济高效的方法制备的。我们假设石墨氮化碳在光照射下将As（III）氧化为As（V），而转化后的As（V）被非晶铁相吸附在FG材料上。FG材料通过X射线衍射，傅立叶变换红外光谱，场发射扫描电子显微镜，比表面积，紫外可见光谱，光致发光和X射线光电子能谱进行了表征。由于图形碳氮化物在可见光和紫外光下的光催化氧化能力，As（III）被有效地转化为As（V），氧化后的As（V）被非晶态铁相吸附，从系统中去除了物种。在紫外光，可见光和黑暗下，As（III）的去除效率分别从50％，41％和33％降低。FG材料表现出光催化氧化能力和吸附能力，并且在石墨氮化碳和氧化铁之间观察到协同作用。即使在可见光下也可以去除砷，这证实了低成本FG材料的现场适用性。