Department of Environmental Engineering and Soil Environment Research Center, Jeonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea.
Department of Environmental Engineering and Soil Environment Research Center, Jeonbuk National University, 567 Baekje-daero, Deokjin, Jeonju, Jeollabukdo 54896, Republic of Korea.
Environ Res. 2020 Sep;188:109832. doi: 10.1016/j.envres.2020.109832. Epub 2020 Jun 30.
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.
通过使用氧化铁和三聚氰胺的简单且经济有效的方法制备了铁改性石墨相氮化碳（FG 材料），以实现砷的同时氧化和吸附。我们假设在光照下，石墨相氮化碳将 As(III)氧化为 As(V)，并且转化的 As(V)被 FG 材料上的无定形铁相吸附。通过 X 射线衍射、傅里叶变换红外光谱、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 射线光电子能谱对 FG 材料进行了表征。由于可见光和紫外光照射下石墨相氮化碳的光催化氧化能力，As(III)被有效地转化为 As(V)，被氧化的 As(V)被无定形铁相吸附，砷物种从系统中被去除。在紫外光、可见光和黑暗条件下，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，并且在石墨相氮化碳和氧化铁之间观察到协同效应。即使在可见光下也可以实现砷的去除，证实了低成本 FG 材料的现场适用性。
