School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China.
Key Laboratory of Theoretical Organic Chemistry and Function Molecule, Ministry of Education, Xiangtan, 411201, China.
Environ Sci Pollut Res Int. 2021 Sep;28(36):50286-50301. doi: 10.1007/s11356-021-14248-z. Epub 2021 May 6.
A novel magnetic FeO@SiO@BiOCO/rGO composite comprising of uniform core-shell-structured FeO@SiO@BiOCO microspheres mounted on reduced graphene oxide (rGO) sheets was successfully fabricated by using a facile hydrothermal method. The adsorption-desorption isotherm of FeO@SiO@BiOCO/rGO belonged to type IV with an H4-type hysteresis loop. The specific surface areas and magnetization saturation value (M) of FeO@SiO@BiOCO/rGO (x = 0.15 g) were 102.12 m/g and 25.4 emu/g, respectively. FeO@SiO@BiOCO/rGO (x = 0.15 g) exhibited remarkable photocatalytic degradation activity and mineralization effect for MO and decolorization performance for the mixed solution of MO, Rh B, and MB. MO degradation by FeO@SiO@BiOCO/rGO conformed to a first-order kinetic reaction, and the corresponding k value was 0.05553 min. A suitable amount of rGO in FeO@SiO@BiOCO/rGO could decrease the energy band gap, inhibit the recombination of photo-induced electron/hole (e/h) pair, and broaden and enhance the response of the catalyst to visible light, thereby enhancing the visible-light catalytic degradation of organic dyes. The active species produced in the photocatalysis included •O, •OH, and h, with •O being the dominant active species. The as-prepared photocatalyst also showed excellent magnetic separation performance and stability. Results show that the as-prepared FeO@SiO@BiOCO/rGO composite is a promising photocatalyst with considerable application potential in organic dyes removal.
一种新型的磁性 FeO@SiO@BiOCO/rGO 复合材料，由均匀的核壳结构的 FeO@SiO@BiOCO 微球负载在还原氧化石墨烯（rGO）片上，通过简便的水热法成功制备。FeO@SiO@BiOCO/rGO 的吸附-解吸等温线属于 IV 型，具有 H4 型滞后环。FeO@SiO@BiOCO/rGO（x = 0.15 g）的比表面积和磁化饱和值（M）分别为 102.12 m/g 和 25.4 emu/g。FeO@SiO@BiOCO/rGO（x = 0.15 g）对 MO 具有显著的光催化降解活性和矿化效果，对 MO、Rh B 和 MB 的混合溶液具有脱色性能。MO 在 FeO@SiO@BiOCO/rGO 上的降解符合一级动力学反应，相应的 k 值为 0.05553 min。适量的 rGO 可以降低 FeO@SiO@BiOCO/rGO 的能带隙，抑制光生电子/空穴（e/h）对的复合，并拓宽和增强催化剂对可见光的响应，从而增强有机染料的可见光催化降解。光催化过程中产生的活性物质包括•O、•OH 和 h，其中•O 是主要的活性物质。所制备的光催化剂还表现出优异的磁分离性能和稳定性。结果表明，所制备的 FeO@SiO@BiOCO/rGO 复合材料是一种很有前途的光催化剂，在去除有机染料方面具有可观的应用潜力。
