National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huaian, 223003, China.
National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization, Huaiyin Institute of Technology, Huaian, 223003, China.
Environ Res. 2024 Jan 1;240(Pt 2):117384. doi: 10.1016/j.envres.2023.117384. Epub 2023 Oct 18.
The manganese oxide (MnO and iron-doped manganese oxide (Fe-MnO) nanoparticles (NPs) with reduced band gap (Eg) were fabricated through the co-precipitation process. They used to degrade Indigo Carmine (IC) and Rhodamine B (RB) binary mixture in an aqueous medium under solar light irradiation. From FT-IR, the twisting modes of the Mn-O bond and the stretching vibrations of the Fe-Mn-O bond were confirmed from the peaks observed at 480 cm,584 cm,675 cm, and 900 cm, 1150 cm, and 1200 cm respectively. The MnO has an optical band gap of 3.2 eV, which was decreased to 3 eV in Fe-MnO. The zero charge (PZC) point was 8 for Fe-MnO and 7 for MnO. The BET surface area for Fe-MnO2 was 398 m/g, relatively higher than MnO2 particles, having a surface area of 384 m/g. The average crystallite sizes calculated from Scherer formulae were 37 nm for MnO and 31 nm for Fe-MnO NPs. SEM confirmed the irregular morphology of the prepared particles. It was analyzed that agglomeration occurs in MnO than the Fe-MnO. The maximum degradation of IC dye was 99%, and that of RB was 98% at the optimum conditions. The data were best fitted to second-order kinetics.
通过共沉淀法制备了具有较小带隙（Eg）的氧化锰（MnO）和铁掺杂氧化锰（Fe-MnO）纳米颗粒（NPs）。它们用于在太阳能照射下的水溶液中降解靛蓝胭脂红（IC）和罗丹明 B（RB）二元混合物。从 FT-IR 中，观察到在 480 cm、584 cm、675 cm 和 900 cm、1150 cm 和 1200 cm 处的峰，证实了 Mn-O 键的扭曲模式和 Fe-Mn-O 键的伸缩振动。MnO 的光学带隙为 3.2 eV，在 Fe-MnO 中降低到 3 eV。零电荷（PZC）点对于 Fe-MnO 为 8，对于 MnO 为 7。Fe-MnO2 的 BET 表面积为 398 m/g，相对较高，MnO2 颗粒的表面积为 384 m/g。根据 Scherer 公式计算的平均晶粒尺寸分别为 37 nm 和 31 nm。SEM 证实了制备颗粒的不规则形态。分析表明，MnO 中的团聚比 Fe-MnO 更严重。在最佳条件下，IC 染料的最大降解率为 99%，RB 的最大降解率为 98%。数据最好拟合为二级动力学。
