Department of Physics, Stella Maris College (Autonomous), Affiliated to University of Madras, Chennai, 600086, India.
Department of Chemistry, Bharath Institute of Higher Education and Research (BIHER), Chennai, 600073, India.
Environ Pollut. 2021 Mar 1;272:115983. doi: 10.1016/j.envpol.2020.115983. Epub 2020 Nov 6.
An economically viable and superficial technique was indorsed to yield ZnFeO nanocrystals in the system to investigate the impact of pH variation on the optical, structural, electrical, and magnetic properties of as-prepared nanocrystals. The as-synthesized ZnFeO nanocrystals were premeditated with the application protracted to degradation of Methylene blue organic dye. The results specify that the pH plays the utmost decisive facet in photo-Fenton recital. From XRD (X-Ray diffraction) analyses, it was confirmed that as-synthesized nanocrystals belong to a cubic Fd3m crystal phase. The crystallite size was also determined by the Scherrer formula and it was noticed that as the pH rises the crystallite size also increased. FT-IR (Fourier Transform Infrared) analysis depicts two absorption peaks ∼ 500 and ∼600 cm that represents tetrahedral (Td) and octahedral (Oh) sites. Using TEM (Transmission Electron Microscopy), the morphology was observed to be spherical particles with some agglomeration. Photoluminescence and UV-visible spectral studies were performed to investigate the optical properties. The bandgap energy was seen to decrease as the pH increased. Using BET analysis, the surface area for the as-synthesized samples was found to decrease on increasing the pH. The reaction results showed that the ZnFeO has good photocatalytic activity, which can be attributed to high surface area and pore volume, and large pore size. The ZnFeO produced by the co-precipitation route exhibited promising photocatalytic activity for the removal of textile dye, reaching nearly 99.2% of decolorization at 100 min. Therefore, ZnFeO particles rapidly prepared by the co-precipitation route have the potential for use in treatment of textile wastewater by the heterogeneous photo-Fenton process. With the help of VSM analysis, the coercivity and other magnetic properties were determined for the as-synthesized nanocrystal with plays a significant role in photocatalytic recyclability, which intends to premediate that the prepared nanocrystals can be used in industrial persistence.
一种经济可行且表面化的技术被认可，以在该系统中生成 ZnFeO 纳米晶体，以研究 pH 值变化对所制备纳米晶体的光学、结构、电学和磁学性质的影响。所合成的 ZnFeO 纳米晶体通过应用延长至亚甲基蓝有机染料的降解来预先研究。结果表明，pH 值在光芬顿反应中起着最决定性的作用。从 XRD（X 射线衍射）分析中，可以确认所合成的纳米晶体属于立方 Fd3m 晶体相。通过谢勒公式也确定了晶粒尺寸，并且注意到随着 pH 值的升高，晶粒尺寸也增大。FT-IR（傅里叶变换红外）分析描述了两个吸收峰∼500 和∼600cm，代表四面体（Td）和八面体（Oh）位。使用 TEM（透射电子显微镜）观察到形态为球形颗粒，存在一些团聚。进行了光致发光和紫外可见光谱研究以研究光学性质。随着 pH 值的增加，观察到带隙能减小。通过 BET 分析，发现随着 pH 值的增加，所合成样品的比表面积减小。反应结果表明，ZnFeO 具有良好的光催化活性，这归因于高比表面积和孔体积以及大孔径。通过共沉淀法制备的 ZnFeO 对去除纺织染料表现出良好的光催化活性，在 100min 内达到近 99.2%的脱色率。因此，通过共沉淀法快速制备的 ZnFeO 颗粒具有在非均相光芬顿工艺中处理纺织废水的潜力。在 VSM 分析的帮助下，确定了所合成纳米晶体的矫顽力和其他磁学性质，这在光催化可回收性中起着重要作用，旨在预先研究所制备的纳米晶体可用于工业持久性。
