Amorphous NiFe-based nanocubes as efficient photo-Fenton catalyst for fast degradation of methylene blue

Publication date: Available online 21 June 2019Source: Journal of the Taiwan Institute of Chemical EngineersAuthor(s): Dianguo Wang, Xiaojun Guo, Fei Zha, Xiaohua Tang, Haifeng TianAbstractNi3[Fe(CN)6]2•10H2O were successfully synthesized by co-precipitation and heteroatom (P, B or S) incorporated amorphous NiFe-based nanocubes (Ni–Fe–O–M (M = P, B or S)) were successfully synthesized via one-step calcination of Ni3[Fe(CN)6]2•10H2O and heteroatom containing molecules. The structure, morphology and optical properties of Ni–Fe–O–M (M = P, B or S) were well characterized by XRD, SEM, XPS and UV-vis diffuse reflectance spectra. The S incorporated NiFe-based nanocubes (Ni–Fe–O–S) are better in degrading MB than other NiFe-based nanocubes. The degradation efficiency of Ni–Fe–O–S was 98.9% within 10 min in the presence of 60 mg/L H2C2O4 and 5 mM H2O2 under visible light irradiation. The COD and TOC removal efficiencies were 69.6% and 51.1%, respectively. The degradation rates of 5 cycles in 10 min are 98.9%, 96.2%, 95.8%, 92.3% and 88.3%, respectively. In the MB degradation, hydroxyl radical is proved to be the main active free radical. C8H11N2O3S−12, NO4S−, C6H6O3S, C6H5NO3, C8H12N2, C6H9O2−, C3H6O4, C3H4O4 and C6H10O are detected from the reaction solution by LS-MS and a possible pathway was accordingly proposed to elucidate the mechanism of MB degradation.
Source: Journal of the Taiwan Institute of Chemical Engineers - Category: Chemistry Source Type: research