Xuexia Liu,Limin Liu,Weiwei Yan,Yinfeng Wang,Chunfang Huang,Zhijun Wang
Iron-based materials are ideal faradaic electrodes for supercapacitors. However, boosting the specific capacitance and preparation with the simple method of iron-based materials remains a great challenge. Herein, hierarchical Fe 3 O 4 @FeS 2 nanocomposites are constructed through an annealing strategy with monohydrate ferrous sulfate as the precursor. X-ray diffractometry, high-resolution transition electron, and X-ray photoelectron spectroscopy results reveal that the hierarchical Fe 3 O 4 @FeS 2 nanocomposite is successively fabricated. The as-prepared materials exhibit a remarkable specific capacitance of 597.1 F g −1 at a current density of 3 A g −1 as electrode materials of supercapacitors. Inspiringly, specific capacitance is superior to most iron-based electrodes in previous reports. This may be ascribed to the junction at the interface of the different components and the efficient electron transfer of FeS 2 . This work is meaningful for the design and preparation of electrode materials with specific capacitance.
The treatment of multi-component pollutants in wastewater is a challenge. In this work, a novel nanoscale magnetite/pyrite (Fe 3 O 4 /FeS 2 ) composite was successfully synthesized, characterized and applied in simultaneous removal of Cr(VI) and phosphate. Transmission electron microscopy , X-ray photoelectron spectroscopy, Vibrating sample magnetometer , Fourier transformed infrared spectroscopy , and X-ray diffraction analysis were applied in characterization of Fe 3 O 4 /FeS 2 composites. The comparative experiments among FeS 2 , Fe 3 O 4 and Fe 3 O 4 /FeS 2 for the removal of Cr(VI) and phosphate were carried out. The Fe 3 O 4 /FeS 2 composite with molar ratio of 1:4 exhibited remarkable performance on the removal of Cr(VI) and phosphate at initial pH 3.0. Compared with bare Fe 3 O 4 , Fe 3 O 4 /FeS 2 exhibited an enhanced removal of Cr(VI). Cr(VI) removal includes electrostatic attraction and reduction. The removal of phosphate was due to electrostatic attraction and the formation of FePO 4 precipitates. The efficient removal of Cr(VI) and phosphate and the great performance of solid-liquid separation show that Fe 3 O 4 /FeS 2 nanocomposite is a promising material for Cr(VI) and phosphate contaminated wastewater treatment.
危险品化学品经营许可证（带存储）