High saturation magnetization superparamagnetic Fe/Ni core/shell microparticles for chromium removal. Issue 67 (1st September 2017) - Lu, Zhaoqing
Abstract : In this paper, the Fe/Ni microparticles are synthesized by two reactions which directly utilize H2 to reduce NiO and Fe3 O4 microspheres. Abstract : In this paper, the Fe/Ni microparticles are synthesized by two reactions which directly utilize H2 to reduce NiO and Fe3 O4 microspheres. X-ray diffraction and transmission electron microscopy show that the as-synthesized Fe/Ni microparticles possess a body/face-centered cubic crystalline structure and core/shell morphology. The magnetic hysteresis loops show that the as-fabricated core/shell Fe/Ni microparticles have a high saturation magnetization (132.8 emu g −1 ) at 305 K. The as-prepared Ni/Fe microparticles are used to remove Cr(vi ) via a coupled adsorption/reduction process. The introduction of nickel not only controls the iron passivation but also advances efficient flow of electron transfer between iron and Cr(vi ), thus efficient reduction of Cr(vi ) to Cr(iii ). The excellent products with both high saturation magnetization and Cr(vi ) adsorption capacity can be used as candidates for environmental remediation materials.