通过黄铁矿还原技术回收钛渣制备赤铁矿纳米颗粒的新方法

Nanomaterials Pub Date : 2024-08-08 DOI:10.3390/nano14161330
Genkuan Ren, Yinwen Deng, Xiushan Yang
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摘要

大量的钛渣不仅造成了严重的环境污染,还浪费了大量的铁和硫资源。因此,如何从钛渣中回收利用铁和硫资源已成为亟待解决的问题。本文以钛渣为铁源,黄铁矿为还原剂,在氮气环境中通过黄铁矿还原法制备了赤铁矿纳米颗粒。利用 X 射线衍射图谱、紫外可见分光光度法和扫描电子显微镜等多种技术分析了赤铁矿纳米粒子的理化性质。发现赤铁矿纳米粒子的最佳合成条件是钛渣和黄铁矿的质量比为 14:1,温度为 550 ℃,时间为 30 分钟。结果表明,平均颗粒直径为 45 nm 的赤铁矿纳米颗粒几乎呈球形。根据 BET 法估算的比表面积、孔体积和孔径分别为 19.6 m2/g、0.117 cm3/g 和 0.89 nm。同时,所制备的赤铁矿纳米粒子具有弱铁磁性,在 200 nm-600 nm 波长范围内具有良好的吸光度,可用作可见光响应催化剂。这些结果表明,利用黄铁矿还原技术制备的赤铁矿纳米粒子在磁性材料和光催化领域具有广阔的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Novel Fabrication of Hematite Nanoparticles via Recycling of Titanium Slag by Pyrite Reduction Technology
An enormous quantity of titanium slag has caused not merely serious environment pollution, but also a huge waste of iron and sulfur resources. Hence, recycling iron and sulfur resources from titanium slag has recently been an urgent problem. Herein, hematite nanoparticles were fabricated through a pyrite reduction approach using as-received titanium slag as the iron source and pyrite as the reducing agent in an nitrogen atmosphere. The physicochemical properties of the hematite nanoparticles were analyzed using multiple techniques such as X-ray diffraction pattern, ultraviolet–visible spectrophotometry, and scanning electron microscopy. The best synthesis conditions for hematite nanoparticles were found at 550 °C for 30 min with the mass ratio of 14:1 for titanium slag and pyrite. The results demonstrated that hematite nanoparticles with an average particle diameter of 45 nm were nearly spherical in shape. The specific surface area, pore volume, and pore size estimated according to the BET method were 19.6 m2/g, 0.117 cm3/g, and 0.89 nm, respectively. Meanwhile, the fabricated hematite nanoparticles possessed weak ferromagnetic behavior and good absorbance in the wavelength range of 200 nm-600 nm, applied as a visible light responsive catalyst. Consequently, these results show that hematite nanoparticles formed by the pyrite reduction technique have a promising application prospect for magnetic material and photocatalysis.
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