化工新型材料

化工新型材料 ›› 2020, Vol. 48 ›› Issue (6) : 278-282.

开发与应用

以钛铁矿制备Fe₃O₄/TiO₂磁性复合材料及光催化性能

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Photocatalytic property of Fe₃O₄/TiO₂ magnetic composite prepared from ilmenite

Dai Zhengxiao, Hu Xiaofeng, Gao Xiaoyu, Zhen Shiya, Zhou Yannan, Gong Peijun

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Received		Published
2019-02-12		2020-06-20
Issue Date	Revised Date
2020-07-02	2019-02-12

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摘要

采用硫酸法提取钛铁矿的产物制备纳米TiO₂和聚乙烯亚胺(PEI)修饰的Fe₃O₄(Fe₃O₄/PEI),进一步采用组装法制备Fe₃O₄/TiO₂复合材料。表征复合材料的物相结构、化学组成、粒径、Zeta电位和磁性能,并以降解罗丹明B溶液的效果评价其光催化性能。结果表明,PEI修饰增强了Fe₃O₄与TiO₂的结合力;随着TiO₂与Fe₃O₄/PEI质量比的增大,复合材料的TiO₂含量增多,在紫外光下光催化活性增强;TiO₂中的微量Fe离子赋予复合材料良好的可见光催化活性,投料比为20时性能最佳。适中的尺寸、快速的磁响应能力,以及在5次重复使用中良好的催化稳定性和高于90%的收率,显示该复合材料具有良好的工业应用前景。

Abstract

Fe₃O₄/TiO₂ magnetic composites were fabricated by assembly method using nano-sized TiO₂ and poly(ethyleneimine)-modified Fe₃O₄ (Fe₃O₄/PEI),which were prepared by using the products extracted from ilmenite with sulfuric acid.The phase structure,chemical composition,size,Zeta potential and magnetic property of the composite were characterized,and the degradation efficiency of Rhodamine B was used to evaluate the photocatalytic performance of the composites.The results showed that the interaction between Fe₃O₄ and TiO₂ was greatly enhanced by modification with PEI due to the electrostatic attraction.As the mass ratio of TiO₂ and Fe₃O₄/PEI enlarged,the composite had an elevated TiO₂ content and improved photocatalytic activity under UV irradiation.Also the composites exhibited high photocatalytic activity as exposed to visible light due to the doped Fe ions in TiO₂,and the one with a mass ratio of 20 showed the best photocatalytic performance.The catalyst had a moderate size,quick response to the magnetite,good catalytic stability and recovery efficiency of over 90% in five recycle uses.All these features made the catalyst promising in industrial application.

关键词

钛铁矿 / TiO₂ / Fe₃O₄ / 磁分离 / 光催化

Key words

ilmenite / TiO₂ / Fe₃O₄ / magnetic separation / photocatalysis

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以钛铁矿制备Fe₃O₄/TiO₂磁性复合材料及光催化性能[J]. 化工新型材料, 2020, 48(6): 278-282 DOI:

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