Production of magnetic photocatalysts from TiO2, Fe(NO3)3 and sucrose and their application for the degradation of model organic contaminants

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2024-08-08 DOI:10.1002/jctb.7725

Leydiane de Oliveira Pereira, Iara do Rosario Guimarães, Luana Pereira Zampiere, Isabela Sales Marques, Stéfany Gonçalves de Moura, Aline Aparecida Caetano, Fabiano Magalhães

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引用次数: 0

Abstract

BACKGROUND

Photocatalysis is an efficient method for the removal of organic contaminants in wastewater. In this study, different magnetic photocatalysts for the degradation of organic compounds were prepared.

RESULTS

Ti/C/Fe photocatalysts were prepared by supporting TiO₂ (20, 40 and 60% w/w) on a carbon/iron oxide (C/Fe) magnetic carrier. Characterization via Raman spectroscopy, X-ray diffractometry, thermal analysis, X-ray fluorescence, scanning electron microscopy and energy-dispersive X-ray spectroscopy/elemental mapping and magnetic property analysis by vibrating-sample magnetometry confirmed the presence of TiO₂, Fe₃O₄, Fe₃C and char in the photocatalysts as well as their magnetic properties. The results of specific surface area analysis showed that the C/Fe support had a surface area of 183 m² g⁻¹ and that this area decreased with an increasing amount of supported TiO₂, reaching up to 129 m² g⁻¹. Diffuse reflectance spectroscopy characterization revealed that the bandgap values obtained for the photocatalysts (Ti/C/Fe) were lower than 3.2 eV. The prepared photocatalysts showed high efficiency in degrading the contaminants Remazol Black (RB5) (99%), paracetamol (77%) and phenol (90%). Recovery and reuse experiments using RB5 showed that after the fourth reaction, the photocatalytic efficiency was reduced by 50%, and the recovery reached up to 70%. Sedimentation kinetics showed that while only 6% of the TiO₂ was deposited, up to 89% of the photocatalysts were deposited.

CONCLUSIONS

These results indicate that the photocatalysts showed excellent photocatalytic efficiency for different contaminants and can be easily and quickly separated from the reaction medium by magnetic separation. © 2024 Society of Chemical Industry (SCI).

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利用二氧化钛、Fe(NO3)3 和蔗糖生产磁性光催化剂并将其用于降解模型有机污染物

光催化是去除废水中有机污染物的一种有效方法。通过在碳/氧化铁（C/Fe）磁性载体上支撑 TiO2（20%、40% 和 60% w/w），制备了 Ti/C/Fe 光催化剂。通过拉曼光谱、X 射线衍射仪、热分析、X 射线荧光、扫描电子显微镜和能量色散 X 射线光谱/元素图谱进行表征，并通过振动样品磁力计进行磁性分析，证实了光催化剂中 TiO2、Fe3O4、Fe3C 和炭的存在及其磁性。比表面积分析结果表明，C/Fe 支持物的比表面积为 183 m2 g-1，随着支持物 TiO2 含量的增加，比表面积减小，最高为 129 m2 g-1。漫反射光谱表征显示，光催化剂（Ti/C/Fe）的带隙值低于 3.2 eV。所制备的光催化剂在降解污染物雷马唑黑（RB5）（99%）、扑热息痛（77%）和苯酚（90%）方面表现出很高的效率。使用 RB5 进行的回收和再利用实验表明，经过第四次反应后，光催化效率降低了 50%，回收率最高达到 70%。沉积动力学表明，虽然只有 6% 的 TiO2 被沉积，但高达 89% 的光催化剂被沉积。这些结果表明，光催化剂对不同污染物具有出色的光催化效率，并且可以通过磁分离法方便快捷地从反应介质中分离出来。© 2024 化学工业学会（SCI）。

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来源期刊

Journal of chemical technology and biotechnology 工程技术-工程：化工

CiteScore

7.00

自引率

5.90%

发文量

268

审稿时长

1.7 months

期刊介绍： Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.