Preparation of a magnetic solid acid Fe3O4@PS-SO3H and its use in hydrolysis of cellulose

IF 2.8 4区生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Journal of chemical technology and biotechnology Pub Date : 2024-06-17 DOI:10.1002/jctb.7696

Mengmeng Liu, Zhen Liu, Linghui Qiao

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引用次数: 0

Abstract

BACKGROUND

In order to improve the catalytic performance and stability of magnetic solid acid for cellulose hydrolysis in the aqueous phase, this study first modified the surface of magnetite (Fe₃O₄) nanoparticles (NPs) with oleic acid. Then, in an oil-in-water (O/W) emulsion system, polystyrene (PS) was coated on the Fe₃O₄ NPs through emulsion polymerization. Finally, magnetic solid acid Fe₃O₄@PS-SO₃H was prepared by sulfonation.

RESULTS

The obtained Fe₃O₄@PS-SO₃H was characterized by transmission electron microscopy, energy-dispersive X-ray spectroscopy, infrared, X-ray diffraction, X-ray photoelectron spectroscopy and thermogravimetric analysis, and its acid densityand magnetic properties determined. Applied to cellulose hydrolysis, it exhibited 35.28 emu·g⁻¹ saturation magnetization and 3.56 mmol·g⁻¹ maximum acid density. At 140 °C and 1:1 acid to substrate ratio, cellulose hydrolysis with Fe₃O₄@PS-SO₃H gave a glucose yield of ≤64.14% in 10 h. The solid acid was conveniently recycled with a magnet and reused for further cellulose hydrolysis. It maintained good catalytic activities after five cycles.

CONCLUSION

The magnetic solid acid with a polystyrene backbone prepared by emulsion polymerization exhibits efficient and stable catalytic performance, in line with the trend of green development in ‘bio-refining’, and lays the foundation for the development of composite solid acids. © 2024 Society of Chemical Industry (SCI).

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磁性固体酸 Fe3O4@PS-SO3H 的制备及其在纤维素水解中的应用

背景为了提高磁性固体酸在水相纤维素水解中的催化性能和稳定性，本研究首先用油酸修饰了磁铁矿（Fe3O4）纳米颗粒（NPs）的表面。然后，在水包油（O/W）乳液体系中，通过乳液聚合在 Fe3O4 NPs 上涂覆聚苯乙烯（PS）。最后，通过磺化法制备出磁性固体酸 Fe3O4@PS-SO3H。结果利用透射电子显微镜、能量色散 X 射线光谱、红外光谱、X 射线衍射、X 射线光电子能谱和热重分析对所制备的 Fe3O4@PS-SO3H 进行了表征，并测定了其酸密度和磁性能。将其用于纤维素水解时，其饱和磁化率为 35.28 emu-g-1，最大酸密度为 3.56 mmol-g-1。在 140 °C、酸与底物比为 1:1 的条件下，使用 Fe3O4@PS-SO3H 在 10 小时内水解纤维素，葡萄糖产率≤64.14%。五次循环后，它仍保持良好的催化活性。结论通过乳液聚合法制备的以聚苯乙烯为骨架的磁性固体酸具有高效稳定的催化性能，符合 "生物炼制 "的绿色发展趋势，为复合固体酸的开发奠定了基础。© 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.