Bifunctional Fe3O4 nanoparticles as magnet and inducer in bioextruded fabrication of starch-based composite with hierarchical pore architecture

• Published in: International journal of biological macromolecules Vol. 190; pp. 876 - 886
• Main Authors: Xu, Enbo, Ma, Shuohan, Wu, Zhengzong, Wang, Wenjun, Zhang, Ximing, Tian, Jinhu, Li, Dandan, Zhou, Jianwei, Liu, Donghong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-11-2021
• Subjects: Bio-based metal-organic coordination polymer (MOCP); Contaminant removal; Fe3O4 NPs; Green extrusion; Hierarchical pore structure; Modified starch; Bio-based metal-organic coordination polymer (MOCP); Modified starch; Green extrusion; Hierarchical pore structure; Fe3O4 NPs; Contaminant removal
• ISSN: 0141-8130; 1879-0003
• DOI: 10.1016/j.ijbiomac.2021.09.050

Starch (St) was used as green and renewable matrix (> 80%, db) for the preparation of Zn-St-MOCP/nFe3O4 composite via bioextrusion. Bifunction of Fe3O4 NPs as magnet and pore-inducer was confirmed and could be more homogeneously embedded in the St-based framework with hierarchical porous structure via SEM-EDS mapping. For the nFe3O4-induced microstructure of Zn-St-MOCP/nFe3O4 composite, submicronic pores and nanopores were observed with Fe3O4 NPs onto the inner surface of micron channels. According to the XPS, XRD, FTIR, TGA analyses, it is probably due to the coordination between Fe3+/2+ and Zn2+/hydroxy groups and the recombination of St chains in crystalline/amorphous zones interfered by Fe3O4 NPs. Saturation magnetization value was measured with an excellent separation behavior. Seven kinetic equations were conducted for the fitting of dye adsorption data. Overall, the nFe3O4-assisted bioextrusion strategy is developed for the continuous fabrication of bio-based materials with rapid magnetic separation and hierarchical-pore architecture promising in practical adsorption.
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•Fe3O4 NPs improved the creation of hierarchical pores in bioextruded composite.•St as bioresource was used for over 80% of matrix embedded with magnetic Fe3O4 NPs.•Structure of St chains were changed with modified coordination of C, O, Fe, Zn.•Physisorption mechanism was confirmed for main dye transfer by kinetic models.