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 Fe^3+/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.

淀粉 (St) 用作绿色和可再生基质（> 80%，db），用于通过生物挤出制备 Zn-St-MOCP/nFe ₃ O ₄复合材料。Fe ₃ O ₄ NPs 作为磁铁和孔隙诱导剂的双功能得到证实，并且可以通过 SEM-EDS 映射更均匀地嵌入具有分级多孔结构的基于 St 的框架中。对于nFe ₃ O ₄诱导的Zn-St-MOCP/nFe ₃ O ₄复合材料的微观结构，Fe ₃ O ₄观察到亚微米孔和纳米孔纳米颗粒到微米通道的内表面。根据 XPS、XRD、FTIR、TGA 分析，这可能是由于 Fe ^3+/2+和 Zn ²⁺ /羟基之间的配位以及晶体/非晶区中 St 链的重组受到 Fe ₃ O _{4 的}干扰NP。测量饱和磁化强度值时具有优异的分离性能。进行了七个动力学方程来拟合染料吸附数据。总的来说，nFe ₃ O ₄辅助生物挤出策略是为连续制造生物基材料而开发的，这些材料具有快速磁分离和分级孔结构，在实际吸附中很有前景。