This study evaluated the immobilization of Fe/Ni nanoparticles (Fe/Ni-NPs) on silica, bentonite and chitosan beads (CBs). The material generated by supporting Fe/Ni-NPs on CBs (Fe/Ni-CB) presented more advantageous characteristics for application in fluidized bed reactors (FBRs) than the others, such as high mechanical resistance and chemical stability. The Gates Gaudin and Schuman mathematical model was the best one to describe the particle size distribution of the CB-Fe/Ni, presenting an excellent fit to the experimental data. The particle size distribution of this material concentrated in a narrow diameter interval, making it possible to obtain a very representative Sauter mean diameter (1.92 mm) of the sample set. The CB-Fe/Ni presented high chemical stability, low leaching of Fe and Ni to the medium and stable hydrodynamic behavior under simulated application conditions. Therefore, CB-Fe/Ni presented desirable characteristics for use in FBRs as reactive bed material. The CB-Fe/Ni was used to degrade the Direct Red 80 (DR80) dye in an FBR. The factorial experiment results determined that the initial pH does not affect the DR80 removal, only the CB-Fe/Ni dose does. A model to predict the DR80 removal based on the CB-Fe/Ni dose was obtained. The DR80 removal by the CB-Fe/Ni performed in the FBR was higher than 60% at the end of 22 h. There was low leaching of Fe and Ni from the CB-Fe/Ni to the aqueous phase under the tested conditions, which corresponds to an advance because this technology does not generate secondary pollution in the system and facilitates the recovery of the used material.

中文翻译：

---

壳聚糖微珠负载的Fe / Ni纳米粒子在流化床反应器中降解直接红80染料

这项研究评估了Fe / Ni纳米颗粒（Fe / Ni-NPs）在二氧化硅，膨润土和壳聚糖微珠（CBs）上的固定性。通过将Fe / Ni-NPs负载在CB上而产生的材料（Fe / Ni-CB）具有更高的机械耐受性和化学稳定性，这些特性使其在流化床反应器（FBR）中的应用更具优势。盖茨·高丁和舒曼的数学模型是描述CB-Fe / Ni粒度分布的最佳模型，非常适合实验数据。该材料的粒度分布集中在狭窄的直径范围内，从而有可能获得非常有代表性的样品集的Sauter平均直径（1.92 mm）。CB-Fe / Ni具有很高的化学稳定性，在模拟应用条件下，铁和镍向介质的浸出率低，并且流体力学性能稳定。因此，CB-Fe / Ni具有理想的特性，可用于FBR中作为反应床材料。CB-Fe / Ni用于降解FBR中的直接红80（DR80）染料。析因实验结果确定初始pH值不会影响DR80的去除，只有CB-Fe / Ni剂量会影响。获得了基于CB-Fe / Ni剂量预测DR80去除的模型。在22小时结束时，在FBR中通过CB-Fe / Ni去除DR80高于60％。在测试条件下，Fe和Ni从CB-Fe / Ni到水相的浸出率低，这是一项进步，因为该技术不会在系统中产生二次污染，并且有助于回收用过的材料。