Abstract In this paper we discuss the potential use of (Fe3O4@SiO2-SO3H) nanoparticle catalyst for the dehydration of glucose into 5-hydroxymethylfurfural (HMF). A magnetically recoverable (Fe3O4@SiO2-SO3H) nanoparticle catalyst was successfully prepared by supporting sulfonic acid groups (SO3H) on the surface of silica-coated Fe3O4 nanoparticles. The prepared catalyst was characterized by FTIR, TGA, XRD, HRTEM-EDX, and N2 adsorption-desorption isothermal analyses. The catalyst’s surface acidity was determined by acid-base titration. Dehydration of glucose was performed in a biphasic system made up of water and methylisobutylketone (water/MIBK), and the effect of various reaction parameters affecting on the yield of HMF such as biphasic system ratio, catalyst concentration, temperature, time, and dimethylsulfoxide (DMSO) ratio were studied. Fe3O4@SiO2-SO3H catalyst disclosed a great catalytic activity for the formation of HMF and glucose conversion. About 70% yield of HMF and 98% glucose conversion were obtained at the optimum reaction conditions (40% catalyst concentration, 140 °C, 24 h and biphasic system of 1:4 (water: MIBK) ratio). At the end of the reaction, the catalyst was easily removed from the reaction mixture using a magnet and reused several times without high loss in catalytic activity.

中文翻译：

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核壳Fe 3 O 4 @SiO 2 -SO 3 H磁性纳米颗粒催化剂将葡萄糖脱水为5-羟甲基糠醛

摘要 在本文中，我们讨论了 (Fe3O4@SiO2-SO3H) 纳米颗粒催化剂在葡萄糖脱水生成 5-羟甲基糠醛 (HMF) 中的潜在用途。通过在二氧化硅包覆的 Fe3O4 纳米粒子表面负载磺酸基 (SO3H) 成功制备了磁性可回收 (Fe3O4@SiO2-SO3H) 纳米粒子催化剂。通过FTIR、TGA、XRD、HRTEM-EDX和N2吸附-解吸等温分析对制备的催化剂进行了表征。催化剂的表面酸度通过酸碱滴定法测定。葡萄糖的脱水在由水和甲基异丁基酮（水/MIBK）组成的双相体系中进行，影响HMF产率的各种反应参数如双相体系比例、催化剂浓度、温度、时间和二甲亚砜（ DMSO)比率进行了研究。Fe3O4@SiO2-SO3H催化剂对HMF的形成和葡萄糖转化具有很好的催化活性。在最佳反应条件（40% 催化剂浓度、140 °C、24 h 和 1:4（水：MIBK）比例的双相体系）下，HMF 产率约为 70%，葡萄糖转化率为 98%。在反应结束时，使用磁铁可以很容易地将催化剂从反应混合物中除去，并可重复使用多次，而催化活性不会有很大损失。