The exploration of inexpensive and stable heterogeneous catalysts and application of green solvents for Ullmann CN coupling reaction remain challenging. We present a facile fabrication of copper nanoparticles on hydrochar as prepared from natural, inexpensive and renewable chitosan together with in-situ reduction of copper salt in a one-pot hydrothermal carbonization process. The copper nanoparticles were uniformly dispersed on hydrochar by choosing block copolymer F127 as surfactant. Moreover, maleic acid was introduced to improve the hydrophilicity of hydrochar. The most active copper nanocomposite catalyst, that is, Cu/HCS-MA-F127, exhibited excellent catalytic activity for Ullmann CN coupling reaction in water. The nature of the Cu/HCS-MA-F127 was characterized by FTIR spectroscopy, TG, XRD, SEM and XPS. Moderate to excellent yields of aimed products were gained by using this catalytic strategy. Moreover, the Cu/HCS-MA-F127 catalyst can be reused by simple centrifugal recovery with a stable performance.

廉价和稳定的多相催化剂的探索以及绿色溶剂在Ullmann C N偶联反应中的应用仍然具有挑战性。我们提出了一种由天然，廉价和可再生的壳聚糖在水炭上轻松制备铜纳米颗粒的方法，以及在一锅水热碳化过程中原位还原铜盐的方法。通过选择嵌段共聚物F127作为表面活性剂，将铜纳米颗粒均匀地分散在烃上。此外，引入马来酸以改善烃的亲水性。活性最高的铜纳米复合催化剂Cu / HCS-MA-F127对Ullmann C表现出优异的催化活性N在水中的偶联反应。Cu / HCS-MA-F127的性质通过FTIR光谱，TG，XRD，SEM和XPS表征。通过使用这种催化策略，获得了中等至极好的目标产品收率。此外，Cu / HCS-MA-F127催化剂可通过简单的离心回收再利用，具有稳定的性能。