在超分子水凝胶中负载Ni²⁺，再添加NaBH₄原位还原制备得到纳米镍。利用EDS、SEM、TEM及流变等方法对复合催化剂进行结构和性能表征，结果发现纳米镍尺寸约为5~10 nm，均匀分散于水凝胶中，复合催化剂具有良好的自修复能力。利用UV-Vis研究了其在催化还原4-NP中的性能，通过对反应随时间的变化及在不同温度下的催化性能研究发现，该反应动力学数据符合一级反应特征，表观速率常数与反应温度呈线性关系，催化剂重复使用6次后仍然保持了良好的催化性能。

Ni nanoparticles are obtained through in-situ reduction of Ni²⁺ by NaBH₄ within supramolecular hydrogels.The structures and properties of the composite catalysts are characterized by EDS, SEM, TEM and rheological method.It is found out that Ni nanoparticles have a size of 5-10 nm, and disperse homogeneously in 3D hydrogel matrix.The composite catalysts behave self-healing property.The performance of the composite catalysts in catalytic reduction of 4-nitrophenol are studied by means of UV-Vis spectroscopy, and the impact of reaction time and temperature on the catalytic performance are also studied.Results show that the reaction kinetic data accord with the pseudo-first order reaction, there is linear relationship between apparent rate constant and reaction temperature.The composite catalysts still maintain good catalytic performance after being reused for 6 times.

张以民(2000-),男,本科生,研究方向为超分子化学,bdcmzym@163.com。