Enhanced catalytic activity of nanosilver with lignin/polyacrylamide hydrogel for reducing p-nitrophenol
Enhanced catalytic activity of nanosilver with lignin/polyacrylamide hydrogel for reducing p-nitrophenol
复制标题
木质素/聚丙烯酰胺水凝胶增强纳米银还原对硝基苯酚的催化活性
DOI：
10.1016/j.ijbiomac.2019.05.017
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发表时间：
2019
影响因子：
8.2
通讯作者：
An Qingda
中科院分区：
文献类型：
--
作者：
Gao Ce;Wang Xuelian;Zhai Shangru;An Qingda
木质素作为自然界中第二大天然聚合物，具有很大的实际应用价值。通过快速便捷的组装工艺成功制备了三维银/木质素/PAM水凝胶，在对硝基苯酚的间歇和动态催化过程中表现出良好的催化加氢能力和稳定性。从表征结果可以看出，在硼氢化钠还原过程中，催化剂载体中丰富的氨基可以均匀分散银离子，限制银纳米粒子的生长。在室温下，使用该催化剂可在5 min左右完成催化过程，在动态催化实验中可保持100 min左右的高效催化，转化率可达80%左右。经10次使用后，催化剂仍保持良好的催化性能，转化率可保持在97%。
Lignin, as the second largest natural polymer in nature, has great practical application value. Three-dimensional silver/lignin/PAM hydrogels have been successfully preparedviaa rapid and convenient assembly process, showing good catalytic hydrogenation ability and stability in batch and dynamic catalytic processes ofp-nitrophenol. It can be seen from the characterization results that abundant amino groups in the catalyst carrier can disperse silver ions homogeneously and limit the growth of silver nanoparticles in the reduction process with sodium borohydride. At room temperature, the catalytic process can be completed in about 5 min by using this catalyst and can maintain about 100 min of efficient catalysis in the dynamic catalytic experiment, the conversion rate can reach about 80%. After 10 times use, the catalyst still maintained good catalytic performance and the conversion rate could be kept at 97%.