Green synthesis of silver nanoparticles (AgNPs) has received increasing attention. In this study, AgNPs were prepared through in-situ reduction by aminated alkaline lignin (AAL). Compared with alkaline lignin (AL), AAL exhibited stronger reduction capacity (increased by 36%) due to the introduced amine groups and better water solubility. Moreover, the coordination effect of amine groups on AAL improved the binding force between lignin and AgNPs. The content of AgNPs in AgNPs/AAL composite were 2.4 times higher than that in AgNPs/AL, such content could be further increased through increasing the reduction pH or prolonging the heating time. The results of XPS, XRD and TEM showed that the AgNPs were spherical and monodisperse with an average particle size about 17 nm. Additionally, the size of AgNPs was affected by the amination degree of lignin. AgNPs/AAL exhibited good catalytic performance for the reduction of 4-nitrophenol to 4-aminophenol, and this compound could be easily recovered and reused for at least eight cycles.

银纳米颗粒（AgNPs）的绿色合成受到越来越多的关注。在这项研究中，AgNPs是通过胺化碱性木质素（AAL）原位还原制备的。与碱性木质素（AL）相比，由于引入的胺基和更好的水溶性，AAL表现出更强的还原能力（提高了36％）。此外，胺基对AAL的配位作用提高了木质素与AgNP之间的结合力。AgNPs / AAL复合材料中AgNPs的含量是AgNPs / AL中2.4倍，可以通过增加还原pH值或延长加热时间来进一步增加。XPS，XRD和TEM的结果表明，AgNP是球形的并且是单分散的，平均粒径约为17nm。另外，AgNP的大小受木质素的胺化程度影响。