Nanozymes have developed rapidly as substitutes for natural enzymes. However, the toxic synthesis and the use of expensive materials seriously restrict their large-scale applications. To solve these issues, Fe3+-doped aminated lignin (Fe-AL) peroxidase-mimicking nanozymes were innovatively synthesized. The active center FeNxwas introduced to alkali lignin by amination via Mannich or epoxidation methods before Fe3+-doping. The Fe-AL nanozymes could achieve accurate colorimetric detection of H2O2in 10-100 m and could be reused over 30 times with only a negligible decrease in catalytic activity. Besides, the color-developing systems could even maintain the blue color over 72 h, which showed great promise in designing cheap and portable H2O2sensors. This work not only can promote the development of lignin-based nanomaterials but also provide a new way for the synthesis of nanozymes from natural macromolecules.
Bibliographical noteFunding Information:
We are grateful for the financial support by the “World-Class Discipline Construction and Characteristic Development Guidance Funds for Beijing Forestry University” (2019XKJS0330) and the Natural Science Foundation of China (No. 31470606).
© 2021 American Chemical Society
- alkali lignin
- peroxidase mimics