Natural keratin-based Fe-S1N3 single atom catalyst for insights into the coordination regulation effect of Fenton-like catalysis with high efficiency
Zhiyi Sun, Yujuan Wei, Ting Cao, Zheng Liu, Rui Sui, Xiang Li, Jiajing Pei, Zhuo Chen, Shuo Wang
Abstract
Single atom catalysts (SACs) have attracted great attention, yet the quest for highly-efficient catalysts is driven by the current obstacles of ambiguous structure-performance relationship. Here, we report a nature keratin-based Fe-S1N3 SACs with ultrathin two-dimensional (2D) porous carbon nanosheets structure, by controlling the active center through the precise coordination of sulfur and nitrogen. Compared with natural silk-based Fe-N4 catalyst, the Fe-S1N3 SACs exhibit excellent Fenton-like oxidation degradation ability. X-ray absorption fine structure (XAFS) and electron paramagnetic resonance (EPR) results confirm that S doping is conducive to electron transfer, to accurately generate·OH with high oxidative degradation capacity at the active site. Therefore, the optimized Fe-S1N3 catalyst showed higher oxidation degradation activity for organic pollutant substrates (methylene blue (MB), Rhodamine B (RhB) and phenol), significantly superior to Fe-N4 samples. This work is devoted to the treatment and application of natural fibers, which provides a novel method for the synthesis of SACs and the regulation of atomic coordination environment.