AgNPs/NSRGO nanocomposite was firstly synthesized by facile two-step methods, exhibiting higher visible-light catalytic performance than GO and commercial TiO₂ (P25). According to the reaction rate constant, AgNPs/NSRGO shows 8.3 and 5.3 times photoactivity compared to P25 for degrading methylene blue and 4-nitrophenol, respectively. Furthermore, the nanocomposite kills 98.6% of Escherichia coli in 3 h while P25 only 27.4%. We also infer that the improved photoactivity is attributed to the impurity levels of heteroatoms and plasmonic effect from AgNPs, resulting in narrowing bandgap of composite, efficient separation of charge carriers and generation of more reactive oxygen species.

AgNPs / NSRGO纳米复合材料首先通过简便的两步法合成，具有比GO和市售TiO ₂（P25）更高的可见光催化性能。根据反应速率常数，AgNPs / NSRGO的光活性是P25降解亚甲基蓝和4-硝基苯酚的8.3倍和5.3倍。此外，纳米复合材料在3小时内杀死了98.6％的大肠杆菌，而P25仅杀死了27.4％。我们还推断出，改善的光活性归因于杂原子的杂质水平和AgNPs的等离激元效应，从而导致复合材料的带隙变窄，电荷载流子的有效分离以及更多活性氧的产生。