A new FeOCl/graphene quantum dot catalyst for peroxymonosulfate activation to efficiently remove organic pollutants and inactivate Escherichia coli
The sulfate radical-based advanced oxidation processes (SR-AOPs) are well-established and efficient techniques for the degradation of organic pollutants. Fe2+ is used as an environmentally friendly and cost-effective catalyst for activating peroxymonosulfate (PMS) to generate sulfate radicals (SO4−˙). In some past studies, the slow process of reducing Fe3+ to Fe2+ reduced the overall reaction rate of the SR-AOP system. To overcome this challenge, in this work, we for the first time fabricated a new composite activator, FeOCl decorated by graphene quantum dots (GQDs), by a facile method for activating PMS. The experimental results demonstrate that the as-prepared FeOCl/GQD catalysts can efficiently degrade organic pollutants and kill Escherichia coli through activating PMS to generate active species. Notably, the FeOCl/(16.7 wt%) GQD composite can activate PMS to degrade organics (97.8% of RhB within 30 min) and inactivate E. coli (99.1% within 10 min) with a pH range from 3 to 11. Moreover, mechanism analyses showed that the active species were SO4−˙, ˙OH, 1O2 and O2−˙ in the FeOCl/(16.7 wt%) GQDs + PMS system, and SO4−˙ and 1O2 were proved to be the main active species. The addition of GQDs promoted the reduction of Fe3+ to Fe2+, thereby accelerating the degradation rate. Our study suggests that the promising strategy of exploiting highly efficient AOP platforms has many applications.
危险品化学品经营许可证（带存储）