Abstract
In the metal-based peroxymonosulfate(PMS)activation process,the sluggish surface redox cycle of metal ions generally hampered the efficiency of PMS activation for pollutant removal.Herein,Co-doped CuWO4/BN quantum dots(CW/Co/BNQDs)photocatalysts were developed to realize Cu2+/Cu+and Co2+/Co3+dual ions redox cycles for PMS activation,which would facilitate the tetracycline(TC)removal.CW/4Co/2BNQDs could degrade 94.8％TC within 30 min in PMS/Vis system,and the apparent rate con-stant of CW/4Co/2BNQDs was 2.7 times and 1.2 times higher than those of CW and CW/4Co,respectively.The improved TC degradation performance could be attributed to the synergetic effect between BNQDs and dual redox cycles.X-ray photoelectron spectroscopy(XPS)spectra of samples before and after the reaction demonstrated that BNQDs were beneficial for accelerating the Cu2+/Cu+and Co2+/Co3+redox cycles in CW/4Co/2BNQDs,further boosting the activation of PMS in TC degradation.Experiments of dif-ferent radical scavengers revealed that the SO4-/OH/h+/1O2 reactive species participated in the PMS activation for the TC degradation process.The possible TC degradation pathway and intermediate toxic-ity were detailed investigated.In addition,CW/4Co/2BNQDs exhibited outstanding photocatalytic activity over five consecutive cycles,which illustrated that it was supposed to be a reliable PMS activator over antibiotic elimination for practical application.And this work shed new light on constructing dual redox cycles for efficient PMS activation.
基金项目
国家自然科学基金(22172064)
Special Fund Project of Jiangsu Province for Scientific and Technological Innovation in Carbon Peaking and Carbon Neutrality(BK20220023)
foundation of Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,Jiangnan University(1042050205225990/009)
National Laboratory of Solid State Microstructures,Nanjing University(M34047)
江苏省"青蓝工程"项目()
NETL
NSTL
万方数据