In the heterogeneous electro-Fenton(Hetero-EF)process,the generation and activation efficiency of hydrogen peroxide(H_(2)O_(2))is an important factor affecting the performance.Based on ability of Mxene to regulate cha...In the heterogeneous electro-Fenton(Hetero-EF)process,the generation and activation efficiency of hydrogen peroxide(H_(2)O_(2))is an important factor affecting the performance.Based on ability of Mxene to regulate charge density at metal active sites and enhance electronic transport efficiency,a nanoflower-shaped CoSe and plate-shaped Ti_(3)C_(2) composite(CoSe/Ti_(3)C_(2))was developed for use as a Hetero-EF cathode catalyst.The results showed that CoSe/Ti_(3)C_(2) had excellent degradation performance,with a sulfamerazine(SMR)(10 mg·L^(-1))degradation efficiency of 100%within 80 min in the pH range of 3–7.CoSe/Ti_(3)C_(2)(n=2.59)had a lower transfer electron number compared to that of CoSe(n=3.21)and was more inclined towards 2e-ORR.Theoretical calculations showed that Ti_(3)C_(2) regulated the d-band center of CoSe,weakening adsorption strength of Co sites for the*OOH intermediate and making it more inclined to generate H_(2)O_(2).Electron paramagnetic resonance(EPR)and quenching experiments indicated the presence of*OH,*O_(2)^(-),and 1O_(2)in the system,all of which participated in the degradation of pollutants.The construction of a multi reactive oxygen species system enhanced the interference resistance during degradation.展开更多
基金the financial support from the National Natural Science Foundation of China(Grant No.22278431).
文摘In the heterogeneous electro-Fenton(Hetero-EF)process,the generation and activation efficiency of hydrogen peroxide(H_(2)O_(2))is an important factor affecting the performance.Based on ability of Mxene to regulate charge density at metal active sites and enhance electronic transport efficiency,a nanoflower-shaped CoSe and plate-shaped Ti_(3)C_(2) composite(CoSe/Ti_(3)C_(2))was developed for use as a Hetero-EF cathode catalyst.The results showed that CoSe/Ti_(3)C_(2) had excellent degradation performance,with a sulfamerazine(SMR)(10 mg·L^(-1))degradation efficiency of 100%within 80 min in the pH range of 3–7.CoSe/Ti_(3)C_(2)(n=2.59)had a lower transfer electron number compared to that of CoSe(n=3.21)and was more inclined towards 2e-ORR.Theoretical calculations showed that Ti_(3)C_(2) regulated the d-band center of CoSe,weakening adsorption strength of Co sites for the*OOH intermediate and making it more inclined to generate H_(2)O_(2).Electron paramagnetic resonance(EPR)and quenching experiments indicated the presence of*OH,*O_(2)^(-),and 1O_(2)in the system,all of which participated in the degradation of pollutants.The construction of a multi reactive oxygen species system enhanced the interference resistance during degradation.
