Photocatalysis-self-Fenton system,i.e.,photo-catalytic H_(2)O_(2)generation and utilization in situ for OH radials production to remove organic pollutants with high-fluent degradation and mineralization performance po...Photocatalysis-self-Fenton system,i.e.,photo-catalytic H_(2)O_(2)generation and utilization in situ for OH radials production to remove organic pollutants with high-fluent degradation and mineralization performance pos-sesses such advantages as cleanliness,efficiency and safety.However,its degradation activity always suffers from the Fe(Ⅲ)/Fe(Ⅱ)cycle.For this reason,graphitic carbon interface-modified g-C_(3)N_(4)(CUCN)was fabricated to remarkably improve photocatalysis-self-Fenton degra-dation activity.The experiment results indicated that CUCN-2%photocatalyst,in which the loading percentage of graphitic carbon was 2%,demonstrated the optimum degradation performance among all the counterparts.The mineralization degree for RhB in 3 h over CUCN-2%reached 63.77%,nearly 3.35-fold higher than the pristine g-C_(3)N_(4).The significantly improved mineralization efficiency was ascribed to the promoted Fe(Ⅲ)/Fe(Ⅱ)cycle by photogenerated electrons,which leading to the higher utilization efficiency of H_(2)O_(2)through Fenton reaction,thereby producing more hydroxyl radicals.It is anticipated that our work could provide new insights for the design of photocatalysis-self-Fenton system with exceptional degradation performance for actual photocat-alytic applications.展开更多
基金financially supported by National Natural Science Foundation of China (No. 21906132)Department of Science and Technology of Sichuan Province (Nos. 2020YFG0158 and 2020YFH0162)Sichuan Provincial Engineering Laboratory of Livestock Manure Treatment and Recycling (Sichuan Normal University) (No. 202104)
文摘Photocatalysis-self-Fenton system,i.e.,photo-catalytic H_(2)O_(2)generation and utilization in situ for OH radials production to remove organic pollutants with high-fluent degradation and mineralization performance pos-sesses such advantages as cleanliness,efficiency and safety.However,its degradation activity always suffers from the Fe(Ⅲ)/Fe(Ⅱ)cycle.For this reason,graphitic carbon interface-modified g-C_(3)N_(4)(CUCN)was fabricated to remarkably improve photocatalysis-self-Fenton degra-dation activity.The experiment results indicated that CUCN-2%photocatalyst,in which the loading percentage of graphitic carbon was 2%,demonstrated the optimum degradation performance among all the counterparts.The mineralization degree for RhB in 3 h over CUCN-2%reached 63.77%,nearly 3.35-fold higher than the pristine g-C_(3)N_(4).The significantly improved mineralization efficiency was ascribed to the promoted Fe(Ⅲ)/Fe(Ⅱ)cycle by photogenerated electrons,which leading to the higher utilization efficiency of H_(2)O_(2)through Fenton reaction,thereby producing more hydroxyl radicals.It is anticipated that our work could provide new insights for the design of photocatalysis-self-Fenton system with exceptional degradation performance for actual photocat-alytic applications.
