氮掺杂生物炭(N/BC)活化过硫酸盐机理研究

Study on mechanism of N-doped biocarbon(N/BC)toward activating persulfate

高温煅烧生物炭(BC)和三聚氰胺的混合物制备了氮掺杂生物炭(N/BC),采用拉曼、XPS、SEM、FTIR等方法对样品进行了系统的表征分析。通过活化过二硫酸钠(PDS)降解染料溴甲酚绿探讨了材料的催化性能。研究发现N掺杂可以显著提高BC的活化性能;N/BC10的催化性能相对于BC和N/BC0分别提高了82和31倍;ESR测试和猝灭实验证实体系主要的活性物质为单线态氧(^(1)O_(2)),在反应体系中没有产生硫酸根自由基(SO_(4)^(·-))和羟基自由基(·OH)。

N-doped biochar(N/BC)was prepared by pyrolysis the mixture of biochar(BC)and melamine at high temperature.The physical properties were systematically explored with Raman,XPS,SEM,FTIR and BET.The catalytic performance of the product was evaluated by degradation of dye bromocresol green(BCG)with BC or N/BC as catalysts to activate peroxydisulfate(PDS).The results demonstrated that the catalytic performance of N/BC10 was 82 and 31 times that of the BC and N/BC0,respectively.ESR test and quenching test verified that sulfate radical SO_(4)^(·-)and hydroxyl radical(·OH)are not produced in the reaction system,and the main active species of the system is singlet oxygen(^(1)O_(2)).