铁-氮掺杂碳复合材料活化过硫酸盐降解双酚S

Degradation of bisphenol S by activated persulfate by iron-nitrogen doped carbon composites

非均相铁基材料活化过硫酸盐(PS)是高级氧化工艺中高效活化过硫酸盐的重要手段,如何有效提高铁基催化剂的催化性能一直是研究重点。碳基材料因其丰富而稳定的多孔结构常被用于负载铁活性组分。以一种氨基修饰的铁基金属有机框架化合物NH_(2)-MIL-101(Fe)为模板,采用一步碳化法制备了铁-氮掺杂碳复合材料(Fe-CNs),通过X射线衍射、扫描电镜和透射电镜等表征手段对Fe-CNs的形貌特征和化学组成进行了分析,并进一步研究了Fe-CNs活化过硫酸盐降解双酚S(BPS)的性能。结果表明,在900℃下制备的Fe-CNs-900通过活化PS在70 min内可降解99.3%的BPS,Fe-CNs-900/PS体系具有良好的抵抗共存阴离子和腐殖酸(HA)影响的能力。自由基捕获实验和EPR分析表明,SO_(4)^(·-)、·OH、O_(2)^(·-)和^(1)O_(2)均存在于Fe-CNs-900/PS体系中,但SO_(4)^(·-)和^(1)O_(2)对BPS的降解起主要作用。

The activation of persulfate(PS)by heterogeneous iron-based materials is an important means to activate persulfate efficiently in advanced oxidation processes.How to effectively improve the catalytic performance of iron-based catalyst has always been the focus of research.Carbon-based materials are often used to support iron active components because of their rich and stable porous structures.Iron-nitrogen doped carbon composites(Fe-CNs)were prepared by one-step carbonization using an amino-modified iron-based metal organic frame compound NH_(2)-MIL-101(Fe)as a template,and the morphology and chemical composition of the catalysts were characterized by X-ray diffraction,scanning electron microscopy,transmission electron microscopy and so on.The degradation of bi⁃sphenol S(BPS)by Fe-CNs activated persulfate(PS)was further studied.The results showed that the Fe-CNs-900 prepared at 900℃could degrade 99.3%BPS in 70 min by activating PS,and the Fe-CNs-900/PS system had good resistance to the influence of coexisting anions and humic acids.The quenching experiment and EPR analysis showed that,SO_(4)^(·-),·OH,O_(2)^(·-)and^(1)O_(2)all existed in Fe-CNs-900/PS system,but SO-(4)^(·-)and^(1)O_(2)played a major role in the degradation of BPS.