Abstract:
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 NH2-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 bisphenol 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,SO4 ·-,·OH,O2 ·- and 1O2 all existed in Fe-CNs-900/PS system,but SO4 ·- and 1O2 played a major role in the degradation of BPS.
Key words:
persulfate,
NH2-MIL-101(Fe),
iron-nitrogen doped carbon composites,
bisphenol S
摘要:
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NH2-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,SO4 ·-、·OH、O2 ·-和1O2均存在于Fe-CNs-900/PS体系中,但SO4 ·-和1O2对BPS的降解起主要作用。
关键词:
过硫酸盐,
NH2-MIL-101(Fe),
铁-氮掺杂碳复合材料,
双酚S
CLC Number:
Zhen LIU, Ruidian SU, Qian LI. Degradation of bisphenol S by activated persulfate by iron-nitrogen doped carbon composites[J]. Industrial Water Treatment, 2022, 42(11): 127-135.
刘震, 苏瑞典, 李倩. 铁-氮掺杂碳复合材料活化过硫酸盐降解双酚S[J]. 工业水处理, 2022, 42(11): 127-135.