摘要
开发用于高级氧化技术的廉价易得、高效稳定的催化剂对于水处理至关重要.以水滑石/壳聚糖为前驱体开发了一种新型“原位沉淀-煅烧”法制备磁性氮掺杂碳负载CoFe_(2)O_(4)-CoO催化剂(LDO/NC).该催化剂用于活化过一硫酸盐(PMS)降解四环素(TC),表现出明显优于单纯水滑石氧化物(LDO)和氮掺杂碳(NC)的催化活性.这是由于壳聚糖作为碳源和氮源的原位引入成功抑制了钴铁金属氧化物团聚,同时N原子的掺杂增强电子转移,协同催化提高活性.研究了催化剂组成、催化剂用量、PMS用量和初始pH值等因素对TC降解效率的影响规律.最佳条件下(PMS用量0.4 g L^(-1),LDO/NC用量0.5 g L^(-1),pH=5),30 min内TC的降解率和总碳去除率分别达到97.8%和81.0%.该催化剂可磁性回收且循环使用五次以上,稳定性保持良好.提供了一种用于催化PMS氧化处理制药废水的绿色催化剂.
The development of inexpensive,efficient and stable catalysts for advanced oxidation technologies is essential for water treatment.In this study,a novel"in-situ precipitation-calcination"method was developed using hydrotalcite/chitosan as the precursor to prepare a magnetic nitrogen-doped carbon supported CoFe_(2)O_(4)-CoO catalyst(LDO/NC).The catalyst was used to activate peroxymonosulfate(PMS)for tetracycline degradation,and it showed significantly better catalytic activity than naked hydrotalcite oxide(LDO)and nitrogen-doped carbon(NC).As a carbon and nitrogen source,the in-situ incorporation of chitosan effectively suppressed the agglomeration of cobalt-iron metal oxide.Meanwhile,the N atom enhanced electron transfer,thus improving the catalytic activity.The effects of catalyst composition,catalyst dosage,PMS dosage and initial pH value on the degradation efficiency of TC were also investigated.Under the optimal conditions(PMS dosage 0.4 g L^(-1),LDO/NC dosage 0.5 g L^(-1),pH=5),the degradation efficiency and total carbon removal rate of TC within 30 min reached 97.8%and 81.0%,respectively.The catalyst can be magnetically recovered and reused for more than five times with good stability.This study provides a promising green catalyst for the PMS-assisted degradation of pharmaceutical wastewater.
作者
杨金帆
牛晓茹
张素风
YANG Jin-fan;NIU Xiao-ru;ZHANG Su-feng(National Demonstration Center for Light Chemistry Engineering Education, Shaanxi Province Key Laboratory of Papermaking Technology and Specialty Paper, Shaanxi University of Science & Technology, Xi′an 710021, China)
出处
《陕西科技大学学报》
北大核心
2022年第2期74-80,共7页
Journal of Shaanxi University of Science & Technology
基金
国家自然科学基金项目(22002078)。
