摘要
以碳化三聚氰胺泡沫为载体,原位生长金属有机框架化合物ZIF-67,构建碳化三聚氰胺泡沫负载ZIF-67高效非均相催化剂(CMF/ZIF-67)。采用X-射线衍射仪(XRD)、氮气吸附仪、扫描电子显微镜(SEM)对CMF/ZIF-67的晶体结构、比表面积和形貌进行分析,并以罗丹明B(RhB)为降解物评价催化剂活化过硫酸氢钾(PMS)的反应活性。结果表明:CMF/ZIF-67非均相催化剂显示出非常强的活化PMS能力,在30 min内RhB降解率为98%。另外,研究了催化剂投加量、PMS投加量、pH值、温度及RhB初始浓度对CMF/ZIF-67/PMS体系降解RhB的影响。结果表明:随着催化剂和PMS投加量的增加,RhB的降解率也增大;溶液初始pH在5~7范围内时RhB的降解率可达98%以上;温度对RhB降解速率的影响符合阿伦尼乌斯模型,降解过程是一个表面反应控制过程。自由基捕获实验结果表明硫酸根自由基是RhB降解的主要活性自由基。经过四次循环使用后催化剂体系对RhB的降解率仍达到90%以上,催化剂具有优异的循环稳定性,在降解染料废水领域具有潜在的应用前景。
In this work, an efficient heterogeneous catalyst was prepared through in-situ growth of ZIF-67 on carbonized melamine foam. The crystal structure, specific surface area and morphology of CMF/ZIF-67 were characterized by X-ray diffraction(XRD), nitrogen adsorption apparatus and scanning electron microscopy(SEM). Rhodamine B(RhB) degradation was employed as a model test for evaluating potassium peroxymonosulfate(PMS) activation. The results show that the CMF/ZIF-67 heterogeneous catalyst exhibites excellent efficiency for PMS activation, and the degradation rate of RhB is up to 98% in 30 min. The other factors which could influence PMS activation were also analyzed as well, for instance, catalyst dosage, PMS dosage, pH value, temperature and RhB concentration. The experimental results show that the degradation efficiency of RhB also increases with the increase of the dosage of CMF/ZIF-67 and PMS. The degradation rate of RhB can reach more than 98% in the initial pH range of 5-7. The effect of temperature on the degradation rate of RhB conforms to the Arrhenius model, and the degradation process is a surface reaction controlled process. The results of the free radical capture experiment show that the sulfate radicals are the dominant active species for RhB degradation. After four cycles, the degradation rate of RhB still maintains above 90% with CMF/ZIF-67 catalyst. The catalyst has potential application in the field of degradation of dye wastewater due to its excellent cycling stability.
作者
王渊源
阎鑫
艾涛
周鑫
余康
牛艳辉
WANG Yuanyuan;YAN Xin;AI Tao;ZHOU Xin;YU Kang;NIU Yanhui(School of Materials Science and Engineering,Chang'an University,Xi'an 710064,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2022年第17期189-195,共7页
Materials Reports
基金
陕西省国际科技合作项目(2018KW-052)
中央高校基本科研计划项目(300102310301)
大学生创新创业项目。
关键词
碳化三聚氰胺泡沫
ZIF-67
过硫酸氢钾
非均相催化
高级氧化
carbonized melamine foam
ZIF-67
potassium peroxymonosulfate
heterogeneous catalyst
advanced oxidation process
