氮掺杂粉煤灰磁珠@碳纳米管的制备及活化过硫酸盐去除罗丹明B试验研究  

Preparation of nitrogen-doped fly ash magnetic beads@carbonnanotubes and experimental study of rhodamineB removal by activated persulfate

作　　者：刘冰[1] 张晓民[1] 陈天星 贺攀阳 LIU Bing;ZHANG Xiaomin;CHEN Tianxing;HE Panyang(School of Resource Engineering,Xi’an University of Architecture and Technology,Xi’an Shaanxi 710055,China)

机构地区：[1]西安建筑科技大学资源工程学院,陕西西安710055

出　　处：《化工矿物与加工》2024年第8期1-8,共8页Industrial Minerals & Processing

基　　金：国家自然科学基金项目(51671153);咸阳市科技局重点研发计划项目(2021ZDYF-GY-0034)。

摘　　要：近年来,氮掺杂碳材料因无金属浸出和良好的过硫酸盐活化能力而受到越来越多的关注,但其存在易团聚、回收难等问题。本文利用燃煤废料粉煤灰磁珠的磁性和易于回收的特点,通过化学气相沉积法和水热法合成高缺陷氮掺杂碳纳米(MSs@N-CNTs)。采用扫描电子显微镜(SEM)、X射线衍射(XRD)、X射线光电子光谱学(XPS)、拉曼光谱(Raman spectra)、比表面分析仪(BET)等手段对MSs@N-CNTs的成分和微观结构进行了分析。并以罗丹明B(Rh B)为目标污染物,探究了不同掺氮量以及催化剂、过单硫酸盐(PMS)用量、温度、pH等因素对降解的影响。结果表明:在中性室温条件下,60 mL初始浓度为50 mg/L的Rh B溶液中,当催化剂用量为0.4 g/L、PMS用量为5 mg/L时,40 min内MSs@N-CNTs/PMS体系降解Rh B的效率可达99.2%;MSs@N-CNTs在去除污染物3个循环后降解率仍高达72%;MSs@N-CNTs的饱和磁化值为18.47 emu/g,在外加磁场的作用下可迅速从溶液中分离。本研究成果为粉煤灰磁珠在催化领域的高值利用提供了一条新途径。In recent years,nitrogen-doped carbon materials have received more and more attention because of their non-metal leaching and good persulfate activation ability.But they also face some problems,such as easy reunion and difficult recovery.In this paper,nitrogen doped carbon nanoparticles(MSs@N-CNTs)with high defects were synthesized by chemical vapor deposition(CVD)and hydrothermal method using the magnetic properties of fly ash beads,which were easy to recover.The composition and microstructure of MSs@N-CNTs were studied by means of SEM,XRD,XPS,Romman and BET.Taking Rhodamine B(Rh B)as the target pollutant,the effects of different nitrogen content,catalyst,permonosulfate(PMS)dosage,temperature and pH on the degradation were investigated.The results showed that at neutral room temperature,60 mL of Rh B solution with an initial concentration of 50 mg/L at neutral room temperature,when the dosage of catalyst was 0.4 g/L and the dosage of PMS was 5 mg/L,The degradation efficiency of Rh B by MSs@N-CNTs/PMS system could reach 99.2%within 40 min.MSs@N-CNTs The degradation rate is still as high as 72%after 3 cycles of removal of pollutants.MSs@N-CNTs had a saturation magnetization value of 18.47 emu/g and could be rapidly separated from solution under the action of an applied magnetic field.The results of this study provide a new path for the high value utilization of fly ash magnetic beads in the catalytic field.

关 键 词：粉煤灰磁珠 碳纳米管材料 染料废水 氮掺杂 过硫酸盐 降解 催化剂 

分 类 号：TQ536.4[化学工程—煤化学工程]