摘要
部分具有毒性与致癌性的罗丹明染料被违法用于食品中,危害人们的生命健康,需要研究有效的处理方法用于此类染料的检测。磁性碳纳米管具有可磁性分离、比表面积大的优点,选择磁性碳纳米管作预处理材料可以增大吸附剂的吸附容量、提高吸附分离效率。本工作采用改进溶剂热法合成了磁性碳纳米管,并将其用于水溶液中丁基罗丹明B(BRB)染料的吸附。使用透射电子显微镜对磁性碳纳米管的形貌进行了表征,结果显示碳纳米管与四氧化三铁纳米粒子均匀分布。吸附实验表明,吸附容量随pH值的增大而略有增大,当吸附剂加入量为0.50 mg·mL^(-1)时吸附容量最高。动力学吸附实验表明,吸附在45 min后达到平衡,吸附更符合准二阶动力学模型。热力学吸附实验表明,BRB初始浓度为50μg·mL^(-1)时吸附量到达最高水平,吸附过程更符合Langmuir模型。上述实验结果表明,磁性碳纳米管对BRB具有较好的吸附性能,磁性碳纳米管可应用于水溶液中BRB的吸附。
Partial toxicity and carcinogenic rodamin dyes are illegally used in food which endange people live and health.Effective treatment methods need to be studied to detect the dyes.Magnetic carbon nanotubes have the advantages of magnetic separation and large specific surface area,which can increase adsorption capacity and improve separation efficiency as pretreatment material.This work used the improved solvent heating method to synthesize magnetic carbon nanotubes,which was used in the adsorption of butyl rhodamine B dye in the aqueous solution.The morphology of magnetic carbon nanotubes was characterized by transmitting electron microscopy,and the carbon nanotubes and Fe_(3)O_(4) nanoparticles in magnetic carbon nanotubes were observed uniformly distributed.Adsorption experiments showed that the adsorption capacity was maximum when the amount of adsorbent was 0.50 mg·mL^(-1),And the adsorption capacity was increasing with the increase of pH value in solution.Dynamic adsorption experiment showed that the adsorption was equilibrated after 45 min,and it was more conforming to the pseudo-second-order model.Thermodynamic adsorption experiment showed that the adsorption amount reached the highest level when the initial concentration of BRB was 50μg·mL^(-1),and the adsorption was more in line with the langmuir model.The above experimental results showed that magnetic carbon nanotubes had good adsorption properties to butyl rhodamine B,demonstrating magnetic carbon nanotubes could be used in the adsorption of butyl rhodamine B in the aqueous solution.
作者
王蕊
王筠
徐梦恬
闫峻
WANG Rui;WANG Jun;XU Mengtian;YAN Jun(Beijing Research Institute of Uranium Geolocy,Beijing 100029,China;Science and Technology on Particle Transport and Separation Laboratory,Tianjin 300180,China)
出处
《世界核地质科学》
CAS
2022年第2期357-363,共7页
World Nuclear Geoscience
关键词
磁性碳纳米管
吸附
丁基罗丹明B
染料
magnetic carbon nanotube
adsorption
butyl rhodamine B
dye
