豆荚状磁性碳纳米管降解雷尼替丁性能研究  

Study on the Performance of Pod-Like Magnetic Carbon Nanotubes for the Degradation of Ranitidine

作　　者：段旭 艾伟 宋海东 杜红霞[2] 张军[2] DUAN Xu;AI Wei;SONG Haidong;DU Hongxia;ZHANG Jun(CSCEC AECOM Consultants Co.,Ltd.,Lanzhou 730000,China;School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]中国市政工程西北设计研究院有限公司,甘肃兰州730000 [2]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《水处理技术》2025年第1期64-70,共7页Technology of Water Treatment

基　　金：陕西省自然科学基础研究计划面上项目(2023-JC-YB-429)。

摘　　要：本研究通过简便的一锅煅烧法制备了一种新型碳基催化剂,该催化剂为包裹Fe_(3)C颗粒的氮掺杂碳纳米管(Fe_(3)C@NCNTs)。利用多种表征手段探究了材料的晶格结构、微观形貌、元素组成和磁性能,该豆荚状磁性碳纳米管的特定结构既有利于电子转移,又能防止Fe_(3)C在溶液中溶解。将其用于活化过一硫酸盐(PMS)降解典型胃药雷尼替丁(RNT)。当煅烧温度为800℃时,Fe_(3)C@NCNTs表现出最高的催化活性。通过优化反应条件,得出在RNT初始浓度为10 mg/L,催化剂投加量为0.3 g/L,PMS浓度为0.5 mmol/L、pH=7时,Fe_(3)C@NCNTs-800/PMS体系30 min内对RNT的降解效率达到97.68%,反应速率常数达0.1271 min^(-1)。此外,循环实验表明热处理有利于重塑Fe_(3)C@NCNTs的催化活性且对其晶型无明显影响。活性氧物种淬灭和捕获实验表明·OH、·SO_(4)^(-)、·O_(2)^(-)和^(1)O_(2)共同参与了RNT的降解,提出了该反应体系可能涉及的电子转移机理。In this study,a novel carbon-based catalyst containing the nitrogen-doped carbon nanotubes(Fe_(3)C@NCNTs)blended Fe_(3)C nanoparticle was prepared by a facile one-pot calcination approach.The lattice structure,microscopic morphology,elemental composition and magnetic properties of the nanomaterial were analyzed by multiple characterization methods.The specific structure of the pod-shaped magnetic carbon nanotubes was favorable for electron transfer and prevented Fe_(3)C from dissolving in solution.The Fe_(3)C@NCNTs were used to activate peroxymonosulfate(PMS)for the degradation of the typical gastric drug ranitidine(RNT),which showed the highest catalytic performance at a calcination temperature of 800℃.The optimized reaction conditions resulted in the RNT degradation efficiency of Fe_(3)C@NCNTs-800/PMS system of 97.68%within 20 min at an initial RNT concentration of 10 mg/L,a catalyst dosage of 0.3 g/L,a PMS concentration of 0.5 mmol/L and pH=7,with a reaction rate constant of 0.1271 min-1.Moreover,the cycling experiments revealed that the heat treatment was beneficial to restore the catalytic activity of Fe_(3)C@NCNTs and had no significant effect on its crystal plane.The reactive oxygen species quenching and capturing experiments exhibited that·OH,·SO_(4)^(-),·O_(2)^(-)and^(1)O_(2)jointly participated in the degradation of RNT,proposing a possible electron transfer mechanism involved in this reaction system.In conclusion,this study provides a new perspective that adjusting the catalyst structure could effectively enhance the catalytic activity and recyclability,which has a promising application in the field of water pollution.

关 键 词：磁性纳米材料 碳纳米管 过一硫酸盐 雷尼替丁 催化 

分 类 号：X52[环境科学与工程—环境工程] O643.36[理学—物理化学]