氮掺杂多壁碳纳米管活化过硫酸盐研究  

Study on persulfate activated by nitrogen-doped multi-walled carbon nanotubes

作　　者：陈西良[1] 陈欣[2] 路长远 孙晓艳 CHEN Xiliang;CHEN Xin;LU Changyuan;SUN Xiaoyan(Yellow River Conservancy Technical Institute,Kaifeng 475004,Henan,China;College of Chemistry and Chemical Engineering,Henan University,Kaifeng 475004,Henan,China;Kaifeng Key Laboratory of Materials for Water Remediation,Kaifeng 475004,Henan,China)

机构地区：[1]黄河水利职业技术学院,河南开封475004 [2]河南大学化学化工学院,河南开封475004 [3]开封市水生态修复材料重点实验室,河南开封475004

出　　处：《化学研究》2023年第2期132-139,共8页Chemical Research

基　　金：河南省重大科技专项(221100320200);河南省科技攻关项目(202102310593);开封市科技攻关项目(2002003)。

摘　　要：以盐酸浸泡过的多壁碳纳米管(MWNT)和三聚氰胺为原料,高温煅烧制备了氮掺杂的多壁碳纳米管(N/MWNT)。采用SEM、XPS、XRD、FTIR等方法研究了材料的形貌、结构、成分和表面官能团等性质。结果表明盐酸浸泡过的MWNT以及N/MWNT均管壁光滑无破损。和MWNT相比,N/MWNT中的含氧官能团的含量显著降低,羟基与三聚氰胺反应在碳纳米管的边缘生成了吡啶N和吡咯N。通过活化过硫酸盐降解磺胺甲恶唑(SMX)研究了材料的催化性能,研究发现N/MWNT的催化性能远高于MWNT,降解反应速率常数K_(obs)提高了2.3~7.8倍;水中共存的阴离子会使活化反应受到抑制,通过EPR测试发现SO_(4)^(-)·和·OH是主要的氧化反应活性物种。Nitrogen doped multi-walled carbon nanotubes(N/MWNT)were prepared by pyrolysing the multi-walled carbon nanotubes(MWNT)that was pretreated with hydrochloric acid and melamine at high temperature.SEM,XPS,XRD and FTIR were applied to characterize the morphologies,structures,compositions and surface functional groups of the products.The results showed that MWNT treated with hydrochloric acid and the derived N/MWNT both had smooth pipe walls without damage.Compared with MWNT,the content of oxygen-containing functional groups in N/MWNT was significantly reduced.Hydroxyl reacted with melamine to form pyridine N and pyrrole N at the edge of carbon nanotubes.The catalytic performance of the material was evaluated by activating persulfate for the degradation of sulfamethoxazole(SMX).It was found that the catalytic performance of N/MWNT was much higher than that of MWNT,and the degradation rate constant K_(obs) was increased 2.3-7.8 times.Adding anions inhibited the reaction of degrading pollutants due to the competitive reaction to SMX.The EPR test found that SO_(4)^(-)·and·OH were the main active species.

关 键 词：碳纳米管 氮掺杂 过硫酸盐 活化 水处理 

分 类 号：X703.5[环境科学与工程—环境工程]