高比表面积掺氮多孔炭的制备及其对金霉素的吸附性能研究

Preparation of N-doped porous carbon with high specific surface area and its adsorption performance for chlortetracycline

以煤沥青为碳源,三聚氰胺为氮源,MgO模板耦合KOH活化一步法热解制备具有高比表面积的掺氮多孔炭MCC_(x),其中x代表不同的氮源添加含量。采用比表面积及孔径分布(BET)、扫描电子显微镜(SEM)、傅立叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)等表征方法对MCC_(x)进行了表征分析,并考察了MCC_(x)对金霉素的吸附性能。结果表明,当煤沥青与三聚氰胺的质量比为0.5时,制得的MCC_(0.5)表面富含大量孔道,且伴随堆积褶皱片层,其微孔比表面积可达到2042 m^(2)·g^(-1)。傅立叶变换红外光谱图表明MCC_(x)出现了芳香族化合物的C=N键的伸缩振动。XPS分析结果表明三聚氰胺的添加成功为材料引入氮元素,MCC_(0.5)吡啶N含量最高。Langmuir吸附等温线模型能很好的描述MCC_(0.5)对金霉素的吸附过程,最大理论吸附量达到1056 mg·g^(-1)。

Coal pitch and melamine were taken as carbo source and nitrogen source,respectively,the nitrogendoped porous carbon(MCC_(x)) with high specific surface area was prepared by one-step pyrolysis method with MgO template coupled with KOH activation.The MCC_(x) was characterized by BET、SEM、FTIR and XPS,and its adsorption capacity for chlortetracycline(CTC) was investigated.The results showed that when the mass ratio of coal bitumen to melamine was 0.5,the obtained MCC_(0.5) contained a large number of pores with accumulated fold laminates.The micropores specific surface area of MCC_(0.5) could reach 2 042 m^(2)·g^(-1).The FTIR spectra of MCC_(x) showed that the stretching vibration of the C=N of aromatic compounds appeared.XPS results showed that N element was successfully introduced in MCC_(x) with the addition of melamine,and MCC_(0.5) had the highest pyridine N content.Langmuir adsorption isotherm model could well describe the adsorption process of CTC on MCC_(0.5),with the maximum theoretical adsorption capacity of 1 056 mg·g^(-1).