磁性氮掺杂石墨烯改性柿单宁复合材料对四环素的吸附行为  

Adsorption behaviors of magnetic nitrogen-doped graphene-modified persimmon tannins for tetracycline

作　　者：刘松林 王仲民[1,2] 钱熹 王童 冉兆晋 黄志民 吴晨曦[2] 李桂银 LIU Songlin;WANG Zhongmin;QIAN Xi;WANG Tong;RAN Zhaojin;HUANG Zhimin;WU Chenxi;LI Guiyin(School of Materials Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,China;Guangxi Academy of Sciences,Nanning 530007,China;College of Chemistry,Guangdong University of Petrochemical Technology,Maoming 525000,China)

机构地区：[1]桂林电子科技大学材料科学与工程学院,桂林541004 [2]广西科学院,南宁530007 [3]广东石油化工学院化工学院,茂名525000

出　　处：《复合材料学报》2023年第7期4048-4059,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(51961010);广西农业资源化学与生物技术重点实验室开放基金(2020KF07;2020KF05);广西重点研发项目(GuikeAB18281013;GuikeAB16380278)~。

摘　　要：四环素(TC)作为广谱类抗生素药物被大量应用于养殖业,因其不易自然降解的特性,造成了严重的水污染。本文以柿单宁(PT)为基体,通过氮掺杂石墨烯(NG)对其改性,并以Fe_3O_4作为磁性功能,采用水热法制得磁性复合材料Fe_3O_4-NG/PT。并针对此复合材料在吸附TC方面的应用进行研究。NG以其疏水性和比表面积大的优势,弥补了PT在吸附上的不足,Fe_3O_4解决了吸附剂难以回收的问题。通过SEM、EDS、FTIR、XPS、BET、XRD等表明其机制主要是静电作用、孔填充、氢键作用和π-π相互作用;通过XRD与磁强计表明Fe_3O_4的成功引入及其高效回收性能。并对吸附条件优化,在Fe_3O_4∶PT质量比4∶1、pH为7、180 min、投加量为0.6 g/L时,吸附效果最佳。吸附动力学符合拟二级动力学模型,化学吸附为主;吸附等温符合Freundlich模型,表明其为多层吸附。318 K时吸附的最大容量达到315.65 mg/g,吸附效率达到94.5%。Fe_3O_4-NG/PT复合材料因其较大比表面积、多孔、回收方便、大量酚羟基结构的优点,在吸附领域有一定的应用前景。Tetracycline(TC),as a broad-spectrum class of antibiotics,is used in large quantities in the farming industry and has caused serious water pollution due to its characteristics of not being easily degraded naturally.In this paper,a magnetic composite Fe3O4-NG/PT was produced by hydrothermal method,persimmon tannin(PT)was as the matrix,and modified by nitrogen-doped graphene(NG),Fe3O4 was as a magnetic filler.The application of the composite in TC adsorption was also investigated.NG with its hydrophobicity and the large specific surface area made up for the lack of persistent tannin in adsorption,and Fe3O4 solved the problem of difficult recovery of adsorbent.The mechanism was shown by SEM,chemisorption was dominant.The adsorption isotherm is consistent with the Freundlich model,indicating that it is multilayer adsorption.The maximum capacity of adsorption at 318 K reaches 315.65 mg/g,and the adsorption efficiency reaches 94.5%.The FegO4-NG/PT composites have the advantages of large specific surface area,high porosity,and phenolic hydroxyl groups,which will broaden their applicationfields.

关 键 词：柿单宁(PT) 氮掺杂石墨烯(NG) 吸附 四环素(TC) 吸附模型 

分 类 号：X703[环境科学与工程—环境工程] TB332[一般工业技术—材料科学与工程]