二氧化硅基单宁复合材料对甲醛的吸附性能研究  

The Adsorption Properties of Silica-based Tannin Composites for Formaldehyde

作　　者：赵爱晨 周辉 房梦迪 李磊[1] 刘玉[1] ZHAO Aichen;ZHOU Hui;FANG Mengdi;LI Lei;LIU Yu(College of Materials Science and Engineering,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《林产化学与工业》2023年第6期98-106,共9页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目(32201481)。

摘　　要：基于室内空气环境中甲醛污染的问题,以常见的林副产品单宁酸为吸附源,树枝状介孔纳米二氧化硅(DMSNs)为基体,经中间体氨基改性二氧化硅(DMSNs-NH 2)制备了二氧化硅基单宁复合材料(DMSNs-tannin),当单宁酸添加量为0.3、0.4和0.5 g时制备的复合材料分别为DMSNs-0.3、DMSNs-0.4和DMSNs-0.5;采用SEM、TEM、氮气吸附-脱附等温线、FT-IR和TG分析表征其结构,考察了不同单宁负载量对其甲醛吸附性能的影响,并进行吸附动力学探究。研究结果表明:该复合材料孔道结构丰富,热稳定性高,与DMSNs-NH 2相比,DMSNs-tannin具有更优异的甲醛吸附性能;复合材料DMSNs-0.5的单宁酸负载量最高,达23.60%,负载效率为47.33%,吸附6 h时甲醛吸附率为86.19%。DMSNs特殊的介孔结构为甲醛有效扩散提供了通道,其吸附过程更符合准二级动力学模型,说明其对甲醛的吸附主要为化学吸附,与吸附位点有关,是在复合材料表面的吸附与颗粒内扩散的复合吸附过程。Based on the issue of formaldehyde pollution in indoor air environment,silica-based tannin composite material(DMSNs-tannin)was prepared using forest by-product tannic acid as the adsorption source,dendritic mesoporous silica nanoparticles(DMSNs)as the matrix,and amino modified silica(DMSNs-NH 2)as the intermediate.When the addition amount of tannic acid was 0.3,0.4,and 0.5 g,the prepared composite materials were DMSNs-0.3,DMSNs-0.4,and DMSNs-0.5,respectively.The structure was characterized by SEM,TEM,nitrogen adsorption/desorption isotherms,FT-IR,and TG analysis.The effect of different tannin loading amounts on its formaldehyde adsorption performance was investigated,and the adsorption kinetics was explored.The research results indicated that the composite material had rich pore structure and high thermal stability.Compared with DMSNs-NH 2,DMSNs-tannin had better formaldehyde adsorption performance.The DMSNs-0.5 had the highest loading capacity of tannic acid,reaching 23.60%,with a loading efficiency of 47.33%,and a formaldehyde adsorption rate of 86.19%after 6 hours adsorption.The special mesoporous structure of DMSNs provided channels for the diffusion of formaldehyde.Their adsorption process was in accordance with the quasi second-order kinetic model,indicating that their adsorption of formaldehyde was mainly chemical adsorption,which was related to adsorption sites,demonstrating a composite adsorption process of adsorption on the surface of composite materials and diffusion within particles.

关 键 词：介孔二氧化硅 树枝状 单宁酸 甲醛 吸附 

分 类 号：TQ35[化学工程]