PEI改性多孔二氧化硅微球的制备及其对巴豆醛的吸附性能研究  

Preparation of Polyethyleneimine-modified Porous Silica Microsphere and Its Adsorption Performance for Crotonic Aldehyde

作　　者：谢兰英 汤龙 罗玮 郭君康 尹双凤[2] XIE Lan-ying;TANG Long;LUO Wei;GUO Jun-kang;YIN Shuang-feng(Technology Center,China Tobacco Hunan Industrial Co.,Ltd.,Changsha 410019,China;College of Chemistry and Chemical Engineering,HunanUniversity,Changsha 410082,China)

机构地区：[1]湖南中烟工业有限责任公司技术中心,中国长沙410019 [2]湖南大学化学化工学院,中国长沙410082

出　　处：《湖南师范大学自然科学学报》2023年第1期48-56,共9页Journal of Natural Science of Hunan Normal University

基　　金：湖南省自然科学基金资助项目(2020JJ5036);烟草行业卷烟功能材料重点实验室(湖南中烟工业有限责任公司)开放基金资助课题(H201991380597)。

摘　　要：以十二胺(DA)和聚乙烯吡咯烷酮(PVP)为模板剂,制备具有不同孔径的多孔二氧化硅微球,然后采用聚乙烯亚胺(PEI)对微球进行改性制得复合材料,探究其对卷烟主流烟气中巴豆醛的选择性吸附性能。通过扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、紫外-可见吸收光谱(UV-Vis)、热失重(TG)和低温氮气吸脱附等方法探究材料的组成、形貌和结构,并结合动态重量法(DVS)、吸附动力学模拟以及卷烟抽吸实验对其吸附性能进行研究。研究结果表明,合成的二氧化硅微球具有均匀的介孔结构,且随着PVP分子量的增大,微球孔径逐渐增大;经PEI改性后,二氧化硅载体材料表面及部分孔道被PEI所覆盖,导致复合材料的孔容、比表面积以及孔径均有所减小;巴豆醛在复合材料上的吸附符合拟二级动力学,且受颗粒内扩散作用影响。与对照品相比,复合材料对主流烟气中的巴豆醛的选择性去除率达到18.5%。Porous silica microspheres(PSMs) with different pore diameters were prepared by using dodecylamine(DA) and polyvinylpyrrolidone(PVP) as co-templates. After the subsequent modification by polyethyleneimine(PEI), the PSMs were employed to selectively absorb the crotonic aldehyde in the cigarette mainstream smoke. The composition, morphology and structure of the composite materials were investigated by SEM, TEM, XRD, UV-Vis, TG and low temperature nitrogen adsorption-desorption techniques. Additionally, the adsorption performance for crotonic aldehyde was analyzed by the DVS method, adsorption kinetics simulation and cigarette smoking experiment. The results indicate that the preparted PSMs have a uniform mesoporous structure, and the pore diameter increases with the increased molecular weights of PVP. After modification, the surface and partial pore of the support were covered by PEI, resulting in the decreased pore volume, specific surface area and pore diameter. The adsorption of crotonic aldehyde on the composite materials can be well described by the pseudo-second-order kinetic model, and is obviously affected by the intraparticle diffusion. Compared with the control group, the composite materials can selectively absorb 18.5% of crotonic aldehyde in the cigarette mainstream smoke.

关 键 词：吸附 多孔二氧化硅微球 聚乙烯亚胺 巴豆醛 

分 类 号：TS411[农业科学—烟草工业] TS426[理学—物理化学] O647.33[理学—化学]