B掺杂介孔C/SiO_(2)复合材料的自组装法合成及其CO_(2)吸附性能  

The Self-assembly Synthesis and CO_(2)Adsorption Property of Boron-doped Mesoporous C/SiO_(2)Composites

作　　者：金效齐 葛金龙 张丽园 熊明文 吴中 孟晓林 JIN Xiaoqi;GE Jinlong;ZHANG Liyuan;XIONG Mingwen;WU Zhong;MENG Xiaolin(School of Materials and Chemical Engineering/Anhui Provincial Engineering Laboratory of Silicon-based Materials,Bengbu University,Bengbu 233000,China)

机构地区：[1]蚌埠学院材料与化学工程学院/安徽省硅基新材料工程实验室,蚌埠233000

出　　处：《华南师范大学学报（自然科学版）》2022年第4期48-55,共8页Journal of South China Normal University(Natural Science Edition)

基　　金：安徽省重点研发项目(202004a05020017);安徽省自然科学重大项目(KJ2019ZD62,KJ2021ZD0140);蚌埠学院高水平培养项目(2021pyxm09);蚌埠学院博士科研启动基金项目(BBXY2018KYQD22)。

摘　　要：采用溶胶-凝胶结合协同自组装法,以三嵌段共聚物F127为模板剂,以正硅酸乙酯为硅源,以酚醛树脂为碳源,改变硼酸三异丙酯硼源的投料量,制备了一系列具有丰富介孔结构的新型B掺杂介孔C/SiO_(2)复合材料(BC/SiO_(2)),研究B的掺杂量对BC/SiO_(2)复合材料CO_(2)吸附性能的影响,采用3种等温吸附模型(Langmuir、Freundlich和DSL)分别对CO_(2)等温吸附曲线进行拟合分析。结果表明:BC/SiO_(2)复合材料呈球形,且具有较高的比表面积和均一的孔径分布;在BC/SiO_(2)复合材料中,大部分B原子已被均匀掺入到碳骨架中,从而产生极性位点;BC/SiO_(2)复合材料对CO_(2)的吸附能力不仅与材料比表面积大小有关,同时也与B掺杂所产生极性位点数量相关;B掺杂的BC/SiO_(2)复合材料对CO_(2)分子存在2种不同强弱的吸附位点,CO_(2)吸附等温线符合DSL等温吸附模型。A serias of novel mesoporous carbon/silica composites(BC/SiO_(2))with abundant mesoporous structure were successfully prepared with the sol-gel self-assembly method,wherein triblock copolymer F127 was used as a template,tetraethoxysilane was used as an inorganic silicon precursor,and phenolic resin and triisopropyl borate were selected as C-and B-containing precursors.Meanwhile,the effect of the content of boron doped on the CO_(2)capture capacity of BC/SiO_(2)composites was investigated and the adsorption isotherms of CO_(2)were determined.The results were fitted and analyzed using three kinds of adsorption isotherms models(Langmuir,Freundlich and DSL models).These results demonstrated that the BC/SiO_(2)composites exhibited a spherical shape and had a high specific surface area and uniform pore distribution and a large amount of boron atoms was uniformly doped in the carbon framework of BC/SiO_(2)composite,which introduced the polar sites.The capability of capturing CO_(2)was not only related to the specific surface area of the composite material but also to the number of polar sites generated by doped boron.It was found that the adsorption CO_(2)molecules on BC/SiO_(2)composites presented two adsorption sites with different degrees and adsorption isotherms of CO_(2)were highly consistent with the DSL model.

关 键 词：碳 二氧化硅 B掺杂 二氧化碳吸附 吸附等温线 

分 类 号：O643.42[理学—物理化学]