13X@SiO_(2)合成及其甲苯吸附性能  

13X@SiO_(2):Synthesis and Toluene Adsorption

作　　者：马晓森 张丽晨 刘砚超 汪全华 郑家军[1] 李瑞丰[1] MA Xiaosen;ZHANG Lichen;LIU Yanchao;WANG Quanhua;ZHENG Jiajun;LI Ruifeng(State Key Laboratory of Clean and Efficient Coal Utilization,College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学化学化工学院,省部共建煤基能源清洁高效利用国家重点实验室,太原030024

出　　处：《无机材料学报》2023年第5期537-543,I0010-I0012,共10页Journal of Inorganic Materials

基　　金：国家自然科学基金(U19B2003);中国石油化工股份有限公司(121014-2)。

摘　　要：常见的吸附剂如13X等的硅铝比较低,具有较强的亲水性,但水和有机挥发份(VOCs)之间的竞争吸附,常常会影响吸附剂对VOCs实际脱除效果。本研究利用CTABr为模板剂,正硅酸乙酯为硅源,对13X进行表面修饰,制备了以13X为核,介孔硅为壳的核壳复合材料13X@SiO_(2),并以甲苯作为探针分子在穿透实验装置对改性前后沸石分别进行干/湿条件下的吸附性能测试。结果表明:在干燥条件下, 13X@SiO_(2)-2.6样品(制备中添加了2.6 mL正硅酸乙酯)相比13X原样的吸附量提升了18%左右。在30%和50%相对湿度下,13X@SiO_(2)的最优吸附容量分别提高了约53%和90%;循环再生实验表明13X@SiO_(2)-2.6样品经2次再生后仍保持初始样品90%的甲苯吸附量。In practice,adsorbents such as 13X have strong hydrophilicity due to their low Si/Al ratio,whose competitive adsorption between vapour and volatile organic compounds(VOCs)often impairs the actual removal effect of VOCs on the adsorbents.Here,13X was modified using CTABr as a templating agent and tetraethoxysilane(TEOS)as a silica source.Based on this modified 13X,a core-shell composites with 13X core and a mesoporous silica shell,named as 13X@SiO_(2),was therefore synthesized.Its adsorption performance was tested by using toluene as a probe molecule under different humidity conditions on a penetration experimental device,compared with that of the pristine 13X.The results show that the adsorption capacity of sample 13X@SiO_(2)^(-)2.6(2.6 mL TEOS added in the preparation)was about 18%higher than that of 13X original sample under dry conditions.At 30%and 50%relative humidity,the optimum adsorption capacity of 13X@SiO_(2) was increased by about 53%and 90%,respectively.In order to test the stability and reusability of the adsorbents,twice regeneration of sample 13X@SiO_(2)^(-)2.6,treated for 2 h in situ desorption at 350℃,were performed,and the result showed that the regenerated sample 13X@SiO_(2)^(-)2.6 still retained 90%of the original toluene adsorption capacity.

关 键 词：核壳结构 复合材料 疏水改性 有机物挥发性 吸附 

分 类 号：TQ174[化学工程—陶瓷工业]