羧基功能化SBA-15介孔材料的制备及其吸附性能研究  

Preparation and Adsorption Properties of Carboxyl Functionalized SBA-15 Mesoporous Materials

作　　者：李友凤 吕国岭 潘淇 肖烨 伍远辉 LI You-feng;LYU Guo-ling;PAN Qi;XIAO Ye;WU Yuang-hui(School of Chemistry and Chemical Engineering,Zunyi Normal College,Zunyi Guizhou 563000,China)

机构地区：[1]遵义师范学院化学化工学院,贵州遵义563000

出　　处：《当代化工》2023年第9期2062-2067,共6页Contemporary Chemical Industry

基　　金：贵州省科技厅基金项目(黔教合KY字[2019]114);服务地方产业革命项目[尊师CXY2021[01]];遵义市科技局与遵义师范学院联合科技研发资金项目(遵市科合HZ字268号);贵州省材料电化学特色重点实验室项目(黔教合KY字[2018]004)。

摘　　要：先采用模板剂合成法合成SBA-15分子筛,再以草酸作为羧基改性试剂,并采用嫁接法制备羧基改性SBA-15介孔复合材料,利用XRD、SEM、BET等方法对样品的结构、形貌及织构特性进行表征,实验研究羧基改性SBA-15介孔复合材料吸附性能及其稳定性。结果表明:羧基改性的SBA-15的衍射峰增强,即介孔有序结构有所提高,其结构主要为不规则椭球形;羧基改性后产品的吸附性能高于改性前的SBA-15的。随着pH的增大,去除率和吸附量先增大后减小,当pH值为8.0时,Cu^(2+)吸附率最大为92.82%、43.29 mg·g^(-1);当吸附时间100 min时,达到吸附-脱附平衡;该材料的吸附稳定性好,吸附过程符合二级动力学模型。SBA-15 mesoporous material was synthesized by template synthesis method.Then carboxyl modified SBA-15 mesoporous molecular sieve was prepared by grafting method using oxalic acid as carboxyl modifying agent.The structure,morphology and texture characteristics of the samples were characterized by XRD,SEM and BET.The adsorption properties and stability of carboxyl modified SBA-15 mesoporous composites were studied.The results showed that the diffraction peak of carboxyl modified SBA-15 was enhanced,and its structure was mainly irregular ellipsoid.The adsorption performance of the carboxyl modified product was higher than that of SBA-15 before modification.With the increase of pH,the removal rate and adsorption amount increased first and then decreased.The maximum adsorption rate of Cu^(2+)was 92.82%and 43.29 mg·g^(-1),when the pH value was 8.0.When the adsorption time was 100 min,the adsorption desorption equilibrium was reached.The sample exhibited good adsorption stability and the adsorption process conformed to the second-order kinetic model.

关 键 词：SBA-15 羧基 改性 介孔材料 吸附性能 

分 类 号：TQ09.11[化学工程]