氨基改性自助装有序多孔二氧化硅的制备及其吸附性能初探  

Preparation and adsorption ability of tri-amino-modified assembled periodic mesoporous silicates particles

作　　者：张萌[1] 秦睿[1] 王力[1] 李荣华[1,2] 杨亚提[3] 张增强[1,2] 李忠宏[4] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]西北农林科技大学农业部西北植物营养与农业环境重点实验室,陕西杨凌712100 [3]西北农林科技大学理学院,陕西杨凌712100 [4]西北农林科技大学食品科学与工程学院,陕西杨凌712100

出　　处：《西北农林科技大学学报（自然科学版）》2014年第1期211-217,共7页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家自然科学基金项目(41101288;31371813)

摘　　要：【目的】探讨不同方法制备的三氨基改性自助装有序多孔二氧化硅(3N-APMSs)的吸附性能,为促进自助装有序多孔二氧化硅在重金属吸附领域的应用提供理论依据。【方法】以二乙烯三胺基丙基三甲氧基硅烷(TPDA)为改性剂,通过共聚法和后期接枝法制备出了3N-APMSs,并采用批处理的方法探讨了其对溶液中Cu2+的吸附性能,分析了去离子水、0.01mol/L EDTA溶液和0.1mol/L HCl溶液对3N-APMSs再生的影响。【结果】红外光谱Zeta电位和透射电镜扫描分析显示,成功制备出了3N-APMSs;N2吸附-解吸技术分析表明,经过改性后3NAPMSs的比表面积、平均孔径和孔体积均明显减小。共聚法合成的3N-APMSs对溶液中Cu2+的吸附要慢于后期接枝法制备的3N-APMSs,但经过12h后二者对Cu2+的吸附率均超过99.5%。0.01mol/L EDTA溶液和0.1mol/L HCl溶液是较为合适的3N-APMSs再生剂。【结论】共聚法和后期接枝法均能制备出对Cu2+具有较好吸附能力的3N-APMSs,但共聚法有利于氨基在有序多孔二氧化硅孔隙中的自助装定向排列。3N-APMSs对Cu2+的吸附不是范德华力作用的简单物理吸附过程。[Objective] Aiming to promote the utilization of assembled periodic mesoporous silicates in heavy metal removal, adsorption ability of tri-amino-modified assembled periodic mesoporous silicates parti- cles （3N-APMSs） was investigated. [Method] 3N-APMSs were synthesized through co-condensation and post-grafting method using trimethoxysilyl propyl diethylenetriamine （TPDA） as modifier, and their ability to adsorb Cu2＋ was investigated through batch experiments. Effects of deionized water,0.01 mol/L EDTA and 0.1 mol/L HC1 on regeneration of 3N-APMSs were studied as well. [Result] FTIR analysis showed that 3N-APMSs were successfully synthesized. The modification led to the decrease of average pore size,pore volume,as well as specific surface area. 3N-APMSs prepared by co-condensation showed lower Cu2＋ adsorption rate than that prepared by post grafting method, but 3N-APMSs prepared by both methods had 〉99.5% Cu2＋ adsorption rate after 12 hours. 0.01 mol/L EDTA and 0.1 mol/L HC1 were suitable for 3N-APMSs regeneration. [Conclusion] Co-condensation method was more efficient in assembling functional groups in highly ordered dispersed condition than post-grafting method. Both methods could be used in 3N- APMSs preparation. The Cu2＋ adsorption was not a simple Van der Waals force controlled physical adsorp- tion process.

关 键 词：氨基改性 自助装有序多孔二氧化硅 共聚法 后期接枝法 Cu2+吸附 

分 类 号：X703[环境科学与工程—环境工程] X712