Periodic Mesoporous Organosilicas with Multifunctional Bridging and Surface Groups for Removal of Heavy Metal Ions

建议编号：CTS-0553014机构：肯特州立大学P.I.：Mietek Jaronic标题：具有多功能桥联和表面凹槽的周期性介孔有机硅去除重金属离子水中存在的重金属离子对人类和生态系统构成严重威胁，因此它们的去除目前是美国政府机构关注的主要问题。通过离子交换和选择性吸附去除这些离子引起了人们的特别关注。先前的NSF项目主要集中在通过多官能团的有序介孔二氧化硅(OMS)的表面功能化来合成对重金属离子的高容量吸附剂。本项目的主要目标是开发所谓的周期性介孔有机硅(PMOS)，其中包含了对汞和铅等重金属离子表现出高亲和力和选择性的多功能桥基。此外，这些PMO的中孔表面还可以修饰其他多官能团配体，以提高其选择性和吸附能力。更具体地说，我们建议通过设计具有多官能团的骨架，如三[3-(三甲氧基硅基)丙基]异氰尿酸酯和双[3-(三乙氧基硅基)丙基]四硫化物，并用(3-硫代丙基)三甲氧基硅烷和二苯硫脲配体修饰它们的表面，来合成新型的PMO基吸附剂来去除汞离子和其他重金属离子。将对这些吸附剂从水溶液中去除汞和铅离子的性能进行严格的评估，并确定表面官能度和多孔结构的最佳组合。此外，还将探索PMO基吸附剂的再生和再利用的可能性。

ABSTRACTProposal Number: CTS-0553014Institution: Kent State UniversityP.I.: Mietek JaroniecTitle: Periodic Mesoporous Organosilicas with Multifunctional Bridging and Surface Grooups for Removal of Heavy Metal IonsHeavy metal ions present in water constitute a serious threat for people and ecosystems, and consequently their removal is currently a major concern of the U.S. governmental agencies. Removal of these ions by ion exchange and selective adsorption attracts particular attention. The prior NSF project was focused on the synthesis of high capacity adsorbents for heavy metal ions by surface functionalization of ordered mesoporous silicas (OMSs) with multifunctional ligands. The main objective of the current project is to develop the so-called periodic mesoporous organosilicas (PMOs) with incorporated multifunctional bridging groups that show high affinity and selectivity towards heavy metal ions such as mercury and lead. In addition, the mesopore surface of these PMOs can be decorated with other multifunctional ligands to increase their selectivity and adsorption capacity. More specifically, we propose to synthesize new PMO-based adsorbents for removal of mercury ions and other heavy metal ions by designing their framework with multifunctional bridging groups such as tris[3-(trimethoxysilyl) propyl]isocyanurate and bis[3-(triethoxysilyl)propyl] tetrasulfide as well as decorating their surface with (3-mercaptopropyl) trimethoxysilane and diphenylthiocarbazone ligands. The performance of these adsorbents will be critically evaluated for removal of mercury and lead ions from aqueous solutions and the best combination of the surface functionality and porous structure will be established. In addition, the possibility of regeneration and reuse of the PMO-based adsorbents will be explored.