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

摘要：具有多功能桥接和表面基团的周期性介孔有机硅用于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特别的关注。先前的NSF项目侧重于用多功能配体将有序介孔二氧化硅（OMSs）表面功能化合成高容量重金属离子吸附剂。目前项目的主要目标是开发所谓的周期性介孔有机硅（PMOs），其包含多功能桥接基团，对重金属离子（如汞和铅）具有高亲和力和选择性。此外，这些PMOs的介孔表面可以用其他多功能配体修饰，以提高其选择性和吸附能力。更具体地说，我们建议通过用三[3-（三甲氧基硅基）丙基]异氰脲酸酯和双[3-（三乙基氧基硅基）丙基]四硫化物等多功能桥接基团设计结构，并在其表面用（3-巯基丙基）三甲氧基硅烷和二苯硫代硫脲配体修饰，来合成新的pmo基吸附剂，以去除汞离子和其他重金属离子。将对这些吸附剂的性能进行严格评估，以去除水溶液中的汞和铅离子，并确定表面功能和多孔结构的最佳组合。此外，还将探讨pmo基吸附剂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.