Doctor of Philosophy
Porous materials are of expanding scientific interest because of their ability to interact with atoms, ions, and molecules at their large interior pore surfaces at nanoscale throughout the bulk of the material. In this dissertation, a series of microporous materials and a mesoporous material are discussed.In the first part, the synthesis of new anionic porous organic frameworks with phosphate groups (PA-POFs) through Yamamoto coupling reactions is presented. These materials have high adsorption capacity and exceptional adsorption kinetics towards bisphenol A (BPA) in water, a wide-spread organic pollutant and a known endocrine disruptor. The maximum adsorption capacity of BPA at equilibrium is found as high as 3,366 mg g-1 by Langmuir adsorption model, which is more than ten times greater than peer materials. The polymer also rapidly removes various other organic micropollutants with more than 90% removal efficiencies. In addition, the PA-POF material can be regenerated at least five times by mild washing using methanol without significant loss in removal efficiency. The CO2 adsorption capacity of these materials were also studied. The carbon dioxide uptake capacities of the PA-POFs reach up to 103 cc g-1 (1.0 bar and 273 K), making them promising candidates for CO2 capture.In the second part, the crystallization of an amorphous Al-SBA-15 material under a strong flux of Li+ with the retention of mesostructure is discussed. The crystalline lithium aluminosilicate (LAS) material was fully characterized by XRD, solid state NMR, TEM, SAXS, ICP-OES and EDS. The acidity and ion-exchange properties are studied.
Liu, Yiqun, "From anionic porous organic frameworks with phosphate functional groups to a mesoporous aluminosilica material with crystalline pore walls" (2018). Theses and Dissertations. 4303.
Available for download on Wednesday, August 14, 2019