Porous Polymer Membranes with Uniform Catalyst Distribution for Catalytic Removal of Formaldehyde from Indoor Air

摘要提案题目：催化剂均匀分布的多孔聚合物膜催化去除室内空气中的甲醛，提案号：CTS-0625753，首席研究员：Ilona Kretzschmer，机构：纽约城市大学。摘要：该提案描述了一种生成具有均匀催化剂负载的多孔圆柱形聚合物膜的方法，该方法将导致新材料的发展，用于从室内气流中分离和分解甲醛。要测试的科学假设是，通过模板技术嵌入在膜孔中的少量催化剂对甲醛完全氧化保持催化活性。为此，聚苯乙烯（PS）颗粒用金属氧化物催化剂通过化学和/或物理气相沉积进行部分改性。模板化的聚苯乙烯颗粒(i)在聚甲基丙烯酸甲酯毛细管内组装成胶体晶体，（ii）用聚氨酯（PU）预聚体溶液渗透，（iii）固化形成催化剂/PS/PU基质。随后用甲苯去除PS组分导致多孔膜结构，每个孔中嵌入催化剂。所提出的方法是非常通用的，因为孔隙大小很容易通过模板颗粒的大小和用于渗透的预聚物的粘度来操纵。催化剂模板颗粒的使用使催化剂在膜孔中的精确分布成为可能。它提供了多种催化剂材料，例如，即使是不溶性的催化剂材料也可以均匀分布在膜内。此外，每孔催化剂的用量由沉积在模板PS颗粒上的量决定。此外，聚氨酯膜的光学透明性使光谱方法能够用于监测反应物吸附以及在紫外光照射下对使用过的膜进行翻新。预计这项工作将对膜技术产生更广泛的影响。此外，PI位于一所少数族裔服务机构，与来自代表性不足群体的学生合作。该项目将包括培训一名研究生，本科生将与PI合作，并通过CCNY已有的项目得到支持。PI已经证明她可以很好地与本科生合作，这是拟议工作的一个有价值的方面。因此，该提案的教育方面是该提案的一个优势。

Abstract Proposal Title: Porous Polymer Membranes with Uniform Catalyst Distribution for Catalytic Removal of Formaldehyde from Indoor Air, Proposal Number: CTS-0625753, Principal Investigator: Ilona Kretzschmer, Institution: City University of New York. Abstract:The proposal describes a method for the generation of porous, cylindrical polymer membranes with a uniform catalyst loading that will lead to the development of new materials for the separation and decomposition of formaldehyde from indoor air streams. The scientific hypothesis to be tested is that small amounts of catalyst embedded in the pores of the membrane by a templating technique remain catalytically active towards complete formaldehyde oxidation. For this purpose, polystyrene (PS) particles are partially modified with a metal oxide catalyst by means of electroless and/or physical vapor deposition. The templated polystyrene particles are (i) assembled as a colloidal crystal inside a polymethylmethacrylate capillary, (ii) infiltrated with a polyurethane (PU) prepolymer solution, and (iii) cured leading to the formation of a catalyst/PS/PU matrix. Subsequent removal of the PS component with toluene leads to a porous membrane structure with catalyst embedded in each pore. The proposed methodology used is extremely versatile in that the pore size is easily manipulated via the size of the templating particles and by the viscosity of the prepolymer used for infiltration. The use of catalyst-templated particles enables the accurate distribution of catalyst in the pores of the membrane. It gives access to a large variety of catalyst materials, e.g., even insoluble catalyst material can be distributed uniformly within the membrane. In addition, the amount of catalyst per pore is predetermined by the amount deposition on the template PS particles. Further, the optical transparency of the polyurethane membrane enables the usage of spectroscopic methods for the monitoring of reactant adsorption as well as for refurbishing of used membranes under ultraviolet light exposure.The broader impacts of the proposed work are expected to impact membrane technology. In addition, the PI is at a minority serving institution and works with students from underrepresented groups. The project will include the training of a graduate student and undergraduates will work with the PI and be supported through pre-existing programs at CCNY. The PI has demonstrated that she can work well with undergraduate students, which is a valuable aspect of the proposed work. The education aspects of the proposal are thus a strength of the proposal.