Ion exchange without Chemical Regeneration: Raman Spectroscopy Studies of Hexacyanoferrate Derivatized Electrodes

提案编号：9729046提案类型：环境保护局-国家科学基金会联合倡议，1997年首席研究员：丹尼尔·T·施瓦茨隶属关系：华盛顿大学这笔赠款是通过化学和运输系统司界面、运输和分离计划中的分离和净化计划子要素授予的。首席研究员是华盛顿大学的丹尼尔·T·施瓦茨。本研究旨在开发一种新型的环境友好型离子交换剂，该离子交换剂使用六氰基铁酸盐(HCF)衍生电极。在这些材料中，铁的氧化态是在铁和亚铁之间的电势调制。通过这样调节电荷密度，电极表现为离子交换材料，允许其他阳离子加载到电极中或洗脱到溶液中。PI试图研究各种离子的这种行为，以确定交换效率和负载能力。基础研究包括使用原位成像、拉曼光谱和光电化学来表征离子交换过程。这项研究将对开发对环境无害的离子交换过程具有技术意义。使用的材料是无害的，很容易通过电位调节而不是传统离子交换树脂再生的化学方法进行再生。由于离子交换工艺在食品、制药、核和化工等行业中普遍存在，因此环境友好型离子交换工艺的发展将对这些行业的工艺运行产生重大影响。

Abstract Proposal No: 9729046 Proposal Type: EPA-NSF Joint Initiative, 1997 Principal Investigator: Daniel T. Schwartz Affiliation: University of Washington This grant is awarded through the Separations and Purification Program sub-element of the Interfacial, Transport and Separations Program of the Chemical and Transport Systems Division. The principal investigator is Daniel T. Schwartz at the University of Washington. The research is directed towards the development of a new class of environmentally benign ion exchangers using metal hexacyanoferrate (HCF) derivatized electrodes. In these materials, the oxidation state of iron is potential modulated between the ferric and ferrous state. By thus modulating the charge density, the electrode behaves as an ion exchange material allowing other cations to load into the electrode or elute out into solution. The PI seeks to study this behavior for a variety of ions to determine exchange efficiency and loading capacities. Fundamental studies include using in-situ imaging Raman spectroscopy and photoelectrochemistry to characterize the ion-exchange process. The research will have technological implications in the development of environmentally benign ion exchange processes. The materials used are innocuous, and easily regenerable through potential modulation rather than the chemical methods used to regenerate conventional ion-exchange resins. Since ion exchange processes are ubiquitous in the food, pharmaceutical, nuclear and chemical industries, the development of environmentally benign ion exchange processes will have a major impact on process operation in these industries.