Excellence in Research: CAS: Design Principles for Enabling the Adsorption of Heavy Metal Cations and Oxoanions in Layered Double Hydroxides through Targeted Functionalization

在这个卓越的研究项目中，杰克逊州立大学化学、物理和大气科学系的穆罕默德·伊斯拉姆教授正在开发新的二维(2D)材料，这种材料表现出耐人寻味的吸附和化学交换特性。该项目的中心目标是设计、合成和功能化一种独特的杂化层状材料，具有增强的内置性能，用于快速、并发、高效地隔离与环境修复和废水处理相关的一类化学上不同的有毒金属和非金属污染物。该项目的研究活动涉及无机化学、材料和环境化学。因此，该项目将作为一个多学科平台，在STEM(科学、技术、工程和数学)领域教育学生。提高科学素养并将科学翻译给更广泛的受众也是这一研究项目的关键。这项研究有望扩大我们对层状材料设计原理的了解，使我们能够开发适用于硬、边界和软Lewis酸性重金属阳离子和含氧阴离子的新型吸附剂。这些工作可以促进金属-多硫化物和金属-氧多硫化物插入杂化单相2D层双氢氧化物(LDHs)的化学，并可以在它们不同的化学实体之间建立关联，以及它们与无机阳离子和阴离子物种的协同作用。本项目将调查一些因素对其吸附行为的影响。这些因素包括金属硫化物的比例、多硫化物的价态、交换到层间金属-多硫化物阴离子中的阳离子、单个阴离子部分中化学上不同的氧化物和硫化物、具有离子可交换阳离子的2D层状主体LDH、不同程度的主客体相互作用以及可变的层间距离。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

In this Excellence in Research project, Professor Muhammad Islam of the Department of Chemistry, Physics and Atmospheric sciences at Jackson State University is developing new classes of two-dimensional (2D) material that exhibit intriguing adsorption and chemical exchange properties. The central goals of this project are to design, synthesize and functionalize a unique class of hybrid layered materials with an enhanced built-in property for the rapid, concurrent, highly efficient sequestration of a chemically distinct class of toxic metallic and non-metallic pollutants relevant to environmental remediation and wastewater treatment. The research activities of this project lie at the nexus of inorganic, materials and environmental chemistry. Thus, this project will serve as a multidisciplinary platform to educate the students in the STEM (science, technology, engineering and mathematics) fields. Developing scientific literacy and translation of science to a broader audience are also key to this research project. This research is expected to expand our knowledge of layered materials design principles to enable the development of new classes of adsorbents for hard, borderline, and soft Lewis acidic heavy metal cations, and oxyanions. The proposed efforts could advance the chemistry of metal-polysulfides and metal-oxypolysulfides intercalated into hybrid single-phase 2D layer double hydroxides (LDHs) and could develop a correlation among their distinct chemical entities and their synergistic interactions with inorganic cationic and anionic species. This project will investigate the impacts of a number of factors on their adsorption behaviors. Such factors include metal sulfide ratios, valence states of the polysulfides, cation exchanged into the interlayered metal-polysulfide anions, chemically distinct oxides and sulfides in a single anionic moiety, 2D layered host LDHs with ion-exchangeable cations, different degrees of host-guest interactions, and variable inter-layered distances.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.