Ramu Adam Gopal, Saruulbuyan Asraltbold, Theerthagiri Jayaraman, Choi Myong Yong, Choi Dongjin
Department of Materials Science and Engineering, Hongik University, 2639 Sejong-ro, Jochiwon-eup, Sejong-city, 30016, Republic of Korea.
Core-Facility Center for Photochemistry & Nanomaterials, Department of Chemistry (BK21 FOUR), Research Institute of Natural Sciences, Gyeongsang National University, Jinju, 52828, Republic of Korea.
Environ Res. 2023 Mar 15;221:115289. doi: 10.1016/j.envres.2023.115289. Epub 2023 Jan 11.
Arsenic (As(V))-contaminated water is a major global threat to human health and the ecosystem because of its enormous toxicity, carcinogenicity, and high distribution in water streams. Thus, As(V) removal in the environmental samples has received considerable attention. Till now, numerous metal-organic framework materials have been used for the As(V) removal from the aqueous medium, but low As(V) removal and instability of the adsorbents have severely cut off their practical applications. In this study, a ferrocene-encapsulated zeolitic imidazolate framework-67 (Fc-ZIF-67) material was synthesized for As(V) removal from an aqueous solution at neutral pH using a simple solution mixing process. The ferrocene encapsulation provides water-stable and structural defects to ZIF-67. Furthermore, the ferrocene molecule and imidazole linker can enhance As(V) adsorption via both chemisorption and physisorption. The novel Fc-ZIF-67 adsorbent exhibited superior As(V) adsorption performance with an adsorption capacity of 63.29 mg/g at neutral pH. The Langmuir and Freundlich isotherm models were also used to analyze adsorption behavior.
由于其巨大的毒性、致癌性以及在水流中的高分布性，受砷（V）污染的水对人类健康和生态系统构成了重大的全球威胁。因此，环境样品中砷（V）的去除受到了广泛关注。到目前为止，许多金属有机框架材料已被用于从水介质中去除砷（V），但砷（V）去除率低和吸附剂的不稳定性严重阻碍了它们的实际应用。在本研究中，通过简单的溶液混合过程合成了一种二茂铁封装的沸石咪唑酯骨架-67（Fc-ZIF-67）材料，用于在中性pH值下从水溶液中去除砷（V）。二茂铁的封装为ZIF-67提供了水稳定性和结构缺陷。此外，二茂铁分子和咪唑连接体可以通过化学吸附和物理吸附增强砷（V）的吸附。新型Fc-ZIF-67吸附剂在中性pH值下表现出优异的砷（V）吸附性能，吸附容量为63.29 mg/g。还使用Langmuir和Freundlich等温线模型分析吸附行为。
