Excessive toxic arsenic in surface water and groundwater is a prevalent worldwide problem. A novel hierarchical porous fibrous membrane (PG/MOF), incorporating Zr-based metal organic framework (MOF-808) and graphene oxide (GO), was fabricated for arsenate removal. The well-developed nanoporous fibrous skeleton allows the exposure of adsorption sites of MOF-808 for effective arsenate removal and avoids leakage. Systematic studies on adsorption isotherms, kinetics, and filtration processes determined the practical applicability of the PG/MOF. The maximum adsorption capacity obtained from the Langmuir model was over 180 mg/g. Mechanistic analysis via SEM, FTIR, and XPS revealed that coordination and π − π interaction is responsible for the superior adsorption performance. Adsorption energy and Bader charge analysis based on DFT calculations indicated that arsenate anions are spontaneously adsorbed near the benzene ring of MOF-808 on PG/MOF. This study identified a promising method for fabricating hierarchical porous MOF-based nanofibers and provides insight into the mechanisms of arsenate adsorption.

地表水和地下水中过量的有毒砷是一个普遍存在的世界性问题。制备了一种新型分层多孔纤维膜 (PG/MOF)，该膜结合了 Zr 基金属有机骨架 (MOF-808) 和氧化石墨烯 (GO)，用于去除砷酸盐。发达的纳米多孔纤维骨架允许暴露 MOF-808 的吸附位点，从而有效去除砷酸盐并避免泄漏。对吸附等温线、动力学和过滤过程的系统研究确定了 PG/MOF 的实际适用性。从朗缪尔模型获得的最大吸附容量超过 180 毫克/克。通过 SEM、FTIR 和 XPS 进行的机理分析表明，配位和 π - π 相互作用是优异吸附性能的原因。基于DFT计算的吸附能和Bader电荷分析表明，砷酸根阴离子自发吸附在PG/MOF上MOF-808的苯环附近。本研究确定了一种有前景的制备分级多孔 MOF 基纳米纤维的方法，并提供了对砷酸盐吸附机制的深入了解。