Metal-organic frameworks (MOFs) are a new type of porous adsorbents, which has attracted widely attention in the removal of Cr(VI) from water. In the present study, iron-based MOFs (Fe-MOFs) were synthesized by solvothermal method, and then co-electrospun with polyacrylonitrile (PAN) to obtain composite electrospun nanofibrous membranes (PAN/MOFs ENFMs). Fe-MOFs could be in situ successfully immobilized in PAN nanofibers, and retain their adsorption properties. PAN/MOFs ENFMs could rapidly adsorb Cr(VI) in water, and the maximum theoretical adsorption capacities at pH 4.0 reached 127.70 mg/g. Meanwhile, part of adsorbed Cr(VI) could be reduced to less toxic Cr(III). The adsorption of Cr(VI) on both the Fe-MOFs particles and PAN/MOFs ENFMs were spontaneous processes, and their adsorption capacities were enhanced with the increase of temperature, while declined with the increase of solution pH. By contrast, PAN/MOFs ENFMs were less affected and could effectively adsorb Cr(VI) over a broader pH range. The adsorption processes were dominated by physical adsorption, meanwhile accompanied by chemical adsorption. Immobilizing MOFs in ENFMs is beneficial to solve the problems of easy aggregation and difficult recycle of powdery MOFs adsorbents, and provides a new technological option for the removal of Cr(VI) from water by the adsorption of MOFs.

金属有机骨架（MOFs）是一种新型的多孔吸附剂，在去除水中Cr（VI）方面引起了广泛关注。本研究采用溶剂热法合成铁基 MOFs (Fe-MOFs)，然后与聚丙烯腈(PAN) 共纺得到复合电纺纳米纤维膜 (PAN/MOFs ENFMs)。Fe-MOFs可以原位成功地固定在PAN纳米纤维中, 并保留其吸附性能。PAN/MOFs ENFMs可以快速吸附水中的Cr(VI)，在pH 4.0时最大理论吸附量达到127.70 mg/g。同时，部分吸附的 Cr(VI) 可以还原为毒性较小的 Cr(III)。Cr(VI)在Fe-MOFs颗粒和PAN/MOFs ENFMs上的吸附都是自发过程，它们的吸附能力随着温度的升高而增强，而随着溶液pH的升高而下降。相比之下，PAN/MOFs ENFMs 受到的影响较小，可以在更宽的 pH 范围内有效吸附 Cr(VI)。吸附过程以物理吸附为主，同时伴随化学吸附。在ENFMs中固定MOFs有利于解决粉状MOFs吸附剂易聚集、难回收的问题，为MOFs吸附去除水中Cr(VI)提供了新的技术选择。