Abstract
As promising catalysts for the degradation of organic pollutants,metal-organic frameworks (MOFs) often face limitations due to the particle agglomeration and challenging recovery in liquid-catalysis application,stemming from their powdery nature. Engineering macroscopic structures from pulverous MOF is thus of great importance for broadening their practical applications. In this study,three-dimensional porous MOF aerogel catalysts were successfully fabricated for degrading organic dyes by activating peroxymonosulfate (PMS). MOF/gelatin aerogel (MOF/GA) catalysts were prepared by directly integrating bimetallic FeCo-BDC with gelatin solutions,followed by freeze-drying and low-temperature calcination. The FeCo-BDC-0.15/GA/PMS system exhibited remarkable performance in degrading various organic dyes,eliminating 99.2％ of rhodamine B within a mere 5 min. Compared to the GA/PMS system,there was over a 300-fold increase in the reaction rate constant. Remarkably,high removal efficiency was maintained across varying conditions,including different solution pH,co-existing inorganic anions,and natural water matrices. Radical trapping experiments and electron paramagnetic resonance analysis revealed that the degradation involved radical (SO4-·) and non-radical routes (1O2),of which 1O2 was dominant. Furthermore,even after a continuous 400-min reaction in a fixed-bed reactor at a liquid hourly space velocity of 27 h-1,the FeCo-BDC/GA composite sustained a degradation efficiency exceeding 98.7％. This work presents highly active MOF-gelatin aerogels for dye degradation and expands the po-tential for their large-scale,continuous treatment application in organic dye wastewater management.
基金项目
Natural Science Foundation of Fujian Province(2023J05180)
President's Foundation of Minnan Normal University(KJ2021011)
万方数据