首页|Three-dimensional porous bimetallic metal-organic framework/gelatin aerogels:A readily recyclable peroxymonosulfate activator for efficient and continuous organic dye removal
Three-dimensional porous bimetallic metal-organic framework/gelatin aerogels:A readily recyclable peroxymonosulfate activator for efficient and continuous organic dye removal
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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.
College of Chemistry,Chemical Engineering and Environment,Fujian Province Key Laboratory of Morden Analytical Science and Separation Technology,Minnan Normal University,Zhangzhou 363000,China
Fujian Provincial University Key Laboratory of Pollution Monitoring and Control,Minnan Normal University,Zhangzhou 363000,China
Natural Science Foundation of Fujian ProvincePresident's Foundation of Minnan Normal University
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