Synthesis Of Mesoporous Iron - Based Composite And Supported Metal Oxide And Heterogeneous Fenton Catalytic Degradation Of Dye Wastewater

As a new kind of nano-material, mesoporous materials exhibit the high surface area and moderate pore volume, uniform and tunable mesoporous structure. Based on these properties, particular attention had been made to the refractory pollutants of water by synthetic dyes in the textile industry with mesoporous materials. In this paper, we were committed to synthesize and modify the mesopurous carbon and silicon to enhance the catalytic activity and reusability by the degradation of methylene blue (MB) in heterogeneous Fenton system. The surface of carbon support made from phenolic resin was less hydrophilic, so the oxygen-containing groups were introduced in the carbon matrix by the hydrogen peroxide modification processes, which could improve the hydrophilic and acid properties. Such process was benefit to the contact of catalyst and organic dye molecules, and then increased the catalysis activity in Fenton reaction. At the same time, we loaded Fe-Cu bimetallic oxide in the porous silicon matrix, the catalyst synthesized showed highly catalytic activity and elimination rate of methylene blue in the heterogeneous Fenton reaction. The main contents of this paper are listed as follows:1. Using amphiphilic triblock copolymer F127 as a template, phenolic resol as carbon source, metal nitrates as metal sources, ordered mesoporous carbon with uniform metal-containing nanoparticles (Fe/meso-C) was synthesized by chelate-assisted multicomponent coassembly method and modified by H2O2 (labeled as H-Fe/meso-C). With the characterization such as XRD, TEM, SEM, TG and N2 sorption-desorption isotherms, the catalyst H-Fe/meso-C remained the uniform three-dimentional cubic Ia3d me so structure, high surface area and pore volume. After treatment with H2O2, the catalyst H-Fe/meso-C showed enhanced surface, pore volume and pore size, which might be due to the etching of carbon surface with H2O2. Some new mesopores can be generated or the adjacent mesopores become united during the etching processes, which made the heterogeneous Fenton catalysis reaction more efficiently.2. The mesoporous silicon supported Fe-Cu bimetallic catalyst (Fe-Cu@MPSi) was synthesized by low-temperature magnesium reduction and hard-template method. With the characterization such as XRD, TEM, SEM and N2 sorption-desorption isotherms, such catalyst not only maintain the uniform three-dimensional cubic Ia3d mesostructure, some new disordered mesopores could be generated to make the larger surface area and pore volume than SBA-15 sample. As a semiconductor, monatomic silicon had greater ability to transfer electron during the reaction processes than silica and other inorganic materials, which made it easily to transfer electrons in the silicon matrix and the metal ions could change valences freely. At the same time, the iron and copper metals in the catalyst could offer more active sites and the synergetic effect of two metal ions made the ions change valences quickly, which could accelerate the degradation rate in the heterogeneous Fenton catalysis reaction.