Study On Degradation Of Dye Wastewater By MIL-100(Fe) Based Composite

Metal organic framework(MOFs)has become a hot research topic in the field of new materials due to its large specific surface area,uniform pore size distribution and material adjustability,and has been widely concerned in the field of wastewater treatment.In order to increase the specific surface area and solve the problem of catalytic recovery,MIL-100(Fe)based carbon materials were prepared by hydrothermal method.Then,MIL-100(Fe),MIL-100(Fe)based carbon materials were compounded with PANI by in-situ chemical composite method,and MIL-100(Fe)/PANI and MIL-100(Fe)based carbon materials/PANI were prepared,and characterized by XRD,FT-IR,SEM,bet and UV-VisDrs.Using MIL-100(Fe)/PANI and MIL-100(Fe)based carbon/PANI composites as adsorbents and catalysts,Rhodamine B(RHB)as the target pollutant,the optimal reaction conditions of adsorption,Fenton like and photofenton like were investigated.The adsorption kinetics,adsorption isotherm and adsorption thermodynamics of Rhodamine B with composite materials as adsorbent were studied,and the reaction kinetics and mechanism of Rhodamine B with composite materials as catalyst were studied.The conclusion is as follows:MIL-100(Fe)was successfully prepared by hydrothermal method.MIL-100(Fe)and PANI were prepared by in-situ chemical compounding method.MIL-100(Fe)/PANI showed massive cubic structure and smooth surface.MIL-100(Fe)/PANT was successfully compounded with complete crystal morphology,and its specific surface area was smaller than MIL-100(Fe).At room temperature,the reaction time was 150 min,the reaction pH=6,and the amount of adsorbent added The adsorption of Rhodamine B by MIL-100(Fe)/PANI is more in line with the second-order kinetic model,and the adsorption isotherm is more in line with Freundlich adsorption isotherm equation.The adsorption reaction can be spontaneous,which is exothermic reaction.The removal rate of Rhodamine B Fenton with initial concentration of 10mg/1 can reach 98%.The removal rate of Rhodamine B with initial concentration of 50mg 10mg/1 can reach 98%.The removal rate of Rhodamine B with initial concentration of 50mg/1 can reach 98%The removal rate of optical Fenton is 100%,and the recycling is good.MIL-100(Fe)based carbon material was obtained by calcining MIL-100(Fe)in a tubular furnace under nitrogen atmosphere for 4 hours at 500?,and then the composite material MIL-100(Fe)based carbon material/PANI was prepared by in-situ chemical composite method with PANI.The specific surface area of MIL-100(Fe)based carbon/PANI is larger than that of MIL-100(Fe)/PANI.At room temperature,the reaction time is 100min,the reaction pH=10,the dosage of adsorbent is 30mg,the initial concentration is 10mg/L,and the equilibrium adsorption capacity is 27.62mg/g;the removal rate of Rhodamine B Fenton with the initial concentration of 10mg/L can reach 93%;the removal rate of Rhodamine B light Fenton with the initial concentration of 50mg/L can reach 100%,and the recycling is good.This study laid a foundation for the modification of MIL-100(Fe)and its application in water treatment.