Conductive Modification Of Macroporous Adsorption Resin And Its Application In Microbial Fuel Cell

Phenolic wastewater is highly toxic and difficult to degrade,and must go through strict technical control before it can be safely discharged,otherwise it will cause immeasurable damage to the environment.Therefore,how to remove phenolic compounds in industrial wastewater has become one of the key research problems in the contemporary environmental field.In this project,Macroporous Adsorptive Resin(MAR)was modified to produce two modified resins,namely Graphene Oxide-Macroporous Adsorption Resin(GO-MAR)and Polyaniline-Macroporous Adsorption Resin,PANI/MAR).The modified resins were used as multifunctional biological carriers in anaerobic fluidized bed microbial fuel cells(AFB-MFC)to treat simulated phenolic wastewater(PW).The results showed that the power generation performance and sewage treatment capacity of the AFB-MFC were significantly improved.Through the simulation study of molecular dynamics,a variety of biological carriers were explored in depth,including their intermolecular forces,stability,solubility and adsorption of pollutants.The diffusion and adsorption mechanism of organic molecules in the resin in wastewater were revealed by combining experiments and simulations,and the main research contents of this paper are as follows:Firstly,graphene oxide modified resin(GO-MAR)and polyaniline-modified resin(PANI/MAR)were prepared,respectively.GO-MAR was prepared under the reduction of glucose and ammonia using macroporous adsorption resin(MAR)as the matrix and graphene oxide as the modified material.The MAR was modified by in-situ redox polymerization of conductive polyaniline,and polyaniline-modified resin(PANI/MAR)was prepared.Various analytical test methods such as scanning electron microscopy(SEM),Fourier transform infrared spectroscopy,laser Raman spectroscopy and BET were used to characterize and test the properties of modified resins.Different modified resins were used in AFB-MFC to treat phenolic wastewater,and the power generation performance and sewage treatment capacity of the device were investigated.It is found that in the graphene oxide modified resin system,the performance of using GO-3-MAR as a battery is excellent,and the maximum output voltage and the maximum power density are 405.8 m V and 242.67 m W/m~2,respectively.The maximum voltage and the maximum power density are increased by 84.04%and 7.65 times,respectively,compared with the battery system with unmodified resin as the carriers.Among the polyaniline-modified resin systems,the battery with MAR/PANI-2 as the carrier has the best power production performance.Compared to blank operation,the maximum voltage is increased by 165.72%to 489.2±0.01 m V,and the maximum power density is increased by 414.81%.The COD removal of AFB-MFC filled with MAR/PANI-2 was88.92%±1.5%.Secondly,the molecular dynamics module(Forceit)in MS software is used to simulate the cohesive energy density and solubility parameters of PANI/MAR,and the relationship between the magnitude of the intermolecular force and the conductivity is explored.The results showed that the solubility parameters of MAR/PANIs with three different mass ratios were positively correlated with the cohesion density.The interaction force within the MAR/PANIs system is MAR/PANI-2>MAR/PANI-3>MAR/PANI-1.Taking GO-MAR as the research object,the root mean square shift is used to explain the kinetic motion law of atoms and molecules at the interface of the composite and the interaction force between molecules.When the motion trajectory of-COOH,-OH,C atoms and H atoms are consistent,the relative motion degree is minimum,and the interface binding force of the composite material is strongest.Thirdly,the adsorption mechanism of modified resin in AFB-MFC on main organic compounds in PW was studied by combining experiments and simulations.Using the Sorption module of Materials Studio(MS),the adsorption relationship between organic matter and PANI/MAR in phenolic wastewater was studied.The average adsorption heat of m-cresol,phenol and benzene was 54.4095,43.8744 and 32.0416 k J/mol,respectively,indicating that MAR/PANI-2 had the strongest adsorption effect on m-cresol,followed by phenol and benzene.The diffusion coefficient of m-cresol in the resin is 0.0386(?)~2/ps,which is the largest among the three organic compounds,which can transfer to the the resin surface faster and improve the enrichment rate of the resin surface,which is consistent with the calculated results of adsorption heat.