Plasma Assisted Prepararion Of Fe-MOFs And Performence Study

With the rapid development of society and economy,and chemical industries such as printing and dyeing,textile,leather,papermaking,water pollution became increasingly serious and water pollution treatment had become an urgent social problem.Adsorption method was a simple,effective and low-consumption treatment method for printing and dyeing wastewater.And it was very important to find a simple,effective and rapid adsorbent.At the same time,chemical degradation method was rapid and could effectively remove pollutants in wastewater and avoid secondary pollution.The use of efficient catalysts was becoming more and more important.As a new nano-material,metal-organic framework was a kind of inorganic-organic hybrid material synthesized by self-assembly of metal ions or metal clusters with organic ligands to form coordination bonds.As a porous nano-material,it had been widely studied and applied because of its unique pore structure,active sites and controllable synthesis.Because of the diversity of its structure and function,it had excellent performance in the fields of adsorption and catalytic reaction.However,the synthesis and application of metal organic framework could still need to be explored.In this paper,plasma preparation method had been applied in the preparation of metal organic framework for the first time,and the preparation of Fe metal organic framework had been completed efficiently.The adsorption and Fenton degradation of methyl orange solution by Fe metal organic framework were studied by changing the discharge voltage,discharge time,reactant concentration and reactant ratio.Fe-MOF was synthesized by dielectric barrier discharge(DBD)low temperature plasma.In the process of plasma preparation,micro-discharge channels were formed by dielectric barrier discharge(DBD),and high temperature and high pressure were formed at the micro-discharge channels,which promote the forma tion and growth of nuclei.The XRD data of FeMOF were simulated by diamond,and the results were compared with those of XRD characterization of the samples.The results showed that the FeMOF was successfully prepared by plasma method.By SEM characterization,it was found that the material presented regular diamond shape.BET data indicated the existence of channels in the samples.The prepared Fe metal organic framework was used to adsorb methyl orange simulated wastewater.Under the conditions of 10 mg/mL of reactant concentration,18 kV of voltage,80 min of discharge time and terephthalic acid: ferric chloride hexahydrate = 1:1,the adsorption capacity of the prepared Fe metal organic framework reached 750 mg/g.At the same time,the adsorption isotherms and kinetics of Fe-organometallic framework were studied.FT-IR spectra showed that the material could effectively adsorb methyl orange.Zeta potential measurements showed that the surface of the material was positively charged and electrostatic interaction occurred with the anionic dye methyl orange.The adsorption process of methyl orange on Fe metal-organic framework was investigated by analyzing the characterization data.It was found that the pore structure and electrostatic interaction played a major role in the adsorption.Fe-MOF prepared by plasma method was used to degrade methyl orange simulated wastewater in Fenton.The Fenton performance of the Fe metal organic framework prepared under the conditions of 18 kV discharge voltage,100 min discharge time,14 mg/mL reactant concentration and terephthalic acid: ferric chloride hexahydrate = 1:5,was the best,and the degradation of methyl orange at 84% concentration could be completed quickly in 40 minutes.SEM analysis showed that the agglomeration degree of particles was different under different preparation conditions.FT-IR analysis showed that the aggregation ability of materials to methyl orange could effectively accelerate the reaction.EDS analysis showed that the content of Fe in the material was beneficial to the improvement of catalytic performance.With the increase of catalyst concentration and pH,the degradation rate of methyl orange increased significantly,and with the increase of initial concentration of methyl orange,the degradation rate of methyl orange decreased.The degradation rate increases with the increase of hydrogen peroxide concentration.However,excessive hydrogen peroxide can inhibit the reaction and reduce the reaction rate.