Preparation Of 2D-Cu₂O/poly M-phenylenediamine Coating Melamine/grapheme/carbon Fibers Material And Its Environmental Application

Based on the consideration of synthesis Cu₂O composites with excellent adsorption capacity,using glutaraldehyde as a linker,amine graphene was grafted at the amino carbon fibers（GFs）;Alternating electrochemical polymerization of m-phenylenediamine and melamine by cyclic voltammetry（CV）was carried out to form a functional carbon fibers composite electrode（MPM/GFs）;Potentiostatic or double pulse voltammetry were respectively used to electrodeposit nano-Cu₂O at MPM/GFs.Cu₂O/poly-m-phenylenediamine doped melamine/grapheme/carbon fibers composites（Cu₂O/MPM/GFs）with different morphologies were obtained.Field emission scanning electron microscopy（FE-SEM）,X-crystal diffractometer（XRD）,Fourier infrared spectrometer（FT-IR）,X-ray photoelectron spectroscopy（XPS）,Microconfocal raman spectroscopy（Raman）and electrochemical technique（EC）were used to characterize the composition and morphology of the materials.The effects of different potential,pH and time on the morphology of Cu₂O/MPM/GFs materials were investigated.The results showed that linear polymer（PmPD/GFs）was formed after electropolymerization of m-phenylenediamine at the surface of carbon fiber,while homogeneously distributed granular polymer（MPM/GFs）was formed by electropolymerization of melamine at the surface of PmPD/GFs.By changing the reaction conditions,different morphology and dispersion state of Cu₂O were prepared.Using double pulse electrodeposition method（E₁=-0.5 V,t₁=10 s;E₂=0 V,t₂=10s）,2D nanosheet Cu₂O/MPM/GFs were prepared under the condition of pH 9.0 and 10 min.Based on the consideration of rapid separation of water-soluble iodine（I^-）,potential-aided separation and recovery method was used to discuss the adsorption/desorption mechanism of water-soluble iodine（I^-）by Cu₂O/MPM/GFs.The adsorption/desorption behavior of I^-at Cu₂O/MPM/GFs was characterized by FE-SEM,XRD,XPS,Raman,UV-vis and EC techniques.Research shows,the maximum static adsorption capacity of Cu₂O/MPM/GFs to I^-is up to 40.31 mg/g under 45℃,pH 5.0 and 12 h,which is a spontaneous endothermic process.At 0.8 V,pH 5.0 and 3 h,the maximum electri adsorption capacity of Cu₂O/MPM/GFs to I^-as high as 86.82 mg/g.After the adsorption reached equilibrium,I^-were desorbed by 90 cycles CVs and the desorption rate was more than 75%.The results show that the potential adied separation and recovery of water soluble iodine（I^-）has a higher efficiency.In addition,2,6-dichlorophenol wasterwater can be photocalatically degraded by Cu₂O/MPM/GFs under the synergistic action of UV light and bias voltage 1.2 V.Under neutral conditions,bias potential 1.2V and UV light for 1 h,the degradation rate 2,6-DCP was more than 90%.