| Some chemical industries would discharge a large amount of synthetic dye wastewater,and the harmless treatment of these wastewaters was a problem that must be solved.Electrochemical oxidation technology was a relatively efficient and clean organic wastewater treatment technology.Among them,electrocatalytic membrane have been commonly applied in wastewater treatment contaminated with organic pollutants and compounds today.Finding and developing membrane materials with high activity and stability was still a challenge.In this paper,novel porous titanium carbide/titanium metal hollow fiber membranes?Ti C/Ti HFMs?and porous nickel metal hollow fiber membranes?Ni HFMs?were prepared by dry-wet spinning/sintering method,and properties of metal membranes were characterized.rhodamine B?Rh B?was chosen as the representative organic dye to research the electrocatalytic activity of these membranes.?1?The effects of sintering temperature on the structural properties of Ti C/Ti HFMs were explored through characterization such as TG,SEM,pore size distribution,electrical conductivity,mechanical strength,and penetration flux.The membrane sintered at 1100?with a pore structure of?2?m on the surface,good conductivity(2513 S cm-1),excellent mechanical strength?161Mpa?,high nitrogen permeation flux(7.6×10-7 mol/m2 s pa),and pure water infiltration flux used as an anode for anode oxidation of Rh B.The experiment found that the degradation rate of Rh B was much greater than that of titanium foil,and increasing the current density and enhancing the mass transfer could accelerate the degradation rate.Experiments included electrochemical anode corrosion and successive repetition of Rh B oxidation suggested highly stability and reusability of this materials.Finally,the mechanism of the degradation process was discussed.?2?Through SEM and pore size distribution Characterization,it was found that the prepared nickel hollow fiber membrane had good sintering condition and the surface had a microporous structure of?5?m.It was used as a gas diffusion cathode for generating hydrogen peroxide by the reduction of oxygen through two electrons.The experiment discussed the effects of oxygen flow rate,electric potential,and p H on the accumulation of hydrogen peroxide and current efficiency.It was found that under the optimal conditions for 120 min,the cumulative amount of hydrogen peroxide was 101.8 mg/L and the current efficiency was 59%.Adding ferrous salt to the system,the degradation efficiency of Rh B was enhanced and acquired almost 100%removal at 0.2m M concentration of Fe2+for 60 minutes.From free radical trapping experiments,it was confirmed that hydroxyl radical?·OH?or superoxide anions?·O2-?were considered to be active substance in the EF system.Porous metal fiber membranes showed high catalytic activity and stability in the treatment of Rh B by anode oxidation and electro-Fenton technology,and were expected to play an excellent role in more fields,such as microfiltration and separation,biochemical reactors,organic wastewater treatment,electrocatalysis and Heterogeneous catalysts,etc. |
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