The Treatment Of Organic Pollutants Using Lead Dioxide Electrode Combined With The Activated Carbon Fiber

The anodes of Ti/SnO₂-Sb/PbO₂ and Ti/PbO₂ were prepared in this paper.The structure of the prepared electrodes was characterized by X-ray diffraction?XRD?,scanning electron microscopy?SEM?.The oxygen evolution potential and accelerated service-life of the electrodes were tested using electrochemical technique.The electrochemical degradation performance of the electrodes were investigated using methylene blue?MB?as a model molecule.The effects of parameters on the electrochemical degradation were discussed in details.It was shown that the degradation of methylene blue?MB?followed pseudo-first-order kinetics on both Ti/SnO₂-Sb/PbO₂ and Ti/PbO₂.The performance of Ti/SnO₂-Sb/PbO₂ was better than that of Ti/PbO₂.The optimal experimental conditions were as follows: the applied voltage 6V;the electrolyte concentration 5.0g/L;p H 7;plate spacing 1cm.The activated carbon fiber was modified using the alkali,acid,and aniline methods.The products were characterized with XRD and FT-IR.The adsorption thermodynamics and kinetics of methylene blue were studied on the unmodified and modified carbon fiber.It was displayed that adsorption of methylene blue fits the Freundlich model and the Pseudo two kinetic model.The optimized experimental conditions were chosen using orthogonal experiments: activated carbon fiber modified with 0.1 mol/L sodium hydroxide solution,temperature 40?and adsorbent dosage 1.5g.Under the chosen conditions,the adsorption rate of methylene blue was 99.7%.The regenerative adsorption capacity of alkali modified activated carbon fiber was evaluated by high temperature regeneration method.The adsorption rate's ratio was 98.4% for the before and after regeneration.The degradation of methylene blue was also investigated using lead dioxide electrode combined the activated carbon fiber.It was shown that attaching the activated carbon fiber on the cathode was better than that on the anode.The adsorption electrocatalytic degradation of methylene blue was the best when using Ti/SnO₂-Sb/PbO₂ electrode as the anode,stainless steel attached with the activated carbon fiber as cathode.The removal rate of methylene blue was 99.8% in 2 h.