Preparation And Properties Of Electrochemical Filler Burdening TiO₂, SnO₂

Since the eighteen countries more and more attention is attracted by increasinglyobvious environmental problems. Electro-catalytic oxidation method is an effectiveorganic wastewater treatment technology, and environmental workers pay moreattention to it in recent years. Because of the key role in the process of fillingelectro-catalytic oxidation, preparation of fillers of high performance and long lifefillers has become a key issue of electrochemical water treatment technology.Manufacture activated carbon filler burdening TiO2and SnO2with the method ofsol-gel based on previous work. And analysis them with XRD, XPS, TEM,polarization curves, cyclic voltammetry, electrochemical impedance spectroscopy andother means. The results showed that: activated carbon with TiO2is brookite andactivated carbon with SnO2is rutile. Their crystallinity is80.4%and74.3%respectively，and the particle size is16.8nm and12nm. Ti2pis mainly Ti4+valencestate. Atomic ratio of Ti,O atoms is1:1.93; Sn3din the sample is mainly Sn4+, atomicratio of Sn and O is1.86. The reasons for this phenomenon may be due to thepresence of oxygen vacancies. Three kinds of filler in the degradation rate is not verydifferent, but the degradation time of TiO2filler and degradation efficiency aresuperior activated carbon with SnO2, and degradation efficiency of activated carbonwith nothing is the lowest. By analyzing the reaction kinetics of the three filler we canknow the electrochemical reaction are participating in the three packing stage reactioncontrol, late into the diffusion-controlled reaction stage, the current utilizationdecreased. Polarization curves in three fillers show that oxygen evolution potentialand limiting current density of TiO2filler is higher than the other two fillers,indicating the rate of degradation of organic matter and the highest efficiency. Byanalyzing EIS of three filler we can know that data point of TiO2and SnO2packingfiller is indistinguishable, but different from activated carbon with nothing.It showsthat TiO2and SnO2can improve conductivity of activated carbon, so that effectivelyprevent short-circuit current and increase the degradation efficiency.