纳米TiO2三维电极光电协同降解苯酚溶液研究

Study on Synergetic-Photoelectrocatalytic Degradation of Phenol by Nano-TiO2 Three-dimensional Electrode

在0.25%的氢氟酸溶液中,采用阳极氧化法在纯钛板表面制备出高度均匀、排列整齐的二氧化钛纳米管。将含有二氧化钛纳米管的钛板、石墨电极和活性炭颗粒组成三维电极,并应用在降解苯酚的电催化和光电协同催化反应中。对光催化、电催化和光电协同催化降解苯酚实验进行了对比,并考察了在光电协同体系下,外加电压、降解时间、电解质浓度和粒子电极添加量等对溶液中苯酚降解率的影响。结果表明,制备出的锐钛矿型纳米二氧化钛管管径范围为80~100nm。在苯酚降解实验中,紫外光协同三维电极的光电催化表现出较好的协同效应。同时,在紫外光强度为28mW/cm^2的前提条件下,当Na2SO4电解质浓度为0.15mol/L、活性炭粒子电极添加量8g、外加电压16V、降解时间3h时,光电协同体系下的苯酚降解率最高可达93.83%。

A high uniform and well-arranged titanium dioxide nanotubes based on pure titanium surface were prepared in 0-25%hydrofluoric acid solution using anodic oxidation method.A titanium plate containing titanium dioxide nanotubes,agraphite electrode and activated carbon particles are combined into a three-dimensional electrode and used in electrocatalytic and photoelecrto-catalytic synergistic catalytic reactions for degrading phenol.The experiments of photocatalytic,electrocatalytic,and photoelectrocatalytic degradation of phenol were compared.The effects of applied voltage,degradation time,electrolyte concentration,and particle electrode addition on the degradation rate of phenol in solution were investigated.The results show that the prepared anatase nano titanium dioxide tube has a diameter ranging from 80 to 100 nm.In the phenol degradation experiment,the phtotcatalytic of the ultraviolet light synergistic three-dimensional electrode showed a good synergistic effect.At the same time,under the premise of ultraviolet light intensity of 28 mW/cm^2,when the concentration of Na2 SO4 electrolyte is0.15 mol/L,the amount of activated carbon particle electrode is 8 g,the applied voltage is 16 V,and the degradation time is 3 h,the degradation rate of phenol is up to 93.83%.