Photoelectrocatalytic oxidation of rose bengal in aqueous solution using a Ti/TiO2 mesh electrode
Photoelectrocatalytic oxidation of rose bengal in aqueous solution using a Ti/TiO2 mesh electrode
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DOI：
10.1021/es000939k
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发表时间：
2000-10-15
影响因子：
11.4
通讯作者：
Sun, YP
中科院分区：
文献类型：
--
作者：
Li, XZ;Liu, HL;Sun, YP
为了进一步完善光氧化技术在水和废水净化中的应用，在0.5WIH2SO4溶液中对钛网进行阳极氧化，制备了一种新型的光电极--Ti/TiO2网电极。分别用拉曼光谱和扫描电子显微镜（SEM）对Ti/TiO2电极的结构和表面形貌进行了研究。结果表明，其结构和性能受阳极氧化过程中生长速率的影响，其组成以TiOP为主。研究并比较了Ti/TiO2电极对水溶液中玫瑰红的光催化（PC）氧化和光电催化（PEC）氧化。实验结果表明，在Ti O2电极和Pt电极之间施加偏压的PEC氧化比PC氧化能显著提高RE的降解速率。结果发现，PEC氧化的最佳性能是通过施加0.6 V的电偏压实现的。PEC氧化的效率也与传统的PC氧化在TiO 2悬浮液进行了比较。PEC氧化的动力学系数k被确定为在0.3%和1%TiO 2悬浮液中的常规PC氧化之间。
To further improve the photooxidation techniques for water and wastewater purification, a new type of photoelectrode, Ti/TiO2 mesh electrode,was Successfully prepared by anodizing Ti mesh in 0.5 WI H2SO4 solution. The structural and surface morphology of the Ti/TiO2 electrode was examined by Raman spectroscopy and scanning electronic microscopy (SEM), respectively. The examination results indicated that its structure and properties were affected by its growth rate in the anodization process, and anatase TiOP was dominant in its composition. The photo catalytic (PC) oxidation a nd photo electrocatalytic (PEC) oxidation of rose Bengal (RB) in aqueous solution using the Ti/TiO2 electrode were investigated and compared. The experimental results demonstrated that the PEC oxidation by applying an electrical bias between the TV TiO2 electrode and Pt electrode could significantly enhance the degradation rate of RE compared with the PC oxidation. It was found that the best performance of PEC oxidation was achieved by applying an electrical bias of 0.6 V. The efficiency of PEC oxidation was also compared with that of conventional PC oxidation in TiO2 suspension. The kinetic coefficient k for the PEC oxidation was determined to be between that of conventional PC oxidation in 0.3% and 1% TiO2 suspensions.