Study on the effect of EDTA on the photocatalytic reduction of mercury onto nanocrystalline titania using quartz crystal microbalance and differential pulse voltammetry
Study on the effect of EDTA on the photocatalytic reduction of mercury onto nanocrystalline titania using quartz crystal microbalance and differential pulse voltammetry
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DOI：
10.1016/j.electacta.2010.11.047
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发表时间：
2011-02
影响因子：
6.6
通讯作者：
Jian-hong Zhou;Chunyan Deng;S. Si;Yun-hai Shi;Xueliang Zhao
中科院分区：
文献类型：
--
作者：
Jian-hong Zhou;Chunyan Deng;S. Si;Yun-hai Shi;Xueliang Zhao
In-situ technique quartz crystal microbalance (QCM), differential pulse voltammetry (DPV) and cyclic voltammetry (CV) were employed to investigate the effect of disodium ethylenediamine tetraacetate (EDTA) on photocatalytic reduction of mercury onto nanocrystalline titania (TiO2). Effects of EDTA on adsorption of Hg(II) and its photocatalytic reduction process at the surface of TiO2in different pH solutions had been studied in detail. From the in-situ response to the adsorption of Hg(II) onto TiO2, the reaction rate and saturation adsorption amount were estimated about 4.71×10−6gmol−1min−1and 46.36 (mgHg(II)/gTiO2) via the model of pseudo-second-order kinetics respectively. The photocatalytic reduction of Hg at the surface of TiO2was influenced by pH and the mole ratio of Hg(II) to EDTA. When the ratio of Hg(II) to EDTA 1:1, it was most favorable for the photocatalytic reduction of mercury. In addition, the effects of HCOOH and EDTA on the reduction of Hg(II) was comparatively investigated and the mechanism on the photocatlytic reduction of mercury was illustrated. Therefore, it could be concluded that QCM, DPV and CV were effective methods for the investigation of photocatalytic reduction of complex heavy metal ions onto the surface of nanocrystalline TiO2.
