Kabra Kavita, Chaudhary Rubina, Sawhney R L
School of Energy and Environmental Studies, Devi Ahilya University, Takshashila Campus, Khandwa Road, Indore 17, MP, India.
J Hazard Mater. 2008 Jul 15;155(3):424-32. doi: 10.1016/j.jhazmat.2007.11.083. Epub 2007 Nov 29.
The present study is targeted on solar photocatalytic removal of metal ions from wastewater. Photoreductive deposition and dark adsorption of metal ions Cu(II), Ni(II), Pb(II) and Zn(II), using solar energy irradiated TiO2, has been investigated. Citric acid has been used as a hole scavenger. Modeling of metal species has been performed and speciation is used as a tool for discussing the photodeposition trends. Ninety-seven percent reductive deposition was obtained for copper. The deposition values of other metals were significantly low [nickel (36.4%), zinc (22.2%) and lead (41.4%)], indicating that the photocatalytic treatment process, using solar energy, was more suitable for wastewater containing Cu(II) ions. In absence of citric acid, the decreasing order deposition was Cu(II)>Ni(II)>Pb(II)>Zn(II), which proves the theoretical thermodynamic predictions about the metals.
本研究旨在利用太阳能光催化去除废水中的金属离子。研究了利用太阳能照射的二氧化钛对金属离子Cu(II)、Ni(II)、Pb(II)和Zn(II)的光还原沉积及暗吸附情况。柠檬酸被用作空穴清除剂。对金属物种进行了建模，并将物种形成作为讨论光沉积趋势的工具。铜的还原沉积率达到了97%。其他金属的沉积值显著较低[镍(36.4%)、锌(22.2%)和铅(41.4%)]，这表明利用太阳能的光催化处理工艺更适用于含Cu(II)离子的废水。在没有柠檬酸的情况下，沉积顺序为Cu(II)>Ni(II)>Pb(II)>Zn(II)，这证实了关于这些金属的理论热力学预测。
