Kabra Kavita, Chaudhary Rubina, Sawhney R L
School of Energy and Environmental Studies, Devi Ahilya University, Takshashila Campus, Khandwa Road, Indore-452017, M.P., India.
J Hazard Mater. 2007 Nov 19;149(3):680-5. doi: 10.1016/j.jhazmat.2007.04.028. Epub 2007 Apr 18.
The present study is targeted on the effect of pH 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 TiO(2), has been investigated at pH values 2, 4, 7, 8 and 10. Modeling of metal species at the studied pH values has been performed and speciation is used as a tool for discussing the photodeposition. The decreasing order of metal deposition at pH 2 and 4 was found to be Pb(II)>Cu(II)>Ni(II) congruent with Zn(II). In the neutral and alkaline pH conditions (pH 7, 8 and 10) the order was Cu(II)>Zn(II)>Ni(II)>Pb(II).
本研究的目标是考察pH对太阳能光催化去除废水中金属离子的影响。利用太阳能照射二氧化钛，研究了在pH值为2、4、7、8和10时金属离子Cu(II)、Ni(II)、Pb(II)和Zn(II)的光还原沉积及暗吸附情况。对所研究pH值下的金属形态进行了建模，并将形态分析作为讨论光沉积的一种工具。发现在pH值为2和4时，金属沉积的递减顺序为Pb(II)>Cu(II)>Ni(II)≈Zn(II)。在中性和碱性pH条件下（pH值为7、8和10），顺序为Cu(II)>Zn(II)>Ni(II)>Pb(II)。
