Solar photocatalytic removal of Cu(II), Ni(II), Zn(II) and Pb(II): speciation modeling of metal-citric acid complexes

Journal of Hazardous Materials
Kavita KabraR L Sawhney

Abstract

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.

References

Jun 15, 2007·Journal of Hazardous Materials·Sevil Veli, Bilge Alyüz
Jul 3, 2007·Journal of Hazardous Materials·Can Chen, Jianlong Wang

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Citations

Jul 26, 2011·Environmental Technology·S NavalonH Garcia
May 13, 2015·Scientific Reports·Chen LingBaoshan Xing
Jun 16, 2017·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Anca PeterLeonard Mihaly-Cozmuta
Feb 11, 2012·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Liyuan LiShourong Zheng
May 2, 2018·Environmental Science and Pollution Research International·Xiaowei ZhangDan Liu
May 10, 2020·Environmental Science and Pollution Research International·Kashaf Ul KhairShafaqat Ali
Dec 15, 2016·Chemical Reviews·Kasper Wenderich, Guido Mul
Mar 12, 2018·ACS Omega·Anthony T Montoya, Edward G Gillan

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