Solar photocatalytic removal of Cu(II), Ni(II), Zn(II) and Pb(II): Speciation modeling of metal–citric acid complexes
| Autor: | Kavita Kabra, Rubina Chaudhary, R.L. Sawhney |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Environmental Engineering
Photochemistry Health Toxicology and Mutagenesis Metal ions in aqueous solution Inorganic chemistry chemistry.chemical_element Zinc Catalysis Citric Acid Metal chemistry.chemical_compound Adsorption Nickel Environmental Chemistry Waste Management and Disposal Chemistry Pollution Copper Lead Models Chemical visual_art Sunlight visual_art.visual_art_medium Thermodynamics Citric acid |
| Zdroj: | Journal of Hazardous Materials. 155:424-432 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2007.11.083 |
| Popis: | 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 TiO 2 , 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. |
| Databáze: | OpenAIRE |
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