title: Solar photocatalytic removal of Cu(II), Ni(II), Zn(II) and Pb(II): speciation modeling of metal-citric acid complexes.
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.
authors.affiliation: School of Energy and Environmental Studies, Devi Ahilya University, Takshashila Campus, Khandwa Road, Indore 17, MP, India.
authors.forename: Kavita
authors.initials: K
authors.lastname: Kabra
authors.forename: Rubina
authors.initials: R
authors.lastname: Chaudhary
authors.forename: R L
authors.initials: RL
authors.lastname: Sawhney
mesh_terms: D000327:Adsorption; D002384:Catalysis; D019343:Citric Acid / Q000737:chemistry*; D003300:Copper / Q000302:isolation & purification*; D007854:Lead / Q000302:isolation & purification*; D008956:Models, Chemical; D009532:Nickel / Q000302:isolation & purification*; D010777:Photochemistry; D013472:Sunlight; D013816:Thermodynamics; D015032:Zinc / Q000302:isolation & purification*
chemical_list: D019343:Citric Acid; D007854:Lead; D003300:Copper; D009532:Nickel; D015032:Zinc