title: Effect of pH on solar photocatalytic reduction and deposition of Cu(II), Ni(II), Pb(II) and Zn(II): speciation modeling and reaction kinetics.
abstract: 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).
authors.affiliation: School of Energy and Environmental Studies, Devi Ahilya University, Takshashila Campus, Khandwa Road, Indore-452017, M.P., 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; D003300:Copper / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D007854:Lead / Q000737:chemistry*; D008027:Light; D008670:Metals / Q000737:chemistry; D009532:Nickel / Q000737:chemistry*; D010777:Photochemistry / Q000379:methods*; D013472:Sunlight; D013816:Thermodynamics; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*; D015032:Zinc / Q000737:chemistry*
chemical_list: D007477:Ions; D008670:Metals; D007854:Lead; D003300:Copper; D009532:Nickel; D015032:Zinc