Co3O4 co-doped TiO2 nanoparticles as a selective marker of lead in aqueous solution

Co 3 O 4 co-doped TiO 2 nanoparticles were prepared by a low temperature thermal method and their functional relationships with metal ions was investigated using solid phase extraction. The analytical potential of Co 3 O 4 co-doped TiO 2 nanoparticles was studied for the selective extraction of lead using inductively coupled plasma-optical emission spectrometry. The selectivity of Co 3 O 4 co-doped TiO 2 nanoparticles was investigated toward different metal ions, including Cd( ii ), Co( ii ), Cr( iii ), Cu( ii ), Fe( ii and iii ), Hg( ii ), La( iii ), Mn( ii ), Ni( ii ), Pb( ii ), Pd( ii ) and Y( iii ). Data obtained from the selectivity study showed that Co 3 O 4 co-doped TiO 2 nanoparticles have the highest selectivity toward Pb( ii ). The uptake capacity for Pb( ii ) was experimentally calculated to be 114.05 mg g −1 . Moreover, adsorption isotherm data of Pb( ii ) on Co 3 O 4 co-doped TiO 2 nanoparticles fit well with the Langmuir adsorption isotherm, strongly supporting that the adsorption process was mainly as a monolayer on Co 3 O 4 co-doped TiO 2 nanoparticle surfaces. Co 3 O 4 co-doped TiO 2 nanoparticles were prepared and showed selective extraction toward Pb( ii ).