Morphology-controlled synthesis of calcium titanate particles and adsorption kinetics, isotherms, and thermodynamics of Cd(II), Pb(II), and Cu(II) cations.

Author(s) Hang, Y.; Si, Y.; Zhou, Q.; Yin, H.; Wang, A.; Cao, A.
Journal J Hazard Mater
Date Published 2019 Jun 28
Abstract

CaTiO particles with different particle sizes and morphologies were synthesized starting from CaCl and titanium (IV) isopropoxide with or without the use of organic modifier by the hydrothermal synthesis method. Without the use of organic modifier, nanosized CaTiO particulates were mainly formed at the hydrothermal temperatures of 120 C and 140 C whereas CaTiO cuboids were predominantly formed at 180 C. The utility of polyethylene glycol as an organic modifier favored the formation of small-sized CaTiO nanoparticulates. However, cetyltrimethyl ammonium bromide and trisodium citrate induced the formation of CaTiO cuboids. The adsorption of heavy metallic Cd(II), Pb(II), and Cu(II) cations on CaTiO powders was well illustrated by the pseudo-second-order adsorption kinetics. The Langmuir adsorption isotherm with the correlation coefficients (R) of 0.9946-0.9967 well fitted their adsorption at equilibrium. The adsorption processes were spontaneous and endothermic. The CaTiO powders synthesized by the hydrothermal method had higher adsorption capacities for Cd(II) (82.6 mg g) and Pb(II) (261.8 mg g) cations than the porous CaTiO powders synthesized by the solid-state calcination method reported in literatures. The as-synthesized CaTiO powders by the hydrothermal method could have potential application in the removal of heavy metallic cations from waste water.

DOI 10.1016/j.jhazmat.2019.120789
ISSN 1873-3336
Citation Hang Y, Si Y, Zhou Q, Yin H, Wang A, Cao A. Morphology-controlled synthesis of calcium titanate particles and adsorption kinetics, isotherms, and thermodynamics of Cd(II), Pb(II), and Cu(II) cations. J Hazard Mater. 2019;380:120789.

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