Process optimization and synthesis of lanthanum-cobalt perovskite type nanoparticles (LaCoO₃) prepared by modified proteic method: Application of response surface methodology

Zaharaddeen N. Garba^*,**, Wei Xiao^*, Weiming Zhou^*, Ibrahim Lawan^*,

Yifan Jiang^*, Mingxi Zhang^*, and Zhanhui Yuan^*

^* College of Materials Science and Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian Province, China

^** Department of Chemistry, Ahmadu Bello University Zaria, Nigeria

Abstract

Due to increasing interest in the application of perovskites as promising adsorbents, the present study looks at how central composite design (CCD), a subset of response surface methodology (RSM), can statistically play a role in producing optimum lanthanum oxide-cobalt perovskite type nanoparticles (LaCoO₃) by using a modified proteic synthesis method. The optimum LaCoO₃ produced was tested for its capability in removing methyl orange (MO) and rhodamine B (RhB) dyes from aqueous solution. Calcination temperature and calcination time were optimized with the responses being percentage yield, MO and RhB removal. The best temperature and calcination time obtained were 775 ^oC and 62mins, respectively, giving good and appreciable values for the three responses. The resulting optimal LaCoO₃ was characterized by Fourier transform infra-red (FTIR), ultraviolet-visible spectrophotometry (UV/vis), scanning electron microscopy (SEM), pH of zero point charge (pH pzc) as well as BET analysis, yielding a mesoporous adsorbent with surface area of 61.130 m² g^-1 as well as 223.55 and 239.45 mg g^-1 as the monolayer adsorption capacity values for MO and RhB, respectively. Freundlich model was the best in describing the equilibrium adsorption data with respect to both MO and RhB with the kinetic data for the two dyes both obeying pseudo-second-order kinetics model.

Keywords

LaCoO₃, Perovskite, Modified Proteic Method, Adsorption, Methyl Orange, Rhodamine B

Down this paper：19-Korean J. Chem. Eng.-Process optimization and synthesis of lanthanum-cobalt perovskite type nanoparticles (LaCoO3) prepared by modified proteic method.pdf