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Zaharaddeen N. Garba,Wei Xiao,Weiming Zhou,Ibrahim Lawan,Yifan Jiang,Mingxi Zhang,Zhanhui Yuan 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.11
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 (pHpzc) as well as BET analysis, yielding a mesoporous adsorbent with surface area of 61.130m2 g−1 as well as 223.55 and 239.45mg 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.
Weiming Zhou,Yifan Jiang,Shichang Sun,Mingxin Zhang,Ibrahim Lawan,Gerard Franklyn Fernando,Liwei Wang,Zhanhui Yuan 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.2
A simple one step wet-chemical method assisted by trisodium citrate was employed in the synthesis of BiOBr applied as a photocatalyst. Photocatalytic activity of the BiOBr was investigated for the degradation of Rhodamine B (RhB) dye under visible light irradiation (>420 nm). The results indicated that trisodium citrate is more favorable to the formation of hierarchical architectures and reduces the particle size of BiOBr photocatalyst. BiOBr with hierarchical architectures exhibiting significantly higher catalytic activity than that with ordinary nanostructure. The significant improvement could be attributed to the high specific surface area (24.14m2·g1), average pore sizes (34.09 nm) and average pore volume (0.24 cm3·g1).
Huilan Ye,Yiting Wu,Ziqing Zhong,Shichang Sun,Jia Chen,Weiming Zhou,Ibrahim Lawan,Liwei Wang,Zhanhui Yuan 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.4
A Bi6O6(OH)3(NO3)3·1.5H2O (BBN)/Bi2O2CO3 (BOC) heterojunction was designed for the first time via afacile hydrothermal method. The photocatalytic performance of catalysts was evaluated by degrading Rhodamine B(RhB) under simulated solar light irradiation. It was found that the degradation rate of RhB by 25 wt%BBN/BOC wasdramatically increased about 1.5 and 4.7 times compared with that of pure BOC and BBN, respectively. The enhancedphotocatalytic performance migth be attributed to the effective separation of photoinduced electron-hole pairs, benefitingfrom the construction of heterojunction. Furthermore, the mechanism upon BBN/BOC composites photocatalystwas investigated, expecting this work will bring new insight into the theoretical study and application of semiconductorsmaterials.