Photocatalytic oxidation of Reactive Red 195 by bimetallic Fe-Co catalyst: Statistical modeling and optimization via Box-Behnken design

Khyle Glainmer N Quiton; Yao-Hui Huang; Ming-Chun Lu

doi:10.1016/j.chemosphere.2023.139509

Photocatalytic oxidation of Reactive Red 195 by bimetallic Fe-Co catalyst: Statistical modeling and optimization via Box-Behnken design

Chemosphere. 2023 Oct:338:139509. doi: 10.1016/j.chemosphere.2023.139509. Epub 2023 Jul 15.

Authors

Khyle Glainmer N Quiton¹, Yao-Hui Huang², Ming-Chun Lu³

Affiliations

¹ School of Chemical, Biological, and Materials Engineering and Sciences, Mapúa University, Intramuros, Manila, 1002, Philippines; Department of Chemical Engineering, National Cheng Kung University, Tainan, 701, Taiwan.
² Department of Chemical Engineering, National Cheng Kung University, Tainan, 701, Taiwan. Electronic address: yhhuang@mail.ncku.edu.tw.
³ Department of Environmental Engineering, National Chung Hsing University, Taichung, 40227, Taiwan. Electronic address: mmclu@nchu.edu.tw.

PMID: 37459934
DOI: 10.1016/j.chemosphere.2023.139509

Abstract

Response surface methodology (RSM) is an effective tool for process optimization with multi-complex operational factors. The present work aims to model and optimize the photocatalytic oxidation (PCO) parameters of Reactive Red 195 (RR195) dye decoloration with the SiO₂-supported Fe-Co catalyst (FCS) derived from a novel catalyst synthesis method, fluidized-bed crystallization (FBC) process, using Box-Behnken design (BBD) as the RSM statistical model. The Fe-Co@SiO₂ catalyst was successfully fabricated using the FBC process, and it showed good catalytic activity and performance toward the degradation of RR195. The extent of the effects of pH, H₂O₂ dosage (HD), catalyst loading (CL), and operating time (t) on the decoloration of RR195 was studied. Hence, the order of variable significance follows the sequence: pH > t > CL > HD. pH has the most significant effect among the variables for RR195 decoloration. The decoloration efficiency predicted by the BBD model was 88.3% under the optimized operation conditions of initial pH of 3.15, 0.76 mM H₂O₂, 1.18 g L^-1 FCS and 59.4 min of operating time. The actual decoloration efficiency was very close to the predicted value indicating that BBD can efficiently be utilized to optimize RR195 degradation with FCS under the PCO system.

Keywords: Bimetallic catalyst; Box-Behnken design; Fluidized-bed crystallization; Photocatalytic oxidation; RSM; Reactive red 195.

MeSH terms

Azo Compounds* / chemistry
Catalysis
Hydrogen Peroxide / chemistry
Models, Statistical
Oxidation-Reduction
Photochemical Processes
Silicon Dioxide

Substances

Hydrogen Peroxide
reactive red 195
Silicon Dioxide
Azo Compounds