ORIGINAL RESEARCH
Photocatalytic Performance of TiO2-ZnAl LDH
Based Materials: Kinetics and Neural Networks
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University of Novi Sad, Faculty of Technology Novi Sad, Bul. cara Lazara 1, Novi Sad, Serbia
Submission date: 2021-12-22
Acceptance date: 2022-03-01
Online publication date: 2022-06-06
Publication date: 2022-09-01
Corresponding author
Milica Hadnadjev-Kostic
Chemical engineering, Faculty of Technology, University of Novi Sad, bul. Cara Lazara 1, 21000, Novi Sad, Serbia
Pol. J. Environ. Stud. 2022;31(5):4117-4125
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ABSTRACT
Photodegradation of azo dyes from industrial wastewater is challenging due to their high stability
and resistance to removal. In this study, a generalized predictive model for photodegradation behavior
of TiO2 containing ZnAl layered double hydroxide (LDH) based materials in the removal process
of cationic azo dyes (Rhodamine B and Methylene Blue) was proposed. The performed kinetic
investigation suggested good correlation of the experimental results with theoretical settings and
revealed that all photocatalysts in both photocatalytic removal reactions followed the pseudo-first
order Langmuir-Hinshelwood reaction model. The inputs for artificial neural network (ANN) included
four experimental variables: TiO2 loading onto LDHs, organic dye type used for the removal process,
temperature of thermal treatment of photocatalysts and reaction time, whereas for the two ANN
prediction outputs removal efficiency and photo-degradation rate constants were used. The optimal
topology was determined to be a three-layer feed-forward ANN with 3 input neurons and 10 hidden
neurons, 3-10-1.