Catalyst efficiency through the disorder kinetics to identify its nonlinearity in their properties of Ag₃PO₄@TiO₂ catalyst using UV–visible spectroscopy

Abstract Photocatalysis has a significant role in water remediation. During the process of photocatalysis, catalysts face different problems, such as instability and inefficiency. Here, we are introducing a new method, ‘nonlinearity kinetics’, which will help to identify this kind of problem during photocatalytic activity. We are considering Ag 3 PO 4 @TiO 2 to study nonlinear disorder kinetics. Ag 3 PO 4 is a highly photoactive compound with an inherent photocorrossive nature. Here, it addresses the challenge of pure Ag 3 PO 4 by transforming composite materials to Ag 3 PO 4 @TiO 2 and by studying its nonlinear kinetics during photocatalysis. The Ag 3 PO 4 @TiO 2 underwent preliminary characterisation. Increment of crystalline nature studied through XRD. FESEM and TEM analysed morphological alignment and diffraction patterns. The functional behaviour of oxygen, Ag, Ti and P–O–P were identified through the FT-IR spectra. The reduced optical band gap Ag 3 PO 4 @TiO 2 was 2.9 eV Obtained from the UV–visible spectra. Photocatalysis activity was performed, and newly introduced disorder kinetics were observed. The nonlinear fit of the kinetics shows a shift over time (intercept value of linear fit −0.27) that indicates the corrosive characteristics. For an efficient catalyst, this value must be equivalent to zero. The photocorrossive disorder kinetics study demonstrates the disorder and nonlinearity of the catalyst and catalytic medium when it does not fit with a linear fit. To identify a disorder, it is important to look at the disorder kinetics of analysis.