C 0	dye concentration in time t0 (M).
C	dye concentration in time t (M).
Ds	crystallite size obtained from Scherrer method (nm).
DW-H	crystallite size obtained from Williamson-Hall method (nm).
k	first-order reaction rate constant (h−1).
k’	zero-order reaction rate constant (ppm h−1).
K	shape factor (/)
t 0	initial irradiation time (h)
t	irradiation time (h)
βhkl	full width at half maximum at (hkl) plane.
ε	lattice strain obtained from the Williamson-Hall method.
λ	wavelength of incident X-ray (1.5406 Å)
θ	XRD diffraction angle (degree).