Synthesis of (cinnamate-zinc layered hydroxide) intercalation compound for sunscreen application

BMC Chemistry

Table 2 Correlation coefficient, rate constant and half time obtained by fitting the release data of cinnamate from ZCA intercalation compound into various media using zeroth-, first-, parabolic diffusion and pseudo-second order kinetic models

Media	Saturated release (%)	Correlation coefficient, r²				Rate constant of pseudo second order, k(L mg^-1min^-1)	t_1/2of pseudo second order(min)
Media	Saturated release (%)	Zeroth order	First order	Parabolic diffusion	Pseudo-second order	Rate constant of pseudo second order, k(L mg^-1min^-1)	t_1/2of pseudo second order(min)
Deionized water	47.34	0.9277	0.9568	0.9666	0.9990	9.09 × 10^-6	1924
0.5 mol/L NaCl	21.07	0.9422	0.9510	0.9876	0.9898	1.07 × 10^-5	2974
Phosphate buffer pH 5.5	57.16	0.8541	0.9075	0.9798	0.9928	1.38 × 10^-4	110

Zeroth order: C_t = kt + c, first order: −log(1−C_t) = kt + c, parabolic diffusion: C_t/C_eq = c + kt^0.5, pseudo second order: t/C_t = 1/k₂C_eq² + (1/q_e)t.
Notes: c = a constant; C_eq = concentration of anion at equilibrium; C_t = concentration of anion at time t.

ISSN: 2661-801X