3,4-Dichlorophenoxyacetate interleaved into anionic clay for controlled release formulation of a new environmentally friendly agrochemical

Table 2 Rate constant, half time, and correlation coefficient ( r ² ) value

Aqueous solution (0.005 M)	Zeroth-order r²	First-order r²	Parabolic diffusion			Pseudo-second-order
Aqueous solution (0.005 M)	(3,000 min)	(3,000 min)	r ²	k(×10⁻³)	c	r ²	t_1/2(min) k(×10⁻⁴)	c
Na₃PO₄	0.315	0.549	0.390	15.50	0.797	1.000	39 2.458	0.698
Na₂CO₃	0.567	0.621	0.738	5.99	0.254	0.999	66 2.424	0.391
Na₂SO₄	0.215	0.228	0.340	4.32	0.717	0.999	74 2.235	1.360
NaCl	0.322	0.336	0.494	5.90	1.640	0.959	78 2.146	1.470

Obtained from the fitting of the data from 0 to 3,000 min of 3,4-D in the LDH interlayer into the aqueous solution containing various anions, phosphate, carbonate, sulfate, and chloride, by first-order, parabolic diffusion, and pseudo-second-order kinetics models.