Effect of time on desorption capacity of LNC/MMT.

<p>Desorption experiments-sample dose, 0.1000 g; HNO₃ concentration, 0.2 mol/L; temperature, 60°C.</p

Langmuir (a) and Freundlich (b) isotherm equations fitting curves of the experimental data.

<p>T = 70°C, pH = 6.8, t = 40 min.</p

Effects of time on adsorption by LNC/MMT at various initial Ni(II) concentrations.

<p>Effects of time on adsorption by LNC/MMT at various initial Ni(II) concentrations.</p

Effect of the initial Ni(II) concentration on adsorption capacity of LNC/MMT.

<p>Adsorption experiments-sample dose, 0.1000 g; pH, 6.8; temperature, 70°C; time, 40 min.</p

Effect of temperature on desorption capacity of LNC/MMT.

<p>Desorption experiments-sample dose, 0.1000 g; HNO₃ concentration, 0.2 mol/L; time, 30 min.</p

XRD patterns of MMT (a) and LNC/MMT nanocomposite (b).

<p>XRD patterns of MMT (a) and LNC/MMT nanocomposite (b).</p

Effect of pH on adsorption capacity of LNC/MMT.

<p>dsorption experiments-sample dose, 0.1000 g; the initial Ni(II) concentration, 0.0032 mol/L; temperature, 70°C; time, 40 min.</p

TEM images of purified MMT (a) and LNC/MMT (b).

<p>TEM images of purified MMT (a) and LNC/MMT (b).</p

Effect of time on adsorption capacity of LNC/MMT.

<p>Adsorption experiments-sample dose, 0.1000 g; the initial Ni(II) concentration, 0.0032 mol/L; pH, 6.8; temperature, 70°C.</p

Effects of initial Ni(II) concentration on adsorption by LNC/MMT at various temperatures.

<p>Effects of initial Ni(II) concentration on adsorption by LNC/MMT at various temperatures.</p