A novel chitosan/polyrhodanine nanocomposite: preparation, characterisation and application for Ni(II) ions removal from aqueous solution

Figures & data

Figure 1. FTIR spectra of (a) chitosan, (b) CS/PRh nanocomposite.

Figure 2. The proposed structure of CS/PRh nanocomposite.

Figure 3. SEM image of CS/PRh nanocomposite.

Figure 4. TEM image of CS/PRh nanocomposite.

Figure 5. Effect of pH on the adsorption of Ni(II) on CS/PRh nanocomposite.

Figure 6. Effect of contact time on adsorption of Ni(II) on CS/PRh nanocomposite.

Figure 7. Effect of adsorbent dose on adsorption of Ni(II) on CS/PRh nanocomposite.

Figure 8. Two- and three-parameters isotherms obtained using the non-linear method for the adsorption of Ni(II) on CS/PRh nanocomposite.

Table 1. Langmuir, Freundlich and Sips constants and correlation coefficients (R²) for the Ni(II) adsorption on CS/PRh nanocomposite.

Langmuir isotherm	Freundlich isotherm	Sips
	1.526

Table 2. Thermodynamic data of Ni(II) adsorption process on CS/PRh nanocomposite.

T(K)	ΔG (KJ mol^−1)	ΔH (KJ mol^−1)	ΔS (KJ mol^−1 K^−1)
298	−40.329	0.397	−0.134
308	−41.669
318	−43.009

Figure 9. Kinetic pseudo-second-order sorption kinetics of Ni(II) adsorption on CS/PRh nanocomposite.

Table 3. Kinetic parameters for adsorption of Ni(II) on CS/PRh nanocomposite.

	First-order kinetic model			Second-order kinetic model
8.60	5.011	8.24	0.343	0.769	8.60	0.999