Preparation of montmorillonite–alginate nanobiocomposite for adsorption of a textile dye in aqueous phase: Isotherm, kinetic and experimental design approaches

Optimization of the adsorption of a textile dye onto nanoclay using a central composite design

“…The basal spacing of this phase was significantly enlarged by pretreatment as a result of this swelling feature. 17,20 Interlayer spacing of MMT was quantitatively assessment using the Debye-Scherrer equation d = (kλ /β cos θ). In this equation d is the thickness of the crystal, k is the Debye-Scherrer constant (0.89), k is the X-ray wavelength (0.15406 nm), b is width of the peak with the maximum intensity in half height, and h is the diffraction angle.…”

“…The high fitting for this equation showed the presence of chemical and strong electrostatic attractions between the functional groups of adsorbent and adsorbate molecules or an activated adsorption mechanism. 4,17 The adsorption kinetics of BY2 onto the MMT surface was also studied on the basis of the intraparticle diffusion model and the experimental data were fitted to the intraparticle diffusion model, indicating that the adsorption process occurred via a multistep mechanism involving exterior surface adsorption and subsequent intraparticle or pore diffusion. 4,17,47 Table 5 shows that the order of adsorption rate was the first stage (k i1 ) < second stage (k i2 ).…”

“…17,48 The Freundlich isotherm is an empirical equation derived by assuming a heterogeneous adsorbent surface with its adsorption sites being at varying energy levels. 4,17,48 By considering the high R 2 value (R 2 = 0.9792) obtained from the Freundlich model, it can be said that this model provides a better fit to the experimental data (see Table 6). In our study, when comparing the regression coefficient values for both Langmuir and Freundlich isotherms, it was demonstrated that the Freundlich isotherm was the most appropriate in describing the equilibrium data for dye adsorption at the studied temperature.…”

Application of Synthetic Layered Sodium Silicate Magadiite Nanosheets for Environmental Remediation of Methylene Blue Dye in Water

“…Moreover, different clays were used for environmental remediation for the removal of heavy metals [14,15], the antimicrobial peptides nisin and pediocin [16], herbicides [17], vitamin B1 [18], and different organic dyes [19][20][21][22][23]. However, the application of synthetic nano-clay magadiite(SNCM) for the elimination and remediation of different contaminants from the water environment is rare in the literature [24][25][26]; extra effort is desired to discover the adsorption capabilities of synthetic nano-clay magadiite as an effective adsorbent for the elimination of organic dye, as an specimen of organic contaminants-a main class of ecological contaminants that are insistent in the environment and cause antagonistic possessions on both fauna and flora.…”

Application of novel nanobiocomposites for removal of nickel(II) from aqueous environments: Equilibrium, kinetics, thermodynamics and ex-situ studies

“…Biopolymer-based composites have been reported as promising adsorbents for the treatment of wastewater since they show improved properties such as biodegradability and non-toxicity. Various biopolymers and nanoparticles, or a combination of both, have been reported for the removal of pollutants like dyes [9], pesticides [10], heavy metals [11,12] and anions [13] from aqueous environments. Clay-based nanocomposites have become the materials of interest due to their nanosized structural and functional properties.…”