Preparation and characterization of chitosan/Fe2O3 nano composite for the adsorption of thorium (IV) ion from aqueous solution

Abstract

In this study, novel chitosan/FeOnano composite Ch/Fe-O was synthesized and evaluated as an adsorbent for removing thorium (IV) (Th) ion from aqueous solution. The Ch/Fe-O was characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), Fourier transform infrared (FTIR) and scanning electron microscopy (SEM). Response surface methodology (RSM) was used in the optimization of Th adsorption for parameters such as pH, the initial metal ion concentration (Th concentration) and contact time. The statistical measures (i.e. analysis of variance, R, the lack of fit test and the P value) specify that the developed model is proper. Furthermore, the adsorption kinetics was well defined by the pseudo-second-order equation, while the adsorption isotherms were better fitted by the Langmuir model. The adsorption capacity of Ch/Fe-O was 430 mg Thg composite which leads to 99% removal at 25 °C. Moreover, thermodynamic parameters which state the natural and endothermic nature of the reactions were determined. The loaded Th can be easily regenerated with HNO and the Ch/Fe-O can be used repeatedly without any significant reduction in its adsorption capacity. The desorption level of Th from the Ch/Fe-O by using 0.1 M HNO, was more than 95%.

Industrial wastewater remediation using Hematite@Chitosan nanocomposite

“…This result approved with Keshvardoostchokami et al (2017) who used chitosan/ Fe 2 O 3 nanocomposite in removal of nickel, cadmium and lead from aqueous solution. The prepared HCS NC in our study adsorbs toxic ions in the order Pb(II) > Cd(II) > Cu(II) which is in agreement with Broujeni et al, 2018.…”

Capacity and Modeling of Acid Blue 113 Dye Adsorption onto Chitosan Magnetized by Fe2O3 Nanoparticles

“…The previously diagnosed bumps are completely covered, and more masses are dispersed onto the C-Fe2O3 surface, which denotes the existence of AB113 dye molecules on the C-Fe2O3 surface. Similar results relevant to the AFM analysis in the present study have been presented in previous works (Broujeni et al, 2018;Kyzas et al, 2013). The TGA graph of chitosan and C-Fe2O3 is presented in Fig.…”

“…In addition, the pore volume and mean diameter are 0.286 cm 3 /g and 17.2 nm, respectively. Compared with the documented surface area value for a sample of pure chitosan (91.4 m 2 /g) (Broujeni et al, 2018), it can be concluded that the coating of chitosan with Fe2O3 significantly enhances the surface area of this polymer. Notably, solid materials with a large surface area are favorable as adsorbents in adsorption treatment systems, as this parameter reflects the number of adsorption sites for pollutant molecules.…”

“…Coating used adsorbents with magnetic nanoparticles has also been recommended because this modification method not only improves the removal efficiency but also improves the economic efficiency, environmental compatibility, mechanical strength, reusability and scalability of the magnetized adsorbents (Xua et al, 2012;Kyzas et al, 2013). In this direction, Fe2O3 nanoparticles have been widely used (Broujeni et al, 2018;Mittal et al, 2014). However, the use of pure magnetic particles also has a drawback, as these particles have a high tendency to agglomerate in aqueous solution.…”

“…Sun et al used a chitosan/cellulose composite to adsorb lead ions from aqueous solutions (Sun et al, 2009). Furthermore, chitosan magnetized by Fe2O3 nanoparticles has also been employed for eradicating heavy metals from solutions (Chokami et al, 2017;Broujeni et al, 2018).…”