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

Abstract

A chitosan polymer was magnetized by coating with magnetite Fe2O3 nanoparticles, and the resultant material (C-Fe2O3) was first characterized through scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy, transmission electron microscopy, atomic force microscopy, thermogravimetric, X-ray diffractometry, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller, and point of zero charge analyses. C-Fe2O3 was then employed as a separable and efficient adsorptive agent to remove acid blue 113 (AB113) dye from aqueous solution. The removal efficiency was optimized at different environmental parameter values (pH: 3-11, C-Fe2O3 dose: 0.1-1 g/L, initial AB113 dye concentration: 10-100 mg/L, adsorption time: 0-300 min, and temperature: 388-318 K). Under optimum conditions, an AB113 dye removal efficiency of 99.68% was achieved. In addition, the effect of the presence of NaCl, NaNO3, Na2CO3, and MgSO4 ions on the AB113 dye removal efficiency could be ranked as NaCl> NaNO3> MgSO4> Na2CO3. The statistical analysis using the coefficient of determination, root mean square error, chi-square test, sum of squared errors, and average relative error showed that the Freundlich and pseudo-second-order equations were the best mathematical models for fitting the isothermal and kinetics data. Further kinetics analyses showed that the adsorption of AB113 molecules on C-Fe2O3 active sites was dominated by the intraparticle diffusion process. Thermodynamic parameters indicated that the AB113 dye adsorption process was favorable, endothermic, and spontaneous. Furthermore, an increase in temperature had a positive impact on AB113 dye removal. The regeneration study confirmed the excellent shelf life of C-Fe2O3, with only a slight loss in the removal efficiency (<7%) being detected after six operational cycles of AB113 dye adsorption. Compared with other adsorbents, 3 C-Fe2O3 was more effective for the adsorption of AB113 dye, with an adsorption uptake up to 128 mg/g.

Natural and Synthetic Polymers Modified with Acid Blue 113 for Removal of Cr3+, Zn2+ and Mn2+

“…The Q m was 83.33 mg AB 113/g ARM and 35.58 mg RB5/g ARM [ 30 ]. Thus, 128 mg AB 113/g of C-Fe 2 O 3 was obtained (where C-Fe 2 O 3 is chitosan magnetized by Fe 2 O 3 nanoparticles) [ 31 ].…”

Diatomite Composited with a Zeolitic Imidazolate Framework for Removing Phosphate from Water

“… 52 As can be seen from Figure 11 , the kinetics adsorption of phosphate consists of three consecutive phases: bulk diffusion, film diffusion, and pore diffusion. 34 The first stage observed at 1.4 < t 0.5 < 3.9 min 0.5 was rapid, the rate slowed down slightly in the second phase, and equilibrium was established at the third stage. The diffusion of phosphate molecules through pores to the active sites of CZD at the third phase.…”

Novel Wastewater Treatment by Using Newly Prepared Green Seaweed–Zeolite Nanocomposite

“…Agglomerations and/or aggregations at greater doses of ZGS and Z lead to an increase in the diffusion path length for adsorption of CR leading in turn to a noticeable decrease in the rate of adsorption 61 − 64 as well as a general reduction in the sorbent–sorbate contact. 6 , 42 …”

“…Because of their higher activity, they generally represent nearly 50 to 70% of the total quantities of dyes directed toward each of plastic, textile, and paper industries. 6 One of those dyes is the anionic type of diazo-benzidine known as Congo red. The latter is very familiar with its high resistance to being biodegraded because of its complex aromatic structure.…”