Characterization and Evaluation of Zeolite A/Fe₃O₄Nanocomposite as a Potential Adsorbent for Removal of Organic Molecules from Wastewater

Abstract

In this work, zeolite (Z) and Z-Fe3O4 nanocomposite (Z-Fe3O4 NC) have been synthesized. The Fe3O4 nanoparticles were synthesized using the extract from maize leaves and ferric and ferrous chloride salts and encapsulated into the zeolite framework. The nanocomposite (Z-Fe3O4 NC) was characterized using X-ray diffractometer (XRD), Fourier-transform infrared (FT-IR) spectroscopy, energy-dispersive X-ray (EDX) spectroscopy, and scanning electron microscopy (SEM). The potential of Z-Fe3O4 NC as an adsorbent for removing methylene blue molecules (MB) from solution was examined using UV-Vis and kinetic and equilibrium isotherm models. The adsorption data fitted best with the pseudo-second-order model and Weber and Morris model, indicating that the adsorption process was chemisorption, while the Weber and Morris described the rate-controlling steps. The intraparticle diffusion model suggests that the adsorption processes were pore and surface diffusion controlled. The Langmuir isotherm model best describes the adsorption process indicating homogeneous monolayer coverage of MB molecules onto the surface of the Z-Fe3O4 NC. The maximum Langmuir adsorption capacity was 2.57 mg/g at 25°C. The maximum adsorption efficiency was 97.5%. After regeneration, the maximum adsorption efficiency achieved at a pH of 7 was 82.6%.

Synthesis and Characterization of Magnetic Fe3O4/Zeolite NaA Nanocomposite for the Adsorption Removal of Methylene Blue Potential in Wastewater Treatment

“…As seen in Figure 7(a), the absorbance spectrum of the as-synthesized ZA shows a significant decrease in the intensity and total sum of area under the fitted peaks at wavelength 664 nm compared to that of the initial MB solution. e calculated adsorption capacity (q e , mg•g −1 ) and the MB removal efficiency (R, %) of ZA sample are ∼32.99 mg•g −1 and ∼79.11%, respectively, which were close to those of the previously reports [20] (Table 2).…”

“…where a λi are the areas under the characteristic absorbed peaks centered at maximum wavelength λ i (nm). Under our experimental conditions, by applying the Voigt fitting function (using OriginPro ® 8.0 software), the absorbance spectrum of MB exhibits six main characteristic peaks centered at monochromatic wavelengths (λ i ) of ∼246, 292, 498, 572, 617, and 664 nm, which is the one employed in most literatures [1,2,20], as seen in Figure 1. erefore, the MB removal efficiency R (%) was calculated using equation 4.…”

“…e presence of [AlO 4 ] − in the zeolite framework introduces negative charges which is balanced by cations such as Ca 2+ , K + , and Na + [16]. Previous studies show that zeolite materials possess good adsorption efficiency for removal of heavy metals like arsenic [17], mercury [18], fluoride [19], and organic dyes [20] as adsorbents. Zeolite NaA [21], with chemical composition [Na 12 [(AlO 2 ) 12 (SiO 2 ) 12 ].…”

Extensive removal of thallium by graphene oxide functionalized with aza-crown ether

“…3c). 49 Adsorption usually involves three steps: membrane diffusion, intragranular diffusion and equilibrium adsorption. 50 The core step to removing Tl(I) was lm diffusion and intragranular diffusion, and the rates K p1 and K p2 were higher than K p3 (Table S2 †).…”

Synthesis and Application of Fe-Doped TiO2-Halloysite Nanotubes Composite and Their Potential Application in Water Treatment

“…From the study, the adsorption mechanisms were controlled by the PSO model with the highest R 2 values of 0.9961 and 0.9993 as compared to the PFO model with R 2 values of 0.9875 and 0.9589 for MB and RhB, respectively. e PSO model adsorption indicates that the adsorption of both MB and RhB molecules were controlled by chemisorption as a result of chemical bonds obtained through the exchange of electrons between the TiO 2 -Fe-HNTs and cationic dye molecules [50].…”