Abstract
In the study, Fe3O4/TiO2 nanocomposite (FTNC) is synthesized and employed for Direct Green 26 (DG26) adsorption from aqueous solutions. The instruments of X-ray diffraction (XRD), energy dispersive X-ray (EDX) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), and vibrating sample magnetometer (VSM) were utilized for nanocomposite characterization. The experiments were conducted based on a Box-Behnken design including the FTNC dosage (A: 0.16 − 0.40 g L−1), pH (B: 3 − 9), contact time (C: 16 − 30 min), and ionic strength (D: 0.01 − 0.05 mol L−1), as the independent variables. The obtained data were fitted to a second-order response surface model with a high correlation coefficient (R2 = 0.9699) which predicted the optimum conditions (A = 0.40 g L−1, B = 3, C = 29 min, and D = 0.03 mol L−1) with an adsorption percentage of 97.50 ± 0.60. The kinetic data agreed well (R2 > 0.99) with the pseudo-second-order model. Moreover, investigating the adsorption isotherms of Langmuir, Temkin, Dubinin-Radushkevich, and Freundlich showed that DG26-FTNC adsorption system followed Langmuir model and an adsorption capacity of 200 mg g−1 was achieved for the magnetic nanocomposite.
Article Highlights
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Fe3O4/TiO2 magnetic nanocomposite was synthesized and employed for Direct Green 26 adsorption from aqueous solutions.
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The effects of the nanocomposite dosage, pH, contact time and ionic strength on the dye removal efficiency were investigated by conducting a Box-Behnken experimental design.
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Response surface modeling accurately predicted the optimum conditions of operation.
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The magnetic nanocomposite showed a monolayer adsorption capacity of 200 mg g-1.
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The dye-nanocomposite adsorption system followed the pseudo-second order kinetic model.
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All data generated and analyzed during this study are included in this published article.
Change history
08 December 2022
A Correction to this paper has been published: https://doi.org/10.1007/s41742-022-00497-4
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The authors thankfully acknowledge the support from Rasht Branch, Islamic Azad University, Iran.
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MA: experimentation, data analysis, writing the original draft of the manuscript. FS: supervision, project administration, interpretation, writing—review & editing the manuscript.
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41742_2022_467_MOESM3_ESM.tif
Supplementary file3 Fig. S1 Plots of a) pseudo-second order and b) intraparticle diffusion kinetic models for DG26-FTNC adsorption system (FTNC dosage of 0.40 g L-1, pH=3 and ionic strength of 0.03 mol L-1). (TIF 326 KB)
41742_2022_467_MOESM4_ESM.tif
Supplementary file4 Fig. S1 Plots of a) pseudo-second order and b) intraparticle diffusion kinetic models for DG26-FTNC adsorption system (FTNC dosage of 0.40 g L-1, pH=3 and ionic strength of 0.03 mol L-1). (TIF 250 KB)
41742_2022_467_MOESM5_ESM.tif
Supplementary file5 Fig. S2 Plots of qt versus time for assessing DG26 adsorption onto FTNC by isotherm models of a) Langmuir, b) D-R, c) Temkin and d) Freundlich (FTNC dosage of 0.40 g L-1, pH=3 and ionic strength of 0.03 mol L-1). (TIF 330 KB)
41742_2022_467_MOESM6_ESM.tif
Supplementary file6 Fig. S2 Plots of qt versus time for assessing DG26 adsorption onto FTNC by isotherm models of a) Langmuir, b) D-R, c) Temkin and d) Freundlich (FTNC dosage of 0.40 g L-1, pH=3 and ionic strength of 0.03 mol L-1). (TIF 323 KB)
41742_2022_467_MOESM7_ESM.tif
Supplementary file7 Fig. S2 Plots of qt versus time for assessing DG26 adsorption onto FTNC by isotherm models of a) Langmuir, b) D-R, c) Temkin and d) Freundlich (FTNC dosage of 0.40 g L-1, pH=3 and ionic strength of 0.03 mol L-1). (TIF 319 KB)
41742_2022_467_MOESM8_ESM.tif
Supplementary file8 Fig. S2 Plots of qt versus time for assessing DG26 adsorption onto FTNC by isotherm models of a) Langmuir, b) D-R, c) Temkin and d) Freundlich (FTNC dosage of 0.40 g L-1, pH=3 and ionic strength of 0.03 mol L-1). (TIF 341 KB)
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Alizadeh, M., Safa, F. Magnetic Nanocomposite of TiO2 as Efficient Adsorbent for Direct Green 26 Dye: Multivariate Optimization, Kinetic and Equilibrium Isotherms. Int J Environ Res 16, 107 (2022). https://doi.org/10.1007/s41742-022-00467-w
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DOI: https://doi.org/10.1007/s41742-022-00467-w