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Open AccessArticle

Acid Dye Removal from Aqueous Solution by Using Neodymium(III) Oxide Nanoadsorbents

1
Department of Environmental Health, Zabol University of Medical Sciences, Zabol 986161588, Iran
2
PhD of Environmental Health, Infectious Diseases and Tropical Medicine Research Center, Resistant Tuberculosis Institute, Zahedan University of Medical Sciences, Zahedan 9816743463, Iran
3
Department of Physics, Faculty of science, University of Zabol, Zabol 538-98615, Iran
4
Department of Environmental Health, Kerman University of Medical Sciences, Kerman 7616913555, Iran
5
Department of Chemical Engineering, Nnamdi Azikiwe University, Awka 420218, Nigeria
6
Department of Chemistry, International Hellenic University, 654040 Kavala, Greece
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(3), 556; https://doi.org/10.3390/nano10030556 (registering DOI)
Received: 10 February 2020 / Revised: 11 March 2020 / Accepted: 18 March 2020 / Published: 19 March 2020
(This article belongs to the Special Issue Nanomaterials and Nanotechnology in Wastewater Treatment)
In the current work, neodymium oxide (Nd2O3) nanoparticles were synthesized and characterized by means of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The major aim/investigation of this research was to fit/model and optimize the removal of Acid Blue 92 (AB92) dye from synthetic effluents (aqueous solutions) using the adsorption process based on neodymium oxide (Nd2O3) nanoparticles. To optimize the adsorption conditions, central composite design (CCD) based on response surface methodology (RSM) was applied. The effects of pH (3–9), adsorbent dosage (0.1–1 g/L), initial concentration of AB92 (100–300 mg/L), and contact time (10–100 min) on the adsorption process were investigated. Apart from equilibrium and kinetic experiments, thermodynamic evaluation of the adsorption process was also undertaken. The adsorption process was found to have the best fitting to Langmuir isotherm model and pseudo-second-order kinetic equation. Also, the process was found to be spontaneous and favorable with increased temperature. The optimal conditions found were: pH = 3.15, AB92 concentration equal to 138.5 mg/L, dosage of nanoadsorbent equal to 0.83 g/L, and 50 min as contact time, which resulted in 90.70% AB92 removal. High values for the coefficient of determination, R2 (0.9596) and adjusted R2 (0.9220) indicated that the removal of AB92 dye using adsorption can be explained and modeled by RSM. The Fisher’s F-value (25.4683) denotes that the developed model was significant for AB92 adsorption at a 95% confidence level. View Full-Text
Keywords: acid blue 92; response surface methodology; adsorption; neodymium(iii) oxide; central composite design; water treatment acid blue 92; response surface methodology; adsorption; neodymium(iii) oxide; central composite design; water treatment
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MDPI and ACS Style

Ahmadi, S.; Mohammadi, L.; Rahdar, A.; Rahdar, S.; Dehghani, R.; Adaobi Igwegbe, C.; Kyzas, G.Z. Acid Dye Removal from Aqueous Solution by Using Neodymium(III) Oxide Nanoadsorbents. Nanomaterials 2020, 10, 556.

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