Performance assessment of modified clinoptilolite and magnetic nanotubes on sulfate removal and potential application in natural river samples

Autor: Saeed Farzin, Mohammad Reza Hassanvand, Ali Shamshiri, Azam Akhbari, Seyed Farhad Mousavi, Amir Noori, Hossein Bonakdari, Amir Hossein Salami
Rok vydání: 2020
Předmět:
Zdroj: Journal of Inclusion Phenomena and Macrocyclic Chemistry. 97:51-63
ISSN: 1573-1111
1388-3127
DOI: 10.1007/s10847-020-00982-3
Popis: This study presents the adsorption of sulfate by clinoptilolite and magnetic nanotubes (MNT) from the Gamasiab river (Kermanshah, Iran) samples. The samples have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and Fourier-transform infrared spectroscopy (FT-IR). The results showed that selective methods were implemented properly for nanoparticle preparation. During the process operating, time was considered as the most significant factor in sulfate removal. Moreover, adsorbent to pollutant ratios (D/C), and pH was selected as control variables. The design of the experiment was used to find the optimal conditions for the use of adsorbents. The optimum adsorption points were obtained for the MNT at pH 8.97 and D/C = 6.12 and the clinoptilolite at pH 10.68 and D/C = 22.07. The effect of pH on the adsorbents indicated that the adsorbent performance in the alkaline condition has the highest efficiency. Hence, for MNTs, increasing pH value increased the adsorbance amount. To investigate the effect of D/C, the rate of adsorption showed an ascending trend. In addition, the equilibrium data were defined by Langmuir and Freundlich isotherm models, respectively. Freundlich isotherm well described the process of adsorbing sulfate by clinoptilolite with a correlation coefficient of 0.918. While the Langmuir isotherm was consistent with the adsorption process of sulfate by MNT with a correlation coefficient of 0.9728. The efficiency of sulfate adsorption for clinoptilolite and MNT in the natural river samples was calculated 91.5% and 97.8%, respectively. The results showed the superiority of MNT adsorption capability in river water conditions.
Databáze: OpenAIRE
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