Repository of Research and Investigative Information

Repository of Research and Investigative Information

Ilam University of Medical Sciences

Application of surfactant-modified montmorillonitefor As(III) removal from aqueous solutions: kinetics and isotherm study

Sat Jun 22 19:09:45 2024

(2018) Application of surfactant-modified montmorillonitefor As(III) removal from aqueous solutions: kinetics and isotherm study. Desalination and Water Treatment. pp. 236-248. ISSN 1944-3994

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The prime objective of this research was to develop a systematic method for the removal of arsenic (III) from aqueous solutions by adsorption. Thus, montmorillonite modified with tetradecyltrimethylammonium bromide (TTAB) was utilized to prepare an outstanding sorbent. Subsequently, this novel material was characterized and identified completely by different techniques: X-fluorescence spectrometer (XRF), Sear's procedure (titratin method), scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Moreover, the effects of solution pH (4-12), surfactant loading rates (20-200 cation exchange capacity (CEC) of the clay), contact time (10 min-5 h), pollutant concentration (500-3000 mu g/l), temperature (15-45 degrees C) and adsorbent dose (0.1-1.0 g) on the adsorption process were investigated. At the optimum values, the effects of contact time on adsorption and the dependency of adsorption data to different kinetic models like pseudo-first-order, pseudo-second-order, Elovich and intra-particle diffusion were assessed; it was found that the process of arsenic (III) removal followed a pseudo second-order kinetic model (R-2 = 0.9998). Following the optimization of the variables, by fitting the experimental equilibrium to the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models and the respective information for each model and their applicability were examined to understand the conceptual of the adsorption. According to R-2 (0.9999) and maximum adsorption capacity (1.48 mg g(-1)), it was found that the adsorption process followed the Langmuir model. The thermodynamic study also showed the spontaneous and endothermic nature of the adsorption process.

Item Type: Article
Keywords: Arsenic (III) adsorption Surfactant-modified montmorillonite Isotherm models Variable optimization activated carbon arsenic removal iron-oxide contaminated water particle-size congo red adsorption adsorbents equilibrium sorption Engineering Water Resources
Page Range: pp. 236-248
Journal or Publication Title: Desalination and Water Treatment
Journal Index: ISI
Volume: 115
Identification Number:
ISSN: 1944-3994
Depositing User: مهندس مهدی شریفی

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