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Removal of fluoride from wastewater by natural and modified nano clinoptilolite zeolite

Ghomashi, P ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.22090/jwent.2020.03.007
  3. Publisher: Iranian Environmental Mutagen Society , 2020
  4. Abstract:
  5. In this study adsorption of fluoride ion from high-fluorine solutions (<2000 ppm) using the natural and modified ground clinoptilolite is investigated. These low-cost adsorbents are carefully characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray fluorescence (XRF), thermos-gravimetry (TGA) and differential scanning calorimeter analysis (DSC). In order to enhance the fluoride removal capacity of natural zeolite, it is milled into nano-powders and modified using hexadecyltriammoniumions (HDTMA+). The kinetic, equilibrium, and thermodynamic of fluoride adsorption are measured and described by the well-known mathematical models. The Langmuir model is fitted to the experimental data of nano HDTMA-clinoptilolite with the average relative error (ARE) of 1.57%. According to Langmuir isotherm, the maximum adsorption capacity of nano clinoptilolite and nano HDTMA-clinoptilolite are determined 25.26 and 32.40 mg/g, respectively. The heat of fluoride adsorption onto the nano-clinoptilolite and nano HDTMA-clinoptilolite is calculated to equal to-82.57 and-60.46 kJ/mol, respectively. Kinetic studies indicated that fluoride adsorption rate on nano HDTMA-clinoptilolite is higher than unmodified zeolite and it is modeled by the pseudo-second kinetic model. © 2020, Iranian Environmental Mutagen Society. All rights reserved
  6. Keywords:
  7. Adsorption ; Clinoptilolite ; Fluoride ; HDTMA+ ; Nanopowder ; Surface Modification
  8. Source: Journal of Water and Environmental Nanotechnology ; Volume 5, Issue 3 , 2020 , Pages 270-282
  9. URL: http://www.jwent.net/article_44988.html