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

Journal of Water and Environmental Nanotechnology

ARTICLE

Ghomashi, Peghah¹  Charkhi, Amir²  Kazemeini, Mohammad³  Yousefi, Taher² 

[1] Chemical engineering department, Azad University, south branch;Materials and Nuclear fuel research school, Nuclear Science and Technology Research Institute;Chemical engineering department, Sharif University of Technology

关键词: Nano powder;    Surface Modification;    HDTMA+;    Adsorption;   

DOI  :  10.22090/jwent.2020.03.007

学科分类：数学（综合）

来源: Iranian Environmental Mutagen Society

【 摘 要 】

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 HDTMAclinoptilolite is higher than unmodified zeolite and it is modeled by the pseudo-second kinetic model.

【 授权许可】

CC BY