Abstract
Fluoride contamination in drinking water poses serious health risks to humans, such as dental and skeletal fluorosis. In this study, novel composite-type adsorbents were synthesized from construction and institutional waste materials, which are abundant and inexpensive. The adsorbents were characterized by X-ray Diffraction (XRD), Thermogravimetry (TG), Derivative Thermogravimetry (DTG), Differential thermal analysis (DTA), Differential Scanning Calorimetry (DSC), Scanning Electron Microscope (SEM), Energy-dispersive X-ray (EDX) spectroscopy and Fourier-transform Infrared (FTIR). The adsorption performance of the adsorbents was evaluated by batch experiments under different conditions. The results showed that the adsorbents could effectively remove fluoride from water, with a maximum adsorption capacity of 15.16 mg/g at pH 7.0. The fluoride adsorption was initially quick followed by a slow adsorption attaining equilibrium in 150 min. The experimental data were best fitted by the Langmuir isotherm, and the adsorption kinetics followed a pseudo-second order model. Moreover, the adsorbents could be regenerated by using 0.1 M NaOH solution without significant loss of adsorption capacity. The findings suggest that this composite adsorbent is a promising and sustainable alternative for fluoride removal from water.
Published Version
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