Evaluation of Removal Performance of Environmentally Friendly Nanoabsorbent Materials for Industrial Wastewater Pollutants
The adsorption performance of fluorine in industrial wastewater was studied by preparing nano-magnesium oxide.The pure nano-MgO and nano-MgO adsorbed with fluorine were characterized by Fourier transform infrared spectroscopy and energy dispersion analysis.The results showed that the specific surface area of the adsorbent was 92.46 m2·g-1,and the best fluorine removal effect(90%)was achieved when the dosage of nanomagnesium oxide was 0.6 g·L-1.The adsorption of fluorine by nano-magnesium oxide was less sensitive to pH changes.Adsorption of fluoride ions was mainly affected by the presence of hydroxyl ions.The presence of other ions was found to have no significant effect on the fluorine adsorption capacity of magnesium oxide nanoparticles.The Freundlich model described the quasi-secondary kinetic processes during adsorption better than the Langmuir model.Regeneration test results showed that 1.0 mol·L-1 eluent desorbed 95.0%of fluoride ions,followed by NaOH(2.0 mol·L-1)with 25.0%regeneration rate.
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