Abstract
High fluoride contaminated in ground water and surface water has been prompting researchers to look for a high-efficiency, low-cost, environmental-friendly method. A novel micron zirconia/zeolite molecular sieve (ZrO2-Ze) composite was synthesized and its characterization and adsorption mechanism for fluoride was studied. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR) were used to analyze the structure and morphology of the ZrO2-Ze adsorbents. Experimental conditions such as adsorbent dose (0.5–7.0 g/150 mL), contact time (2–12h), pH value (3–12) and temperature (5–40 °C) were optimized. The ZrO2-Ze adsorbents with fluoride removal rate of 94.89% were processed under conditions of dose 2 g/150 mL, contact time 8 h, pH value 6 and temperature 25 °C. Batch adsorption experiments showed that fluoride adsorption followed the pseudo-second-order kinetics. Freundlich isotherm model can better describe the behavior of ZrO2-Ze adsorption of fluoride. Thermodynamic parameters (ΔH°, ΔS° and ΔG°) were calculated to indicate an exothermic and randomness reaction process. The results in adsorption and regeneration tests showed the evidence that ZrO2-Ze composite was a promising adsorbent for fluoride removal.
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