Zirconia was immobilized on the inner surface of the foramen of the eggshell of Artemiasalina by surface settling technology to prepare zirconia loaded biological composite (LC-Zr). The results of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and X-ray diffraction (XRD) show that the pore canal is only reduced on the basis of the original size, and there is no particle agglomeration and pore blockage phenomenon. The particle size of zirconia is not more than 50 nm, and it is loaded onto the inner surface of the eggshell pore by coating. It is proved that the pore presents progressive ladder distribution of the eggshell and conventional distribution of the eggshell compared with the traditional carrier material; the carrier material has the double action mechanism of large pore enhanced mass transfer effect, and has obvious advantages. Through the study of adsorption performance, it was found that in the presence of conventional anions SO2? 4 , Cl? and NO? 3 100 mL of fluorine-containing sewage (F? = 10.00 mg/L) was only added with 0.8 g of LC-Zr for 30 min with a fluorine removal rate of 91.73%, and the adsorption of LC-Zr on fluorine ions was basically not affected by pH value. The kinetic experiments also showed that LC-Zr had a large adsorption capacity and a good defluorination effect. The research preliminarily proved that the eggshell of the foraminifera played a unique role in the preparation of zirconium loaded composite adsorbent, which provided a theoretical basis for the purification of fluorine-containing wastewater and the development of environment-friendly composite adsorbent.
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