A novel microbial induced synthesis of hydroxyapatite with highly efficient adsorption of uranyl(VI)

Abstract

Due to the pore structure and specific surface area of hydroxyapatite (HA), they facilitate their application as an adsorbent material. Herein, assembled from nano-particles, a high specific surface area and porous HA has been synthesized by bacterial induction. The morphology and structure of the as-synthesized products were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, scanning electron microscopy, and Brunauer–Emmett–Teller gas sorptometry analyses. The results indicated that the HA with high specific surface area (196.7 m2/g) were prepared successfully. Notably, the batch adsorption experiment for uranyl ions (UO22+) indicated that the maximum adsorption capacity was 1025 mg/g, and the adsorption process remained consistent with the linear pseudo-second-order kinetic and nonlinear Liu isotherm adsorption models. The desorption effect was good (the desorption rate reached 97.94%). And it has excellent biocompatibility. Ultimately, a possible adsorption mechanism for the HA nanoparticles was proposed.