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Abstract
A novel adsorbent was synthesized for the capture of heavy metals mixture in water by encapsulating hydroxyapatite-modified wood ear mushroom sticks biochar in calcium alginate beads (CA-HAPMB). The surface structure and adsorption mechanism of the CA-HAPMB were characterized by Scanning electron microscopy and X-ray energy dispersion spectroscopy (SEM-EDS), Fourier transform infrared spectrometer (FTIR), X-ray diffraction patterns (XRD), and X-ray photoelectron spectroscopy (XPS). Under different conditions, CA-HAPMB for Cd2+ and Pb2+ were investigated for their adsorption properties in water and their competition. The adsorption capacities of Cd2+ and Pb2+ on the aerogel spheres reached 302.2 mg g−1 (2.69 mmol g−1) and 564.5 mg g−1 (2.73 mmol g−1), respectively (based on Langmuir). The aerogel spheres are easier to collect than biochar materials. The results show that CA-HAPMB composite aerogel spheres have a good application prospect in capturing heavy metal ions from water.
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