Novel modified wood ear mushroom sticks biochar aerogel spheres for efficient capture of Cd2+ and Pb2+ mix-ions from water

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-HAP MB ${}_{\mathrm{MB}}$ ). The surface structure and adsorption mechanism of the CA-HAP MB ${}_{\mathrm{MB}}$ 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-HAP MB ${}_{\mathrm{MB}}$ for Cd 2 + ${\mathrm{Cd}}^{2+}$ and Pb 2 + ${\mathrm{Pb}}^{2+}$ were investigated for their adsorption properties in water and their competition. The adsorption capacities of Cd 2 + ${\mathrm{Cd}}^{2+}$ and Pb 2 + ${\mathrm{Pb}}^{2+}$ 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-HAP MB ${}_{\mathrm{MB}}$ composite aerogel spheres have a good application prospect in capturing heavy metal ions from water.