By taking advantage of the large specific surface areas of nanotube-assembled microspheres (271.06 m 2 g −1), the maximum adsorption capacity for Pb 2+ was up to 285.7 mg g −1 in solution. The obtained microspheres were self-assembled by numerous nanotubes with an outer diameter of ∼10 nm and a wall thickness of about 3.5 nm. Herein, we prepared well-dispersed ZnOHF microspheres with efficient adsorptive removal toward Pb 2+ in an aqueous environment via an amino acid assisted hydrothermal method. Adsorbents with high effective adsorption capabilities have attracted extensive interest and are promising for the removal of heavy metal ions from wastewater.
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