Issue 44, 2020

Rational structural design of ZnOHF nanotube-assembled microsphere adsorbents for high-efficient Pb2+ removal

Abstract

Adsorbents with high effective adsorption capabilities have attracted extensive interest and are promising for the removal of heavy metal ions from wastewater. Herein, we prepared well-dispersed ZnOHF microspheres with efficient adsorptive removal toward Pb2+ in an aqueous environment via an amino acid assisted hydrothermal method. 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. By taking advantage of the large specific surface areas of nanotube-assembled microspheres (271.06 m2 g−1), the maximum adsorption capacity for Pb2+ was up to 285.7 mg g−1 in solution. Further analysis revealed the key role of the geometry structure of fine nanotube-assembled microspheres in boosting their adsorption ability. Furthermore, we proposed a potential growth mechanism of the as-prepared microspheres. The thermodynamic study of Pb2+ adsorbed on nanotube-assembled ZnOHF microspheres suggests that it is an endothermic and spontaneous process. This finding may open a new avenue to design efficient sorbents with high surface areas and effective heavy metal or organic dye removal ability in solution.

Graphical abstract: Rational structural design of ZnOHF nanotube-assembled microsphere adsorbents for high-efficient Pb2+ removal

Supplementary files

Article information

Article type
Paper
Submitted
03 Sep 2020
Accepted
17 Sep 2020
First published
17 Sep 2020

CrystEngComm, 2020,22, 7543-7548

Rational structural design of ZnOHF nanotube-assembled microsphere adsorbents for high-efficient Pb2+ removal

Y. Guo, N. Liu, T. Sun, H. Cui, J. Wang, M. Wang, M. Wang and Y. Tang, CrystEngComm, 2020, 22, 7543 DOI: 10.1039/D0CE01279C

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