Abstract
Ultrafast and facile microwave hydrothermal approach was applied to synthesize gallotannin modified carbon nanotube composites (CNT-GT) for effective recovery of Ga(III) from aqueous solutions. The successful preparation of CNT-GT composites was ascertained by a series of characterization techniques including TEM, FTIR, TGA, BET, Raman, XPS and Boehm titration. The CNT-GT obviously enhanced Ga(III) adsorption capability (170.8 mg g−1) as compared with the unmodified carboxylic carbon nanotubes (CNT-COOH). The CNT-GT composites had superior selectivity and excellent reusability. The adsorption mechanism of CNT-GT is based on the ion exchange of the surface hydroxyl hydrogen of CNT-GT with Ga(OH)2+, Ga(OH)2+, or Ga3+. In a word, the method described in this paper should be a quick and simple way to prepare highly efficient adsorbents, which has definite significance for the application of the environment.
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