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Publicly Available Published by De Gruyter November 30, 2016

Simultaneous Removal of Toxic Cyanide and Cu(II) Ions from Wastewater by a Bi-functional Raspberry-like TiO2@yeast Microspheres

Hong-Ying Li , Bo Bai EMAIL logo , Deng-Wei Jing , Chen-Xu Ding , Hong-Lun Wang and You-Rui Suo

Abstract

A novel strategy for simultaneous removal of cyanide anions and copper cations was proposed. Firstly, TiO2@yeast hybrid microspheres with raspberry-like structure were fabricated by a facile hydrolysis method using titanium tetrachloride as Ti precursor. The physicochemical properties of the as-prepared samples were fully characterized. The bi-functional composites were then employed for the simultaneous removal of a typical mixture of cyanide and copper metal ions via bio-adsorption in dark and photo-catalysis under UV irradiation. The results showed that the satellitic TiO2 nanoparticles within the TiO2@yeast raspberry-like structure functioned as the photocatalytic active sites providing the electron/hole pairs, while the yeast cores worked as the adsorbent to capture the cyanide and copper ions onto the photocatalytic active sites. The synergistic effects of the bio-adsorption by yeast and photo-catalysis by the TiO2 nanoparticles over the bi-functional composites were demonstrated. Our results are expected to be of significant value for various environmental friendly applications.

Received: 2014-11-3
Revised: 2014-12-7
Accepted: 2014-12-12
Published Online: 2016-11-30
Published in Print: 2015-7-1

© 2016 by Walter de Gruyter Berlin/Boston

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