Double-functional characteristics of a surface molecular imprinted adsorbent with immobilization of nano-TiO2
✍ Scribed by Haijia Su; Qiang Li; Tianwei Tan
- Book ID
- 102316426
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2006
- Tongue
- English
- Weight
- 301 KB
- Volume
- 81
- Category
- Article
- ISSN
- 0268-2575
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✦ Synopsis
Abstract
A new chitosan molecular imprinted adsorbent obtained by immobilization of nano‐TiO~2~ on the adsorbent surface (surface‐imprinted adsorbent with nano‐TiO~2~) was prepared. Based on photocatalytic reaction and the surface molecular imprinting technology, this new kind of surface‐imprinted adsorbent with immobilization of nano‐TiO~2~ can not only adsorb template metal ions but can also degrade organic pollutants. The results showed that, after the nano‐TiO~2~ was immobilized on the adsorbent surface, the adsorption ability for the imprinted ion (Ni^2+^) of this new imprinted adsorbent immobilized with nano‐TiO~2~ was not affected, but the degradation ability for p‐nitrophenol (PNP) of the surface‐imprinted adsorbent with nano‐TiO~2~ increased three‐fold compared with that of the surface‐imprinted adsorbent without nano‐TiO~2~, from 23.8 to 76.1% (at an initial PNP concentration of 20 mg·dm^−3^). The optimal TiO~2~ concentration in the adsorbent preparation was 0.025 g·TiO~2~ g^−1^ adsorbent. The removal capacity for PNP reached 60.25 mg·g^−1^ (at 400 mg·dm^−3^ initial PNP concentration) under UV irradiation. The surface‐imprinted adsorbent with nano‐TiO~2~ can be reused for at least five cycles without decreasing the removal ability for PNP and the imprinted ion (Ni^2+^). Copyright © 2006 Society of Chemical Industry