are prone to forming stable complexes with ligands carrying softer
donor atoms, and vice versa. Sulfur has been regarded as a softer
donor atom, and therefore it is understandable that the thiolated
adsorbent exhibited higher complexation affinity for the softer
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2
+
metal ion Hg , but much lower complexation affinity for the
2
+
2+ 18,33
10 X. Wu, J. Ruan, T. Ohsuna, O. Terasaki and S. Che, Chem. Mater.,
other relatively harder metal ions (Cu , Cd ).
The mercury
2
007, 19, 1577.
adsorbed could be readily removed by washing the mercury-
loaded light-yellow adsorbent with concentrated HCl, followed by
filtration and washing with water. A white powder was obtained,
1
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+
and dried in vacuum at 333 K. The adsorption capacity of Hg
ions only experienced a slight decrease in the second and third
applications.
1
Conclusions
2
4, 5038.
In conclusion, functionalized chiral porous silica nanorods were
synthesized by a one-step co-condensation process using an achiral
surfactant and silicon alkoxides. Chiral MCM-41 pore structures
were realized by using an achiral surfactant as template under
static conditions, indicating that the driving force for the formation
of chiral silica structures not only exist in the system using chiral
molecules, but also exists in systems using achiral surfactants.
The obtained porous silica nanostructures show highly selective
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Acknowledgements
This work was supported by the National Natural Science
Foundation of China (Grants Nos. 10776034 and 20471065) and
the Knowledge Innovation Program of the Chinese Academy of
Sciences (Grant No. KGCX2-YW-111–5).
2
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