Journal of Materials Chemistry A
Paper
each reaction needed an acid and a base catalyst respectively. As
a result of the synergistic effect of the acid–base co-operative
catalysis, all the two steps could be accomplished in a single pot
with excellent activity, which were better than the individually
8 K. M. Parida and D. Rath, J. Mol. Catal. A: Chem., 2009, 310,
93.
9 K. M. Parida, S. Mallick, P. C. Sahoo and S. Rana, Appl. Catal.,
A, 2010, 381, 226.
graed acid and base functional moieties on the clay surface. 10 S. Rana, S. Mallick and K. M. Parida, Ind. Eng. Chem. Res.,
The investigation revealed that the one-pot Henry reaction 2011, 50, 2055.
requires a synergistic co-operative effect of both an acid and a 11 S. Mallick, S. Rana and K. M. Parida, Dalton Trans., 2011, 40,
base, which was provided by SO H-APTES@K10-MMT. Most 9169.
3
importantly, the catalyst was reusable, which is an important 12 B. Voit, Angew. Chem., Int. Ed., 2006, 45, 4238.
step towards simple systems with the potential for commercial 13 H. Groger, Chem. – Eur. J., 2001, 7, 5246.
exploitation of heterogeneous catalysts in one-pot reactions. 14 F. Gelman, J. Blum and D. Avnir, J. Am. Chem. Soc., 2000, 122,
Apart from its ability to act as an effective bi-functional catalyst
in the one-pot Henry reaction, it was also potent enough to 15 J. D. Bass, A. Solovyov, A. J. Pascal and A. Katz, J. Am. Chem.
adsorb many heavy metal cations, due to the presence of S and Soc., 2006, 128, 3737.
N atoms in the functional groups helping in water pollution 16 X. Yu, Y. Zou, S. Wu, H. Liu, J. Guan and Q. Kan, Mater. Res.
abatement. Studies on synthesis of such multi-functionalized Bull., 2011, 46, 951.
catalysts for employment in many other one-pot reaction 17 G. D. Yadav and A. D. Murkute, Adv. Synth. Catal., 2004, 346,
sequences as well as treating them as the effective adsorbents 389.
for water pollution remediation are underway in our laboratory. 18 L. Valentini, M. Cardinali and J. M. Kenny, Carbon, 2010, 48,
61.
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8
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Acknowledgements
The authors are extremely thankful to Professor B. K. Mishra,
Director, CSIR-IMMT, Bhubaneswar-751013, Odisha, India, for
his constant encouragement and permission to publish this
work. GBBV and SKR are obliged to CSIR for a senior research
fellowship.
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2
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