Modifying Of Charcoals By Organical Compauds
MODIFYING OF CHARCOALS BY ORGANICAL COMPAUDS
V. K. Yatsimirsky1, J. Silvestre-Alberto2,
A. Sepulveda-Escribano2, F. Rodriguer-Reinoso2,
A. A. Gorlova1, S. V. Mikhalovsky3, V. L. Budarin4
1Kiev Shevchenko University, 64, Vladimirskaya str.,
Kiev, 252033, Ukraine. Email: yats@chem.univ.kiev.ua
2Alicante University, Spain, Email: joaquin.silvestre@ua.es
3Department of Chemistry, University of York, York, Y01 5DD UK
4School of Pharmacy and Biomolecular Science, Univ. of Brighton,
Brighton BN2 4GJ UK
Active carbons in contrast to oxides sorbents have high adsorption capacity in respect to organic molecules. Modification of carbon surface, in particular, hydrophobization by grafting of nonpolar groups may improve their performance in reactions with nonpolar species, as well as increase selectivity of catalysts. Bimodal carriers with both hydrophobic groups for better adsorption of reagents and hydrophilic centres for metal immobilisation have been synthesised. Modification of active carbons will be performed as follows.
Fig.1
In the first stage carbon surface will be heated in an argon-hydrogen mixture for decarboxylating and reduction of the keto-groups. Further reduction will be achieved by treatment with sodium borohydride solution in absolute methanol (Fig.1). The last stage of the charcoal hydrophobization will be carried out by two alternative methods: i) treatment with organosilanes in toluene; ii) chlorination with carbon tetrachloride followed by the reaction with Grignard reagent (Fig.2).
Fig.2
It is shown that modification of AC can be achieved by treatment of the surface phenolic groups with vinyltrimethoxysilane or by treatment of chlorinated phenolic groups with a Grignard reagent.
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