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Hydrophobic poly(alkoxysilane) organogels as sorbent material for oil spill cleanup.

Marine pollution bulletin (2015-05-24)
Gulsah Ozan Aydin, Hayal Bulbul Sonmez
ABSTRACT

In this study, reusable poly(alkoxysilane) organogels with high absorption capacities were synthesized by the condensation of a cyclo aliphatic glycol (UNOXOL™) and altering the chain length of the alkyltriethoxysilanes. The structural and thermal properties of cross-linked poly(alkoxysilane) polymers were determined by FTIR, solid-state (13)C and (29)Si CPMAS NMR and TGA. The oil absorbency of poly(alkoxysilane)s was determined through oil absorption tests, absorption and desorption kinetics. Results showed that the highest oil absorbency capacities were found to be 295% for hexane, 389% for euro diesel, 428% for crude oil, 652% for gasoline, 792% for benzene, 792% for toluene, 868% for tetrahydrofuran, and 1060% for dichloromethane for the poly(alkoxysilane) gels based on UNOXOL™ and dodecyltriethoxysilane. Owing to their hydrophobic structure, the poly(alkoxysilane) organogels can selectively absorb crude oil from water. The reusability of the absorbents was quantitatively investigated, demonstrating that absorbents can be used effectively at least nine times.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Tetrahydrofuran, anhydrous, ≥99.9%, inhibitor-free
Sigma-Aldrich
Dichloromethane, anhydrous, ≥99.8%, contains 40-150 ppm amylene as stabilizer
Sigma-Aldrich
Toluene, anhydrous, 99.8%
Sigma-Aldrich
Tetrahydrofuran, anhydrous, contains 250 ppm BHT as inhibitor, ≥99.9%
Sigma-Aldrich
Hexane, anhydrous, 95%
Sigma-Aldrich
Benzene, anhydrous, 99.8%
Sigma-Aldrich
Tetrahydrofuran, suitable for HPLC, ≥99.9%, inhibitor-free
Sigma-Aldrich
Dichloromethane, suitable for HPLC, ≥99.9%, contains 40-150 ppm amylene as stabilizer
Sigma-Aldrich
Triethoxy(octyl)silane, 97%
Sigma-Aldrich
Argon, ≥99.998%
Sigma-Aldrich
Dodecyltriethoxysilane, technical
Sigma-Aldrich
n-Octadecyltriethoxysilane, AldrichCPR
Sigma-Aldrich
Tetrahydrofuran, contains 250 ppm BHT as inhibitor, ACS reagent, ≥99.0%
Sigma-Aldrich
Rhein
Sigma-Aldrich
Hexane, HPLC Plus, for HPLC, GC, and residue analysis, ≥95%
Sigma-Aldrich
Toluene, suitable for HPLC, ≥99.9%
Sigma-Aldrich
Rhein, technical grade
Sigma-Aldrich
Triethoxy(octyl)silane, deposition grade, 97%, 99.99% trace metals basis
Supelco
Dichloromethane solution, contains 10 % (v/v) methanol
Sigma-Aldrich
Argon-40Ar, 99.95 atom %
Supelco
Hexane, suitable for HPLC, ≥95%
Supelco
Toluene, HPLC grade, 99.8%
Supelco
Dichloromethane, ≥99.9%