Author(s): Nothando B. Sithole*Justice M. Thwala, Gabriel C. Bwembya
A Periodic Mesoporous Organosilica (PMO) is an organic-inorganic hybrid composition with ordered porous structure on a molecular imprinted polymer (MIP). A triblock copolymer Pluronic F127 poly(ethyle ne glycol)- poly(propylene glycol)-poly(ethylene glycol) as structure directing agent (SDA) and 1,4-bis(triethoxysilyl)benzene (BTEB) as a precursor were used to synthesis the PMO-MIP using a non-covalent approach. The non-covalent approachshowed a limited number of selective imprinted sites due to the lack of strong intermolecular attractions between DDT template and the BTEB precursor. However, treatment of PMO-MIP with chlorotrimethylsilane (CTMS) significantly reduced the SiO-H and Si-OH resulting in a more non-polar material. The synthesized PMO-MIP was able to recover 106%, 85% and 99% of DDT, DDD and DDE respectively which shows that it can be used not only for extraction of DDT and its metabolites from environmental samples but also as a clean-up for samples.