Abstract
For every mass product, there are problems associated with the resulting waste. Residues of hormones in urine cannot be removed sufficiently from wastewater, and this has undesired consequences. An ideal adsorbent would take up the impurity, enable a simple separation and recyclability. Polymer colloids with high affinity towards the drug, accessible porosity, high surface area, and stimuli‐responsive properties would be candidates, but such a complex system does not exist. Here, porous vinyl‐functionalized organosilica nanoparticles prepared from a styrene bridged sol‐gel precursor act as monomers. Initiation of the polymerization at the pore walls and addition of functional monomers result in a special copolymer, which is covalently linked to the surface and covers it. An orthogonal modification of external surface was done by click attachment of a thermoresponsive polymer. The final core‐shell system is able to remove quantitatively hydrophobic molecules such as the hormone progesterone from water. A change of temperature closes the pores and induces the aggregation of the particles. After separation one can reopen the particles and recycle them.
Highlights
For every mass product, there are problems associated with the resulting waste
The ideal scenario would be to shape a functional organic into a nanostructure with high surface area as it is present in porous solids
We describe a method for the selective functionalization of the pore system by free radical polymerization with different monomers
Summary
There are problems associated with the resulting waste. Residues of hormones in urine cannot be removed sufficiently from wastewater, and this has undesired consequences. The number and extension of review articles which have been written on (porous) organosilica materials documents a huge variety of functional groups incorporated in such hybrid structures.[12,13,14] These include thiols,[15] amines,[9] carboxylic acids,[16] azides,[17] halides[18] and alkynes.[19] Due to its versatility, the vinyl function takes on a special role among the organic modifications of silica surfaces It can be transformed into alcohols by hydroboration[20] or further functionalized by using established thiol-ene click chemistry.[21,22,23,24] vinyls are key constituents in many monomer molecules and their presence grants access to a high variety of organicpolymer hybrid materials.
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