Hydrophilic polydimethylsiloxane-based sponges for dewatering applications

Separation of water from non-polar liquid mixtures (dewatering) is a challenging, yet an important problem in such fields as petroleum industry and power coolants. We describe a method of fabrication and properties of a high-capacity hydrophilic sponge based on polydimethylsiloxane (PDMS). The sponge is obtained by addition of 1-octanol and incorporating zinc chloride powder template in the precursor PDMS liquid followed by heat curing at 115 degrees C with subsequent elution of the template. The produced PDMS sponges have water absorbing capacity reaching approx. 1600%, which is two times higher than typically known for dewatering sorbents. Those high-capacity sponges may find use as dewatering agents for oils, hydrocarbons and other nonpolar liquids. (C) 2020 Elsevier B.V. All rights reserved.