Selective Adsorption and Photocatalytic Clean‐Up of Oil by TiO2 Thin Film Decorated with p‐V3D3 Modified Flowerlike Ag Nanoplates. Issue 14 (2nd March 2022)

• Record Type: Journal Article
• Authors: Shondo, Josiah; Veziroglu, Salih; Tjardts, Tim; Fiutowski, Jacek; Schröder, Stefan; Mishra, Yogendra Kumar; Strunskus, Thomas; Rubahn, Horst‐Günther; Faupel, Franz; Aktas, Oral Cenk
• Is Part Of: Advanced materials interfaces. Volume 9:Issue 14(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-03-02
• Subjects: flowerlike nanoplates -- initiated chemical vapor deposition -- oil clean‐up -- photocatalytic layer -- selective oil adsorption; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.202102126
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract: Various methods are developed and used to treat oil‐contaminated water, including mechanical separation, chemical treatment, biological treatment, membrane filtration, and sorption. Oil clean‐up via selective sorption of the oil by an engineered surface is the most accepted technique due to its high removal efficiency and low cost. Here, a multifunctional surface providing highly selective oil sorption and clean‐up capability via the photocatalytic decomposition is proposed. This novel surface is named as the "three‐in‐one (3‐in‐1) surface" since it is composed of 1) a highly photocatalytic layer, 2) micro‐ and nanostructures, and 3) a low surface energy layer. First, the TiO2 photocatalytic layer is prepared by magnetron sputtering. Then flowerlike Ag nanoplates are photocatalytically deposited on the sputtered TiO2 layer. Afterward, a low surface energy layer, poly‐1, 3, 5‐trivinyl‐1, 3, 5‐trimethylcyclotrisiloxane (p‐V3 D3 ), is over‐coated on Ag/TiO2 surface by initiated chemical vapor deposition (iCVD) while retaining the topographical features of the surface (micro‐ and nanoscale surface structures). The p‐V3 D3 /Ag/TiO2 surface demonstrates a high selective adsorption to oil whereas simultaneously it shows extreme repellency to water. The p‐V3 D3 /Ag/TiO2 surface can also be photocatalytically cleaned up and this may find applications in various technology fields including water treatment, microfluidics, self‐cleaning, and water harvesting. Abstract : A stable superhydrophobic and photocatalytically active surface by the 3‐in‐1 approach combines 1) photocatalytic thin film, 2) micro‐and nanostructures, and 3) low surface energy coating. The superhydrophobic (wetting contact angle > 160°) and photocatalytically active p‐V3 D3 /Ag/TiO2 surface shows high selectivity to oil adsorption which may lead to several functional applications in oil‐water separation, microfluidics, self‐cleaning, and water harvesting technologies.