Digital images for removal of Sudan III dyed-soybean oil from the surface of water (a–c) and snapshots showing the oil–water separation by using PFOTES-CGF as the oil absorbent. (a) 2 mL red-colored soybean oil was mixed with 50 mL distilled water to form an oil layer, (b) PFOTES-CGF can quickly absorb the red-colored oil layer and then float on the water, (c) with the removal of PFOTES-CGF from the water, a transparent aqueous solution was observed, (d) during the oil–water separation process, the oil can get through and dropped into the below beaker, while the water was totally retained on the filter paper, and (e) water was collected from the filter paper and oil was absorbed by the PFOTES-CGF and then dropped into the below beaker. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)