Preparation and characterization of thermo- and pH dual-responsive 3D cellulose-based aerogel for oil/water separation
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Oily wastewater caused by industrial production and crude oil leakage has attracted worldwide attention. Here, a thermo- and pH dual-responsive biodegradable cellulose-based aerogel for oil–water separation was designed and prepared via surface-initiated atom transfer radical polymerization (ATRP) of non-fluorine-containing 2-dimethylaminoethyl methacrylate (DMAEMA). The cellulose-based aerogel exhibit switchable superhydrophilicity with a water contact angle (WCA) of 0° and hydrophobicity (WCA 130°) by modulating pH or temperature. The functionalized cellulose-based aerogels could be used to absorb the water under 60 °C (pH 7.0) and pH is 1.0 (T = 25 °C), while absorb oil underwater when the temperature is above 60 °C (pH 7.0) or pH is 13.0 (T = 25 °C). So this adsorbent were suitable for the separation of water-rich or oil-rich oil/water mixtures, and it could adsorb oil over ten times its own weight, and had a good reusability. What’s more, the cellulose-based aerogel is green, low cost, and environmental friendly, which makes it a promising candidate to be used for oil–water separation.
This work was supported financially by funding from the National Natural Science Foundation of China (21367022 and 51662036) and Bingtuan Innovation Team in Key Areas (2015BD003).
Compliance with ethical standards
Conflict of interest
The authors declare no competing financial interest.
Movie S1: Absorption of water at 25 oC after immersing in the 0.1 M HCl solution with pH of 1.0 (MP4 20075 KB)
Movie S2 Absorption of oil at 25 oC after immersing in the 0.1 M NaOH solution with pH of 13.0 (MP4 40339 KB)
Movie S3 Absorption of dichloromethane at 25 °C (MP4 33088 KB)
Movie S4 Absorption of dichloromethane at 60 °C (MP4 54210 KB)
- 36.S. Ma, Q. Mi, J. Yu, J.S. He, J. Zhang, Prog. Chem 26, 796 (2014)Google Scholar