Novel robust cellulose-based foam with pH and light dual-response for oil recovery

doi:10.1007/s11706-018-0420-5

Front. Mater. Sci.

2018, Vol. 12

Issue (2) : 118-128 https://doi.org/10.1007/s11706-018-0420-5

RESEARCH ARTICLE

Novel robust cellulose-based foam with pH and light dual-response for oil recovery

Qian WANG¹, Guihua MENG¹, Jianning WU¹, Yixi WANG¹, Zhiyong LIU¹(

), Xuhong GUO^1,²

¹. School of Chemistry and Chemical Engineering, Shihezi University/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan/Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region/Engineering Research Center of Materials-Oriented Chemical Engineering of Xinjiang Bingtuan, Shihezi 832003, China
². State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

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Abstract

We fabricated pH and light dual-responsive adsorption materials which could induce the transition of surface wettability between hydrophobicity and hydrophilicity by using ATRP. The structure and morphology of adsorption materials were confirmed by ATR-FTIR, XPS, TGA and SEM. It showed that the modified cellulose (CE)-based foam was hydrophobic, which can adsorb a range of oils and organic solvents in water under pH= 7.0 or visible light irradiation (λ>500 nm). Meanwhile, the wettability of robust CE-based foam can convert hydrophobicity into hydrophilicity and underwater oleophobicity under pH= 3.0 or UV irradiation (λ = 365 nm), giving rise to release oils and organic solvents. Most important of all, the adsorption and desorption processes of the modified CE-based foam could be switched by external stimuli. Furthermore, the modified CE-based foam was not damaged and still retained original performance after reversible cycle repeated for many times with variation of surface wettability. In short, it indicates that CE-based foam materials with switchable surface wettability are new responsive absorbent materials and have owned potential application in the treatment of oil recovery.

Keywords cellulose-based foam dual-responsive adsorption materials switchable wettability oil recovery

Corresponding Author(s): Zhiyong LIU

Online First Date: 18 May 2018 Issue Date: 29 May 2018

Cite this article:

Qian WANG,Guihua MENG,Jianning WU, et al. Novel robust cellulose-based foam with pH and light dual-response for oil recovery[J]. Front. Mater. Sci., 2018, 12(2): 118-128.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-018-0420-5
https://academic.hep.com.cn/foms/EN/Y2018/V12/I2/118

Fig.1 The synthetic route of pH and light dual-responsive CE-based foam.

Fig.2 Scheme 1 The schematic illustration of pH and light dual-responsive CE-based foam.

Fig.3 SEM images of (a)(b) pristine CE-based foam and (c)(d) modified CE-based foam.

Fig.4 ATR-FTIR spectra of CE-based foam before and after modification.

Fig.5 XPS spectra of CE-based foam before and after modification.

Tab.1 The contents of different kinds of elements

Fig.6 TGA spectra of CE-based foam before and after modification.

Fig.7 The wettability of CE-based foam. Water CAs of (a) the pristine CE-based foam, (b) the treated CE-based foam with a CA of 148°, (c) the treated CE-based foam in pH= 3.0, and (d) the treated CE-based foam after UV irradiation. (e) The oil CA of the treated CE-based foam under water.

Fig.8 Absorption of organic solvents by a modified CE-based foam. Snapshots of the removal processes of (a) DCE (dyed with Sudan III) sinking at the bottom and (b) DMF (dyed with Sudan III) floating on water.

Fig.9 Absorption capacity of the modified CE-based foam for various oils and organic solvents.

Fig.10 Adsorption recyclability of the modified CE-based foam for DCE.

Fig.11 Variations in the water CA of the modified CE-based foam after per 5 cycles.

Fig.12 CA transition cycles of the modified CE-based foam via the pH adjustment.

Fig.13 (a) Repelling oil process by acid treated and UV-irradiated modified CE-based foam. (b) Oil-loaded modified CE-based foam can release oil under pH= 3.0 and UV irradiation. (c) Oil-loaded modified CE-based foam can release oil under UV irradiation.

Fig.14 The desorption recyclability of the modified CE-based foam for chloroform in the condition of UV and pH= 3.0.

Fig. S1 Adsorption recyclability of P2VP-modified and SP-modified foams for DCE.

Fig. S2 The desorption recyclability of P2VP-modified and SP-modified foams for chloroform.

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