Fast-thermoresponsive carboxylated cellulose nanofibers/Ti3C2/exfoliated montmorillonite-poly(N-isopropylacrylamide) with switchable wettability for oil-water separation

被引：11

作者：

Tang, Rui ^{[1
]}

Jiang, Luying ^{[2
]}

Yan, Jingyuan ^{[2
]}

Xu, Shiqi ^{[2
]}

Pan, Liurui ^{[2
]}

Hu, Ya ^{[1
]}

Zhang, Hanbing ^{[2
]}

Tong, Zhangfa ^{[1
]}

机构：

[1] Guangxi Univ, Sch Chem & Chem Engn, Guangxi Key Lab Petrochem Resource Proc & Proc Int, Nanning 530004, Peoples R China

[2] Guangxi Univ, Sch Resources Environm & Mat, Nanning 530004, Peoples R China

来源：

SEPARATION AND PURIFICATION TECHNOLOGY | 2024年 / 339卷

基金：

中国国家自然科学基金;

关键词：

Fast-thermoresponsive; Switchable wettability; PNIPAAm; Oil -water separation; Exfoliated montmorillonite (MMTex) and Ti3C2;

D O I：

10.1016/j.seppur.2024.126580

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Oil absorbed by aerogels was an effective method for achieving efficient oil-water separation. However, absorbent regeneration and recovery of oil were key issues that limited the practical application of aerogels. In this work, carboxylated cellulose nanofibers/Ti3C2/exfoliated montmorillonite/poly(N-isopropylacrylamide) (CNF-C/Ti3C2/MMTex-PNI) with switchable wettability was exploited through coordinately introduced exfoliated montmorillonite (MMTex), Ti3C2-MXene and thermoresponsive poly(N-isopropylacrylamide) (PNIPAAm) into carboxylated cellulose nanofibers (CNF-C) by a facile one-step hydrothermal and in-situ co-precipitation process. CNF-C/Ti3C2/MMTex-PNI was capable of reversible transformation between hydrophobic/oleophilic and hydrophilic/oleophobic, when the environmental temperature was above or below the lower critical solution temperature (LCST: 32 degrees C) of PNIPAAm. CNF-C/Ti3C2/MMTex-PNI could absorb oil within 5 s (54-98 g & sdot;g(-1)) under 45 degrees C and desorb oil within 10 min (recovery efficiency exceeds 78 %) at 25 degrees C. Moreover, the addition of MMTex inhibited the oxidation of Ti3C2, and Ti3C2/MMTex synergistically enhanced the mechanical properties (complete recovery under 60 % strain) and thermal stability of CNF-C/Ti3C2/MMTex/PNI. After 20 cycles, the absorption and desorption capacities of CNF-C/Ti3C2/MMTex/PNI for oils all decreased by 15 %. Moreover, the synthesis and fast-thermoresponsive mechanism for CNF-C/Ti3C2/MMTex/PNI were proposed. In conclusion, this work provides a new reference for the synthesis and recycling of smart aerogels for oil-water separation.

引用

页数：17

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