Ultrahigh fluid sorption capacity of superhydrophobic and tough cryogels of cross-linked cellulose nanofibers, cellulose nanocrystals, and Ti₃C₂T_x MXene nanosheets

Abstract

Here, we present superhydrophobic, hierarchical, and nanostructured cryogels made from cellulose nanofibers (CNFs) and nanocrystals (CNCs), double cross-linked with MXene nanosheets and poly(vinyl alcohol) (PVA) in the presence of tetradecylamine.

Fabrication of a Flexible SERS Sensing Platform with High Sensitivity and Its Application in Monitoring of Trace Benzotriazole in Tap Water

“…From Figure C, we can find the XPS peaks at 530.5 and 532.1 eV, which should be from the C–Ti–O/TiO 2 –F and Ti–OH bonds in the Ti 3 C 2 nanosheets. In addition, we can also observe the XPS peak which is originated from the C–O bonds of PVA and PDDA at 533.0 eV. , The N 1s high-resolution XPS spectrum of Ag (0.33)-PVA/MXene (2)-PDDA shown in Figure D indicates that there exists an XPS peak at 401.8 eV. This peak should be derived from the N + of PDDA molecules .…”

“…In addition, we can also observe the XPS peak which is originated from the C−O bonds of PVA and PDDA at 533.0 eV. 43,44 The N 1s high-resolution XPS spectrum of Ag (0.33)-PVA/MXene (2)-PDDA shown in Figure 4D indicates that there exists an XPS peak at 401.8 eV. This peak should be derived from the N + of PDDA molecules.…”

Highly Efficient Separation for Aqueous Viscous Oils Enabled by a Wood-Based Cellulose Aerogel with a Superhydrophilic Protonated Coating

“…The persistent incidents of petroleum spills and the extensive release of industrial oily wastewater have inflicted considerable damage on ecological and economic systems, as well as human health. − Simultaneously, water within crude oil transmission pipelines and gasoline poses significant safety risks. − Hence, there is an urgent demand for treatment strategies with the high efficiency of the oil–water separation capacity. Recently, cellulose aerogels with eco-friendly, recyclable, cost-effective nature and good mechanical performance have drawn considerable attention for the applications of oil/water separation. − In particular, wood-based cellulose aerogels, utilizing abundant natural raw materials, exhibited high adsorption capacity and environmental friendliness. − For example, Wu et al developed a superhydrophilic cellulose aerogel with a layered structure based on natural wood, and its separation efficiency of immiscible aqueous oil reached 99.97% …”