Facile fabrication of 3D hierarchical micro-nanostructure fluorine-free superhydrophobic materials by a simple and low-cost method for efficient separation of oil-water mixture and emulsion

Xu, Xu; Li, Xiang; Chen, Yaoyue; Liu, Gui-Bin; Gao, Jiaxin; Liu, Junfei; Liu, Zhuang; Yue, Shuang

doi:10.1016/j.jece.2021.106400

Cited by 12 publications

(3 citation statements)

References 68 publications

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“…In addition, when an external force was used to immerse the composite sponge in water, there were plenty of trapped air bubbles around the sponge surface ( Figure 4 f). A similar phenomenon has also been widely reported in the literature [ 50 , 51 ]. The changes in the wetting property for superhydrophilic MF and superhydrophobic F-ZIF-90@PDA-MF are schematically illustrated in Figure 4 g. It can be explained that the grafted low surface energy of the CF 3 groups significantly decreases the surface energy and that the ZIF-90 nanocrystals improve the surface roughness [ 40 , 45 , 46 ].…”

Section: Resultssupporting

confidence: 85%

“…We used a scanning electron microscope (SEM) to examine the surface morphologies of composite sponges. The pristine MF sponge shows porous structures with micrometer-scale pores ( Figure 1 b) and a clean and smooth surface ( Figure 1 f) [ 45 , 51 ]. After PDA was coated on the MF surface, there was no noticeable change in the porous network structures ( Figure 1 c).…”

Section: Resultsmentioning

confidence: 99%

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Eco-Friendly Fluorine Functionalized Superhydrophobic/Superoleophilic Zeolitic Imidazolate Frameworks–Based Composite for Continuous Oil–Water Separation

2023

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Superhydrophobic metal−organic framework (MOF)-based sponges have received increasing attention in terms of treating oil−water mixtures. However, highly fluorinated substances, commonly used as modifiers to improve the hydrophobicity of MOFs, have aroused much environmental concern. Developing a green hydrophobic modification is crucial in order to prepare superhydrophobic MOF-sponge composites. Herein, we report the preparation of a porous composite sponge via a polydopamine (PDA)-assisted growth of zeolitic imidazolate frameworks (ZIF-90) and eco-friendly hydrophobic short-chain fluorinated substances (trifluoroethylamine) on a melamine formaldehyde (MF) sponge. The composite sponge (F-ZIF-90@PDA-MF) exhibited superhydrophobicity (water contact angle, 153°) and superoleophilicity (oil contact angle, 0°), which is likely due to the combination of the low surface energy brought on by the grafted CF3 groups, as well as the rough surface structures that were derived from the in situ growth of ZIF-90 nanoparticles. F-ZIF-90@PDA-MF showed an excellent adsorption capacity of 39.4–130.4 g g−1 for the different organic compounds. The adsorbed organic compounds were easily recovered by physical squeezing. Continuous and selective separation for the different oil−water mixtures was realized by employing the composite sponge as an absorbent or a filter. The separation efficiency and flux reached above 99.5% and went up to 7.1 ×105 L m−2 h−1, respectively. The results illustrate that the superhydrophobic and superoleophilic F-ZIF-90@PDA-MF sponge has potential in the field of water−oil separation, especially for the purposes of large-scale oil recovery in a water environment.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Eco-Friendly Fluorine Functionalized Superhydrophobic/Superoleophilic Zeolitic Imidazolate Frameworks–Based Composite for Continuous Oil–Water Separation

2023

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“…Materials with water contact angle greater than 90°are considered as hydrophobic and those with less than 90°are hydrophilic. [75] Figure 4 shows results on water contact angle measurements of unmodified NiO-Al 2 O 3 (NA) and stearic acid-modified NiO-Al 2 O 3 nanocomposites (NA(SA1), NA(SA2), and NA(SA3)) and the results are summarized in Table 4. The contact angle of unmodified NA nanocomposite is 62.3°suggesting it is hydrophilic.…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

Surface Modification of NiO‐Al₂O₃ Nanocomposites using Stearic Acid as a Modifier and their Applications in Self‐cleaning and Removal of Dyes

Narwal,

Jeevanandam

2024

ChemistrySelect

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In the present study, a quick surface modification method has been developed for the modification NiO‐Al2O3 nanocomposites using stearic acid (SA). The surface modification of NiO‐Al2O3 nanocomposites with stearic acid was confirmed by various analytical techniques (FT‐IR spectroscopy, thermal gravimetry (TG), carbon and hydrogen (CH) and XPS). There is no change in XRD patterns, and FE‐SEM and TEM images of NiO‐Al2O3 nanocomposites after modification with SA. FT‐IR analysis of SA modified NiO‐Al2O3 nanocomposites shows characteristic IR bands of carboxylate group. TG and CH analyses also confirm the presence of SA in the NiO‐Al2O3 nanocomposites. XPS analysis of SA modified NiO‐Al2O3 nanocomposites shows the presence of carbon atoms of stearic acid. The SA modified NiO‐Al2O3 nanocomposites show water contact angle greater than 90° which suggests their hydrophobic nature. The SA modified NiO‐Al2O3 nanocomposites were explored for self‐cleaning and also as adsorbent for the removal of crystal violet and rhodamine B dyes from aqueous solutions. The SA modified NiO‐Al2O3 nanocomposites remove the dyes within 30 minutes. The effect of various adsorption parameters (adsorbent dosage, contact time, pH, and temperature) was investigated to understand the optimum adsorption conditions. The SA modified NiO‐Al2O3 nanocomposites show better self‐cleaning property as compared to unmodified NiO‐Al2O3 nanocomposites.

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Preparation of porous poly(4‐tert‐butylstyrene) based monoliths with high efficiency for oil‐water separation via high internal phase emulsion template

Zhao

Shen

et al. 2023

J of Applied Polymer Sci

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Developing low‐cost and highly efficient hydrophobic absorbents via simple and environmentally friendly method is demanded for oil‐water separation. This paper reports the preparation of hydrophobic absorbents of porous poly(4‐tert‐butylstyrene‐co‐divinylbenzene) (poly(tBS‐co‐DVB)) via high internal phase emulsion (HIPE) template method. The effects of crosslinking degree and internal phase volume fraction on the porous structure and adsorption performance of the absorbents are investigated. As the tBS/DVB molar ratio increases from 1:1 to 4:1, the adsorption performance of poly(tBS‐co‐DVB) toward hexane first increases to a maximum at a molar ratio of 3:1 and then decreases. As the internal phase volume fraction increases, the specific surface area (SSA) and porosity of the poly(tBS‐co‐DVB)s notably increase from 33.06 m2/g and 84.07% to 102.89 m2/g and 92.94%, respectively. When the internal phase fraction is 95 vol%, the obtained poly(tBS‐co‐DVB) foam with a water contact angle of 140° shows an absorbing capacity as high as 70.21 g/g for dichloromethane. After 10 consecutive adsorption‐desorption cycles, the adsorption performance of the poly(tBS‐co‐DVB) foam shows only a slight decrease, indicating an excellent recycling ability. The obtained poly(tBS‐co‐DVB) foams exhibit the advantages of facile preparation, high oil absorption capacity and satisfactory recoverability, which enable them potential as sustainable oil adsorbents.

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Facile fabrication of 3D hierarchical micro-nanostructure fluorine-free superhydrophobic materials by a simple and low-cost method for efficient separation of oil-water mixture and emulsion

Cited by 12 publications

References 68 publications

Eco-Friendly Fluorine Functionalized Superhydrophobic/Superoleophilic Zeolitic Imidazolate Frameworks–Based Composite for Continuous Oil–Water Separation

Eco-Friendly Fluorine Functionalized Superhydrophobic/Superoleophilic Zeolitic Imidazolate Frameworks–Based Composite for Continuous Oil–Water Separation

Surface Modification of NiO‐Al₂O₃ Nanocomposites using Stearic Acid as a Modifier and their Applications in Self‐cleaning and Removal of Dyes

Preparation of porous poly(4‐tert‐butylstyrene) based monoliths with high efficiency for oil‐water separation via high internal phase emulsion template

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Facile fabrication of 3D hierarchical micro-nanostructure fluorine-free superhydrophobic materials by a simple and low-cost method for efficient separation of oil-water mixture and emulsion

Cited by 12 publications

References 68 publications

Eco-Friendly Fluorine Functionalized Superhydrophobic/Superoleophilic Zeolitic Imidazolate Frameworks–Based Composite for Continuous Oil–Water Separation

Eco-Friendly Fluorine Functionalized Superhydrophobic/Superoleophilic Zeolitic Imidazolate Frameworks–Based Composite for Continuous Oil–Water Separation

Surface Modification of NiO‐Al2O3 Nanocomposites using Stearic Acid as a Modifier and their Applications in Self‐cleaning and Removal of Dyes

Preparation of porous poly(4‐tert‐butylstyrene) based monoliths with high efficiency for oil‐water separation via high internal phase emulsion template

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Surface Modification of NiO‐Al₂O₃ Nanocomposites using Stearic Acid as a Modifier and their Applications in Self‐cleaning and Removal of Dyes