Polydimethylsiloxane based sustainable hydrophobic/oleophilic coatings for oil/water separation: A review

Lipika,; Singh, Arun K.

doi:10.1016/j.clema.2022.100136

Cited by 10 publications

(9 citation statements)

References 71 publications

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“…72 Contact angle analysis confirmed successful hydrophobic Further increasing the PDMS concentration from 0.6 to 1.0 g led to a gradual decline in specific activity. The limitations inherent to the dip-coating method, including the requirement for smooth and defect-free surfaces, and the potential for nonuniformity and inconsistencies in coating thickness, 28 contribute to the observed challenges. Insufficient PDMS at lower concentrations might hinder optimal hydrophobic modification, while excessively high concentrations at higher concentrations could potentially bury the immobilized lipase, further supporting the observed trends.…”

Section: Characteristics Of Immobilized Lipase Over Macro-fe 3 O 4 -C...mentioning

confidence: 99%

Lipase Immobilization over Hierarchically Carbonized Macro-MIL-88A for Biodiesel Production

Rahim,

Zou,

et al. 2024

ACS Appl. Nano Mater.

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Macroporous metal−organic frameworks (MOFs) exhibit immense promise as carriers for immobilizing macromolecules, notably lipases. Nevertheless, their minute particle dimensions pose challenges in the recycling process, thereby significantly constraining their widespread practical utilization. To address this limitation, this study explores the potential of incorporating magnetic substances during the carbonization process, especially focusing on the use of magnetically carbonized Macro-MIL-88A for lipase immobilization and biodiesel production. The effects of different carbonation temperatures on macroporous MIL-88A and microporous MIL-88A were investigated. Our findings revealed that the carbonization temperature influenced the preservation of the 3D structure and the generation of magnetite. Carbonized Macro-MIL-88A (Macro-Fe 3 O 4 -C) at 500 °C exhibited superior specific activity and enhanced activity recovery. Lipase immobilized on Macro-Fe 3 O 4 -C (Macro-Fe 3 O 4 -C-TLL) demonstrated higher methanol tolerance during the biodiesel production process compared to Micro-Fe 3 O 4 -C. The reduced reusability of Macro-Fe 3 O 4 -C-TLL was attributed to the adsorption of the by-product glycerol. We further investigated pre-and posthydrophobic modifications on Macro-Fe 3 O 4 -C and found that post-PDMS modification maintained both high enzyme loading and good reusability of the immobilized lipase during biodiesel production. This study presents a promising method to enhance the reusability of immobilized large molecules by incorporating magnetite via a straightforward carbonization process.

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Section: Characteristics Of Immobilized Lipase Over Macro-fe 3 O 4 -C...mentioning

confidence: 99%

Lipase Immobilization over Hierarchically Carbonized Macro-MIL-88A for Biodiesel Production

Rahim,

Zou,

et al. 2024

ACS Appl. Nano Mater.

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“…Over the past few years, many groups including ours have reported a variety of man-made superhydrophobic/superoleophilic materials, which were used for coating, − catalytic synthesis, ,,− adsorption of organics and oil/water separation, etc. ,− Even so, to our knowledge, selective adsorption toward metal ions on such interface materials in aqueous systems has not been reported previously. This could be due to the surface of superhydrophobic/superoleophilic materials with low surface energy, which generally does not possess coordination groups for the chemical adsorption of metal ions because such groups are always hydrophilic. , However, the superhydrophobic/superoleophilic interface properties have still offered new inspiration to design an integrated multifunctional surface for tuning the selective adsorption processes, namely, to intentionally construct the inverted aqueous adsorbent, which can both effectively prevent nonselective physical adsorption of metal ions by virtue of its superhydrophobic barrier and favor the adsorption of organics on its superoleophilic interface, thereby improving the adsorption selectivity of metal ions and adsorption capacity of organics via chemisorption and physisorption in the cooperative manner controlled by functionalized interfaces in aqueous systems.…”

Section: Introductionmentioning

confidence: 96%

Selective Adsorbent Design with Multifunctional Surfaces: Innovating Solutions for Heterogeneous Catalysis in Water

Wang,

Liang,

Liu

et al. 2024

Langmuir

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Heterogeneous catalytic systems with water as the solvent often have the disadvantage of cross-contamination, while concerns about the purification and workup of the aqueous phase after reactions are rare in the lab or industry. In this context, designing and developing the functional selective solid adsorbent and revealing the adsorption mechanism can provide a new strategy and guidelines for constructing supported heterogeneous catalysts to address these issues. Herein, we report the stable composite adsorbent (Fe/ATP@PPy: magnetic Fe 3 O 4 /attapulgite with the polypyrrole shell) that features an integrated multifunctional surface, which can effectively tune the selective adsorption processes for Cu 2+ , Co 2+ , and Ni 2+ ions and nitrobenzene via the cooperative chemisorption/physisorption in an aqueous system. The adsorption experiments showed that Fe/ATP@PPy displayed significantly higher adsorption selectivity for Ni 2+ than Cu 2+ and Co 2+ ions, especially which exhibited an approximate 100.00% removal for both Ni 2+ ions and nitrobenzene in the mixture system with a low concentration. Furthermore, combined tracking adsorption of Ni 2+ ions and X-ray photoelectron spectroscopy characterization confirmed that the effective adsorption occurs via ion transfer coordination; the pathway was further validated at the molecular level through theoretical modeling. In addition, the selective adsorption mechanism was proposed based on the adsorption experiment, characterization, and the corresponding density functional theory calculation.

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“…Furthermore, a few studies have reported that hydrophobic materials show a poor mechanical durability due to their low adhesion between the coating and metal surface. Therefore, polydimethylsiloxane (PDMS) is commonly used as a binder to improve the adhesion strength given that PDMS is biocompatible, inexpensive, non-toxic, and has a good adhesion property on various surface materials 33 , 34 . It is important to note that the important key of this research is to design a hydrophobic coated SSM that can be used in a real situation if a crude oil spill occurs in seawater, and so to determine whether the designed materials can actually be used or not.…”

Section: Introductionmentioning

confidence: 99%

Modified silica-based double-layered hydrophobic-coated stainless steel mesh and its application for oil/seawater separation

Deachophon,

Bovornratanaraks,

Poompradub

2024

Sci Rep

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A double-layered hydrophobic-coated stainless steel mesh (CSSM) was successfully prepared by vapor deposition of polydimethylsiloxane (PDMS) to form aerosol silica (SiO2) particles on SSM followed by coating with the in situ modified SiO2 generated in the natural rubber (NR) latex for use in oil/seawater separation. The in situ SiO2 particles were modified with octyltriethoxysilane (OTES) or hexadecyltrimethoxysilane (HDTMS). Transmission electron microscopy, 29Si solid-state nuclear magnetic resonance, and Fourier transform infrared spectroscopy were used to determine the structure of the in situ modified SiO2 generated in the NR latex. Scanning electron microscopy and water contact angle analyses were applied to characterize the morphology and hydrophobicity of the CSSM, respectively. The presence of aerosol SiO2 particles from PDMS and in situ modified SiO2 by OTES (MSi-O) or HDTMS (MSi-H) generated in the NR could enhance the surface roughness and hydrophobicity of the CSSM. The hydrophobic CSSM was then applied for the separation of chloroform/seawater and crude oil/seawater mixtures. A high separation efficiency (up to 99.3%) with the PDMS/NR/MSi-H CSSM was obtained and the mesh was reusable for up to 20 cycles.

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Polydimethylsiloxane based sustainable hydrophobic/oleophilic coatings for oil/water separation: A review

Cited by 10 publications

References 71 publications

Lipase Immobilization over Hierarchically Carbonized Macro-MIL-88A for Biodiesel Production

Lipase Immobilization over Hierarchically Carbonized Macro-MIL-88A for Biodiesel Production

Selective Adsorbent Design with Multifunctional Surfaces: Innovating Solutions for Heterogeneous Catalysis in Water

Modified silica-based double-layered hydrophobic-coated stainless steel mesh and its application for oil/seawater separation

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