Hydrophobically modified chitin/halloysite nanotubes composite sponges for high efficiency oil-water separation

Zhao, Xiujuan; Luo, Yangyang; Tan, Peixin; Liu, Mingxian; Zhou, Changren

doi:10.1016/j.ijbiomac.2019.03.219

Cited by 66 publications

(22 citation statements)

References 62 publications

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“…Therefore, the modified aerogels allowed for the on-off switching of the oil–water mixture separation process. Zhao et al developed a composite sponge with chitin/halloysite nanotubes for oil–water separation [44]. After the introduction of lipophilic alkyls on the surface, the resultant sponge became hydrophobic and showed excellent absorption capability for various oils and organic solvents.…”

Section: Introductionmentioning

confidence: 99%

Complex Aerogels Generated from Nano-Polysaccharides and Its Derivatives for Oil–Water Separation

et al. 2019

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The complex aerogel generated from nano-polysaccharides, chitin nanocrystals (ChiNC) and TEMPO-oxidized cellulose nanofibers (TCNF), and its derivative cationic guar gum (CGG) is successfully prepared via a facile freeze-drying method with glutaraldehyde (GA) as cross-linkers. The complexation of ChiNC, TCNF, and CGG is shown to be helpful in creating a porous structure in the three-dimensional aerogel, which creates within the aerogel with large pore volume and excellent compressive properties. The ChiNC/TCNF/CGG aerogel is then modified with methyltrichlorosilane (MTCS) to obtain superhydrophobicity/superoleophilicity and used for oil–water separation. The successful modification is demonstrated through FTIR, XPS, and surface wettability studies. A water contact angle of 155° on the aerogel surface and 150° on the surface of the inside part of aerogel are obtained for the MTCS-modified ChiNC/TCNF/CGG aerogel, resulting in its effective absorption of corn oil and organic solvents (toluene, n-hexane, and trichloromethane) from both beneath and at the surface of water with excellent absorption capacity (i.e., 21.9 g/g for trichloromethane). More importantly, the modified aerogel can be used to continuously separate oil from water with the assistance of a vacuum setup and maintains a high absorption capacity after being used for 10 cycles. The as-prepared superhydrophobic/superoleophilic ChiNC/TCNF/CGG aerogel can be used as a promising absorbent material for the removal of oil from aqueous media.

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Section: Introductionmentioning

confidence: 99%

Complex Aerogels Generated from Nano-Polysaccharides and Its Derivatives for Oil–Water Separation

et al. 2019

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“…Their natural properties, high thermal stability, high surface area, biocompatibility, and fast adsorption rate, as well as environmentally friendliness, low cost, good dispersibility, and high stability in biological fluids make HNTs attractive materials in many fields. For example, in the cosmetic industry as additives, in the pharmaceutical industry as drug delivery vehicles, as packaging materials, for water decontamination, separation and purification, membrane for filtation, tissue engineering and many other biomedical uses and catalysis are some the fields of investigation for HNTs applications. Recently, filling materials with nanoclays including HNTs were utilized as coating for surface protection and for cleaning purposes due to the surfaces being easily modifiable to generate necessary functionalities .…”

Section: Introductionmentioning

confidence: 99%

Functionalization of halloysite nanotubes with polyethyleneimine and various ionic liquid forms with antimicrobial activity

Suner

Şahiner

Akçalı

et al. 2019

J of Applied Polymer Sci

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Halloysite nanotube (HNT), a natural clay, was modified with branched polyethyleneimine (PEI) to form PEI‐HNT using epichlorohydrin (ECH) as coupling agent, then protonated with HCl to obtain H‐PEI‐HNTs providing [NH3]+[Cl]− functionality for potential antimicrobial properties. Upon PEI modification, zeta potential value of HNTs was increased to +37.3 mV from −34.5 mV and to +41.1 mV for H‐PEI‐HNTs. Only 1.87 wt % H‐element in HNT was increased to 3.03 wt % upon PEI modification along with newly generated elements of N and C at 2.99 and 9.93 wt %, respectively. Moreover, ionic liquid (IL) forms of HNTs with [NH3]+[N(CN)2]−, [NH3]+[PF6]− and [NH3]+[BF4]− functionality were generated via anion exchange of H‐PEI‐HNTs with sodium dicyanamide (SDC), ammonium hexafluorophosphate (AHFP), and sodium tetrafluoroborate (STFB). The antimicrobial properties of the modified, protonated, and IL forms of HNTs were determined via macro dilution, diffusion and agar screening tests against Escherichia coli ATCC 8739, Pseudomonas aeruginosa ATCC 10145, Bacillus subtilis ATCC 6633, Staphylococcus aureus ATCC 6538 strains, and Candida albicans ATCC 10231 strains. It was found that H‐PEI‐HNTs possesses potent antimicrobial effect compared with the other forms of HNTs with 2–4 mg mL−1 MIC and 8–16 mg mL−1 MBC values via the macro dilution method. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48352.

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“…Zhao et al . prepared biodegradable modified chitin/hydroxyl nanotube composite sponge, which had high biocompatibility but unsatisfactory adsorption capacity (4–12 g g −1 ) . Chen et al .…”

Section: Introductionmentioning

confidence: 99%

Preparation and oil–water separation of 3D kapok fiber‐reduced graphene oxide aerogel

Luo

Tan

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Oil spills from oil tankers and ships or industrial accidents have serious impacts on the ecological environment.There is an urgent need for finding effective ways to resolve these problems. The use of low-cost and efficient adsorbents is considered to be one of the most effective ways. RESULTS: In this study, an ultra-light 3D kapok fiber-reduced graphene oxide (TKF-rGO) aerogel was prepared by a simple and green one-step hydrothermal method. The kapok fiber used as skeleton was embedded in a graphene network to successfully form a 3D aerogel structure. The as-prepared TKF-rGO aerogel featured low density, excellent mechanical strength, high thermal stability, and high hydrophobic lipophilicity. Furthermore, continuous oil-water separation could be achieved by the aerogel when connected to a vacuum system. The adsorption capacity of TKF-rGO aerogel for various common oil products and organic solvents was 1.5-fold greater than that of pure rGO aerogel and six-fold greater than that of polypropylene melt spray, respectively. In addition, the initial adsorption capacity of the as-prepared TKF-rGO aerogel was maintained at 94% after eight cycles.CONCLUSION: The TKF-rGO aerogel could be synthesized by a low-cost and green method, which was suitable for commercial production, and showed competitive adsorption capacities for oil removal. Thus, the TKF-rGO aerogel is expected to be employed as a promising adsorbent in the removal of oil spill or hazardous organic solvents from water.

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Hydrophobically modified chitin/halloysite nanotubes composite sponges for high efficiency oil-water separation

Cited by 66 publications

References 62 publications

Complex Aerogels Generated from Nano-Polysaccharides and Its Derivatives for Oil–Water Separation

Complex Aerogels Generated from Nano-Polysaccharides and Its Derivatives for Oil–Water Separation

Functionalization of halloysite nanotubes with polyethyleneimine and various ionic liquid forms with antimicrobial activity

Preparation and oil–water separation of 3D kapok fiber‐reduced graphene oxide aerogel

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