Preparation of hydrophobic reduced graphene oxide supported Ni-B-P-O and Co-B-P-O catalysts and their high hydrodeoxygenation activities

Wang, Weiyan; Liu, Pengli; Wu, Kui; Tan, Song; Li, Wensong; Yang, Yong

doi:10.1039/c5gc02073e

Cited by 29 publications

(15 citation statements)

References 60 publications

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“…Representing qt values versus time, while a linear pseudo-second-order plot was more suitable for collagen and BSA ( Figure 2 c), a nonlinear pseudo-second-order plot was fit for elastin adsorption ( Figure 2 d) [ 60 ]. Collagen showed a ten-fold higher adsorption rate constant (K 2 ) than BSA and elastin, indicating the highest affinity for rGO than elastin or BSA and due to the strong hydrophobic–hydrophobic interactions between rGO surface and collagen [ 61 ].…”

Section: Resultsmentioning

confidence: 99%

Modulation of Conductivity of Alginate Hydrogels Containing Reduced Graphene Oxide through the Addition of Proteins

et al. 2021

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Modifying hydrogels in order to enhance their conductivity is an exciting field with applications in cardio and neuro-regenerative medicine. Therefore, we have designed hybrid alginate hydrogels containing uncoated and protein-coated reduced graphene oxide (rGO). We specifically studied the adsorption of three different proteins, BSA, elastin, and collagen, and the outcomes when these protein-coated rGO nanocomposites are embedded within the hydrogels. Our results demonstrate that BSA, elastin, and collagen are adsorbed onto the rGO surface, through a non-spontaneous phenomenon that fits Langmuir and pseudo-second-order adsorption models. Protein-coated rGOs are able to preclude further adsorption of erythropoietin, but not insulin. Collagen showed better adsorption capacity than BSA and elastin due to its hydrophobic nature, although requiring more energy. Moreover, collagen-coated rGO hybrid alginate hydrogels showed an enhancement in conductivity, showing that it could be a promising conductive scaffold for regenerative medicine.

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Section: Resultsmentioning

confidence: 99%

Modulation of Conductivity of Alginate Hydrogels Containing Reduced Graphene Oxide through the Addition of Proteins

et al. 2021

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“…This finding suggested that the composite films had hydrophobicity. For the starter, CNT and Gr are both hydrophobic [32,33] and they are also nanomaterials. When CNT and Gr were used as the fillers, the matrices demonstrated great roughness, thereby reducing their surface energy and achieving a hydrophobic effect similar to that of lotus leaves.…”

Section: Functional Group Reaction Analysis By Ftirmentioning

confidence: 99%

Preparation of flexible, highly conductive polymer composite films based on double percolation structures and synergistic dispersion effect

Wang

et al. 2021

Polymer Composites

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We studied for the first time the synergistic dispersion effect of the carbon nanotube (CNT)/graphene (Gr) and polypropylene (PP)/polycarbonate (PC) (1:1) double percolation structures on conductive polymer composites (CPCs). PP/PC/CNT/Gr films with different CNT/Gr ratios are prepared by melt blending and hot pressing. Results showed that a CNT/Gr ratio of 1:1 facilitated the creation of co-continuous double percolation structures of matrices, and the electronic conductivity reached 33.11 S/m, which was five times greater than that of the matrices containing only CNT. Results showed that the synergistic dispersion effect and the co-continuous double percolation structures provided the matrices with conductivity through an additive effect. Meanwhile, PP/PC/CNT/Gr composite films possessed good thermal stability and hydrophobicity. They also did not exhibit thermal degradation at 300 C and had a water contact angle of 94.5 . However, PP and PC were incompatible, causing considerable brittleness of composite films macroscopically, and the films can hardly curve. To respond to this downside and improve the flexibility, a small amount of thermoplastic polyurethane (TPU) was added to the system. The presence of TPU helped combining the two materials in different phases, thereby strengthening the continuity. However, the presence of TPU adversely affected the double percolation structures and dispersion state of fillers, and subsequently decreased the conductivity.

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“…[11] To circumvent the problem of partial oxidationo fa ctive sites, it was demonstrated that water-sensitivea ctive sites could be protected against deactivation during HDO by adjustment of the catalyst's surface polarity. [12,13] Ta iloring the surface polarity has been demonstrated to exert as ignificant impact on the catalytic performancef or a varietyofreactions. [14] Notably,the adjustment of surface polarity can have ac rucial influence on activity and selectivityf or oxidation reactions of organic compounds using peroxides.…”

Section: Introductionmentioning

confidence: 99%

“…Traditional metal sulfide catalysts are known to suffer from deactivation during HDO in the presence of water by partial oxidation of the nickel sulfide phase . To circumvent the problem of partial oxidation of active sites, it was demonstrated that water‐sensitive active sites could be protected against deactivation during HDO by adjustment of the catalyst's surface polarity …”

Section: Introductionmentioning

confidence: 99%

Impact of Hydrophobic Organohybrid Silicas on the Stability of Ni₂P Catalyst Phase in the Hydrodeoxygenation of Biophenols

et al. 2018

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Hydrodeoxygenation (HDO) of lignocellulose‐derived pyrolysis oils offers an option to produce fuel substitutes. However, catalyst deactivation and stability constitute a significant issue. Herein, the dependence of stability and activity of Ni2P/SiO2 HDO catalysts on the support surface polarity is addressed in detail. The support surface polarity was adjusted by copolymerizing tetraethyl orthosilicate (TEOS) with different types and amounts of organosilanes by a sol–gel process in the presence of nickel nitrate and citric acid. After thermal treatment under an inert atmosphere, Ni/SiO2 precursors were formed. They were converted into Ni2P/SiO2 catalysts by using NaH2PO2 as a PH3 source. The catalyst surface polarity was characterized by inverse gas chromatography measurements of the free energy of methanol adsorption, and specific and dispersive surface energies derived from polar and nonpolar probe molecule adsorption. The correlation between catalyst performance and support surface polarity indicates that, to prevent deactivation of the catalyst by water under reaction conditions, the affinity of the support towards polar substances must be decreased below a threshold value.

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Preparation of hydrophobic reduced graphene oxide supported Ni-B-P-O and Co-B-P-O catalysts and their high hydrodeoxygenation activities

Abstract: Hydrophobic reduced graphene oxide supported Ni-B-P-O and Co-B-P-O catalysts were beneficial to disperse in the non-polar solvent, prevent the contact with water, and consequently protected the active phases and exhibited high catalytic activity in the liquid-phase p-cresol HDO reaction.

Cited by 29 publications

References 60 publications

Modulation of Conductivity of Alginate Hydrogels Containing Reduced Graphene Oxide through the Addition of Proteins

Modulation of Conductivity of Alginate Hydrogels Containing Reduced Graphene Oxide through the Addition of Proteins

Preparation of flexible, highly conductive polymer composite films based on double percolation structures and synergistic dispersion effect

Impact of Hydrophobic Organohybrid Silicas on the Stability of Ni₂P Catalyst Phase in the Hydrodeoxygenation of Biophenols

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Preparation of hydrophobic reduced graphene oxide supported Ni-B-P-O and Co-B-P-O catalysts and their high hydrodeoxygenation activities

Abstract: Hydrophobic reduced graphene oxide supported Ni-B-P-O and Co-B-P-O catalysts were beneficial to disperse in the non-polar solvent, prevent the contact with water, and consequently protected the active phases and exhibited high catalytic activity in the liquid-phase p-cresol HDO reaction.

Cited by 29 publications

References 60 publications

Modulation of Conductivity of Alginate Hydrogels Containing Reduced Graphene Oxide through the Addition of Proteins

Modulation of Conductivity of Alginate Hydrogels Containing Reduced Graphene Oxide through the Addition of Proteins

Preparation of flexible, highly conductive polymer composite films based on double percolation structures and synergistic dispersion effect

Impact of Hydrophobic Organohybrid Silicas on the Stability of Ni2P Catalyst Phase in the Hydrodeoxygenation of Biophenols

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Impact of Hydrophobic Organohybrid Silicas on the Stability of Ni₂P Catalyst Phase in the Hydrodeoxygenation of Biophenols