Ag/polydopamine-coated textile for enhanced liquid/liquid mixtures separation and dye removal

Miao, Gan; Li, Fangchao; Gao, Zhongshuai; Xu, Ting; Miao, Xiao; Ren, Guina; Song, Yali; Li, Xiangming; Zhu, Xiaotao

doi:10.1016/j.isci.2022.104213

Cited by 23 publications

(3 citation statements)

References 74 publications

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“…Depending on the material structure, the C, O and N elements mainly came from PDA, and Ag element was related to Ag. There were five peaks in the C 1s spectrum, consisting of C-C (284.8 eV), C-O (285.6 eV), C-N (286.5 eV), C=O (287.1 eV) and O-C=O (288.8 eV) [30,39,40]. In the N 1s spectrum, there existed -NH 2 (397.9 eV), -NH-(399.3 eV) and -N= (401.6 eV), which were totally in line with the theoretical values [23,41].…”

Section: Different Friction Pairsmentioning

confidence: 99%

Tribological Properties of Polydopamine-Modified Ag as Lubricant Oil Additives

Zhang

Cheng

et al. 2022

Lubricants

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Nanoparticles agglomerate easily because of their high surface energy, which seriously reduces their tribological properties as lubricant additives. In this work, the core-shell nanoparticles Ag@polydopamine (PDA) were successfully prepared by the self-oxidation of dopamine hydrochloride on the surface of Ag nanoparticles and the dispersion of Ag nanoparticles in PAO6 was improved to promote anti-wear behaviors. The tribological properties of Ag@PDA nanocomposites as additives in poly alpha olefin (PAO) oil were studied under different concentrations, pressure and speed conditions by UMT-5 tribometer. It was demonstrated that the strong electrostatic repulsion of the PDA structure made the Ag nanoparticles better dispersed in PAO oil, thus playing a better lubricating role. When the concentration of the modified nanoparticles was 0.25 wt%, the friction coefficient of the lubricating oil decreased by 18.67% and no obvious wear was observed on the friction pair surface. When the Ag@PDA content was higher than 0.25 wt%, the tribological performance of the lubricating oil was weakened, which may be due to excessive Ag@PDA acting as an abrasive on the friction surface, thereby increasing friction and wear. The friction coefficient of the lubricating oil containing Ag@PDA decreased with the increase in load, but hardly changed with the increase in frequency.

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Section: Different Friction Pairsmentioning

confidence: 99%

Tribological Properties of Polydopamine-Modified Ag as Lubricant Oil Additives

Zhang

Cheng

et al. 2022

Lubricants

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“…Dopamine, a bioinspired compound derived from mussels, is renowned for its ability to bind a wide variety of materials through the formation of layers rich in functional groups. This characteristic has spurred extensive exploration of dopamine for surface modification of materials. − Additionally, the presence of catechol and amine groups makes dopamine an effective adsorbent for organic and inorganic chemicals. In this work, we present the fabrication of a polydopamine (PD)-wrapped CuO (PD/CuO) nanowire-haired membrane.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Polydopamine-Modified CuO Nanowire-Haired Membranes for Efficient Oil/Water Separation and Dye Removal

Zhang,

Zhao,

Zhu

et al. 2024

Ind. Eng. Chem. Res.

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Utilizing the synergistic effect of polydopamine (PD) with functional multigroups and nanowire-haired mesh membrane with a hierarchical structure and high surface area, we designed and fabricated a novel bioinspired PD-wrapped CuO nanowire-haired mesh membrane. The PD ultrathin layer on Cu(OH) 2 nanowires, with a thickness ranging from 5 nm to 15 nm, was through controllable self-polymerization of dopamine via catechol chemistry. Successful conversion of Cu(OH) 2 to CuO nanowires was achieved through an in situ dehydration process by thermal treatment at 160 °C. The as-prepared PD/CuO nanowirehaired mesh membrane exhibited superhydrophilicity and underwater superoleophobicity, demonstrating high oil/water separation efficiency toward various oils with residual oil content of <20 ppm through solely gravity-driven processes. Moreover, the introduction of a PD ultrathin layer on nanowires endowed the PD/CuO nanowire-haired membrane with improved adsorption properties for dyes containing Eschenmoster structures, showing adsorption values almost four times higher than those of the original Cu(OH) 2 nanowires-haired membrane without PD wrapping. Our results suggest that the method, combining hierarchical surface structure and functional ultrathin layer, could integrate both oil/water separation and hazardous material adsorption processes for potential wastewater treatment applications.

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“…With the increase of human daily life, industrial processes, and unintentional leaks of crude oil and petrochemical compounds, the release of oil/water pollutants has dramatically resulted in substantial environmental harm and financial losses. , Membrane filtration has been considered as one of the most competitive strategies for the separation of oil/water mixtures, especially highly emulsified surfactant-stabilized emulsions, due to the high separation efficiency and simple operation process. − To improve separation efficiency, filtration membranes are usually treated to have opposite wettability to water and oil. − Since the surface tension of water is much higher than that of oils, it is relatively easy to prepare membranes that are nonwettable to water but wettable to oils (i.e., hydrophobic–oleophilic). − These membranes have the ability to intercept water droplets from the oil flow due to the hydrophobic–oleophilic wettability. For these membranes, however, there exists an issue of oil fouling (especially for oils with high viscosity), which may lead to a severe decline in flux during operation.…”

Section: Introductionmentioning

confidence: 99%

Under-Oil Superhydrophilic/Superhydrophobic Janus Nanofibrous Membrane for Highly Efficient Separation of Surfactant-Stabilized Water-in-Oil Emulsions

Guo,

Chi,

Wei

et al. 2023

Langmuir

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Highly efficient separation of surfactant-stabilized water-in-oil emulsions with both a high separation efficiency and high permeation flux is still challenging. In this work, an under-oil superhydrophilic/superhydrophobic Janus membrane was fabricated by combining an electrospun poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) membrane and its modified membrane composited with poly(ethylene glycol) diacrylate (PEGDA). The incorporation of PEGDA is realized by in situ ultraviolet (UV)-initiated polymerization during the electrospinning process, and it endows the upper layer with unique under-oil superhydrophilicity that is very important for the demulsification of water-in-oil emulsions. The under-oil superhydrophobic lower layer serves to block the water and also can promote the permeation flux, because of its oil-absorbing ability. For surfactant-stabilized water-in-n-hexane emulsion (water content of 1 wt %), such a Janus membrane exhibits outstanding separation performance with a separation efficiency of >99.95% and permeation flux of >25 000 L m −2 h −1 . Moreover, the Janus membrane shows excellent reusability and high applicability for water-in-diesel, water-in-hexadecane, and water-in-petroleum ether emulsions with separation efficiencies of 99.63%, 99.80% and 99.82%, respectively. These features make the Janus membrane a promising candidate as a separation membrane for surfactant-stabilized water-in-oil emulsions.

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Ag/polydopamine-coated textile for enhanced liquid/liquid mixtures separation and dye removal

Cited by 23 publications

References 74 publications

Tribological Properties of Polydopamine-Modified Ag as Lubricant Oil Additives

Tribological Properties of Polydopamine-Modified Ag as Lubricant Oil Additives

Multifunctional Polydopamine-Modified CuO Nanowire-Haired Membranes for Efficient Oil/Water Separation and Dye Removal

Under-Oil Superhydrophilic/Superhydrophobic Janus Nanofibrous Membrane for Highly Efficient Separation of Surfactant-Stabilized Water-in-Oil Emulsions

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