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•The durable superhydrophobic composite surfaces can be obtained by a simple and cost-effective two-steps spraying method.•The multi-adhesive strategy can improve the adhesion between ...the composite coating and the substrate and the composite coating itself, thereby improving the mechanical stability of the surface.•The prepared superhydrophobic surface has excellent temperature resistance, corrosion resistance and chemical stability.•The prepared surface shows excellent performance in practical applications such as self-cleaning, anti-icing and anti-frosting.
Poor mechanical stability, expensive cost, and complex preparation process still limit the practical application of artificial superhydrophobic surfaces. Improving the chemical durability and mechanical stability of superhydrophobic surfaces is an important research direction to promote its commercial application. Herein, we developed a cost-effective and simple method to produce a durable superhydrophobic surface based on a multi-adhesive strategy. Fluorocarbon resin and hydrophobic silica nanoparticles bring excellent hydrophobicity and low adhesion to the coating. And the introduction of bottom resin and phenolic amine adhesive can not only increase the adhesion between superhydrophobic coating and substrates but also increase the mechanical stability of the coating. Even after severe mechanical damage such as abrasion, rubbing, and scraping, the prepared surface can still maintain excellent superhydrophobicity. At the same time, stable resin and inorganic filler bring more than 99 % anticorrosion efficiency, excellent thermal stability, and chemical stability to the superhydrophobic surface. The outstanding performance of the superhydrophobic surfaces in the field of self-cleaning, anti-icing, and frost protection may attract attention for practical application in the industry. The convenience of surface preparation on various substrates by spraying and brushing methods, and the low cost of manufacturing can also greatly expand the application prospect of the developed superhydrophobic surface.
A rapid and sensitive method has been developed for the simultaneous determination of 50 veterinary drugs (including macrolides, quinolones, sulfonamides, and tetracyclines) in cheese using a ...modified QuEChERS method coupled with liquid chromatography-tandem mass spectrometry (LC-MS/MS). After adding Na2EDTA buffer solution and ceramic homogenizer, the cheese sample was extracted by 5% (v/v) acetic acid-acetonitrile, sodium chloride and anhydrous sodium sulfate were used for salting-out process. The resulting supernatant solution was purified by C18 sorbent and the re-dissolved solution was analyzed by LC-MS/MS under dynamic multi-reaction monitoring (dynamic MRM) mode via positive electrospray ionization with a ZORBAX-SB-C18 column. The limits of quantification (LOQ, S/N= 10) of the target compounds ranged from 0. 05 µg/kg to 20 µg/kg in cheese. At spiked levels of 20, 50, 100 µg/kg (n =6) , the percentages of drug with a recovery between 70% and 120% were 94%, 92%, and 96%, respectively. The relative standa
The construction of efficient semiconductor/cocatalyst heterojunction is a promising strategy to promote the photocatalytic H2-production efficiency from water reduction. Herein, a novel ...Cu2(OH)2CO3/Zn0.5Cd0.5S heterojunction composite with superior photocatalytic H2-generation activity and stability was prepared via a facile in situ synthetic route, in which Cu2(OH)2CO3 served as cocatalyst stimulating the photocatalytic H2-evolution performance of Zn0.5Cd0.5S. The Cu2(OH)2CO3/Zn0.5Cd0.5S heterojunction photocatalyst containing 5 wt% of Cu2(OH)2CO3 exhibited a prominent H2-evolution efficiency of 275.7 μmol h−1, which is superior to the noble metal Pt-modified Zn0.5Cd0.5S photocatalyst (237.3 μmol h−1) and much higher than bare Zn0.5Cd0.5S (90.8 μmol h−1). The active Cu+/Cu0 species generated during the photoreaction process is responsible for the prominent H2-production activity of the heterojunction photocatalyst, which plays triple roles in enhancing the photoactivity of Zn0.5Cd0.5S via accelerating the charge separation, decreasing the overpotential of H2-generation and improving the reduction ability of photoinduced electrons. Moreover, the formed Cu+/Cu0 species during photoreaction can be readily oxidized back to Cu2(OH)2CO3 upon exposure to air, thus restores the photoactivity and therefore enables good reusability of the Cu2(OH)2CO3/Zn0.5Cd0.5S heterojunction photocatalysts. This work provides a new insight into the fabrication of Cu2(OH)2CO3-assisted heterojunction photocatalysts with the highly stable and efficient performances for solar-to-chemical energy conversion.
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•A novel binary Cu2(OH)2CO3/Zn0.5Cd0.5S composite was successfully synthesized.•The trifunctional roles of Cu2(OH)2CO3 cocatalyst were discussed.•Mechanism of the enhanced photocatalytic activity was illuminated.
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•Novel magnetic Bi2O2CO3/ZnFe2O4 photocatalysts was synthesized by hydrothermal route.•The enhanced photocatalytic performance of Bi2O2CO3/ZnFe2O4 was investigated.•Z-scheme reaction ...mechanism was proposed for the enhanced photoactivity.
Magnetic Bi2O2CO3/ZnFe2O4 heterojunction photocatalysts with varying content of ZnFe2O4 were constructed by modifying Bi2O2CO3 nanosheets with mesoporous ZnFe2O4 nanoparticles. The photoactivity of the products was investigated by decomposing RhodamineB (RhB) and it was found that the photoactivity of Bi2O2CO3/ZnFe2O4 composite was closely related to the loading amount of ZnFe2O4. Under simulant sunlight irradiation, the optimum photoactivity of Bi2O2CO3/ZnFe2O4 composite was almost 2.3 and 2.1 times higher than that by bare ZnFe2O4 and Bi2O2CO3, respectively. The improved photoactivity resulted from the synergistic effect of Bi2O2CO3 and ZnFe2O4, which not only extended the photoabsorption region but also significantly facilitated the interfacial charge transfer. Besides the high photocatalytic performance, Bi2O2CO3/ZnFe2O4 composite also exhibited excellent stable and recycling properties, which enabled it have great potential in a long-term practical use.
Considering the cleanness and renewability of the solar H2-production system, photocatalytic H2-production from water splitting with the assistance of nonprecious and Earth-abundant cocatalysts has ...become a research hotspot. Herein, robust Cu2(OH)2CO3 nanoparticles were successfully anchored onto the surface of g-C3N4 nanosheets through a mild precipitation route in which Cu2(OH)2CO3 serves as an effectively nonprecious metal-based cocatalyst for boosting hydrogen generation. The results demonstrated that the as-prepared hybrid Cu2(OH)2CO3/g-C3N4 nanocomposite photocatalyst with an optimum 3 wt% loading amount of Cu2(OH)2CO3 exhibited a noticeable improvement of photocatalytic H2-evolution performance under visible light illumination. The boosted H2-evolution activity was associated with the formation of active Cu species during the photocatalytic process, which could promote the interfacial charge separation and simultaneously reduce the overpotential of hydrogen generation, thus boosting the H2-evolution activity over the hybrid photocatalyst. More importantly, by introducing an optimum amount of fluorescein dye molecules into the photocatalytic system, the maximum photocatalytic H2-production rate over the binary Cu2(OH)2CO3/g-C3N4 photocatalyst could be further improved to be 22.6 μmol h-1, 19.3 and 3.8 times higher than those of pristine g-C3N4 and the corresponding binary catalyst without the assistance of fluorescein. These results could be ascribed to the positively cooperative effects of Cu2(OH)2CO3, fluorescein dye molecules and g-C3N4, which lead to the increasing light absorption ability, fast charge mobility and efficient charge separation of the fluorescein-sensitized Cu2(OH)2CO3/g-C3N4 hybrid photocatalyst, thus ultimately boosting the photocatalytic H2-production activity. This study may pave a new way for engineering a low-cost, high-efficiency, noble-metal-free and dye-sensitized cocatalyst/semiconductor system for solar-to-fuel conversion.
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•Solvent-free one-step green synthesis of ionic liquid-based polymer electrolytes.•The polymer electrolytes show excellent non-flammable and mechanical properties.•Ionic liquid-based ...polymer electrolyte films with rapid self-healing ability.
Fire-resistant and self-healing flexible electrolytes are a promising alternative to address thermal runaway in lithium batteries. However, self-healing electrolytes for lithium batteries are not widely used due to their low ionic conductivity, limited self-healing ability, and potential combustion risk. Ionic liquid-based polymer electrolytes are a simple and effective approach to obtaining polymer solid electrolytes with high ionic conductivity, fast self-healing and flame retardant properties. In this work, methyl methacrylate (MMA) and 1-Allyl-3-methylimidazolium Bis(trifluoromethanesulfonyl)imide (AMIMTFSI) are used as the membrane-forming backbone and also possess ion transport channels. 1-ethyl-3 methylimidazolium bis(trifluoromethyl)sulfonylimide (EMIMTFSI) is added to the membrane to further enhance the ionic conductivity. Due to the existence of ionic liquid units and free ionic liquids in the prepared electrolytes, the fast interaction of ionic bonds confers a faster self-healing ability to the films, and the flame retardancy of the ionic liquids is fully maintained after polymerization. The prepared electrolytes show good flame retardance properties, excellent mechanical properties (tensile rate is ∼ 400%), high thermal decomposition temperature (>260 °C), and can effectively enhance the reliability of lithium metal batteries. When ionic liquids filler mass fraction is 40%, the polymer electrolytes have an ionic conductivity of 1.9 × 10-4 S cm−1, a decomposition voltage of 4.6 V (vs. Li/Li+), and can achieve an initial discharge capacity of 134.9 mAh g−1 with a capacity retention of 96.4% after 90 cycles at 0.1C for LiFePO4/Li half-cell at 25 °C.
•A new ternary Zn0.5Cd0.5S/g-C3N4/RGO composite was successfully synthesized.•The synergetic effects of g-C3N4 and RGO on the photoactivities were discussed.•Mechanism of the enhanced photocatalytic ...activity was illuminated.
In this work, a novel ternary composite photocatalytic material was constructed by in-situ deposition of 0D Zn0.5Cd0.5S nanoparticles onto the 2D g-C3N4 and reduced graphene oxide (RGO) surfaces via a simple one-pot hydrothermal reaction. Through optimizing of the g-C3N4 component proportion, Zn0.5Cd0.5S heterostructure decorated with 3 wt% g-C3N4 nanosheets (Zn0.5Cd0.5S/g-C3N4) displayed a high H2-production rate of 4.956 mmol g−1h−1, which was 2.73 times higher than that of pure Zn0.5Cd0.5S nanoparticles. Additionally, when 1 wt% RGO was further introduced to the binary Zn0.5Cd0.5S/g-C3N4 heterostructure, the obtained ternary Zn0.5Cd0.5S (0D)/g-C3N4 (2D)/RGO (2D) composite catalyst exhibited the highest photocatalytic H2-production activity, whose H2-production rate was 5.41 times higher than that of pure Zn0.5Cd0.5S nanoparticles. The excellent activity of the ternary Zn0.5Cd0.5S/g-C3N4/RGO catalyst is associated with the cooperative effects of Zn0.5Cd0.5S nanoparticles, RGO and g-C3N4 nanosheets, which not only extend the light absorption range and intensity, but also reduce the overpotential for H2-production and dramatically improve the charge mobility and separation, thus boosting the H2-evolution rate over the ternary composite photocatalyst.
To conquer the disadvantage of low photocatalytic efficiency resulted from narrow photoresponse range and electron-hole recombination, a 2D nanoplate-like MoS2/Bi2WO6 heterojunction photocatalyst was ...designed and prepared by a facile two-step hydrothermal technique. Compared with pure Bi2WO6, the MoS2/ Bi2WO6 composite displayed an enhanced photoabsorption in the whole visible light region. Through the photodegradation of rhodamine B (RhB) under visible light irradiation (λ>400nm), the photocatalytic activities of the obtained products were evaluated and the MoS2/Bi2WO6 composite exhibited higher photocatalytic performance than that of pure Bi2WO6. The enhanced photocatalytic performance was attributed to the broad photoabsorption and low charge recombination driven by the photogenerated potential difference formed at the MoS2/Bi2WO6 heterojunction interface.
•2D nanoplate-like MoS2/Bi2WO6 composite was synthesized by hydrothermal method.•The enhanced photoactivity of MoS2/Bi2WO6 was systematically investigated.•A possible mechanism for the enhanced photoactivity was proposed.
Superhydrophobic surfaces are widely used in industry and daily life, yet their practical application is limited by their complicated preparation process, high cost, and poor repairability. We ...propose a low-cost, facile process for preparing superhydrophobic surfaces to address this limitation. Through a simple three-step spraying process, the rough structure was first constructed on the aluminum alloy, and upon modification by modifier, the superhydrophobic aluminum alloy surface was successfully prepared. The effect of the process parameters on wettability was experimentally studied. The results showed that this method can obtain superhydrophobic surfaces with a contact angle of 156.2° and contact angle hysteresis of 7.4° by simply adjusting the etching time and modifier concentration. In addition, it was found that the prepared surface can keep the superhydrophobic property unchanged at 180 °C, showing good thermal stability. When immersed in acetic acid and sodium hydroxide solution, the prepared surface can maintain its superhydrophobicity for about 2 days, showing good chemical stability. Besides, the surface has excellent repairability and can compensate for the short-life defects caused by poor friction resistance. This superhydrophobic surface with a simple preparation process, low cost, and excellent repairable characteristics also has excellent self-cleaning, antifogging, and antifrosting applications.
