PROGRESS IN ORGANIC COATINGS
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2022
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IF 6.206
Shan Wan,Huikai Chen,Guangyi Cai,Bokai Liao,Xingpeng Guo
The amino-functionalized carbon dots (FCDs) were used as intercalators to exfoliate and modify the boron nitride for obtaining the FCDs/boron nitride nanosheets (BNNS) nanocomposite . The FCDs, BNNS and FCDs/BNNS were respectively dispersed into the waterborne epoxy (WEP) matrix to prepare the corresponding modified WEP coatings on the copper substrate through the spray coating method. Their micro/macro-morphologies, compositions, surface roughness , self-healing and corrosion resistance behaviors were comparatively researched. Electrochemical results and surface morphology observation show that WEP FCDs/BNNS coating possesses the optimal corrosion protection performance after 40 d immersion in 3.5 wt% NaCl solution. And the impedance value (4.97 × 10 5 Ω cm 2 ) of WEP FCDs/BNNS coating is still about an order of magnitude higher than that of pure WEP coating (3.36 × 10 4 Ω cm 2 ). In the WEP FCDs/BNNS coating system, BNNS as physical barrier extend the diffusion path of corrosive species and block inherent defects of the coating, thus slowing down the corrosion rate; FCDs as intercalators strip BNNS enhancing its physical barrier effect. Besides, FCDs can also act as the effective corrosion inhibitors , which could adsorb on the exposed or corroded copper surface and hinder the further corrosion. Their synergistic effects of physical barrier performance from BNNS and self-healing capability from FCDs endow the WEP composite coating with outstanding corrosion resistance.
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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Mingxuan Fan,Wenxiu Jiang,Lingqian Tang,Mengqi Zhao,Qingrong Cheng,Lu Feng,Hanjun Wu,Zhiquan Pan,Hong Zhou
From the perspective of full utilization of biomass, a clean approach for the production of diosgenin from total saponins in Dioscorea zingiberensis C.H. Wright (DZW) was realized by preliminary separation and extraction. An alcoholysis approach was adopted to obtain diosgenin using a novel magnetic solid acid Fe 3 O 4 @SiO 2 -Pr-S-Pr-SO 3 H Pr = -(CH 2 ) 3 -) as the catalyst. The prepared solid acid has been fully characterized. The single factor methodology was used to optimize the process parameters. The optimum conditions were: 0.50 g Fe 3 O 4 @SiO 2 -Pr-S-Pr-SO 3 H, 6.0 mL ethanol, the reaction temperature 120 ℃, reaction time 7.0 h and the maximum yield of diosgenin was 24.18% which are higher than conventional hydrolysis with 1.5 M sulfuric acid indicating the high catalytic activity of the solid acids. In addition, the solid acid had good reusability. The LC-MS technique was applied to analyze the main steroidal saponins in total saponins and possible mechanisms and pathways of hydrolysis and alcoholysis processes. Alcoholysis by an as-prepared magnetic solid acid is clearly excellent in high efficiency and reusability. It is a promising strategy for the green production of diosgenin through a cleaner approach.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2021
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IF 6.789
Huajing Zhou,Dongxiu Lu,Shangquan Fang,Chang Liu,Yuancai Chen,Yongyou Hu,Qijin Luo
A novel heteroatomic N, P and S co-doped core-shell material (MnFe 3 O 4 @PZS) was synthesized by a simple polycondensation hydro-thermal method, and used as the cathode to cooperate with electron-catalysis to activate persulfate (S 2 O 8 2− ) (E-MnFe 3 O 4 @PZS-PDS) for tetracycline (TTC) degradation. Radical scavenger studies demonstrated that non-radicals including atomic H* and singlet oxygen ( 1 O 2 ) rather than sulfate and hydroxyl radicals were the crucial reactive oxygen species (ROS). Electrochemical analysis indicated that Mn doping could promote electro-catalytic process via diverting pathway from four/two-electron to one-electron to generate non-radical H*/ 1 O 2 at the cathode, including one-electron oxygen reduction reaction (1e-ORR) ( O 2 → 1 O 2 ), and one-electron hydrogen reduction reaction (1e-HRR) ( H 2 O + e − → H ∗ ) , as evidenced by the lowest onset potential (0.072 V) together with electron transfer number (n = 1.65). Besides, the regeneration/reduction of Fe Ⅱ/Ⅲ /Mn Ⅱ/Ⅲ/Ⅳ and persulfate will not cause excessive consumption of electron and chemicals due to that could directly get the electron individually from the cathode and anode , and finally TTC could be completely degraded with low energy consumption (0.655 kWh m −3 ). This study provides new insights into the direct single electron activating PDS to produce non-radical H*/ 1 O 2 via core-shell catalytic MnFe 3 O 4 @PZS, and displays a promising application in wastewater treatment .
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 18
·8045-8053
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IF 3.591
Yaping Zhang,Daofei Lv,Jiayu Chen,Zewei Liu,Chongxiong Duan,Xin Chen,Wenbing Yuan,Hongxia Xi,Qibin Xia
The separation of ethylene/ethane mixtures using energy-efficient technologies is important but challenging. In this study, we prepared a Zr-based metal–organic framework (MOF-545) possessing a high Brunauer–Emmett–Teller (BET) surface area of 2265.4 m2 g−1, and investigated its adsorption performance for ethylene/ethane separation. Isotherm measurements show that MOF-545 exhibits preferential adsorption of ethane over ethylene. The mechanism underlying the selective adsorption of ethane over ethylene was revealed by the calculations of preferential adsorption sites, interaction energies and adsorption density distributions of ethane and ethylene in MOF-545 via the Metropolis Monte Carlo method. Results show that the strong C–H⋯N hydrogen bonding between ethane molecules and porphyrin rings gives rise to the selective adsorption of ethane over ethylene. Thermal, air and cycling stability tests, adsorption selectivity and adsorption enthalpy calculations, and breakthrough experiments comprehensively validate the potential of MOF-545 as an efficient ethane-selective adsorbent for ethane/ethylene separation.
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Chemistry-An Asian Journal
·
2020
·Vol. 15
·期 8
·1315-1323
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IF 4.056
Xin Zhang,Yanfang Gao
Graphical A 2D/2D hexagonal boron nitride (h-BN) and nitride doped molybdenum disulfide (N−MoS 2 ) heterostructure (h-BN/N−MoS 2 ) catalyst was prepared by sonication using a solvothermal method. The catalyst breaks down H 2 O 2 to produce hydroxyl radical and further oxidizes the colorless TMB to produce blue oxTMB. Recently, nanozymes have attracted extensive attention because of their advantages of combining nanomaterials with enzymes. Herein, hexagonal boron nitride (h-BN) and nitride-doped molybdenum disulfide (N−MoS 2 ) nano-composites (h-BN/N−MoS 2 ) were synthesized by facile and cost-effective liquid exfoliation with a solvothermal method in nontoxic ethanol solution. The results show that h-BN, as a co-catalyst, can not only dope into the lattice of MoS 2 but also form a heterogeneous structure with MoS 2 NSs. It expanded the layer spacing and specific surface area of MoS 2 NSs, which was beneficial to the contact between the catalyst and the substrate, and resulted in a synergistic enhancement of the catalytic activity of hydrogen peroxide (H 2 O 2 ) with MoS 2 . A colorimetric determination platform of h-BN/N−MoS 2 -TMB-H 2 O 2 was constructed. It exhibited a wide linear range of 1–1000 μM with a low limit of detection (LOD) of 0.4 μM under optimal conditions, high sensitivity and stability, as well as good reliability (99.4–110.0%) in practice, making the measurement system more widely applicable.1. Introduction
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International Journal of Minerals Metallurgy and Materials
·
2020
·Vol. 27
·期 2
·220-231
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IF 1.713
Yang Tao,Liu Hui-juan,Bai Fan,Wang En-hui,Chen Jun-hong,Chou Kuo-Chih,Hou Xin-mei
Currently, developing supercapacitors with robust cycle stability and suitability for wide-temperature-range operations is still a huge challenge. In the present work, few-layer hexagonal boron nitride nanosheets (h-BNNSs) with a thickness of 2–4 atomic layers were fabricated via vacuum freeze-drying and nitridation. Then, the h-BNNSs/reduced graphene oxide (rGO) composite were further prepared using a hydrothermal method. Due to the combination of two two-dimensional (2D) van der Waals-bonded materials, the as-prepared h-BNNSs/rGO electrode exhibited robustness to wide-temperature-range operations from −10 to 50°C. When the electrodes worked in a neutral aqueous electrolyte (1 M Na 2 SO 4 ), they showed a great stable cycling performance with almost 107% reservation of the initial capacitance at 0°C and 111% at 50°C for 5000 charge—discharge cycles.
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Corrosion Communications
·
2026
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IF 10.7
Jie Yang,Wenhui Yao,Daizhi Chen,Xin Li,Jiaming Yan,Liang Wu,Young-Rae Cho,Xianhua Chen
A novel nanofiller-reinforced SLIPS is developed on AZ31 Mg alloys. • CeO 2 @PDA/h-BN nanofillers enhance the corrosion resistance and self-healing properties of coatings. • Self-healing ability is due to rapid lubricant redistribution and passive film formation. • The coating shows better long-term corrosion protection than conventional SLIPSs. Conventional slippery liquid-infused porous surfaces (SLIPSs) have emerged as an effective strategy to protect Mg alloys from corrosion. However, their anti-corrosion and self-healing performances remain insufficient for long-term service. Therefore, multifunctional CeO 2 @PDA/h-BN nanofillers were incorporated into liquid lubricant to fabricate nanofiller-reinforced SLIPSs (CeO 2 @PDA/h-BN-SLIPSs). In particular, this study systematically investigated influences of nanofiller concentrations on surface morphology, hydrophobicity, and electrochemical behavior. CeO 2 @PDA/h-BN-SLIPS-8, prepared at a concentration of 8 mg/mL, displayed the lowest corrosion current density (8.22 × 10 -11 A/cm 2 ) and the highest impedance modulus (9.06 × 10 8 Ω cm 2 at 0.01 Hz). This was ascribed to the synergistic effects of high surface hydrophobicity provided by a lubricant layer, tortuous diffusion pathways provided by h-BN nanosheets, ion-exchange property of MgAl-LDH, and active corrosion inhibition of CeO 2 . In addition, scanning vibration electrode technique (SVET) analysis confirmed good self-healing behavior of CeO 2 @PDA/h-BN-SLIPS-8, arising from both rapid lubricant redistribution and formation of protective cerium-based passive films. Overall, this study provides an effective strategy for fabrication of robust anti-corrosive and self-healing SLIPSs, offering enhanced corrosion protection for Mg alloys in industry.
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JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Ying Liao,Yue Pan,Xiang Feng,Xiaobo Chen,Yibin Liu,Chaohe Yang,Hao Yan
Designing efficient active sites to facilitate the oxidation of hydroxyl group to carboxylic acid under the influence of nitrogen-containing functional groups is worth exploring, but it is rarely investigated. Herein, we construct defective Au-ZrO 2 interfacial structures by tuning the calcination temperature of ZrO 2 support to boost the oxidation of amino alcohols to amino acids. Interestingly, the modification of calcination temperature induces the escape of saturated coordination oxygen atoms in ZrO 2 support, leaving behind abundant surface oxygen vacancy (O v ). The as-formed Au δ− -O v interfacial site displays the unique synergistic adsorption effect and electron transfer ability. Specifically, the O v site voluntarily adsorbs the –NH 2 group of amino alcohol, thus ensuring that the electron-rich Au δ− nearby O v site adsorbs the hydroxyl groups and activates the C-H bond activation of NH 2 CH 2 CH 2 O* intermediates. Consequently, Au/ZrO 2 -600 catalyst with more defective Au δ− -O v interfacial sites exhibits 98.8 % product yield for the oxidation of diethanolamine to iminodiacetic acid at only 30 °C. The catalyst system is further extended to the oxidation of other amino alcohols, involving monoethanolamine and triethanolamine, to their corresponding amino acids with excellent catalytic performance.
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ACS Nano
·
2023
·
IF 17.1
Yingying Niu,Xin Zhou,Wei Gao,Maixia Fu,Yule Duan,Jiandong Yao,Bing Wang,Mengmeng Yang,Zhaoqiang Zheng,Jingbo Li
Driven by the rapid development of autonomous vehicles, ultrasensitive photodetectors with high signal-to-noise ratio and ultraweak light detection capability are urgently needed. Due to its intriguing attributes, the emerging van der Waals material, indium selenide (In2Se3), has attracted extensive attention as an ultrasensitive photoactive material. However, the lack of an effective photoconductive gain mechanism in individual In2Se3 inhibits its further application. Herein, we propose a heterostructure photodetector consisting of an In2Se3 photoactive channel, a hexagonal boron nitride (h-BN) passivation layer, and a CsPb(Br/I)3 quantum dot gain layer. This device manifests a signal-to-noise ratio of 2 × 106 with responsivity of 2994 A/W and detectivity of 4.3 × 1014 Jones. Especially, it enables the detection of weak light as low as 0.03 μW/cm2. These performance characteristics are ascribed to the interfacial engineering. In2Se3 and CsPb(Br/I)3 with type-II band alignment promote the separation of photocarriers, while h-BN passivates the impurities on CsPb(Br/I)3 and promises a high-quality carrier transport interface. Furthermore, this device is successfully integrated into an automatic obstacle avoidance system, demonstrating promising application prospects in autonomous vehicles.
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高影响因子
Catalysts
·
2023
·Vol. 13
·期 4
·726
·
IF 3.9
Jun Qiao,Kai Zheng,Zhiwei Lin,Huiye Jin,Wenbo Yu,Chao Shen,Aiquan Jia,Qianfeng Zhang
The exploration of inexpensive and stable heterogeneous catalysts for C–S coupling reactions remains a challenging issue. Herein, we successfully prepared a new biomass-derived copper catalyst and applied it to the selective C(sp3)–H-directed sulfonylation of ketone hydrazones with commercial sodium sulfinates. The catalyst was characterized using different spectroscopic and microscopic techniques. Importantly, the prepared biomass-supported Cu catalyst catalyzed the C–S coupling reaction with considerably high activity. A variety of aryl and alkyl sulfinates were converted to the corresponding sulfones with good yields. In particular, the heterogeneous catalyst could be recovered easily after the synthesis and consecutively used at least five times with no appreciable decrease in the catalytic activity. Lastly, the copper catalyst is expected to have further applications in organic reactions catalyzed by Cu/CuO2.Keywords:biomass-derived;copper catalysts;heterogeneous;C–S coupling
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CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Tanjun Deng,Wenli Lu,Xiaoxian Zhao,Haoyu Wang,Yumeng Zheng,Ao Zheng,Zhengyu Shen
Chronic wounds with bacterial infection present formidable clinical challenges. In this study, a versatile hydrogel dressing with antibacterial and angiogenic activity composite of silk fibroin (SF), chondroitin sulfate (CS), and graphene oxide quantum dots (GOQDs) is fabricated. GOQDs@SF/CS (GSC) hydrogel is rapidly formed through the enzyme catalytic action of horseradish peroxidase. With the incorporation of GOQDs both gelation speed and mechanical properties have been enhanced, and the photothermal characteristics of GOQDs in GSC hydrogel enabling bacterial killing through photothermal treatment (PTT) at ~51 °C. In vitro studies show that the GSC hydrogels demonstrate excellent antibacterial performance and induces type H vessel differentiation of endothelial cells via the activated ERK1/2 signaling pathway and upregulated SLIT3 expression. While in vivo results show that the hydrogel significantly promotes type H vessels formation, which related to the collagen deposition, epithelialization and, ultimately accelerating the regeneration of infected skin defects. Collectively, this multifunctional GSC hydrogel, with dual action of antibacterial efficacy and angiogenesis promotion, emerges as an innovative skin dressing with potential for advancing in infected wound healing.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xiaohong Tan,Wenzhan Li,Wei He,Tingting Yu,Bingbing Wan,Yong Huang,Jintao Liang,Guiyin Li
Glypican-3 (GPC3), which is a surface heparan sulfate proteoglycan, has been widely known the ideal biomarker for diagnosis and treatment of hepatocellular carcinoma (HCC). Accurate and sensitive detection of serum GPC3 level is an important and challenging task. In this paper, a sandwich electrochemical aptasensor was designed to specifically detect serum GPC3 level through aptamer-target-aptamer recognition. A GPC3 aptamer (GPC3 Apt ) immobilized on the surface of gold nanoparticles@reduced graphene oxide modified screen-printed electrode (Au NPs@rGO/SPCE) was used as the capture probe. Hemin-reduced graphene oxide-carboxymethyl chitosan@platinum nanoparticles (H-rGO-CMC@Pt NPs), with good mimicking peroxidases activity, were labeled with amination GPC3 aptamer, which was employed as the signal probe. Once the target GPC3 was anchored on the surface of GPC3 Apt /Au NPs@rGO/SPCE, the H-rGO-CMC@Pt NPs-GPC3 Apt was further specifically bound to the GPC3, forming the aptamer-target-aptamer sandwich structure, which can catalyze the oxidation of hydroquinone (HQ) to benzoquinone (BQ) and lead the oxidation current of HQ recorded by DPV to changing. The linear relationship between the current signal of oxidation of HQ and GPC3 concentration range of 0.0001–3.0 µg/mL and 3.0–60.0 µg/mL, with a low detection limit (LOD) of 0.0685 ng/mL. Additionally, the electrochemical aptasensor was successfully applied for the detection of GPC3 in human serum samples with the recovery of 99.95–104.06 % and relative standard deviation (RSD) of 1.31–5.22 %. Thus, the sandwich aptasensor could provide a new strategy for detection of serum GPC3 level and improve the early diagnosis rate of HCC.
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