Journal of Materials Chemistry C
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2017
·Vol. 5
·期 36
·9465-9471
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IF 5.256
Ting Lu,Hongjie Song,Xiaoqun Dong,Jianyu Hu,Yi Lv
NH2-MIL-53(Al) nanorods studded with F− were successfully synthesized via coordination modulation with HF as a modulator. The investigation of the growth mechanism pointed out that F− plays a key role in the formation process. The incorporation of F− into the framework of NH2-MIL-53(Al) not only made the crystal morphology tunable but also magnified the fluorescence enhancement performance of NH2-MIL-53(Al) in water vapor, based on which a highly efficient humidity sensor was fabricated. Among different kinds of humidity sensors, the present sensing system stood out due to its fast response rate, good sensitivity and high selectivity with a low detection limit of 0.6 μg mL−1 (S/N = 3) and a wide detection range from 4 to 40 μg mL−1. On the other hand, a majority of the conventional electronic humidity sensors seriously suffered from temperature dependence, while the present sensing system got over this disadvantage. Therefore, the NH2-MIL-53(Al) nanorod layer-based fluorescence sensing system has the potential for application in the real-time monitoring of humidity under ambient conditions.
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JOURNAL OF PLANT PATHOLOGY
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2024
·
IF 2.2
Reymick Okwong Oketch,Duan Bin,Feng Zhao,Zhang Yong Hua,Ouyang Qiuli,Kaaya Archileo N.,Tao Nengguo
Management of Penicillium digitatum requires use of highly effective fungicides that are not prone to drug resistance and are safe to humans and the environment. This study examined the fungicidal potential of combinations of cuminaldehyde (CA) + trans-2-hexen-1-al (TH) and CA + Citral. Both CA + TH and CA + Citral exhibited enhanced fungitoxicity against P. digitatum than CA, citral or TH alone. The minimum inhibitory concentration (MIC) of CA + Citral consisted of 0.13 ml/L CA and 0.3 ml/L citral, representing a synergistic interaction. MIC of CA + TH consisted of 0.12 ml/L CA and 0.15 ml/L TH, representing an additive interaction. The minimum fungicidal concentration (MFC) of CA + Citral and of CA + TH consisted of 0.26 ml/L CA and 0.6 ml/L citral, and 0.18 ml/L CA and 0.24 ml/L TH, respectively. 10×MFC CA + Citral in Tween-80 (WCI) delayed onset of hyphal growth in fruits inoculated with P. digitatum to day 5 compared to day 4 in the 10×MFC CA + TH in Tween-80 (WCT) treatment, and day 3 for the control samples. Daily green mold disease incidence and disease severity were much lower in WCI and WCT treatments than in the 10×MFC CA in Tween-80 (WCA) treatment and in control samples. Our results show that WCI was much fungitoxic against P. digitatum than WCT and WCA, its effect being comparable to that of imazalil. Additionally, at 25 ± 2 °C and 85–90% relative humidity, both WCI and WCT markedly preserved fruit quality by day 6 of treatment. WCI and WCT are thus, safe, cheap and highly effective alternatives to chemical fungicides being used to control postharvest green mold in citrus fruits.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Lin Cao,Jinming Piao,Wei Wang,Weijie Fan,Dongxiao Han,Yantong Pei,Ye Chen,Yue Zhang
To enhance corrosion resistance and extend the service life of coatings, layered double hydroxides (LDH) have been embedded into coatings to create a hybrid of organic–inorganic micro/nano-containers, improving the coatings’ physical barrier properties. Herein, an elaborately designed strategy is proposed to in-situ grow LDH on nanofibers , thereby obtaining polyvinylidene difluoride/hydrotalcite@deprotonated benzotriazole (PVDF/LDH@BTA − ) composite nanofibers , followed by incorporation into an epoxy resin to formulate the composite coating. The even distribution of LDH within the coating, aided by nanofibers, significantly bolstered the coating’s barrier effect. Upon exposure to corrosive environments, the hydrotalcite structure within PVDF/LDH@BTA − adsorbs chloride ions through anion exchange, capturing up to 0.26 mmol/cm 2 of chloride ions. Concurrently, corrosion inhibitors were released, forming a protective layer on the copper surface to substantially mitigate the corrosion process. This innovative approach markedly enhances the composite coating’s long-term corrosion resistance.
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FUEL
·
2024
·
IF 6.7
Xiandie Zhang,Haozhe Li,Xuxu Cui,Weiduo Fei,Xinwen Ma,Jiaming Liu,Pingyun Li,Xiaode Guo,Xiang Zhou
Aluminium (Al) powder is the most common solid fuel component in metastable intermolecular composites (MICs). It is used in the field of propellants to provide energy for the flight of rockets and missiles. However, the passivation layer overlaying its surface hinders its energy release. Using fluorine (F)-containing oxidisers may etch the passivation layer, enabling Al to achieve a more direct redox process and improving its energy-release capacity. Herein, NH 4 CuF 3 , which has nano-network structure, was synthesised through the solvo-thermal method, and n-Al was filled into the nano-pore channels using a simple ultrasonic mixing method to form a new n-Al/NH 4 CuF 3 MICs with excellent dispersion and interfacial contact. The thermal decomposition process of NH 4 CuF 3 was investigated, and the results showed that NH 4 CuF 3 could release hydrogen fluoride (HF) and ammonia (NH 3 ) gaseous products. The passivation layer on the surface of the Al powder was etched by HF, and the abundance of gaseous products during the reaction of n-Al/NH 4 CuF 3 Extended the combustion region. This can enhance air capture in the reaction system, minimise reaction sintering and aid in performing external work. Furthermore, n-Al/NH 4 CuF 3 exhibits a lower onset reaction temperature, shorter ignition delay time and greater external work ability than n-Al/CuF 2 and n-Al/CuO.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 134
·期 46
·45431
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IF 1.86
Ya Liu,Peng Qian,Yang Yu,Li Xiao,Yongliang Wang,Shufeng Ye,Yunfa Chen
Heavy metal ions such as Cu 2+ and Pb 2+ impose a significant risk to the environment and human health due to their high toxicity and non-degradable characteristics. Herein, Al(OH) 3 -polyacrylamide chemically modified with dithiocarbamates (Al-PAM-DTCs) was synthesized using formaldehyde, diethylenetriamine, carbon disulfide, and sodium hydroxide for rapid and efficient removal of Cu 2+ and Pb 2+ . The synthesized adsorbent was characterized by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis, scanning electron microscopy–energy dispersive X-ray spectroscopy analysis, and transmission electron microscope measurements. Al-PAM-DTCs showed rapid removal of Cu 2+ (<30 min) and Pb 2+ (<15 min) with high adsorption capacities of 416.959 mg/g and 892.505 mg/g for Cu 2+ and Pb 2+ respectively. Al-PAM-DTCs also had high capacities in removing suspended solids and metal ions simultaneously in turbid bauxite suspensions. FTIR, thermodynamic study, and elemental mapping were used to determine the adsorption mechanism. The rapid, convenient, and effective adsorption of Cu 2+ and Pb 2+ indicated that Al-PAM-DTCs has great potential for practical applications in purification of other heavy metal ions from aquatic systems. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45431.
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MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Yanjun Yin,Xueming Li,Yuanjie Shu,Xiaogang Guo,Hebin Bao,Wulin Li,Yuhua Zhu,Yu Li,Xinyue Huang
A novel porous Al/CuO nanothermite was successfully synthetized by utilizing the controllable electrophoretic deposition (EPD) method. The morphology and phase composition of the CuO and Al/CuO films were investigated in detail by field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). When the pH of the solution was 2.0, the surface area of the Al/CuO film was able to reach 495.6 m 2 /g, which was much higher than that of films grown at pH 1.0, 3.0 or 4.0. Meanwhile, the combustion performance and energy outputs were coincident with the results mentioned above. At pH 2.0, bright flames were observed after ignition, and the released heat of the nanothermite reaction reached 3.49 kJ/g, exhibiting excellent combustion performance and enhanced energy output.
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Catalysis Science & Technology
·
2016
·Vol. 6
·期 14
·5656-5667
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IF 5.287
Fufeng Cai,Guomin Xiao
In this work, a series of Cu–Co–Al catalysts with different Ce loadings were applied to the hydrogenolysis of glycerol to 1,2-propanediol in a fixed-bed flow reactor. The physicochemical properties of the synthesized catalysts were analyzed using BET, N2O chemisorption, SEM, TEM, XRD, H2-TPR, NH3-TPD and XPS techniques. Systematic characterization demonstrated that the incorporation of Ce into the Cu–Co–Al catalyst could effectively restrain the aggregation of active metal species as well as the growth of metallic particles during calcination and reduction, which resulted in the formation of highly dispersed active metals. Large amounts and superior strength of acid sites were present in the Ce-promoted Cu–Co–Al catalysts, as confirmed by NH3-TPD analysis. The reducible nature of the Cu–Co–Al catalyst greatly increased after the addition of Ce. The higher concentration of acid sites, excellent reducibility and highly dispersed active metals were responsible for the superior catalytic activity of the 8Ce/Cu–Co–Al catalyst and it attained 91.6% glycerol conversion and 92.4% 1,2-propanediol selectivity. In addition, the effects of different process parameters such as the solvent, reaction temperature, operating pressure, catalyst loading, glycerol concentration and liquid flow rate on glycerol hydrogenolysis together with the catalyst stability were studied in detail, showing that the Ce-promoted Cu–Co–Al catalyst had high efficiency and stability for glycerol hydrogenolysis.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xiang Ke,Xiang Zhou,Gaozi Hao,Lei Xiao,Jie Liu,Wei Jiang
One of the challenges for the application of energetic materials is their energy-retaining capabilities after long-term storage. In this study, we report a facile method to fabricate superhydrophobic Al/Fe 2 O 3 nanothermite film by combining electrophoretic deposition and surface modification technologies. Different concentrations of dispersion solvents and additives are investigated to optimize the deposition parameters. Meanwhile, the dependence of deposition rates on nanoparticle concentrations is also studied. The surface morphology and chemical composition are characterized by field-emission scanning electron microscopy, X-ray diffraction, X-ray energy-dispersive spectroscopy, and X-ray photoelectron spectroscopy. A static contact angles as high as 156° shows the superhydrophobicity of the nanothermite film. Natural and accelerated aging tests are performed and the thermal behavior is analyzed. Thermal analysis shows that the surface modification contributes to significantly improved energy-release characteristics for both fresh and aged samples, which is supposed to be attributed to the preignition reaction between Al 2 O 3 shell and FAS-17. Superhydrophobic Al/Fe 2 O 3 nanothermite film exhibits excellent long-time storage stability with 83.4% of energy left in natural aging test and 60.5% in accelerated aging test. This study is instructive to the practical applications of nanothermites, especially in highly humid environment.
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CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Xin Huang,Man Su,Jizhi Zhou,Weikang Shu,Zhifeng Huang,Naiyun Gao,Guangren Qian
Persulfate based advanced oxidation processes have been well investigated, with the generation of radical species via various activation methods. This study reports an activation pathway of peroxydisulfate (S 2 O 8 2− , PDS) without radical production, achieved by the intercalation of PDS into Mg/Al-layered double hydroxide (LDH). Physical characterization indicated that the LDH was intercalated by PDS with the interlayer distance increasing to 0.917 nm. Approximately 93.9% of the phenol was decomposed by a LDH-PDS composite containing 0.4 mmol/g PDS, whilst no removal of phenol was achieved in the control group with PDS. Moreover, sulfate from decay of PDS was likely kept in the layers of LDH for no sulfate leakage in solution was observed. This is in accordance with the occurrence of characteristic peaks assigned for sulfate in FT-IR spectrum of LDH-PDS after reaction. Interestingly, radicals were not recorded by electron spin resonance measurement or radical scavenger tests during the oxidation process. The reactivity of PDS was likely improved by the basic sites on the LDH laminate, which provided OH to activate the O O bond in PDS. Further, the limited space of LDH layers reduce the bond cleavage of intercalated PDS and thus the generation of radicals. Therefore, the results proposed a non-radical reaction between phenol and PDS in the interlayer of LDH and developed a novel activation pathway for PDS in the elimination of organic contaminants.
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GREEN CHEMISTRY
·
2017
·Vol. 19
·期 21
·5103-5113
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IF 9.125
Ying Duan,Min Zheng,Dongmi Li,Dongsheng Deng,Lu-Fang Ma,Yanliang Yang
The catalytic conversion of HMF to 2-hydroxy-3-methyl-2-cyclopenten-1-one (MCP), which is a valuable edible essence that has traditionally been obtained from adipic acid, was achieved with an isolated yield of 58%. This procedure comprised two steps: the hydrogenation of 5-hydroxymethylfurfural (HMF) to 1-hydroxy-2,5-hexanedione (HHD) in water on Pd/Nb2O5 catalysts and then the isomerization of HHD to MCP in the presence of a base. The Nb2O5 supports, which were acidic, were characterized by FTIR, XRD and NH3-TPD. The supported Pd/Nb2O5 catalysts, in which Pd was highly dispersed, were synthesized employing cyclohexene as a reductant and were characterized by XRD, TEM, ICP-AES, XPS, EDX and CO pulse chemisorption. The high conversion of HMF was attributed to the high dispersion of Pd, and the acidity of the supports led to high selectivity for HHD. The conversion of HHD to MCP was an intramolecular aldol condensation reaction, and the protonic solvent favored this reaction. Ca–Al was proved to be an effective solid base for the conversion of HHD to MCP in water.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2016
·Vol. 31
·期 6
·1211-1218
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IF 0.4
Zhang Dan,Zhao Guoqing,Yu Jingang,Yan Tao,Zhu Mingyue,Jiao Feipeng
Adsorption of 2, 4, 6-trichlorophenol (TCP) onto the calcined Mg/Al-CO 3 layered double hydroxide (CLDH) was investigated. The prepared Mg/Al-CO 3 layered double hydroxide (LDH) and CLDH were characterized by powder X-ray diffraction (XRD) and thermo gravimetric analyzer-differential scanning calorimeters (TG-DSC). Moreover, 2,4,6-trichlorophenol (TCP) was removed effectively (94.7% of removal percentage in 9 h) under the optimized experimental conditions. The adsorption kinetics data fitted the pseudo-second-order model well. The Freundlich, Langmuir, and Tempkin adsorption models were applied to the experimental equilibrium adsorption data at different temperatures of solution. The adsorption data fitted the Freundlieh adsorption isotherm with good values of the correlation coefficient. A mechanism of the adsorption process is proposed according to the intraparticle diffusion model, which indicates that the overall rate of adsorption can be described as three steps.
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CATALYSIS TODAY
·
2014
·
IF 3.309
Cong Zhang,Jing Xing,Liang Song,Hongchuan Xin,Sen Lin,Lishu Xing,Xuebing Li
Aqueous phase catalytic upgrading of phenolic monomers to hydrocarbons have been explored using Pd/C combined with HZSM-5 zeolite catalysts in the presence of H 2 . 2-Methoxyl-4-allylphenol (eugenol), which consists of methyl ether bond, hydroxyl group, aromatic ring and propyl olefin bond, was chosen as a classic lignin model compound. This research focuses on the relationship between the acidity of zeolites and the deoxygenation activities basis on the hydrodeoxygenation (HDO) of eugenol. The results indicated that the decrease of Si/Al ratio resulted in the increase of the acidity of the zeolites, which significantly influenced their catalytic performance for product distributions. Over the HZSM-5 (Si/Al = 12.5) catalyst, the 2-methoxyl-4-propylphenol conversion of 86.5% and the hydrocarbon selectivity of 73.4% were obtained with the HDO of eugenol under 513 K and 5 MPa hydrogen pressure. Owing to the lower selectivity of hydrocarbon with HZSM-5 (Si/Al = 50) as acidic catalyst, the pore treatment was used to enlarge the outer surface of zeolite. After modified by alkali-treatment, much more acid active sites were provided for feasible accessibility of oxygenated reactants. The selectivity of hydrocarbons was improved by the alkaline treatment of HZSM-5 zeolite with 0.3 mol L −1 sodium hydroxide solution.
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