Polymers
·
2024
·Vol. 16
·期 13
·1919
·
IF 4.7
Yang Lyu,Weipeng Sun,Tingyou Feng,Wenge Li,Yong Jiang,Chenglin Zuo,Shuangxi Wang
Steel structures located in subtropical marine climates face harsh conditions such as strong sunlight and heavy rain, and they are extremely corroded. In this study, a waterborne coating with excellent corrosion resistance, hydrophobic ability, high-temperature resistance and high density was successfully prepared by using modified nanoscale titania powders and grafted polymers. The effects of three modifiers on titania nanoparticles and waterborne coatings’ properties were studied independently. The experimental results showed that the activation index of the modification employing methacryloxy silane reached 97.5%, which achieved the best modification effect at 64.4 °C for 43.3 min. The waterborne coating with nanoscale titania modified by methacryloxy silane exhibited the best hydrophobic effect, with a drop contact angle of 115.4° and excellent heat resistance of up to 317.2 °C. The application of the waterborne modified coating in steel structures under subtropical maritime climates showed that the waterborne titania coatings demonstrated excellent resistance to corrosion, high temperatures and harsh sunlight, with a maximum service life of up to five years. Economic analysis indicated that, considering a conservative three-year effective lifespan, this coating could save more than 50% in cost compared with conventional industrial coatings. Finally, the strengthening mechanism of the polymer coatings with modified nanoscale titania was analyzed.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xin Liu,Qunzhi Zhu,Wenjing Wu
Water is one of the most essential human rights, and every human being has the right to drink pure water. Approximately 2.1 billion people worldwide do not have access to safe drinking water, and with a growing population, increasing global industrialization has intensified water stress in many parts of the world. Solar-driven interfacial evaporation, as a sustainable and environmentally friendly technology, transforms external solar energy into thermal energy through a photothermal evaporator to produce fresh water. In this paper, we prepared MoS 2 -rGO aerogels (MGA) from molybdenum sulfide (MoS 2 ) and reduced graphene oxide (rGO) by one-step hydrothermal and vacuum freeze-drying methods. The prepared aerogels have vertical loose water transport channels and good mechanical properties, and the light absorption of MoS 2 -rGO aerogels in the solar spectrum (280–2500 nm) reached 86.3 %. The water evaporation rate under one solar radiation intensity condition reached 1.72 kg m −2 h −1 with a photothermal conversion efficiency of 86.5 %. What’s more, the MGA has good salt-resistant properties and cycling stability and always maintains a stable evaporation rate and evaporation efficiency in 15 evaporation cycle tests. In addition, the simplicity and low cost of our aerogel preparation process show a potential way to achieve water purification and desalination in daily life.
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SOLAR ENERGY
·
2017
·
IF 4.018
Zhaoli Zhang,Yanping Yuan,Sami Alelyani,Xiaoling Cao,Patrick E. Phelan
Ternary carbonates in the form of Li 2 CO 3 -Na 2 CO 3 -K 2 CO 3 enforced by expanded graphite, graphene nanosheets and multi-walled carbon nanotubes are originally prepared though the solution-evaporation with the purpose of enhancing heat transfer for employment in concentrating solar power. FT-IR, XRD and SEM results indicate that three carbon materials are physically dispersed into composite carbonates with the effect of supporting structural support as well as improved thermal properties. The presence of carbon materials presents a slight effect on the melting and freezing temperature of ternary carbonates. It is apparent that enhancement of carbon materials on the heat transfer of the composite carbonates is mainly manifested in the aspect of thermal conductivity improvement. Expanded graphite, graphene nanosheets and multi-walled carbon nanotubes show respectively the enhancement of approximately 59.1%, 32.9% and 24.8% on average to thermal conductivity. Carbon materials also illustrate obvious improvement on the specific heat and the strengthening effect of liquid composite carbonates is generally better than that of solid carbonates. Average specific heat of composite carbonates modified by expanded graphene, graphene nanosheets and multi-walled carbon nanotubes is 1.278, 1.322 and 1.299 J/(g·°C) for solid and 1.502, 1.638, and 1.533 J/(g·°C) for liquid, respectively. Additionally, prepared composite carbonates exhibit superior cyclic stability and it is concluded that composite carbonates with carbon materials as effective latent heat storage materials will have great potential for application in thermal energy storage in terms of satisfactory thermal properties.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2016
·Vol. 310
·期 2
·671-678
·
IF 0.983
Li Shicheng,Wang Xiaoli,Huang Zhaoya,Du Liang,Zhang Dong,Tan Zhaoyi,Fu Yibei,Wang Xiaolin
In this study, we examined the sorption and desorption behavior of U(VI) on/from a Chinese bentonite in the solid–liquid system using batch experiments, and the influence of pH, ionic strength and humic acid (HA) on the sorption–desorption hysteresis in the solid–liquid system were quantitatively calculated. It was revealed that the hysteresis was enhanced with increasing pH and increasing ionic strength. HA promoted the sorption, but lower the sorption–desorption hysteresis. Meanwhile, hysteresis in ternary bentonite-HA-U system was found to be higher than that in bentonite-U-HA system, indicating different sorption structures formed because of different addition sequence.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 29
·15056-15064
·
IF 8.867
J. R. Zeng,M. Y. Gao,Q. B. Zhang,C. Yang,X. T. Li,W. Q. Yang,Y. X. Hua,C. Y. Xu,Y. Li
The development of low-cost, earth-abundant, and high-efficiency catalysts for electrocatalytic water splitting is central to developing sustainable and clean energy. The abundant reserves of nickel sulfides are promising noble metal-free materials for the hydrogen evolution reaction (HER). In this work, a highly active cauliflower-like S-doped nickel microsphere film directly grown on a copper wire (CW) substrate (labeled as NiSx/CW) was facilely prepared via a one-step electrodeposition approach in a choline chloride/ethylene glycol (ethaline)-based deep eutectic solvent. Doping of S is found to induce an interesting structural transition from nanosheets to porous cauliflower-like microspheres, electronic structure changes at the surface, and a significant improvement in the HER catalytic performance. The as-prepared NiS0.25/CW with a Ni/S atomic ratio of 1 : 0.25 exhibits the best performance, showing a negligible onset potential (−18 mV) with a low overpotential (−54 mV at 10 mA cm−2) and small Tafel slope (54 mV dec−1) in 1.0 M KOH solution. Additionally, the NiS0.25/CW catalyst displays good durability and affords long-term electrolysis without activity degradation for 60 h. This study offers a facile synthesis route for in situ growth of the active phases on current collectors to fabricate self-supported noble-metal free HER catalysts and deep insights into the relationships among the S-doping, catalyst microstructure, and catalytic properties.
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RSC Advances
·
2017
·Vol. 7
·期 48
·30051-30059
·
IF 3.108
Minghui Shang,Huilin Hou,Fengmei Gao,Lin Wang,Weiyou Yang
Photocatalytic hydrogen evolution is a promising solution to energy and environmental problems. The grand challenge for its application is how to make photocatalysts with satisfactory efficiency. In the present work, exploration of Ag@TiO2 mesoporous nanofibers via two strategies is reported, namely in situ electrospinning preparation (strategy I) and electrospinning combined with subsequent photodeposition (strategy II). The photocatalytic behavior of the as-synthesized Ag@TiO2 hybrid nanofibers was evaluated in terms of hydrogen evolution efficiency for the photodecomposition of water under Xe lamp irradiation. It was found that incorporation of Ag nanoparticles into the TiO2 mesoporous nanofibers could enhance remarkably their photocatalytic efficiency. The products prepared through strategy I exhibited the highest photocatalytic performance as compared with those prepared by strategy II. Current work might give some insight into exploration of stable binary photocatalysts, which have potential applications for efficient hydrogen evolution.
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Food Analytical Methods
·
2017
·Vol. 10
·期 10
·3415-3423
·
IF 2.038
Sha Min,Zhang Zhengyong,Gui Dongdong,Wang Yanbo,Fu Linglin,Wang Haiyan
A fingerprinting approach was developed by means of high-performance ion mobility spectrometry with direct electrospray ionization (ESI-HPIMS) for the quality consistency and authentication of apple essence which contain many analytes. Thirty-four apple essence samples of the same brand and commercialized as a same product but brewed in four different manufacturers were used to establish the fingerprints. Hierarchical clustering analysis (HCA) was performed to evaluate the similarity and variation of these samples. A combined data matrix was constructed with the use of individual data matrix of ion mobility spectrum in positive and negative ion modes. For comparison, ion mobility spectrum fingerprints in positive and negative ion modes respectively were also applied to the quality assessment of the same samples. Finally, our study demonstrated that the fusion of fingerprints did indeed provide more information and could be used to comprehensively conduct the quality consistency evaluation and discrimination of apple essences from similar products. It is suggested that this fingerprint approach is suitable for analysis of other complex, multianalyte substances.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 10
·4856-4863
·
IF 2.302
Han Sheng,Wang Chi,Huang Yanshan,Jiang Jianzhong,Huang Yinjuan,Xu Zhixiao,Wu Dongqing
Three-dimensional hybrids of cobalt oxide (Co 3 O 4 ) and graphene frameworks are fabricated via a facile hydrothermal self-assembly process. By adjusting the time of the hydrothermal treatment, the morphologies of the Co 3 O 4 components can be modified from rods to nanoparticles, which further manifest influences on the electrochemical performance of the hybrids. As the anode in lithium-ion battery, the hybrid loaded with spherical Co 3 O 4 nanoparticles exhibits the highest reversible capacity of 1148 mA h g −1 at 100 mA g −1 for 100 cycles among the three samples. Even at a high current density of 5000 mA g −1 , its reversible capacity is still kept at 600 mA h g −1 , outperforming the reported hybrids of Co 3 O 4 and graphene.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2016
·
IF 2.857
Pingxiang Liu,Hongping Chen,Guanwei Gao,Zhenxia Hao,Chen Wang,Guicen Ma,Yunfeng Chai,Lin Zhang,Xin Liu
The residues of 16 phthalate esters (PAEs) in fresh tea leaves and made tea were determined via gas chromatography–tandem mass spectrometry to study their distribution and degradation characteristics during tea planting and processing. Five PAEs were detected in all fresh tea leaves, and higher concentrations were detected in mature leaves. The distribution of PAEs in fresh tea leaves ranged from 69.7 to 2244.0 μg/kg. The degradative percentages of ∑5PAEs during green tea manufacturing ranged from 61 to 63% and were significantly influenced by the drying process. The transfer rates of PAEs-D4 ranged from 5.2 to 100.6%. PAEs with a high water solubility showed the highest transfer coefficient in the range of 91.8–100.6%, whereas PAEs with a high log Kow showed a low leaching efficiency below 11.9%. These results benefit the risk evaluation and establishment of a maximum residue limit for PAEs in tea.
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RSC Advances
·
2017
·Vol. 7
·期 50
·31173-31179
·
IF 3.108
Chao Pang,Ruiqiang Yang,Amit Singh,Hanjiao Chen,Michael K. Bowman,Ningzhong Bao,Liming Shen,Arunava Gupta
Anisotropic-shaped CuCr2Se4 nanocrystals have been synthesized by thermal decomposition and reaction of novel mixed metal–oleate complexes with selenium in a high-boiling point organic solvent, trioctylamine (TOA). The synthesized CuCr2Se4 nanocrystals exhibit close to triangular and hexagonal morphology, with an average size of 20 nm. X-ray diffraction patterns and XPS spectral analysis confirm the formation of the pure spinel phase without any impurities. A possible reaction mechanism is suggested and formation pathways for the triangular and hexagonal shaped CuCr2Se4 nanocrystals are proposed. Magnetic studies indicate that the anisotropic-shaped CuCr2Se4 nanocrystals are superparamagnetic near room temperature but exhibit ferromagnetic behavior at lower temperatures, with magnetization values of 31 and 43 emu g−1 at 300 and 5 K, respectively.
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MATERIALS & DESIGN
·
2016
·
IF 3.997
Qiang Wang,Bing Dai,Jie Bai,Zhenhuai Yang,Shuai Guo,Yujie Ding,Lei Yang,Pei Lei,Jiecai Han,Jiaqi Zhu
A simple and efficient strategy is introduced for fabricating a layer of superhydrophobic and superoleophilic membrane on the surface of porous materials by self-assembly, and it is of great interest for the new type separation of oil and water. It is realized in this study by synthesizing an array of vertically aligned composite microcones on the surface of nickel foam by microwave plasma assisted chemical vapor deposition . The hierarchical structure, high aspect ratio , and dual-scale pine tree-like nature of the microcones formed on the nickel foam, which has microscale pores, in combination with the low surface energy of carbon, amplify both the hydrophobicity and the oleophilicity of the membrane. In addition, the membrane exhibits pH-responsivity, and the controllable water permeation can be realized by simply altering the water pH. Given its extremely high hydrophobicity and oleophilicity as well as outstanding mechanical durability, the composite frame can be used as a filter to separate oil/water mixtures and as an intelligent sponge to purify oil-contaminated water with excellent separation efficiency and absorption capacity . It should also be ideal for real world use in various environmental and chemical separation processes.
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CHEMICAL COMMUNICATIONS
·
2016
·Vol. 52
·期 75
·11274-11276
·
IF 6.567
Jin Han,Maowen Xu,Yubin Niu,Guan-Nan Li,Minqiang Wang,Yan Zhang,Min Jia,Chang ming Li
Novel K2Ti8O17 is successfully fabricated via a facile hydrothermal method combined with a subsequent annealing treatment and further evaluated as an anode material for potassium-ion batteries for the first time. This study may provide a broader vision into developing anode materials for potassium-ion batteries.
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