International Journal of Electrochemical Science
·
2023
·
IF 1.5
Miao He,Yuting Xie,Jie Ni,Yan Jian,Shaoyi Song,Hebin Bao,Xuzhong Zeng,Xueming Li,Qihui Wang
In this study, Al/CuO energetic materials with high exothermic properties were prepared by electrophoretic deposition of nano-Al and CuO microboxes on Ti sheets. The microstructure and phase composition of Al/CuO energetic materials were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electrophoretic deposition behavior of nano-Al and CuO microboxes were systematically investigated, and the electrophoretic deposition process was controlled by diffusion. The differential scanning calorimetry results showed that the maximum heat released by Al/CuO energetic material is 3049 J/g at an equivalent ratio of 3.0. The combustion properties of Al/CuO energetic materials were tested by optical fiber spectra. When the equivalence ratio was 2.25, the intensity of the spectra of Al/CuO energetic materials were the strongest and the lowest color temperature was 2916 K. This work provides a reference for the preparation of highly exothermic Al/CuO energetic materials by electrophoretic deposition.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 33
·24986-24994
·
IF 2.779
Cheng Li-Qian,Jiang Guozheng,Ma Zhenhua,Xu Ze,Yu Minghao,Lu Jingtong,Chen Kai
Al-doped BaZr 0.2 Ti 0.8 O 3 (BZT20) ceramics were prepared by solid-state sintering, and the relaxation degree of phase transition was tailored effectively. The microstructure, dielectric properties, ferroelectric properties, and electrocaloric (EC) performance of Al 2 O 3 -doped BZT20 ceramics were studied, respectively. The results show that Al 2 O 3 doping induces changes in Curie temperature and dielectric properties. When the additive amount of Al 2 O 3 is 1.25 at.%, the Curie temperature drops to around room temperature (RT), and the dielectric loss is lower than that of pure BZT20 ceramics. The diffusion constant γ reaches a minimum value of 1.57 when the Al 2 O 3 content is 1.25 at.%, indicating that a relatively large latent heat would be gathered while there is a phase transition. As a result, an enhanced EC response of ∆ T max = 0.293 K near RT is obtained when the Al 2 O 3 content is 1.25 at.%, which is 1.6 times that of pure BZT20. It is also impressive that a wide working temperature range can be obtained, that is, T span = 73 K for BZT20 ceramics with 1 at.% of Al 3+ ionic content.
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MEASUREMENT SCIENCE and TECHNOLOGY
·
2022
·Vol. 34
·期 2
·025106
·
IF 2.398
Qianchun Zhang,Qin Zhou,Yun Wu,Yanxin Li,Fengling Tian,Shan Tang,Li Jiang
In this study, MIL-53(Al) and Sb2SnO5 were synthesized by hydrothermal and precipitation methods, respectively. The doped MIL-53(Al)/Sb2SnO5 showed excellent catalytic properties, specifically for selectivity and sensitivity for isobutanol (IBN). To assess the catalytic properties of MIL-53(Al)/Sb2SnO5, an IBN gas sensor based on cataluminescence of MIL-53(Al)/Sb2SnO5 was developed, and it demonstrated detection of IBN with high sensitivity, high specificity, fast detection, and good stability. The signal response and recovery time of IBN gas sensor were 0.5 s and 6 s, respectively, and a good linear relation was 0.050–2.5 μg ml−1 (R2 = 0.9956) with a low detection limit of 0.015 μg ml−1. Further, the IBN sensor applied in the detection of real samples had satisfactory recoveries (90.0%–108%) with relative standard deviations of 3.2%–6.7%. The developed sensor based on MIL-53(Al)/Sb2SnO5 has great prospects for the practical detection of IBN gas in the fields of environmental analysis, safety monitoring, etc.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 4
·9738-9748
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IF 5.19
Liu Jing,Xu Mingze,Zhang Tingsong,Chu Xueying,Shi Kaixi,Li Jinhua
TiO 2 is a catalyst that can effectively degrade organic pollutants with the following advantages, low cost, simplicity, and pollution-free nature. In recent years, the non-noble plasmonic metal Al has effectively improved the photocatalytic performance of TiO 2 . However, the current reports are limited to the photocatalytic performance of Al/TiO 2 on the substrate, which requires expensive large-scale vacuum equipment. In this study, monodispersed Al particles were proposed to enhance the photocatalysis of TiO 2 . The localized surface plasmon resonance (LSPR) effect of Al is proven by finite difference time domain method (FDTF) simulation. Then, Al/TiO 2 composites were prepared by combining monodispersed Al and TiO 2 . The influence of ligand (glutathione (GSH), glutamic acid (GAG), or 3-mercaptopropane acid (MPA)), Al size (40 to 300 nm), and the ratio of Al to TiO 2 (0.5:1 to 10:1) on the photocatalytic degradation of methylene blue (MB) by Al/TiO 2 were discussed. The obtained results showed that the Al/TiO 2 composite which were prepared with 200 nm Al particles, GSH as the ligand bridge, and an Al:TiO 2 ratio of 1:1 had the best MB degradation effect. It can degrade 97.7% of 10 mg/L MB in 100 min. The reaction rate of the Al/TiO 2 composite with the optimal photocatalytic performance is k =3.36×10 -2 min -1 , which is 10 times that of P25 TiO 2 . In addition, Al/TiO 2 has a good photocatalytic effect on rhodamine B (RhB) and crystal violet (CV). Therefore, Al/TiO 2 composites with the advantage of high efficiency are a type of potential photocatalytic material that can be used for the photocatalytic treatment of organic pollutants in water.
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高影响因子
FUEL
·
2022
·
IF 8.035
Zeng Zhang,Fei Wang,Jianchun Jiang,Hao Zhu,Yuchan Du,Junfeng Feng,Hui Li,Xiaoxiang Jiang
Lipid hydrotreatment to generate green diesel can weaken the dependence on unrenewable fossil fuels. The catalytic performance of Co catalyst is greatly limited by the dispersion and the number of Co active sites. To solve this problem, the Co-Al nanosheet was synthesized by using Co-Al LDH as the precursor. In the fatty acid hydrotreatment at 220 °C, the Co-Al nanosheet attained 98.0 % conversion and 64.3 % alkane yield, much higher than that of the Co/Al 2 O 3 catalyst (83.7 % conversion and 18.7 % alkane yield). From the catalyst characterizations, the excellent activity of Co-Al nanosheet was mainly ascribed to its high Co content and lamellar structure, exposing massive Co sites with high dispersion and small particle size. In addition, the high percentage of weak acidity, strong interaction between support and Co sites, and the improvement of the decarboxylation route also contributed to its catalytic performance. Moreover, the kinetics of octadecanol hydrotreatment over Co-Al nanosheet and Co/Al 2 O 3 revealed that octadecanol hydrotreatment more easily occurred over Co-Al nanosheet regarding the lower activation energy.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 23
·11158-11165
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IF 3.925
Jipeng Li,Yanzhi Sun,Yongmei Chen,Yang Tang,Junqing Pan,Pingyu Wan
In the present study, the preparation of a new MOF material His-MIL-53(Al) and its performance in the adsorption of Pb(II) from aqueous solution were investigated. The original material MIL-53(Al) was directly grafted with histidine to obtain the modified MOF material His-MIL-53(Al). The results show that His-MIL-53(Al) has excellent adsorption performance for Pb(II), and the adsorption process is in accordance with the pseudo first-order kinetics and the Langmuir adsorption model, with a maximum adsorption capacity of 50.13 mg g−1, which is much larger than the adsorption capacity of the original material MIL-53(Al). The experimental results also show that the prepared material has good recoverability. Our work demonstrates the applications of His-MIL-53(Al) as a promising material in the adsorption of heavy metals.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Shu-ji Wang,Di Wang,Peng Chen,Shi Yan,Qing-jie Jiao,Xue-yong Guo
Micro-nano composite energetic materials have attracted extensive attention from researchers due to their excellent properties. Electrostatic spray drying, as an emerging composite material preparation technology, has an important impact on the assembly and energy release regulation of energetic materials. In this paper, NC with excellent mechanical properties was selected as the energetic binder. The uniform assembly of TKX-50 and Al was achieved by electrostatic spraying technology, and Al@TKX-50@NC micro-nano composite energetic material microspheres were prepared. The structure and composition of the composite were characterized, and its thermal decomposition kinetics and thermodynamics were calculated and analyzed. At the same time, its ignition and combustion performance were tested. It is found that the samples prepared by electrostatic spray are regular spherical, and the particle size is about 1–6 μm. Compared with the physical mixture samples, the Al@TKX-50@NC composite microspheres not only have a more complete oxidation reaction but also have better ignition and combustion performance. The results show that the electrostatic spray method is very effective in improving the energy release of composite energetic materials.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
E. Shuang,Qiong Wang,Kuichuan Sheng,Ximing Zhang
The development of a simple and feasible process for preparing adsorbent materials to recover phosphorus resources would have significant environmental and social benefits. In this study, the Al-modified hydrochar was synthesized for phosphate adsorption by hydrothermal carbonization in one pot using corn stover as raw material. The results showed that phosphate adsorption mainly depended on the precipitation reaction between Al element and phosphate, in which the hydrochar carrier played a synergistic role. Al element through the hydrothermal treatment loaded on hydrochar expressed a much higher phosphate adsorption performance than that on pyrochar. When the concentration of AlCl 3 solution added in the hydrothermal process was 2 mol·L −1 and the hydrothermal temperature exceeded 180 ℃, Al element could transform from the amorphous state, which was less effective for phosphate adsorption, to Al 24 O 11 (OH) 44 Cl 6 crystal with high adsorption performance and could be more stably loaded onto the hydrochar. Although the preparation process was simple, the adsorption performance of hydrochar is good. The phosphate adsorption capacity and removal efficiency by the hydrochar prepared at 260 °C reached to 114.40 mg·g −1 and 76.27%, which could be further increased by adjusting the dosage of adsorbent and pH of water. The pseudo-second-order kinetic model and Langmuir isotherm model could better describe the phosphate adsorption process on Al-loaded hydrochar. Phosphate was rapidly adsorbed on the surface of the hydrochar rich in mesoporous structure and bound to the surface-active sites. This study could transform agricultural waste into a functional hydrochar-based adsorbent and provide a low-cost, simple operation and efficient phosphate removal technology .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zheng Zhu,Linlin Qin,Yulong Liu,Qiqi Zhang,Peng Cheng,Wenyan Liang
Lanthanum (La) is constantly used in phosphorus removal due to its high affinity with phosphate. Herein, a novel La/Al bimetallic organic framework was developed to improve the usage efficiency of La species. The effects of metal ratio, pH value and competitive anions were investigated, through which the adsorption mechanism was further explained. Results showed that when the doped La:Al ratio was 1:3, the absorbent (La 1 Al 3 -BTC) achieved the most excellent adsorption capacity of 210.3 mg P·g −1 and usage efficiency (P/metal ratio = 1.09). La 1 Al 3 -BTC can adapt to the wide pH range and multitudinous coexisting ions in real water, and its adsorption process was in accordance with Langmuir and pseudo-second-order models. Surface morphology of materials transformed from rod-like crystal to amorphous structure as the increase of Al doping. La replaced some Al atoms and embedded in Al-BTC skeleton. The specific surface area raised from 9.27 m 2 ·g −1 of La-BTC to 257.01 m 2 ·g −1 of La 1 Al 3 -BTC. The main mechanism for the adsorption of phosphate was the inner-sphere complexation occurred in the La active sites. Electron migration between different metals enhanced the adsorption process. Density-function theory (DFT) calculation well matched the experimental phenomenon. Overall, the development of La 1 Al 3 -BTC presented new potential applications for enhanced phosphorus removal and provided new insights for the design of La-based adsorbents.
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Journal of Energetic Materials
·
2023
·
IF 2.1
Jin-Qiang Zhou,Yi-Ming Wang,Hua Fang,Peng Deng,Jian-Xin Nie,Xue-Yong Guo,Rui Liu
The design and preparation of new high-energy composite DAP-4/Al is very important for the study of composite solid propellants. In this work, the combustion properties and reaction mechanism of DAP-4/Al composites doped with WO3 nanoparticles were studied. DAP-4/Al composites were prepared by different mass ratios. The combustion state, combustion time, pressure, pressurization rate and flame temperature of DAP-4/Al/WO3 with different mass ratios were monitored. The results show that the combustion performance of DAP-4/Al can be significantly improved under the catalysis of WO3. Compared with DAP-4/Al-5, the average combustion time of DAP-4/Al/W-4 is significantly reduced by ~ 70 ms, the average combustion pressure is increased by 654 KPa, and the average pressurization rate is increased by 0.22 MPa·s−1. Under the catalysis of WO3, the activated substances can react rapidly with H2dabco2+ and NH+ to produce CO2, CO, N2 and H2O. When the mass ratio is 20:80:2, the average maximum combustion heat of DAP-4/Al/W-4 is 8474 J/g, which is higher than 493 J/g of DAP-4/Al-5. The reaction mechanism of WO3 catalyzed DAP-4/Al system was further analyzed by TG-MS and XPS. This work provides a new idea for the future application of DAP-4/Al composites in solid propellants.
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SEPARATION SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.8
Guohua Li,Aimin Zhang,Xianjin Qi,Guizhi Yan,Gang Zhi
In the process of removing arsenic in an arsenic-containing aqueous solution, a large amount of harmful arsenic-containing waste is usually discharged. In this paper, a recyclable and environmentally friendly method of removing arsenic with Al/Ti-supported chitosan (ATC) was proposed. The results show that ATC has the best adsorption effect on arsenic at pH 8 at room temperature. In addition, the ratio of Al and Ti to chitosan (CB) affects the adsorption effect of ATC on arsenic. When Al: Ti: CB is 1:1:10, the removal rate of arsenic is as high as 99%. ATC can rapidly adsorb arsenic within 30 min. The adsorption kinetics shows that the adsorption of ATC on arsenic follows the joint action of physical adsorption and chemical precipitation. The adsorption isotherm shows that the adsorption process is multilayer adsorption. Finally, ATC has good recycling ability and is an efficient arsenic-removing agent in the treatment of arsenic-containing aqueous solutions. It shows great potential in the remediation of heavy metal-containing aqueous solutions.
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AICHE JOURNAL
·
2020
·Vol. 66
·期 5
·e16923
·
IF 3.519
Jian Zhang,Liang Wang,Zhiyi Wu,Hai Wang,Bingsen Zhang,Feng-Shou Xiao
We report mesoporous Co-Al oxide nanosheets (Co x Al-Ns, where x denotes the Co/Al ratio in the samples) prepared by calcination of CoAl-hydrotalcite and subsequent alkaline treatment. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy measurements show that the prepared Co-Al oxide nanosheets (Co x Al-Ns) are very thin (10–15 nm) and exhibit high mesoporosity (3–5 nm). Catalytic CO oxidation tests reveal that the Co x Al-Ns exhibit excellent catalytic performances at relatively low temperatures: for example, the Co 2.5 Al-Ns catalyst could achieve 99% CO conversion at −98°C. Kinetic studies and experimental investigations indicate that the high activity of the Co 2.5 Al-Ns sample is strongly related to the abundance of active sites associated with the large Brunauer–Emmett–Teller surface area. The Co 2.5 Al-Ns catalyst also achieves full conversion of CO in tests performed with a gas mixture simulating automobile exhaust gas at 200°C. After loading the Co 2.5 Al-Ns on a porous ceramic substrate, the obtained Co 2.5 Al-Ns/PC shows high activity and stability in CO oxidation process. These features are potentially important for future industrial applications of these catalysts.
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