Scientific Reports
·
2019
·Vol. 9
·期 1
·1-13
·
IF 4.011
Yuan Xiaoyu,Yin Chunyue,Zhang Yuanyuan,Chen Zengyue,Xu Yifan,Wang Jun
In this paper, a double hollow spherical shell composite modified with layered double hydroxide (C@Ni-Al LDH HSS) was fabricated for uranium(VI) (U(VI)) adsorption. Various batch experiments were carried out to investigate the influence of pH, concentration, time and coexistence ion on extraction. The results showed that the adsorption processes of U(VI) onto C@Ni-Al LDH HSS were spontaneous and endothermic and closely followed pseudo-second-order and Langmuir isotherm models. The equilibrium time and maximum adsorption capacity of C@Ni-Al LDH HSS was 360 min and 545.9 mg g −1 . FT-IR and XPS analyses proved that the adsorption behavior was primarily attributed to the strong interaction between oxygen-containing functional groups and U(VI). Moreover, the extraction of trace U(VI) (μg L −1 ) in artificial and natural seawater was also studied. The results showed that C@Ni-Al LDH HSS provided a promising application for the efficient extraction of U(VI) from seawater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Tao Yan,Hui Ren,Jie Liu,Qingjie Jiao
To improve reaction rate of energetic materials, electrospray technology was applied to develop microspheres in which recrystallized cyclotrimethylene trinitramine (RDX) was integrated with nano-Al (nAl) particles and Viton through a two-solvent strategy. Results on morphology properties and chemical heterogeneity demonstrated that the electrosprayed microspheres were hollow spheres containing well-dispersed RDX . It was suggested that RDX nano-crystals adhere tightly on both sides of the nAl@Viton skeletons, thereby increasing the contact area among components. The thermal analysis of the microspheres indicated that nAl particles accelerated the energy release by decreasing the apparent activation energy for microsphere decomposition. Experimental results showed that electrosprayed nAl@RDX@Viton had shorter laser ignition delay and more vigorous combustion flame than the physical mixture, which benefitted from the characteristic structure and synergistic effects of the components.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2019
·
IF 3.019
Wanjun Zhao,Hui Ren,Yapeng Ou,Qingjie Jiao
The ignition temperature and combustion behavior are key parameters for the performance of energetic nanocomposites. This article aims to obtain nanocomposites with low ignition temperature and high reactivity by incorporating titanium nanoparticles (nTi) to aluminum nanoparticles (nAl)-based thermites. The ignition temperature, reactivity, and combustion efficiency of Al/xTi/oxidizer composites were investigated via temperature-jump (T-jump), combustion test, and calorimeter. The results reveal that the ignition temperature of Al/ x Ti/oxidizer composites shifted down ~90 °C, ~140 °C, and ~220 °C by adding 50 mol.% nTi (in the fuel) into nAl/KClO 4 , nAl/K 2 S 2 O 8 , and nAl/KIO 4 respectively. The reactivity of nAl/K 2 S 2 O 8 and nAl/KIO 4 also increased by 50% after adding 30% nTi. However, the combustion efficiency of nAl-based energetic composites reduced with the increasing contents of nTi. This study demonstrates that Al/ x Ti/K 2 S 2 O 8 and Al/ x Ti/KIO 4 nanocomposites with low ignition temperature, high reactivity, and moderate combustion efficiency are good candidates for energetic applications.
✓ 已验证
DOI
高影响因子
Journal of Chemistry
·
2019
·
IF 1.727
Fei Chang,Zhong Bing He,Quan Zhou
Four kinds of Al-TiO2 solid samples with different Ti/Al ratios of 1 : 0.1, 1 : 0.09, 1 : 0.07, and 1 : 0.05 were synthesized via a solid-phase synthesis method and characterized by XRD, SEM, EDS, BET, and other techniques. The prepared solids were used for separation of the bioderived product danshensu, the content of which was determined by UV spectrophotometry. Moreover, the effects of extract concentration, PH value, adsorption time, and ethanol elution volume were investigated. The results showed that these Al-TiO2 samples had good adsorption and desorption ability. Especially, the solid Al-TiO2 with a Ti/Al ratio of 1 : 0.05 is more suitable for the separation of danshensu, exhibiting a higher adsorption (77.70%) under 2 h adsorption time and pH = 3; meanwhile, the high desorption rate (70.29%）was received under 80% ethanol and the sample concentration of 3.0 mg/mL.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 5
·4115-4123
·
IF 2.993
Zhou Xiang,Zhu Ying,Ke Xiang,Zhang Kaili
In this study, we use simultaneous differential scanning calorimetry and thermogravimetric analysis to analyze the solid-state reaction characteristics of Al/Fe 2 O 3 nanothermites before n -Al melts. Different experimental setups for thermal analysis are compared, and the heat-release characteristics are studied on Al/Fe 2 O 3 nanothermites in the form of powder and pellet, respectively. It is found that protection provided by mere argon flow is far from enough for thermal analysis of Al/Fe 2 O 3 nanothermites. The experimental setup must be free of oxygen; otherwise, the determined exothermic peak is mostly the oxidation of n -Al by the residue oxygen molecules in the furnace body, due to the high reactivity and moderate accessibility of free oxygen molecules. Under proper experimental setup, it is found that besides the redox reaction between n -Al and n -Fe 2 O 3 , intermetallic reaction also occurs to form Fe 4 Al 13 . Moreover, the intermetallic reaction is more noticeable for nanothermite pellet than for nanothermite powder, and the eutectic reaction of Fe 4 Al 13 and n -Al leads to melting peaks below 655 °C. The results indicate that instrument configuration and sample status affect the testing results to a large extent, and one should be prudent to derive reaction characteristics of nanothermites.
✓ 已验证
产品关联
DOI
高影响因子
Metals
·
2018
·Vol. 8
·期 10
·738
·
IF 1.704
Qiong Xu,Aibin Ma,Junjie Wang,Jiapeng Sun,Jinghua Jiang,Yuhua Li,Chaoying Ni
Relatively low compactness and unsatisfactory uniformity of reinforced particles severely restrict the performance and widespread industry applications of the powder metallurgy (PM) metal matrix composites (MMCs). Here, we developed a combined processing route of PM and equal channel angular pressing (ECAP) to enhance the mechanical properties and wear resistance of the SiCp/Al-Si composite. The results indicate that ECAP significantly refined the matrix grains, eliminated pores and promoted the uniformity of the reinforcement particles. After 8p-ECAP, the SiCp/Al-Si composite consisted of ultrafine Al matrix grains (600 nm) modified by uniformly-dispersed Si and SiCpparticles, and the composite relative density approached 100%. The hardness and wear resistance of the 8p-ECAP SiCp/Al-Si composite were markedly improved compared to the PM composite. More ECAP passes continued a trend of improvement for the wear resistance and hardness. Moreover, while abrasion and delamination dominated the wear of PM composites, less severe adhesive wear and fatigue mechanisms played more important roles in the wear of PM-ECAP composites. This study demonstrates a new approach to designing wear-resistant Al-MMCs and is readily applicable to other Al-MMCs.Keywords:SiCp/Al-Si composites;powder metallurgy (PM);rotary-die equal-channel angular pressing (RD-ECAP);wear performance
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Ge Gao,Zhi Zhu,Jia Zheng,Zhi Liu,Qiu Wang,Yongsheng Yan
The two-dimensional (2D) ultrathin Mg-Al layered double hydroxide modified by magnetic Fe 3 O 4 (Fe 3 O 4 /Mg-Al LDH) was successfully synthesized via the co-precipitation method. The Fe 3 O 4 /Mg-Al LDH not only exhibits superior separation efficiency of charge carriers but also possesses signally enhanced photocatalytic activity for CO 2 reduction than Mg-Al LDH. The as-prepared Fe 3 O 4 /Mg-Al LDH affords the CO and CH 4 generation rate of 442.2 µmol g −1 h −1 and 223.9 µmol g −1 h −1 . The enhanced reduction CO 2 activity mainly comes from synergetic effect of Fe 3 O 4 and ultrathin Mg-Al LDH. And Fe 3 O 4 can increase the separation efficiency of photogenerated electron-hole pairs, and ultrathin Mg-Al LDH can reduce the transmission resistance of charge carriers. Moreover, a detailed mechanism insight of Fe 3 O 4 /Mg-Al LDH for CO 2 reduction is also investigated by a series of characterization methods and activity experiments. This work offers a simple and environment-friendly approach to develop recycled photocatalysts in CO 2 reduction treatment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2012
·
IF 3.461
Bo Yang,Shubo Deng,Gang Yu,Yonghong Lu,Hong Zhang,Jianzhong Xiao,Gang Chen,Xiaobing Cheng,Lili Shi
Nanoscale Al particles with average diameter of about 100 nm were employed to prepare Pd/Al nanoparticles (NPs) by chemical displacement deposition. It was proved that Pd 2+ acidic deposition solution was superior to its alkaline deposition solution in terms of Pd loading rate on Al NPs. The Pd/Al NPs were characterized by ICP–OES, SEM, TEM, XRD, BET and then used to explore hydrodechlorination (HDC) performance of 3-chlorophenol (3-CP) in aqueous solution. Major factors affecting HDC efficiency were investigated including Al substrate sizes, pH, Pd loadings in Pd/Al NPs, dosage of Pd/Al NPs, and temperature. The optimal results indicated that nanoscale Pd/Al bimetallic particles were highly effective for 3-CP HDC. HDC efficiency was only about 30% in 50 min reaction with micron sizes of Pd/Al particles (100–400 mesh), whereas it increased to 99.7% within 30 min using Pd/Al NPs at 25 °C. Aqueous pH presented remarkable effect on HDC and pH 3–4 was the optimum range for HDC as pH varied from 2 to 11. Pd loadings and Pd/Al dosages were optimized for highly effective HDC as 1.16 wt.% and 2 g/L, respectively. In addition, higher HDC performance was obtained while reaction temperature arrived at 45 °C and 0.389 mM of 3-CP could be completely dechlorinated into phenol only within 10 min reaction.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2015
·
IF 1.644
Jun-qin Wang,Jian-feng Gao,Zhi-gang Wu,Guo-li Ou,Yu Wang
The research on hydrogen generation and application has attracted widespread attention around the world. This paper is to demonstrate that sodium aluminum hydride can be synthesized under simple and mild reaction condition. Being activated through organics, aluminum powder reacts with hydrogen and sodium hydride to produce sodium aluminum hydride under atmospheric pressure. The properties and composition of the sample were characterized by FTIR, XRD, SEM, and so forth. The results showed that the product through this synthesis method is sodium aluminum hydride, and it has higher purity, perfect crystal character, better stability, and good hydrogen storage property. The reaction mechanism is also discussed in detail.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2014
·Vol. 97
·期 11
·3555-3560
·
IF 2.428
Songping Wu,Juanjuan Xue,Yingxian Fan
Spinel Mg(Al 1− x Ga x ) 2 O 4 ( x = 0–1) solid solutions were synthesized via solid-state method. Replacement of Al 3+ by Ga 3+ in MgAl 2 O 4 gave rise to the expansion of the lattice, as well as blueshifts of FT-IR and Raman peaks. The homogeneous solid solutions, high relative densities, large grain sizes, and compact microstructures resulted in excellent microwave dielectric properties for spinel Mg(Al 1− x Ga x ) 2 O 4 ( x = 0.6) ceramics sintered at 1485°C: that is, ε r = 8.87, Q × f = 107 000 GHz (at 14.8 GHz), and τ f = −16 ppm/°C. Spinel-structured Mg(Al 1− x Ga x ) 2 O 4 ( x = 0–1) solid solutions possessed low sintering temperatures, wide temperature regions (~100°C), and small negative τ f values. These outstanding performance make Mg(Al, Ga) 2 O 4 a promising candidate material for millimeter-wave devices.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Zhongli Hu,Hongdong Liu,Haibo Ruan,Rong Hu,Yongyao Su,Lei Zhang
Li 7 La 3 Zr 2 O 12 (LLZO) has cubic garnet type structure and is a promising solid electrolyte for next-generation Li-ion batteries. In this work, Al-doped LLZO was prepared via conventional solid-state reaction. The effects of sintering temperature and Al doping content on the structure and Li-ion conductivity of LLZO were investigated. The phase composition of the products was confirmed to be cubic LLZO via XRD . The morphology and chemical composition of calcined powders were investigated with SEM, EDS , and TEM . The Li-ion conductivity was measured by AC impedance. The results indicated the optimum sintering temperature range is 800–950 °C, the appropriate molar ratio of LiOH·H 2 O, La(OH) 3 , ZrO 2 and Al 2 O 3 is 7.7:3:2:(0.2–0.4), and the Li-ion conductivity of LLZO sintered at 900 °C with 0.3 mol of Al-doped was 2.11×10 −4 S cm −1 at 25 °C.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Xiaojing Bai,Qihuang Deng,Yingjie Qiao,Nianxiang Qiu,Xianhu Zha,Jie Zhou,Kan Luo,Yuhong Zhou,Qing Huang,Shiyu Du
This article presents the theoretical predictions and experimental synthesis of the uranium-containing layered ternary carbides UAl 3 C 3 and U 2 Al 3 C 4 . The electronic structures and mechanical properties of UAl 3 C 3 and U 2 Al 3 C 4 have been investigated by first-principles computations. The chemical bonding characteristics of UAl 3 C 3 and U 2 Al 3 C 4 have been compared to those of nanolaminated ternary carbides and strong interactions have been found between uranium and carbon atoms. Furthermore, UAl 3 C 3 and U 2 Al 3 C 4 powders have been fabricated by the solid state reaction method and the crystal structures of UAl 3 C 3 and U 2 Al 3 C 4 have been determined by X-ray diffraction (XRD). Based on the present results, the layered ternary carbides UAl 3 C 3 and U 2 Al 3 C 4 may provide an expansion of the derivative MAX phase (layered compounds) family as well as a new option for nuclear fuels.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）