JOURNAL OF POWER SOURCES
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2018
·
IF 6.945
Hao Zhong,Liuzhang Ouyang,Jiangwen Liu,Chenghong Peng,Xiaoke Zhu,Weiheng Zhu,Fang Fang,Min Zhu
Irreversibility negatively impacts the application of NaBH 4 hydrolysis for hydrogen generation . Byproduct regeneration is key to solving this issue. In this work, the direct byproduct of aqueous NaBH 4 hydrolysis, NaBO 2 ·4H 2 O, is reacted with Mg 2 Si to regenerate NaBH 4 via ball milling at room temperature under an argon atmosphere . In this process, the H − in NaBH 4 is exclusively from the H + in NaBO 2 ·4H 2 O. The regenerated NaBH 4 , with a maximum yield of 74%, has the same physicochemical properties as a commercial sample. We also demonstrate that Mg 2 Si reacts with NaBO 2 ·4H 2 O to generate NaBO 2 ·2H 2 O, followed by a direct reaction between the residual Mg 2 Si and NaBO 2 ·2H 2 O to produce NaBH 4 . The energy efficiency of this method is approximately 40%.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Z.H. Tan,L.Z. Ouyang,J.M. Huang,J.W. Liu,H. Wang,H.Y. Shao,M. Zhu
A convenient, high-density and low-cost hydrogen supply technology is essential to hydrogen energy system by providing hydrogen to fuel cell component. Magnesium silicide (Mg 2 Si) can be a good hydrolysis candidate due to its low cost and ability of releasing hydrogen gas during hydrolysis process. However, previous studies have demonstrated that Mg 2 Si could easily produce large amount of silanes during hydrolysis reaction, which may cause serious problem of explosive danger when in contact with air. Here it is the first time that Mg 2 Si was used for generation of hydrogen by a simple and convenient one-step hydrolysis reaction. In this study, hydrolysis kinetics and mechanisms of Mg 2 Si in NH 4 Cl and NH 4 F solutions were investigated. The silanes could be almost completely turned into hydrogen by introduction of fluorine ion during the hydrolysis reaction of Mg 2 Si, leading to very low silanes content in the produced hydrogen. The kinetic studies indicated that when the concentration of the NH 4 F solution increased to 13.0%, the hydrogen generation rate and the reaction yield were improved significantly and reached the best performance, producing 466 mL g −1 H 2 in 10 min and 616 mL g −1 H 2 in 30 min at 25 °C. The activation energy was calculated to be 37.3 ± 0.8 kJ mol −1 . Furthermore, the hydrogen yield and the hydrolysis rate of Mg 2 Si can be further improved by high-energy ball milling. After ball milling for 2 and 5 h, the hydrogen generation yield in 30 min increased to 698 and 771 mL g −1 , respectively, and the activation energy was decreased to 23.9 ± 0.6 kJ mol −1 and 12.9 ± 0.1 kJ mol −1 , respectively. The results revealed that NH 4 F can be a promising reagent for promoting the hydrolysis of Mg 2 Si for onsite hydrogen supply.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Yonghao Wang,Biao Chi,Chengliang Xiao,Dagui Chen,Yongjing Wang,Minghua Liu
In this work, a layered nanocomposite with a superior adsorption ability has been designed and prepared for the preconcentration of Eu(III), a chemical analogue of trivalent lanthanides [Ln(III)] and actinides [An(III)] in nuclear waste. This nanocomposite was obtained by fabricating magnesium silicate (MgSi) of the Talc-phase Mg 3 Si 4 O 9 (OH) 10 on graphene oxide (GO) nanosheets, in which the GO matrix can effectively avoid the agglomeration of MgSi. A hierarchical structure of GO@MgSi with interwoven nano-sized MgSi lamellae dispersedly standing on the surface of GO was observed by scanning electron microscope (SEM) and transmission electron microscopy (TEM). Such a hierarchical structure effectively increases the surface area of MgSi, leading to up to date the highest adsorption capacity (344.82 mg·L −1 ) for enriching Eu(III). Powder X-ray diffraction pattern (PXRD) of Mg 3 Si 4 O 9 (OH) 10 shows that the (0 2 0) and (2 0 0) diffraction peaks disappear after the adsorption of Eu(III), indicating structural changes in MgSi lamellae after adsorption. The infrared absorption spectra (IR) and X-ray photoelectron spectroscopy (XPS) measurements confirm the structural transformations in the Si O tetrahedral and Mg OH octahedral sheet in MgSi, suggesting that MgSi lamella rather than GO sheet might play a dominant role during the adsorption process. The superior adsorption behaviors of GO@MgSi indicate that it is a highly promising and efficient candidate for Eu(III) preconcentration in aqueous solution.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Jinbo Yang,Min Zhang,Yanwei Zhang,Lei Ding,Jing Zheng,Jingli Xu
This study reports the fabrication of hierarchical magnetic magnesium silicate hollow nanotubes . Owing to its unique structure and high surface area (539.36 m 2 g −1 ), the as-prepared hierarchical magnetic hollow nanotubes exhibit excellent adsorption performance on uptake of methylene blue (MB). Particularly, this strategy can be extended as a general method to prepare other magnetic metal silicate hollow nanotubes.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Materials
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2020
·Vol. 13
·期 17
·3669
·
IF 3.057
Tong Zhang,Jianguo Zhao,Jin Zhang,Shanshan Zhang,Jingwei Li,Shijie Li,Xinyu Li,Jie Zhang
In this study, crumpled graphene balls (CGB), a kind of nano-material, was used as an additive to improve the tribological properties of base oil. Nano-magnesium silicate hydroxide (MSH)/CGB composites were prepared by ultrasound-assisted liquid-phase exfoliation. The loading of MSH significantly increased the number of pleats and reduced the lamellar thickness of CGB. Then, in order to improve the compatibility with the base oil, the MSH/CGB composites were decorated with oleic acid and stearic acid to get modified lipophilic composites (ML-MSH/CGB). The ML-MSH/CGB were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, the tribological properties of the ML-MSH/CGB in base oils were investigated using a ball-on-disc setup tribometer. It indicated that the fantastic tribological behavior of the ML-MSH/CGB in base oil may contribute to a smaller and extremely wrinkled laminated structure. Furthermore, the base oil with 0.005 wt% ML-MSH/CGB composites exhibited the best anti-friction effect, and its average friction coefficient, wearing capacity and wear scar diameter were reduced by 25.4%, 22.1% and 16.7%, respectively. The introduction of ML-MSH/CGB composed materials is an excellent strategy to optimize the friction performance of lubricating oil.Keywords:crumpled graphene balls;magnesium silicate hydroxide;lubricating oil;tribological properties
研究领域:
材料科学
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机械工程
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DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2017
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IF 2.323
Huandong Liu,Zunli Mo,Li Li,Fang Chen,Qijun Wu,Lei Qi
The magnetic magnesium silicate composite (Fe3O4@MgSi) with efficient removal of Cu(II) and malachite green (MG) from aqueous solution were synthesized by hydrothermal approach. The synthetic flower-like particle size was about 2–3 μm. In the process of exploring the adsorption conditions, the isotherms were found to be well-fitted by Langmuir, Freundlich, and isotherm kinetics in accord with the pseudo-second-order model. In addition, the maximum adsorption capacity was 2198 mg·g–1 when the Cu(II) concentration of 800 mg·L–1. These results indicated that Fe3O4@MgSi can be used as a superadsorbent and recyclable adsorbent to effectively and rapidly remove Cu(II) and MG pollutants from industrial wastewater or drinking water.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Bin Wang,Kai Gao,Yujie Wang,Qiuying Chang,He Yang
Magnesium silicate hydroxide (MSH), a self-healing agent at the nanoscale, is a potential novel additive material for lubricating oil. This study explores the impact mechanism of dispersibility and absorptivity on MSH’s anti-wear performance, using experimental research and molecular dynamics simulations. Results show that MSH alone, as an additive to poly-alpha-olefin lubricating oil, does not exhibit anti-wear effect. However, MSH modified by carboxylic acids, including oleic acid, elaidic acid, or stearic acid, reduces the wear by 44.1%, 31.5%, and 21.0%, respectively. This reduced wear is a result of improved dispersibility of MSH and enhanced adsorption on iron interface. Carboxylic acid connects to the hydroxyl groups of the Mg-O/OH tetrahedron through hydrogen bonds and exist in a form where the alkyl chains deviate from the solid interface. In comparison to elaidic acid and stearic acid, oleic acid can form a denser modified layer on the surface of both MSH and iron, resulting in superior dispersibility of MSH in lubricating oil and stronger adsorption on iron surfaces, ultimately leading to better anti-wear performance.
研究领域:
材料科学
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润滑工程
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表面化学
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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2024
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IF 6.2
Xiaofeng Cai,Shuangjian Li,Wei Zeng,Ke Huang,Li Zhao,Dahai Zeng,Xiaohui Tu
The poor dispersion stability and susceptibility to oxidation significantly restrict the practical application of MoS 2 as a lubricant additive. Here, MoS 2 nanocomposite powders with magnesium silicate hydroxide (MSH) reinforcement and amorphous carbon protection were prepared via a straightforward two-step procedure. Detailed studies of the structure, phase composition, tribological properties, and lubrication mechanism of the composite powder have been conducted. The results demonstrated that the morphology of the composite powders was rod-shaped MSH coated with amorphous carbon and layered MoS 2 . The introduction of amorphous carbon into the MSH/MoS 2 composite powders results in enhanced dispersion and a reduction in corrosion to copper sheets. Furthermore, the addition of 1.0 wt% MSH/MoS 2 /C nanoparticles to PAO-6 led to a decrease in the COF of the lubricating oil from 0.104 to 0.063. Meanwhile, the wear rate of the friction pair decreased from 5.91 × 10 −7 mm 3 N −1 m −1 to 2.22 × 10 −7 mm 3 N −1 m −1 . The excellent performance could be attributed to the introduction of amorphous carbon effectively prevents the oxidation of MoS 2 within the additive, leading to improved friction and wear resistance. The tribo-film, composed of MSH, Fe 2 O 3 , FeS, MoS 2 , graphite, and amorphous carbon, demonstrates remarkable capabilities in reducing friction and wear.
研究领域:
材料科学
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摩擦学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2017
·Vol. 41
·期 24
·15601-15611
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IF 3.269
Y. Li,R. Zhao,S. Chao,B. Sun,N. Zhang,J. Qiu,C. Wang,X. Li
Organic cationic herbicides have been widely used in modern agriculture and their discharge into the environment has become a serious problem. In this study, magnesium silicate functionalized PAN (MgSi/PAN) fibers were synthesized using an electrospinning technique and a hydrothermal approach, which were explored as attractive adsorbents for cationic herbicide polluted wastewater treatments. The batch adsorption behavior toward the cationic herbicide diquat by MgSi/PAN fibers was investigated, including effects of pH, adsorption kinetics, adsorption isotherms and ionic strength. It was found that the adsorption isotherm of MgSi/PAN composite fibers was fitted better with the Langmuir isotherm model. The adsorption behaviors showed a maximum adsorption capacity of 197.53 mg g−1 for diquat, which was higher than those of many other adsorbents. Kinetics of the diquat adsorption were found to follow a pseudo-second-order rate equation. Meanwhile, the adsorbent had a good recyclability and the removal efficiency remained at 83% after five adsorption–desorption cycles. Most importantly, the MgSi/PAN fibers could remove 99.1% of diquat by dynamic filtration experiment. These findings demonstrate that the MgSi/PAN fiber membranes could be potentially applied to the efficient removal of diquat in wastewater treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
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2024
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IF 6.1
Duan Chunjian,Xie Shuangshuang,Ye Wenyong,Gao Chuanping,Zhang Shengmao,Zhang Pingyu
In the field of lubrication enhancement, nanomaterials are becoming increasingly important. However, the issue of their stable dispersion in lubrication oil remains a persistent challenge. To address this issue, we synthesized two distinct morphologies of MSH nanomaterials , subsequently modifying them with alkylsilane (OTMS) to enhance their dispersion stability . Particularly, the 1.0 wt% of OTMS-modified laminar MSH (LMSH@OTMS) combined with 0.3 wt% molybdenum dialkyldithiophosphate (MoDTP) exhibited remarkable lubricating performance in PAO10. The result indicate there is a synergistic effect between two components, resulting in the formation of a main sandwich-like tribofilm. The tribofilm is comprised of two distinct layers: a lubricating layer derived from MoDTP and an anti-wear layer stemming from LMSH@OTMS. These findings offer significant potential for enhancing durability of mechanical systems .
研究领域:
材料科学
·
润滑工程
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产品关联
DOI
高影响因子
ACS Nano
·
2018
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IF 13.709
Yongling An,Huifang Fei,Guifang Zeng,Lijie Ci,Shenglin Xiong,Jinkui Feng,Yitai Qian
Silicon is considered as one of the most favorable anode materials for next-generation lithium-ion batteries. Nanoporous silicon is synthesized via a green, facile, and controllable vacuum distillation method from the commercial Mg2Si alloy. Nanoporous silicon is formed by the evaporation of low boiling point Mg. In this method, the magnesium metal from the Mg2Si alloy can be recycled. The pore sizes of nanoporous silicon can be secured by adjusting the distillated temperature and time. The optimized nanoporous silicon (800 °C, 0.5 h) delivers a discharge capacity of 2034 mA h g–1 at 200 mA g–1 for 100 cycles, a cycling stability with more than 1180 mA h g–1 even after 400 cycles at 1000 mA g–1, and a rate capability of 855 mA h g–1 at 5000 mA g–1. The electrochemical properties might be ascribed to its porous structure, which may accommodate large volume change during the cycling process. These results suggest that the green, scalable, and controllable approach may offer a pathway for the commercialization of high-performance Si anodes. This method may also be extended to construct other nanoporous materials.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Cai Wu,Chun Shen,Yahui Gong,Jie Wang
The shortage of fossil resources and strict environmental regulations have ignited great efforts in the production of bio-based fuels and chemicals via biorefinery. Herein, considering the strong interaction between Ni and Mg species, we specially designed and prepared Ni/CaMgO and Ni/MgSiO for alkylation and hydrodeoxygenation (HDO) reactions during the upgrading of the acetone–butanol–ethanol (ABE) fermentation mixture. Gratifyingly, the Mg-decorated catalysts exhibited great catalytic performance: a selectivity of 63.9% under a conversion of 94.2% was achieved for C8–C15 ketones and alcohols, which is higher than that over other heterogeneous alkali-based catalysts, and the obtained mixture was completely converted into the corresponding alkanes at 190 °C (H2 pressure: 1 MPa). It is worth noting that jet fuels or gasoline could be efficiently and selectively obtained by facile adjustment of the composition of the ABE fermentation product. Moreover, investigation on the structure–activity correlation confirmed that the outstanding activity of Ni/MgSiO for HDO could be attributed to the synergic catalysis between Ni0 and strong acid sites. The Ni/CaMgO and Ni/MgSiO catalysts reported in this work offer three advantages: selectively upgrading zymotic biomass wastes into biofuels, replacing the expensive noble metal (Pd) by the base metal (Ni), and realizing the HDO process under mild conditions and complying with the principles of “green chemistry”. Overall, this work opens a new possibility for biofuel production, which is conductive to the rational design and implementation of highly active heterogeneous catalysts.
研究领域:
生物化学
·
催化化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）