INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Chenglei Qin,Liuzhang Ouyang,Hui Wang,Jiangwen Liu,Huaiyu Shao,Min Zhu
Sodium borohydride (NaBH 4 ) is considered to be an excellent hydrogen-generation material via hydrolysis. However, it remains challenge to regenerate it after hydrolysis in practical applications. Therefore, a low-cost regeneration method from hydrolysis by-products for recycling is the key issue. In this study, NaBH 4 was successfully regenerated by direct high-energy ball milling of magnesium alloy (Mg 17 Al 12 ) and hydrolysis by-product NaBO 2 ·2H 2 O with addition of a small amount of NaH. Notably, unlike traditional method, here there is no need of adding extra hydrogen and the H − in the regenerated NaBH 4 is mainly from the H + in the coordinated water. It was found that through adding a small amount of NaH, the highest yield may reach 57% after optimizing the regeneration process. In addition, it is the first time we found that not only Mg can participate in the reaction, but also Al; and the addition of NaH can promote the reaction. Furthermore, the regeneration mechanism of NaBH 4 was analyzed and the transition pattern [B(OH) 4 ] − /[BH 3 (OH)] − /[BH 4 ] − was successfully observed during the regeneration process. It is worth emphasizing that NaBH 4 can be regenerated through ball milling method, which is energy-saving and suitable for up-scaling in the future.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2018
·
IF 13.12
Zhi-Hao Zhao,Xu-Dong Hu,Hongqiang Wang,Meng-Yang Ye,Zhi-Yuan Sang,Hui-Ming Ji,Xiao-Lei Li,Yejing Dai
Rational design of electrode materials for sodium-ion batteries with high flexibility is still challenging. Here, superelastic 3D few-layer MoS 2 /carbon framework heterogeneous electrodes (abbreviated as, MoS 2 @C F ) are fabricated by a simple vacuum infiltration and heating process. The interconnected ultrathin MoS 2 network filled with carbon framework forms a 3D heterogeneous network with hierarchical pore structure . The unique structure of the electrodes results in excellent mechanical and electrochemical performances. The MoS 2 @C F electrodes exhibit superior elasticity and recoverability. After 180° bending repeatedly, the electrodes still can recover their initial sizes. Moreover, the electrodes show outstanding cycling stabilities with high reversible capacities reaching up 240 mA h g −1 after 500 cycles at 1 A g −1 (capacity retention of ~ 99%). Full-cells assembled with MoS 2 @C F anodes and Na 3 V 2 (PO 4 ) 3 cathodes show high reversible capacity (~ 252 mA h g −1 at 0.5 A g −1 ). Overall, the superior mechanical properties and high electrochemical performances indicate the promising potential of MoS 2 @C F electrodes in large-scale flexible sodium-ion storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 166
·期 3
·A5075
·
IF 3.662
Bizhe Su,Jiaolong Zhang,Manabu Fujita,Wenchong Zhou,Patrick H.-L. Sit,Denis Y. W. Yu
Recent experimental and theoretical studies on the family of Li-rich layered materials show that they can deliver much higher capacities than traditional Li-transitional metal oxides. This also leads to great interests in Na-rich layered oxides as alternative positive electrode materials for sodium-ion batteries for large-scale energy storage. Herein, we report a Na-rich material, Na2SeO3 with an unconventional layered structure as a positive electrode material in NIBs for the first time. This material can deliver a discharge capacity of 232 mAh g−1 after activation, one of the highest capacities from sodium-based positive electrode materials. X-ray photoelectron spectroscopy indicates the oxidation state of selenium remains unchanged during the charge process. Theoretical simulation shows that after removal of Na, spin is situated around oxygen atoms near the Na vacancy, and the projected density of state of oxygen electron is close to the Fermi level. These suggest the involvement of oxygen during charge-discharge. This work will propel new searches of high-capacity sodium-based positive electrode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Mingliang Pei,Xu Jia,Xubo Zhao,Jiagen Li,Peng Liu
Alginate-based cancer-associated, stimuli-driven and turn-on theranostic prodrug nanogels were designed for the tumor diagnosis and chemotherapy, by crosslinking the folate-terminated poly(ethylene glycol) (FA-PEG-NH 2 ) and rhodamine B (RhB)-terminated poly(ethylene glycol) (RhB-PEG-NH 2 ) modified oxidized alginate (OAL- g -PEG-FA/RhB) with cystamine (Cys), followed covalent conjugation of doxorubicin (DOX) via acid-labile Schiff base bond. Owing to the surface folic acid (FA) groups, disulfide crosslinking structure and Schiff base conjugation for DOX , the folate receptor (FR)-mediated targeting and pH/reduction dual responsive intracellular triggered release of DOX was achieved. The cytotoxicity and cellular uptake results clearly illustrated that most DOX was released and accumulated in the cell nuclei and killed the cancer cells efficaciously, due to the desirable targeting intracellular triggered release. Furthermore, the theranostic nanogels could be used for the real-time and noninvasive location tracking to cancer cells, owing to the pH-modulated fluorescence property of the pendant RhB groups.
研究领域:
药剂学
·
肿瘤学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Materials Today Sustainability
·
2022
·
IF 7.244
J. Liang,Z. Wang,Q. Ye,L. Qiao,H. Jiang,Y. Guo,Z. Fan
Melt-blown fabric masks have the drawbacks of the supply-demand imbalance, the risks of respirable infection, and environmental pollution . Therefore, it is urgently needed to exploit a new mask material with excellent air-filtration, antimicrobial, and degradable properties. In this study, a new sodium alginate (SA)/nanosilver composite mask intermediate filter layer (named as SAg air filter) is prepared by a simple and quantifiable pumping-injecting method to substitute the traditional melt-blown fabric. Subsequently, the prepared SAg air filter is softened with glycerol solution to improve the flexibility. Compared with the intermediate filter layer of the melt-blown fabric mask, the SAg air filter has more excellent performances, such as environmental friendliness, degradability , large-scale preparation, stable and long-lasting air filtration , good impermeability, as well as suitable breathability. What's more, the air filter combines physical and mechanical filtration, Coulomb adsorption of nano-silver, and antimicrobial air purification through the SAg aerogel network to ensure more comprehensive air purification and filtration. The novel SAg air filter will have a broad application prospect in the mask market, and eventually extend the new application of SA aerogel in the air filtration field.
研究领域:
材料科学
·
医学
·
环境科学
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Yingjuan Sun,Jiefeng Zheng,Yang Yang,Jianhao Zhao,Jianhua Rong,Hongyan Li,Li Niu
We reports an all-conductive polymers composite with cross-linking network structures composed of porous polyaniline (PANi) and PEDOT:PSS. This composite with unique structures and morphological properties has the ability to be utilized as cathode for sodium ion batteries (SIBs). Specifically, the cathode delivers a high reversible capacity of 81.9 mA h g −1 at a current density of 100 mA g −1 and represents outstanding cycle stability. Remarkably, the PANi-PEDOT cathode exhibits a high performance compared with state of the art performance of cathode materials for SIBs, for instance, Na 2 Fe 2 (SO 4 ) 3 , Na 0·6 Cr 0·6 Ti 0·4 O 2 and Na 2 MnP 2 O 7 . Moreover, the kinetics analysis of cyclic voltammetry represents predominant capacitive process, which plays dominant roles in charge storage. These conductive cross-linking networks structures and high stability endow the cathode good electrical conductivity and play important roles in the cycling stability of the Na ion cathode, thus promoting the electrochemical performances of the cathode, offering a great promise in SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
FirePhysChem
·
2023
·
IF 0
Xinyi Li,Yuangang Xu,Jianxin Zhou,Tianyang Hou,Ze Xu,Pengcheng Wang,Ming Lu
As an important intermediate in the synthesis of most energetic pentazole compounds, the reaction system of sodium pentazole is complex and has many by-products, but there is no suitable HPLC analysis method. Based on the study of ultraviolet absorption peak of sodium pentazole aqueous solution, the HPLC purity analysis method of sodium pentazole was successfully established and its sensitivity, accuracy and repeatability were verified. When the detection wavelength was 192 nm, the chromatographic column was Agilent WondaSil C18 Superb (4.6 × 250 mm, 5 μm), the mobile phase was 95% water and 5% acetonitrile mixed solution, the flow rate was 0.8 ml/min, the analysis time was 8 min, the sample size was 1 μL and the column temperature was 40 °C, a liquid phase map of sodium pentazole was obtained. The analysis results showed that the retention time of pentazole sodium was 3.76 min, and showed a good linear relationship in the range of 0.3068–0.3288 g/L. The linear equation is y = -217447.64+835837.85 x , the correlation coefficient R 2 is 0.99997, and it has good sensitivity, accuracy and repeatability. In addition, three by-products from the synthesis of sodium pentazole were simply separated.
研究领域:
分析化学
·
有机合成
✓ 已验证
DOI
Food Science & Nutrition
·
2022
·Vol. 10
·期 9
·3098-3105
·
IF 3.553
Yongmin Wu,Yi Wu,Peng Han,Jiangqi Xu,Xiaobo Liang
The effects of edible coatings based on sodium alginate with ʻBaozhuʼ pear chitinase on the quality of cherry tomatoes during refrigerated storage were evaluated. Cherry tomatoes inoculated with Fusarium oxysporum were coated and stored up to 21 days. All coatings with the chitinase significantly reduced F . oxysporum proliferation on cherry tomatoes during storage and extended the shelf life of cherry tomatoes effectively ( p < .05). Results showed that alginate coatings with the chitinase could prevent weight loss, maintain firmness, and slow down the changes of titratable acidity and vitamin C ( p < .05) in a dose-dependent manner. However, no significant differences were observed between T3 (1% alginate/0.15% ʻBaozhuʼ pear chitinase/1% glycerin) and T4 (1% sodium alginate/0.3% ʻBaozhuʼ pear chitinase/1% glycerin) ( p > .05). Overall, alginate coating with 0.15% ʻBaozhuʼ pear chitinase could be a promising method to maintain the quality of cherry tomatoes.
研究领域:
食品科学
·
植物病理学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Jiaming Hu,Shuai Zhang,Chen Feng,Shanggeng Li,Longfei Zhang,Jiajun Ma,Qiang Yin
In this work, an efficient Fe 3+ adsorbent was synthesized by using the tryptamine and sodium carboxymethyl cellulose (CMC-Na) modified polyacrylamide gel. The functional monomers synthesized by the reaction of tryptamine and methacrylic acid chloride were doped into the composition, and CMC-Na participated in the formation of the gel network. By changing different conditions, the optimal use conditions of the gel were explored. The Langmuir and Freundlich isotherm models were used to discuss the adsorption behavior. According to the fitting results, the Freundlich model was more suitable for explaining the adsorption of Fe 3+ by gels. The feasibility of its adsorption process was confirmed by the study of its kinetics and thermodynamics. As an adsorbent, tryptamine CMC-Na modified polyacrylamide gel has excellent ability to remove Fe 3+ from aqueous solutions. The maximum adsorption capacity of tryptamine and CMC-Na modified polyacrylamide gel for Fe 3+ reached 127.5 mg g −1 .
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of the Iranian Chemical Society
·
2023
·
IF 2.4
Fu Qiuping,Hu Jing,Zhou Shaoqi
Graphene oxide@sodium alginate (GO@SA) composites were prepared by combining graphene oxide (GO) with sodium alginate (SA) for adsorption of Pb(II). Fourier-transform infrared spectra (FT-IR) and field emission scanning electron microscopy (FESEM) were used to characterize the structure and morphology of the composites. And the adsorption performance of Pb(II) by GO@SA was studied. The adsorption capacity of Pb(II) by GO@SA increased with the increase of pH and temperature. The adsorption process was consistent with the Langmuir isothermal adsorption model and quasi-second-order kinetic model, and the adsorption process was spontaneous and endothermic. At 303.15 K, the maximum adsorption capacity fitted by the Langmuir isothermal model was 241.5 mg/g.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2024
·Vol. 11
·期 22
·2400190
·
IF 4.3
Junhua Zhou,Huimin Hu,Jiaqi Wang,Qitao Shi,Xueyu Lian,Lijun Liu,Alicja Bachmatiuk,Jingyu Sun,Ruizhi Yang,Jin-Ho Choi,Mark H. Rümmeli
Sodium layered oxide with anion redox activity (SLO-A) stands out as a promising cathode material for sodium-ion batteries due to its impressive capacity and high voltage resulting from Mn- and O-redox processes. However, the SLO-A faces significant challenges in cycling stability and rate performance, primarily due to the poor reversibility and sluggish kinetics of the O-redox. In this study,a novel Ti-doped material, Na 2/3 Li 2/9 Mn 53/72 Ti 1/24 O 2 (NLMTO), exhibiting remarkable characteristics such as a notable rate capacity (130 mAh g −1 at 3C, where 1C equals 200 mA g −1 ) and excellent cycling retention (85.4% after 100 cycles at 0.5C) is introduced. Employing electrochemical differential analyses, the contributions to the superior performance arising from the Mn- and O-redox processes are quantitatively delineated. The optimized performance of NLMTO is attributed, in part, to the enhanced stability of both bulk and interface structures. The introduction of Ti through substitution not only contributes to this stability but also allows for the fine-tuning of the material's electron configurations. This is achieved by augmenting the density of states near the Fermi energy level, as well as elevating the O 2p and Mn 3d orbits. This research advances sodium-ion battery technology.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2016
·
IF 4.556
Liping Feng,Yanping Cao,Duoxia Xu,Sasa You,Fu Han
The aim of the study was to investigate the impact of sodium alginate (ALG) pretreated by ultrasound on the enzyme activity, structure, conformation and molecular weight and distribution of papain. ALG solutions were pretreated with ultrasound at varying power (0.05, 0.15, 0.25, 0.35, 0.45 W/cm 2 ), 135 kHz, 50 °C for 20 min. The maximum relative activity of papain increased by 10.53% when mixed with ALG pretreated by ultrasound at 0.25 W/cm 2 , compared with the untreated ALG. The influence of ultrasound pretreated ALG on the conformation and secondary structure of papain were assessed by fluorescence spectroscopy and circular dichroism spectroscopy. The fluorescence spectra revealed that ultrasound pretreated ALG increased the number of tryptophan on papain surface, especially at 0.25 W/cm 2 . It indicated that ultrasound pretreatment induced molecular unfolding, causing the exposure of more hydrophobic groups and regions from inside to the outside of the papain molecules. Furthermore, ultrasound pretreated ALG resulted in minor changes in the secondary structure of the papain. The content of α-helix was slightly increased after ultrasound pretreatment and no significant change was observed at different ultrasound powers. ALG pretreated by ultrasound enhanced the stability of the secondary structure of papain, especially at 0.25 W/cm 2 . The free sulfhydryl (SH) content of papain was slightly increased and then decreased with the increase of ultrasonic power. The maximum content of free SH was observed at 0.25 W/cm 2 , under which the content of the free SH increased by 6.36% compared with the untreated ALG. Dynamic light scattering showed that the effect of ultrasound treatment was mainly the homogenization of the ALG particles in the mixed dispersion. The gel permeation chromatography coupled with the multi-angle laser light scattering photometer analysis showed that the molecular weight ( M w ) of papain/ALG was decreased and then increased with the ultrasonic pretreatment. Results demonstrated that the activity of immobilized papain improved by ultrasonic pretreatment was mainly caused by the variation of the conformation of papain and the effect of interactions between papain and ALG. This study is important to explain the intermolecular interactions of biopolymers and the mechanism of enzyme immobilization treated by ultrasound in improving the enzymatic activity. As expected, ALG pretreated by appropriate ultrasound is promising as a bioactive compound carrier in the field of immobilized enzyme.
研究领域:
生物化学
·
酶工程
·
食品科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）