JOURNAL OF POWER SOURCES
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2013
·
IF 4.675
Pengran Gao,Weixin Lv,Rui Zhang,Yi Liu,Guanghua Li,Xianfu Bu,Lixu Lei
We have developed a novel route to make new batteries from spent ones, in which we obtain and regenerate the active materials of positive electrode and negative electrode respectively. For the spent lead acid batteries , the positive electrode active materials contain both PbSO 4 and PbO 2 . To make full use of them, we have to investigate the treatment of the mixtures rather than only PbO 2 , which we have reported previously. Here we report our investigation on three mixtures of PbSO 4 and PbO 2 in different mole ratios, as well as the electrode materials directly from the spent batteries. The mixtures are firstly desulphated, and then solvothermally processed in methanol at 140 °C for 24 h. The as-obtained solids contain both PbO·PbCO 3 and PbCO 3 , which have been calcined to form α-PbO. The α-PbO powders are similar irregular particles and highly electrochemically active, which discharge around 170 mAh g −1 at 5 mA g −1 , 80 mAh g −1 at 200 mA g −1 and 60 mAh g −1 at 400 mA g −1 with excellent cyclic stability in 50 cycles.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Weida Shi,Zhihao Jin,Juanjuan Wen,Xianfu Chen,Kaiyun Fu,Xiaowei Da,Minghui Qiu,Yiqun Fan
The development of tight ceramic ultrafiltration membranes for water purification facilitates is challenging because of high fabrication costs and low permeate flux . In this study, a low-energy rapid thermal process (RTP) was comprehensively investigated for fabricating of high-precision, permeable α-alumina tight ultrafiltration membranes. Compared to the conventional thermal process (CTP), RTP offers an ultra-fast heating rate and shorter holding time, effectively mitigating grain growth and pore aggregation. Moreover, the decomposition of organic matter is delayed during RTP, providing a lower interfacial energy that enables direct formation of α-alumina at a low temperature of 750 °C. During a secondary subsequent RTP, the residual phase is fully converted to α-alumina by the in-situ seeding effect. By utilizing RTP, we successfully prepared α-alumina ultrafiltration membranes within 30 min by calcination , with an average pore size of approximately 6 nm, a narrow pore distribution coefficient of 1.12, and high permeance of 219 L −1 ·m −2 ·h −1 ·bar −1 .
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Lu Chen,Zhengkai Wu,Xueying Cheng,Shuyu Chen,Jiaxin Zhao,Hang Li,Yingna Guo,Qingkun Shang
In this paper, Bi 4 O 5 I 2 /α-Bi 2 O 3 composite photocatalysts were successfully prepared by loading Bi 4 O 5 I 2 nanosheets on the surface of α-Bi 2 O 3 nanorods. The photocatalytic performance was investigated for the degradation of propranolol under visible light. Bi 4 O 5 I 2 /α-Bi 2 O 3 (30) could degrade 95 % of propranolol within 120 min, and the degradation rates of propranolol were 64.3 and 2.68 times that of α-Bi 2 O 3 and Bi 4 O 5 I 2 , respectively. The mineralization degree of propranolol reached 54.7 %, which was also much higher than that of Bi 4 O 5 I 2 and α-Bi 2 O 3 alone. Based on the results of high-resolution mass spectrometry (HRMS), the possible degradation pathways and products of propranolol were proposed, and the environmental toxicity of the degradation products was evaluated. The formation mechanism of Bi 4 O 5 I 2 /α-Bi 2 O 3 Z-type heterojunction was proposed by investigating the band structure and photoelectric properties of the composite photocatalyst. This work provides a successful example for the construction and application of new heterojunction photocatalysts.
研究领域:
环境科学
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材料科学
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药学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2024
·
IF 4.7
Cong Wang,Gang Li,Zheng Huang,Anfeng Peng
Alkyl-aluminum, which is sensitive to air, has been a major obstacle to the development of ethylene oligomerization. Herein, LiAlH 4 is used as an effective alkyl-aluminum substitute. The performance of LiAlH 4 itself in the reaction is investigated, proving that it possesses moderate activity. Further addition of Versailles/Santa Barbara-1 (VSB-1) catalysts with different morphologies can effectively improve the reaction, in which VSB-1/LiAlH 4 presents the activity of 32.1 g ‧ g LiAlH4 −1 ·h −1 (154.1 g ‧ g VSB-1 −1 ‧h −1 ) and the selectivity of 1-butene, 1-hexene and 1-octene in all products could reach 51.4 %, 18.9 % and 7.9 %, respectively. The co-catalytic system is stable and the VSB-1 catalyst therein can be effectively reused at least three times under the suitable treatment conditions. In addition, the product analysis of the co-catalyzed system reveals that the addition of VSB-1 catalyst tended to produce 1-butene, 1-hexene and 1-octene at 20 bar. Based on above result, a possible reaction mechanism is proposed.
研究领域:
化学工程
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2019
·Vol. 35
·期 2
·319-324
·
IF 1.071
Wang Junlin,Yi Yongjie,Li Mengjia,Chang Yue,Zha Fei
Graphitic carbon nitride(g-C 3 N 4 ) microspheres supported α-FeO(OH) hybrids[α-FeO(OH)/g-C 3 N 4 ] were prepared by means of a self-assembly method in deionized water. By UV-visible diffuse reflectance spectroscopy, it has been confirmed that α-FeO(OH)/g-C 3 N 4 has a wider absorption range than g-C 3 N 4 . The feature of α-FeO(OH)/g-C 3 N 4 can be attributed to the efficient separation of the electron-hole pairs with photoluminescence spectra. The degradation rate of methyl orange(MO) is up to 99% under the optimal conditions of 110 min, initial concentration of 30 mg/L, an α-FeO(OH)/g-C 3 N 4 dosage of 15 mg as well as visible light. The mechanism for this photocatalytic reaction was proposed, with hydroxyl radicals being a major active catalytic species.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2016
·Vol. 7
·期 47
·7216-7222
·
IF 5.687
Yan Li,Cheng Chen,Jinlong Wu,Xiangxiang Jia,Yufan Lu,Fangjuan Chen,Lijian Liu
Copolymerization between alkyl diazoacetates and α,β-unsaturated aldehydes, which is a one-pot, one-step and catalyst-free reaction, is presented. The product is a ternary copolymer composed of an alkyl diazoacetate, an α,β-unsaturated aldehyde and an α-carbalkoxy carbene, which is derived from the alkyl diazoacetate by the release of N2. Thus, the reaction is named as the C1N2/C2/C1 copolymerization. Various diazoacetates and α,β-unsaturated aldehydes were utilized to establish the methodology. The products are down-/up-conversion fluorescence molecules that can significantly enhance cell imaging through the synchronized excitation of near-ultraviolet and near-infrared light and may be widely used in other optical fields. The up-conversion fluorescence is the result of a two-photon excitation process.
研究领域:
有机化学
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材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2018
·
IF 5.914
Zhitao Hu,Yi Chen,Huahua Huang,Lixin Liu,Yongming Chen
This article demonstrates the synthesis of a new kind of cationic poly(δ-valerolactone) with primary amino groups at α-positions (poly(α-NH2-VL)) via ring-opening polymerization (ROP) of α-NHBoc-valerolactone (α-NHB-VL) followed by a simple deprotection reaction. The ROP of α-NHB-VL using benzyl alcohol as an initiator and DBU/TU (1,8-diazabicyclo[5.4.0]undec-7-ene/thiourea) as a catalytic system in THF at room temperature afforded poly(α-NHB-VL) with narrow molecular weight distribution. The 1H NMR and MALDI-TOF MS analysis of poly(α-NHB-VL) indicated that each polymeric chain was capped by the initiator. Kinetic experiments confirmed the living nature of the DBU/TU-catalyzed ROP of α-NHB-VL in THF. The copolymerization result indicated that the polymerization activity of α-NHB-VL is comparable to that of ε-caprolactone (CL) and VL. In addition, block copolymers containing poly(α-NHB-VL) were successfully synthesized regardless of whether hydrophilic PEG or hydrophobic PCL was used as the macroinitiator. Moreover, water-soluble poly(α-NH2-VL) was obtained by treatment with trifluoroacetic acid (TFA). It was found that poly(α-NH2-VL) degraded more slowly at pH 5.5 than at pH 7.4 through a hydrolysis kinetics study.
研究领域:
高分子化学
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材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2016
·Vol. 6
·期 20
·7429-7436
·
IF 5.287
Xiuquan Jia,Jiping Ma,Min Wang,Xiaofang Li,Jin Gao,Jie Xu
The tandem reaction is a growing field to yield important advances toward green and sustainable chemistry. Herein, we report a bifunctional manganese oxide catalyst with an interface binding redox phase (α-MnO2) and a basic phase (NaxMnO2). The molar ratio of NaOH/Mn plays a great role in the formation of α-MnO2/NaxMnO2. The sodium cation is essential for the formation of a basic NaxMnO2 phase while the potassium cation promotes the formation of a redox-active α-MnO2 phase. The interface structure of α-MnO2/NaxMnO2 geometrically favors the ammoxidation–Pinner tandem reaction to synthesize imidates in a 58–96% yield from aldehydes. Thus a phase collaborative effect is observed. In the ammoxidation process, the redox cycle of MnIV/MnIII is involved and the lattice oxygen in the α-MnO2 phase acts as an active oxygen species. The O–H in methanol is activated and dissociated on the basic sites of NaxMnO2 to the adsorbed methoxyl species to facilitate the Pinner synthesis. This approach bypasses the conventional synthesis of imidates, which suffer from harsh reaction conditions and the requirement for multiple steps.
研究领域:
催化化学
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材料科学
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有机合成
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2024
·
IF 6.5
Peng Zhang,Fangfang Li,Xuefang Yao,Pengze Zhang,Yukai Wu,Mengmeng Xi,Fanhui Meng,Lihua Kang,Mingyuan Zhu
The GaZrO x solid solution has been recently employed in OX-ZEO bifunctional catalysts for efficient conversion of syngas to light olefins, but it remains challenging to identify the specific contributions of Zr and Ga and to understand the detailed reaction mechanisms due to the structural complexity. To address this complexity and elucidate the active sites over the Zr-Ga oxide system, this study presents a catalyst designed by physical mixing ZrO 2 with different crystalline phases ( m -ZrO 2 & t -ZrO 2 ) and α -Ga 2 O 3 . The physical mixture of m -ZrO 2 and α -Ga 2 O 3 achieves a high CO conversion of 39.1 %, with light olefins selectivity of 87.3% among hydrocarbons after combined with SAPO-34, surpassing the performance of physical mixture of t -ZrO 2 and/or α -Ga 2 O 3 with SAPO-34. Combining the various characterizations and DFT calculations, we have confirmed that m -ZrO 2 site, enriched with oxygen vacancies and surface hydroxyl groups, is essential for CO adsorption and HCOO* intermediate formation, while the α -Ga 2 O 3 site plays a key role in the dissociation of H 2 . Furthermore, the electron transfer from m -ZrO 2 to α -Ga 2 O 3 in their mixture is more efficient than in a physically mixed t -ZrO 2 and α -Ga 2 O 3 . This accelerates the H 2 dissociation and boosts the spillover of hydrogen from α -Ga 2 O 3 to m -ZrO 2 , leading to the formation of more CH 3 O* intermediates and higher light olefins yield when combined with SAPO-34.
研究领域:
催化化学
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材料科学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Hua Liu,Zumin Wang,Haiyan Li,Hao Wang,Ranbo Yu
Industrial wastewater containing both organic and inorganic pollutants is being generated all the time. Efficient materials are highly needed to purify the polluted water. Thus, a hierarchical structured α-Fe 2 O 3 with excellent adsorptive property has been synthesized by using a facile hydrothermal method. It can be prepared in macroscopic quantity. The as-synthesized α-Fe 2 O 3 with silkworm cocoon-like morphology shows high efficiency in adsorbing Congo red (CR), Methyl orange (MO) and Cr(VI). The removal efficiency of CR, MO and Cr(VI) can reach 99.2%, 83.9% and 100% under appropriate conditions. Besides, this α-Fe 2 O 3 shows high adsorptive ability for mixed CR and Cr(VI) in aqueous solution and the final removal rates can reach 94.7% and 97.9%, respectively. The adsorption kinetics fits well with the pseudo-second-order kinetic model. The results indicate that the product may find potential application in purification of wastewater containing both organic and inorganic pollutants.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
FITOTERAPIA
·
2019
·
IF 2.431
Rui Li,Qing Wang,Menghao Zhao,Peiming Yang,Xiao Hu,Danwei Ouyang
Hippophae rhamnoides subsp. Sinensis is a famous traditional medicinal plant in Tibet and Mongolia of China. Three novel flavonoid glycosides and ten known analogues were obtained from the seeds of H. rhamnoides . The structures of new compounds were elucidated by spectroscopics, chemical methods as well as literature data. In vitro assay, compounds 5–9 , kaempferol and 70% ethanolic elution fraction showed prominent α -glucosidase inhibitory activities with IC 50 values ranging from 8.30 to 112.11 μM, better than that of the positive control, acarbose , whose IC 50 value was 1727.07 μM.
研究领域:
植物化学
·
药理学
✓ 已验证
DOI
高影响因子
ANALYTICAL LETTERS
·
2025
·
IF 1.8
Long Chen,Jianglong Du,Xiaopeng Peng,Jiacheng Ye,Keqi Ye,Yinghua Yan,Chuan-Fan Ding
The identification and separation of isomers are of great significance due to the distinct physicochemical properties and wide-ranging applications. In this study, a simple and rapid method based on ion mobility spectrometry (IMS) was developed to distinguish and relatively quantify the 2,5/3,5-lutidine (2,5/3,5-LUT) isomers. Initially, the two isomers were separated through complexation with α-, β-, and γ-cyclodextrins (CDs), with a slight inter-peak resolution observed in the formation of the [CD+LUT+H]+ complexes. To enhance the differentiation, metal ions (Mn2+, Fe2+, Co2+, Zn2+) were introduced to form ternary complexes, and α-CD in coordination with Zn2+ yielded the most effective separation of 2,5/3,5-LUT. Theoretical conformations of [α-CD + 2,5/3,5-LUT+H]+ and [α-CD + 2,5/3,5-LUT+Zn-H]+ were optimized. Furthermore, collision-induced dissociation (CID) analysis of the [α-CD + 2,5/3,5-LUT+Zn-H]+ complexes revealed that the dissociation energy varies due to different spatial conformations. Finally, the method demonstrated reliable relative quantification, achieving a satisfactory linear correlation (R2>0.99). The developed approach offers a simple, precise, and cost-effective strategy for isomer identification and conformational analysis, with potential applications in chemical and pharmacological fields.
研究领域:
分析化学
·
药物化学
✓ 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）