JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Aijuan Xie,Feng Tao,Chao Jiang,Wenliang Sun,Yanfang Li,Lina Hu,Xiang Du,Shiping Luo,Chao Yao
The different crystallographic structures of manganese dioxide (α-MnO 2 , β-MnO 2 , γ-MnO 2 and δ-MnO 2 ) were prepared via simple and feasible methods. Among four crystallographic structures, γ-MnO 2 exhibited the best electrochemical property and was chosen to compound γ-MnO 2 /polyaniline (PANI) composite electrode through in situ synthesis techniques. The as-prepared samples were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD). The electrochemical properties of as-prepared samples influenced by the different mass ratios, scan rates, and current densities were mainly investigated by cyclic voltammetry (CV), galvanostatic charge-discharge, electrochemical impedance spectroscopy (EIS), and cycle life, respectively. The results showed that the specific capacitance can be up to 493 F g − 1 as mass ratio of γ-MnO 2 /PANI was 1:5 at current density of 0.5 A g − 1 , suggesting the γ-MnO 2 /PANI (1:5) composite as an electrode material for super capacitors has great development prospects.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2021
·
IF 8.001
Junwei Yao,Xiaobao Xie,Qingshan Shi
In this work, we report that FeCl 3 , a benign Lewis acid, could be used as a catalyst in the γ-valerolactone (GVL)/H 2 O solvent system to facilitate efficient pretreatment of Chinese silvergrass. The results showed that approximately 87.8% of xylan and 75.8% of lignin were removed by 80% GVL under 170 °C using 50 mM FeCl 3 as a catalyst. The solubilized carbohydrate fractions in the pretreatment liquor were mainly composed of monosaccharides (glucose and xylose) rather than oligosaccharides (glucose oligomers and xylose oligomers) and inhibitors (furfural, hydroxymethylfurfural, formic acid and acetic acid). Moreover, FeCl 3 decreased the transesterification of GVL with hydroxyl groups on the cellulose surface and resulted in more easily degraded cellulose. Approximately 96.5% of cellulose and 92.2% of xylan in the pretreated Chinese silvergrass were converted to fermentable monosaccharides by 10 FPU/g cellulases . This study indicated that FeCl 3 -catalyzed GVL solvent could efficiently deconstruct biomass and increase the cellulose digestibility, which provided a novel, GVL-based pretreatment system for processing biomass.
研究领域:
生物化学
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可再生资源与环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ling Zhang,Qi Liu,Yuxin Wang,Chunling Xu,Jiaying Bi,Daobin Mu,Borong Wu,Feng Wu
The practical application of high energy density and cost-effective lithium-sulfur batteries is still impeded by such factors as insulation nature of sulfur/lithium sulfides and poor cycling lifespan. Here, an integrated sulfur-containing cathode (S cathode) with modified γ-MnO 2 as the sulfur host is fabricated to address the capacity decline during cycling. When coupled with pre-lithiation and molybdenum doping, the electronic and ionic conductivity of the modified γ-MnO 2 host is enhanced, which reduces the cycling voltage hysteresis of the S cathode. The modified γ-MnO 2 shows strong chemisorption with the intermediate polysulfides that are generated unavoidably during lithium ions intercalation/deintercalation of a S cathode, and presents role of electrochemical catalysis for discharge/charge process to accelerate the redox kinetics of the polysulfides. Consequently, the prepared S cathode demonstrates highly enhanced performance, with an initial specific capacity of 1441 mAh g −1 at a rate of 0.1C, and a maximum areal capacity of 5.37 mAh cm −2 with sulfur loading of 5.8 mg cm −2 . The cycling stability is superior with a capacity retention of 617.2 mAh g −1 at 2C after 500 cycles, and good rate capability is also achieved. This S cathode offers a potential alternative for high-performance lithium-sulfur batteries.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Changcheng Wei,Jinzhe Li,Zhongmin Liu
The utilization of renewable biomass using γ-valerolactone (GVL) as a platform is a sustainable and important route for the production of valuable chemicals. Herein, the selective transformation of GVL to 1,3-butadiene over zeolite catalysts under ambient pressure and continuous flow conditions was reported. Effects of zeolite topologies, acid density, reaction temperature, and contact time on the GVL conversion were systematically investigated. A 1,3-butadiene selectivity of 71% and GVL conversion of 100% were achieved over the NaZSM-35 catalyst at 400 °C. Further investigations revealed that the GVL-to-butadiene reaction might proceed by the following reaction route: GVL was first converted to pentenoic acid (PEA) and then dehydrated into acylium ions, further converting to 1,3-butadiene by decarbonylation. This work provided a promising route for the sustainable and selective production of 1,3-butadiene from renewable materials.
研究领域:
催化化学
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可再生资源利用
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绿色化学
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产品关联
DOI
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
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2024
·Vol. 24
·期 6
·2309-2317
·
IF 2.8
Mi Na,Yang Min,Wang Xiaohan,Sun Qian,He Jianzhou,Deng Shaopo,Fan Tingting
Purpose The application of silicon could effectively alleviate Cd contamination in the soil. However, the interaction between silicon and Cd in soils is not well understood. Our research aims to investigate the mechanism of the impact of silicate on the sorption of Cd on metal oxides in soils. Materials and methods Sodium silicate and Cd(II) co-sorption on γ-Al 2 O 3 and goethite at pH 5.5 and 7.5 was studied using a combination of batch sorption experiments, X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Results and discussion Silicate enhanced the sorption of Cd(II) onto γ-Al 2 O 3 at pH 5.5 and 7.5. However, the sorption of Cd(II) on goethite at pH 5.5 and 7.5 was only promoted when the silicate concentration reached 1 mmol L −1 . Cadmium(II) enhanced silicate sorption on γ-Al 2 O 3 at pH 5.5 and on goethite at pH 7.5, while it decreased silicate sorption on γ-Al 2 O 3 at pH 7.5 and had no significant effect on goethite at pH 5.5. At pH 5.5, Cd(II) reacted with silicate to generate Cd 2 SiO 4 , and Cd-Si-Al ternary complexes were formed on γ-Al 2 O 3 . At pH 7.5, silicate promoted the formation of Cd(OH) 2 on γ-Al 2 O 3 , which ultimately transformed into CdCO 3 . When silicate concentration reached 1 mmol L −1 , more silicate complexes were formed through the Fe-O-Si bound on goethite at both pH 5.5 and 7.5 to promote the adsorption of Cd(II) owing to its electronegative functional group on the surface of the complex. Conclusions The type of clay minerals, pH, and the presence of silicate all significantly affected Cd sorption. Furthermore, the sorption mechanism of Cd on γ-Al 2 O 3 and goethite in the presence of silicate has been elucidated. The above findings improve our understanding of the mechanism for immobilizing Cd in soils using silicon-containing materials.
研究领域:
土壤科学
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环境化学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2024
·
IF 8.5
Wan-zhen Li,Zi-liang Song,Jun-le Li,Jia-hui Yu,Du-jian Deng,Xiao-qing Cai,Martin J.T. Reaney,Zi-zhe Cai,Yong Wang
Linusorbs (LOs), significantly influence oil quality and sensory properties of flaxseed oil. Trp-containing LOs exhibit distinct oxidative behavior when γ-tocopherol (γ-T) is present. Polar fractions of crude flaxseed oil were stripped via silica absorption, and reintroduced (LO and γ-T) separately into the oil matrix to investigate their interaction during storage. Compared with crude oil, LOs account for 18.49% reduction of p -anisidine value, while LOs with γ-T contributed to most of the endogenous antioxidant effect in crude oil. γ-T was found to suppress oxidation of Trp-containing LO at early stage (Met form), while facilitate oxidation while at their mid-stage (MetO form, Methionine sulfoxide). In vitro oxidation shows that CLD more likely cleaved into peptide fragments, while few products retain intact ring structures. LC-MS/MS analysis and silicon simulation revealed proximity between MetO and Trp residues, facilitating inter- or intra-molecular reactions and ring structure rupture. Remarkably, the presence of γ-T facilitate these phenomena.
研究领域:
食品科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2020
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IF 8.758
Kaikai Wang,Wei Zhang,Xiaohong Zhang,Xiaodan Hu,Shuquan Chang,Haiqian Zhang
It is very important to control the ionizing radiation dose in radiation therapy, which depends on the accurate and rapid measurement of radiation. Herein, a novel and highly sensitive nanosensor for γ-radiation detection is constructed using single-stranded DNA sequences as radiation-sensitive material and gold nanoparticles (AuNPs) as a signal reporter. Well-dispersed AuNPs gradually aggregated at high salt concentration when the sensor was irradiated, and this change was quantified by the visible spectra and surface plasmon resonance spectra. The radiation nanosensor has excellent linearity in the dose range of 0–100 Gy under optimal conditions. This method is simple and fast, which provides a new path for the γ-radiation dosimeter and has potential applications in the assessment of radiation-induced biological effects.
研究领域:
生物医学工程
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放射生物学
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Lixin Kang,Qiufang Liang,Qayum Abdul,Arif Rashid,Xiaofeng Ren,Haile Ma
To prevent food spoilage caused by microbial infection, the development of an environmentally friendly antimicrobial preservation material is crucial. Here, the microporous γ-CD-MOFs was utilized to encapsulate the hydrophobic active substance curcumin, resulting in the preparation of a non-toxic antimicrobial material (Cur-CD-MOFs). The results revealed that curcumin encapsulation in Cur-CD-MOFs occurred primarily in the carbonyl group, benzene ring, and enolic side ring of curcumin. The Cur-CD-MOFs had a 100% bactericidal effect on Escherichia coli and Staphylococcus aureus at 4 h and 8 h, and a strong inhibitory effect on aerial mycelium of Penicillium expansum and Botrytis cinerea . Furthermore, the incorporation of Cur-CD-MOFs improved the Pul/Tre film barrier and mechanical properties. The effectiveness of Cur-CD-MOFs-Pul/Tre in retaining fruit freshness was validated using Centennial Seedless grapes. This study confirmed that Cur-CD-MOFs is a promising antibacterial material, and Cur-CD-MOFs-Pul/Tre will be a potent candidate for food preservation.
研究领域:
食品科学
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生物技术
✓ 已验证
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2020
·Vol. 93
·期 13
·2620-2627
·
IF 0.719
Yanyan Xu,Lu Tianliang,Bu Ningning,Luo Qianqian,Qing Yashi,Lin Li
Abstract Catalytic conversion of biomass based platform chemicals to value added chemicals has attracted much attention recently. In this work, Ni-based catalysts were developed for the conversion of levulinic acid to γ-valerolactone. By investigation of reduction behavior of NiO, it was found that a relatively low reduction temperature (300°C) can provide the reduction of NiO to Ni 0 . The high reduction temperature (500°C) generally applied in literature is not necessary. The effect of supports was also studied, and hierarchical AlPO 4 -5 (AlPO 4 -5-meso) supported Ni showed the best catalytic performance due to the proper pore size of AlPO 4 -5-meso, which contains both micropores and mesopores. The effect of Ni loading was also investigated, 10 wt % of Ni is enough for this reaction, which is lower than the reported amount of Ni loading. By using Ni/AlPO 4 -5-meso with 10 wt % Ni as catalyst, 84% γ-valerolactone yield and 100% levulinic acid conversion can be obtained after reaction for 10 h at 180°C.
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
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2022
·
IF 6.437
Koïta Djakaria,Ziyue Tang,Jingai Shao,Xu Chen,Haoyu Xiao,Joseph Smith,Haiping Yang,Hanping Chen
Furfural is one of the top valuable building block chemicals, the selective production of furfural from biomass has attracted increasing concerns in recent years. In this work, a novel method for the selective production of furfural through cellulose catalytic pyrolysis with WO 3 /γ-Al 2 O 3 was reported, and the synergistic effect between γ-Al 2 O 3 and WO 3 was explored. Compared with cellulose pyrolysis alone, the addition of γ-Al 2 O 3 improved the selectivity of furans and greatly inhibited the formation of sugars; while, WO 3 addition promoted the formation of levoglucosenone . When (20–40%) WO 3 /γ-Al 2 O 3 were added, the amount of sugars was further reduced, and the yields of furans (furfural and 2-methylfuran, in particular) were further increased at the same time. Under the optimum conditions (temperature = 600 °C, residence time = 15 s, and catalyst to cellulose mass ratio of 4), 30%WO 3 /γ-Al 2 O 3 showed the best performance, and the selectivity and yield of furfural were improved by nearly 100% and 300%, respectively, as compared with cellulose pyrolysis alone. In addition, compared with γ-Al 2 O 3 , the addition of 30%WO 3 /γ-Al 2 O 3 further increased the yield of furfural and 2-methylfuran to about 50% and 200%, respectively. The high selectivity and yields of furans with WO 3 /γ-Al 2 O 3 addition might be due to that WO 3 crystals in the composite promote the formation of levoglucosenone, which is further converted to additional furans through the Lewis acid sites of γ-Al 2 O 3 . The study may provide some meaningful advices for improving the production of furfural from green catalytic pyrolysis of cellulose.
研究领域:
化学工程
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Journal of Analytical Methods in Chemistry
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2023
·
IF 2.6
Xiaoyu Yang
Simultaneous enantioseparation of three commonly used chiral antifungal pesticides (diniconazole, hexaconazole, and imazalil) was first studied based on micellar electrokinetic chromatography (MEKC) with hydroxypropyl-γ-CD (HP-γ-CD) as chiral selector. In this study, the importance of experimental parameters such as chiral selector type and concentration, sodium dodecyl sulfate (SDS) concentration, the ratio of methanol, and separation voltage in optimizing were investigated. The simultaneous enantioseparation of diniconazole, hexaconazole, and imazalil was successfully achieved in 30 mM borate buffer (pH 9.0) containing 10 mM HP-γ-CD and 20 mM SDS with methanol (8%) added as organic modifiers. The resolution of diniconazole, hexaconazole, and imazalil was 15.2, 2.12, and 2.78, respectively, and the peak efficiency (N) was over 566,825 plates/m. This study provides an alternative way to systematically separate chiral antifungal pesticides with high efficiency.
研究领域:
分析化学
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农药科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Marine Drugs
·
2017
·Vol. 15
·期 4
·91
·
IF 3.503
Zongrui Tong,Yu Chen,Yang Liu,Li Tong,Jiamian Chu,Kecen Xiao,Zhiyu Zhou,Wenbo Dong,Xingwu Chu
Alginate (Alg) is a renewable polymer with excellent hemostatic properties and biocapability and is widely used for hemostatic wound dressing. However, the swelling properties of alginate-based wound dressings need to be promoted to meet the requirements of wider application. Poly(γ-glutamic acid) (PGA) is a natural polymer with high hydrophility. In the current study, novel Alg/PGA composite microparticles with double network structure were prepared by the emulsification/internal gelation method. It was found from the structure characterization that a double network structure was formed in the composite microparticles due to the ion chelation interaction between Ca2+and the carboxylate groups of Alg and PGA and the electrostatic interaction between the secondary amine group of PGA and the carboxylate groups of Alg and PGA. The swelling behavior of the composite microparticles was significantly improved due to the high hydrophility of PGA. Influences of the preparing conditions on the swelling behavior of the composites were investigated. The porous microparticles could be formed while compositing of PGA. Thermal stability was studied by thermogravimetric analysis method. Moreover, in vitro cytocompatibility test of microparticles exhibited good biocompatibility with L929 cells. All results indicated that such Alg/PGA composite microparticles are a promising candidate in the field of wound dressing for hemostasis or rapid removal of exudates.Keywords:alginate;poly(γ-glutamic acid);emulsification/internal gelation method;microparticle;swelling behavior
研究领域:
生物材料学
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医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）