SN Applied Sciences
·
2020
·Vol. 2
·期 3
·1-10
·
IF 0
Sun Xueying,Liu Xinjie,Wang Jie,Jiang Xusheng,Liu Rongmei,Li Anran,Li Wen
In this work, we first successfully loaded the MOF structure Co-HKUST nanobundles on a foamed nickel without adding any binder. The Co-HKUST is a pseudo-capacitive material with excellent electrochemical performance as a unique energy storage material. As an electro-active material, such cobalt-based MOF exhibits superior pseudo-capacitive behavior in the KOH aqueous electrolyte with a high specific capacitance of 578.6 F g −1 at 1 A g −1 , and the specific capacitance remains 452.3 F g −1 when the current density increased to 10 A g −1 with a good rate performance (78.2%). Meanwhile, the cycle retention rate of the Co-HKUST is 88.7% after 1000 cycles at 7.5 A g −1 . The two-electrode asymmetric supercapacitor (ASC) device is also assembled in this work. The specific capacitance of Co-HKUST//AC ASC is 200.5 F g −1 at 1 A g −1 . Though 5000 cycles at 5 A g −1 , only 8.2% of the capacitance is lost. Energy density of asymmetric Co-HKUST//AC device can reach 71.35 Wh kg −1 at 1 A g −1 with a power of 809.9 W kg −1 . More interestingly, even if the current density increased to 10 A g −1 , the energy density maintains 44 Wh kg −1 at power density of 8.5 kW kg −1 . The above test results can fully show that the synthesized Co-HKUST material is a promising energy storage material.
✓ 已验证
DOI
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 2
·1-10
·
IF 6.232
Zhang Lihui,Liu Candi,Wang Qiwen,Wang Xiaohong,Wang Shengtian
Two-dimensional porous graphitic carbon nitride (g-C 3 N 4 ) nanosheets were synthesized by low-cost and direct thermal oxidation. Porous g-C 3 N 4 assembled with graphene oxide (GO) was immobilized on a glassy carbon electrode. The sensor was applied to simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA) with high performance. Cyclic voltammetry and differential pulse voltammetry were used to investigate electrochemical and electrocatalytic properties. The results indicate that the electrochemical sensor possesses high specific surface area, hierarchical pore structure and excellent signal response to AA, DA and UA. The oxidation potentials are well separated at around 0.15, 0.34 and 0.46 V for AA, DA and UA respectively. The determination limits for AA, DA and UA are 3.7 μM, 0.07 μM and 0.43 μM, respectively. The sensor was applied to tracking the three analytes in spiked serum samples with recovery 95.1~105.5% and relation standard deviations of less than 5%.
Schematic representation of porous graphitic carbon nitride nanosheet embedded in graphene oxide for simultaneous determination of ascorbic acid, dopamine and uric acid.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 5
·3944-3950
·
IF 2.22
Tian Xiuna,Dou Hongjian,Wu Lingyuan
Based on the luminescence of Bi 3+ , novel temperature sensing materials CaZrO 3 :Bi 3+ and CaZrO 3 :Bi 3+ /Sm 3+ were successfully synthesized by solid-state reaction. The XRD patterns show that the synthesized materials have a pure phase of CaZrO 3 . The XPS results show that the Bi 3+ and Sm 3+ can be detected in CaZrO 3 :Bi 3+ /Sm 3+ . With the excitation of 318 nm, the CaZrO 3 :Bi 3+ material shows intense temperature-dependent luminescence. The maximum relative sensitivity can be obtained at 440 K (1.78% K −1 ). Under the excitation of 408 nm, the CaZrO 3 :Sm 3+ material shows the characteristic emission peaks of Sm 3+ . The spectral overlap between the emission spectrum of Bi 3+ and the excitation spectrum of Sm 3+ leads to an energy transfer from Bi 3+ to Sm 3+ in CaZrO 3 :Bi 3+ /Sm 3+ phosphor. With the excitation of 318 nm, the emission spectrum of CaZrO 3 :Bi 3+ /Sm 3+ material shows the characteristic peaks of Bi 3+ and Sm 3+ . The fluorescence decay curves also show the evidence of the energy transfer from Bi 3+ to Sm 3+ . The luminescence intensity ratio of Sm 3+ and Bi 3+ in CaZrO 3 :Bi 3+ /Sm 3+ shows obvious temperature dependence. Based on the luminescence intensity ratio, a large relative sensitivity is obtained at 443 K (1.15% K −1 ).
✓ 已验证
DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 6
·3135-3146
·
IF 2.394
Wang Xue,Shi Yaru,Shan Jiajia,Zhou Hao,Li Mengjia
A sensitive electrochemical sensor was fabricated for the rapid determination of bisphenol A (BPA) based on cerium-centered metal-organic framework electrochemically reduced graphene oxide composite (Ce-MOF-ERGO) coupled with cetyltrimethylammonium bromide (CTAB) signal amplification. The Ce-MOF-ERGO was synthesized by electrochemical reduction of Ce-MOF-graphene oxide (GO) composite. Under the optimized conditions, the proposed electrochemical sensor exhibited a linear response for BPA in concentration range 3 nM to 10 μM with a detection limit of 1.9 nM. The excellent performance of the proposed sensor was attributed to the high conductivity, large surface area, and catalytic activity of Ce-MOF-ERGO composite. Moreover, the oxidation signals of BPA on Ce-MOF-ERGO-modified electrode were further enhanced significantly after addition of CTAB in electrolyte solution. Based on the dual signal amplification strategy, the sensor exhibited high sensitivity for BPA detection and was successfully applied to detect BPA in real samples with good recoveries.
✓ 已验证
产品关联
DOI
高影响因子
3 Biotech
·
2020
·Vol. 10
·期 2
·1-10
·
IF 1.798
Zheng Jianyong,Wei Wei,Wang Shengfan,Li Xiaojun,Zhang Yinjun,Wang Zhao
An immobilization method for binding cross-linked enzyme aggregates of Lipozyme TL 100L on macroporous resin NKA (CLEA-TLL@NKA) was developed in this study. The esterification activity of CLEA-TLL@NKA reached 6.4 U/mg. The surface structure of immobilized lipase was characterized by scanning electron microscopy. Methyl esterification reaction of soybean oil deodorizer distillate (SODD) was catalyzed by CLEA-TLL@NKA, which the conversion rate reached 98% and its activity retained over 90% after 20 batches of reaction. Compared with the commercial enzyme Lipozyme TLIM, half-life ( t 1/2 ) of CLEA-TLL@NKA increased by 25 times and the catalytic activity increased by approximate 10 times. Thus, CLEA-TLL@NKA had high catalytic activity, good operational stability, and potential industrial application in the field of oil processing.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-10
·
IF 12.121
Zhou Lu,Zhou Jun,Lai Wei,Yang Xudong,Meng Jie,Su Liangbi,Gu Chenjie,Jiang Tao,Pun Edwin Yue Bun,Shao Liyang,Petti Lucia,Sun Xiao Wei,Jia Zhenghong,Li Qunxiang,Han Jiaguang,Mormile Pasquale
In recent years, surface-enhanced Raman scattering (SERS) of a molecule/metal–semiconductor hybrid system has attracted considerable interest and regarded as the synergetic contribution of the electromagnetic and chemical enhancements from the incorporation of noble metal into semiconductor nanomaterials. However, the underlying mechanism is still to be revealed in detail. Herein, we report an irreversible accumulated SERS behavior induced by near-infrared (NIR) light irradiating on a 4-mercaptobenzoic acid linked with silver and silver-doped titanium dioxide (4MBA/Ag/Ag-doped TiO 2 ) hybrid system. With increasing irradiation time, the SERS intensity of 4MBA shows an irreversible exponential increase, and the Raman signal of the Ag/Ag-doped TiO 2 substrate displays an exponential decrease. A microscopic understanding of the time-dependent SERS behavior is derived based on the microanalysis of the Ag/Ag-doped TiO 2 nanostructure and the molecular dynamics, which is attributed to three factors: (1) higher crystallinity of Ag/Ag-doped TiO 2 substrate; (2) photo-induced charge transfer; (3) charge-induced molecular reorientation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 14
·16646-16655
·
IF 3.056
Zhu Meng,Luo Yongming,Cheng Nannan,Yang Ruyi,Zhang Juqin,Zhang Mengyun,Christie Peter
Diphenylarsinic acid (DPAA) is an emerging phenylarsenic compound derived from chemical warfare agents. It has been suggested that biostimulation of sulfate reduction decreases the concentrations of DPAA in soils. However, biostimulation often induces Fe(III) reduction which may affect the mobility and thereby the transformation of DPAA. Here, a soil incubation experiment was carried out to elucidate the impact of Fe(III) reduction on the mobilization and transformation of DPAA in a biostimulated Acrisol with the addition of sulfate and lactate. DPAA was significantly mobilized and then thionated in the sulfide soil (amended with sulfate and sodium lactate) compared with the anoxic soil (without addition of sulfate or sodium lactate). At the start of the incubation period, 41.8% of the total DPAA in sulfide soil was mobilized, likely by the addition of sodium lactate, and DPAA was then almost completely released into the solution after 2 weeks of incubation, likely due to Fe(III) reduction. The relatively low fraction of oxalate-extractable Fe in Acrisol, which contributes significantly to DPAA sorption and is more active and reduction-susceptible, may explain the observation that only < 40% of the Fe(III) (hydr)oxides were reduced when DPAA was completely released into the solution. A more rapid and final enhanced elimination of DPAA was observed in sulfide soil and the fraction of total DPAA decreased to 60.1 and 91.0%, respectively, at the end of the incubation in sulfide soil and anoxic soil. The difference appears to result from increased DPAA mobilization and sulfate reduction in sulfide soil. On the other hand, the formation of FeS precipitate, a product of Fe and sulfate reduction, may reduce the efficiency of DPAA thionation. Accordingly, the potentially contrasting effects of Fe(III) reduction on DPAA thionation need be considered when planning biostimulated sulfate reduction strategies for DPAA-contaminated soils.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 4
·1-9
·
IF 6.232
Ji Xiaoting,Wang Zhenbo,Niu Shuyan,Ding Caifeng
The present study shows that a dual-signal nanoprobe consisting of DNAzyme-functionalized porous carbon nanospheres (PCNs) responds to microRNA-21 and zinc ion (Zn 2+ ). The fluorescent probe undergoes an increase in the fluorescence intensity of fluorescein isothiocyanate (FITC) (with excitation/emission wavelengths at 488/517 nm) and the fluorescence intensity of cyanine-5 (Cy5) (with excitation/emission wavelengths at 633/670 nm) in the presence of microRNA-21 and Zn 2+ . The recognition between microRNA-21 and its complementary strand in the PCNs induces the separation of Zn 2+ -specific DNAzyme from PCNs, thus resulting in the increase of green fluorescence, and the exogenous Zn 2+ triggers the rupture of cleavage strand of DNAzyme and recovery of red fluorescence. This nanoprobe allows us to acquire in vitro the determination of microRNA-21 in the range of 2–300 nM with a detection limit of 0.57 nM and the determination of Zn 2+ in the range 2–100 nM with a detection limit of 0.43 nM, and in situ simultaneous imaging in MCF-7 breast cancer cells. Therefore, this strategy permits to obtain the expression levels of different biomarkers in living cells, providing a useful tool for diagnosis of cancers and understanding their biological process.
Schematic representation of the DNAzyme-functionalized porous carbon nanospheres for the imaging analysis of microRNA-21 and Zn2+ in living cells.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 30
·期 10
·3862-3868
·
IF 1.941
Wei Xiuxia,Xu Dongpo,Ge Kangjie,Qi Shuyan,Chen Yan
In this study, a simple and efficient strategy with bola-form template to construct the two-dimensional ultrathin multilayers ZIF-8 nanosheets was developed, the nanosheet was used as antibacterial for Aeromonas hydrophila ( A. hydrophila ) for the first time. It shows the obviously lamellar structure with eleven ZIF-8 lamellar crystal layers uniformly distributed in each nanosheet, the thickness of the whole nanosheet is approximately 36 nm, and the distance between the two adjacent layers is approximately 3.6 nm. It has the high antibacterial efficacy for A. hydrophila , which can be killed within 8 h.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 4
·1-14
·
IF 2.132
Cao Xinjiang,Guo Weiyun,Li Anhua,Du Juan,Du Lei,Zhang Guangjie,Liu Hui
Developing a high-efficient, low-cost visible-light-responsive photocatalyst is still a challenge in environmental remediation. Here, a three-dimensional (3D) porous architecture named reduced graphene oxide/CdS nanowire (RGO/CdS) aerogel was constructed by a facile two-step approach through coupling graphene with one-dimensional CdS nanowires (CdS NWs). A variety of characterization methods displayed that the resultant RGO/CdS aerogels were embedded with large amounts of CdS NWs with an average length and width of ∼ 2.9 μm and ∼ 60 nm, respectively, which would maximize the specific surface area that in turn markedly facilitate the transportation of photogenerated charge carriers and strong adsorption of organic pollutants. Moreover, the visible-light photocatalytic experiments demonstrated that the RGO/CdS aerogel exhibited a higher degradation rate (96.6%) for methylene blue (MB) degradation compared with that of bare CdS NWs or pure RGO xerogel. In this proposed study, a photocatalytic mechanism indicates that the enhanced photocatalytic activity of the 3D framework might contribute potentially to generate synergetic effect of CdS NWs into the space of graphene sheets.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2020
·Vol. 27
·期 4
·1003-1012
·
IF 2.183
Ren Hui-Fang,Luo Xiao,Zhang Ke,Cai Qiang,Liu Chun-Ling,Dong Wen-Sheng
Heteroatom (N, B or P)-doped ordered mesoporous carbons (OMCs) supported Ru catalysts was utilized in the aerobic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF). The characterization data showed that the heteroatom-doping of OMC promoted the dispersion of Ru nanoparticles on catalysts, which further improved their catalytic activities for the selective aerobic oxidation of HMF into DFF. Among the three kinds of heteroatom-doped Ru catalysts, the P-doped one displayed the best activity for the selective aerobic oxidation of HMF into DFF. From Ru/OMC-P0.56, 100% of HMF conversion, 88% of DFF yield with a high activity of 68.7 h −1 were achieved at 90 °C for 4 h under 2 MPa O 2 in toluene. Partial inactivation of catalyst was observed in the recycling runs, which might be attributed to the deposition of humins on catalyst and the agglomeration of Ru particles.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 38
·期 9
·973-982
·
IF 3.154
Zhao Dong,Shan Shu-Xi,Zhang Meng,Zhang Xiao-A,Jiang Sheng-Ling,Lyu Ya-Fei
Vinyl-containing titanium-silphenylene-siloxane oligomers ( O1 , O2 , O3 , and O4 ) with different molar ratios of titanium to silicon were successfully synthesized in high yields by nonhydrolytic sol-gel reaction, and the obtained four oligomers were further crosslinked with methylphenyl hydro-silicone oil ( 4 ) to form corresponding polymers ( P1 , P2 , P3 , and P4 ) by hydrosilylation reaction. Their structures were characterized with spectroscopic characterization techniques including FTIR, 1 H-NMR, and Raman spectroscopy. The effect of titanium element on crosslinking behavior, thermal resistance, refractive index, transparency, thermal aging stability, glass transition temperature, and surface properties of the polymers were studied. Compared with titanium-free polymer P1 , the thermal resistance, refractive index, and thermal aging stability of titanium-silphenylene-siloxane polymers ( P2 , P3 , and P4 ) were significantly improved. The titanium-silphenylene-siloxane polymers achieved a high refractive index ( n = 1.580–1.584) and thermostability ( T 5d > 500 °C). In thermal aging, the polymers exhibited superior performances with high optical transparency (~90% at 450 nm) and exhibited high thermal stability (~84% at 450 nm after thermal aging at 150 °C for 120 h). These data indicate that the polymers have potential application in optical materials such as LED encapsulants.
✓ 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）