MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 7
·1-10
·
IF 6.232
Liang Chunfeng,Lan Yuwei,Sun Zihua,Zhou Liya,Li Yanzhou,Liang Xinyuan,Qin Xingzhen
Carbon quantum dots co-doped with iron and nitrogen (Fe@NCDs) were synthesized by using Passiflora edulis Sims ( P. edulis ) as a precursor. The Fe@NCDs exhibit outstanding peroxidase-mimetic activity owing to successful doping with iron resulting in a behavior similar to that of iron porphyrins. In the presence of H 2 O 2 , the Fe@NCDs catalyze the oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) with a color change from colorless to blue. The blue oxidation product has a characteristic absorption peaking at 652 nm. A colorimetric assay was worked out for uric acid (UA) that measures the hydrogen peroxide produced during oxidation of UA by uricase. Response is linear in the 2–150 μM UA concentration range, and the limit of detection is 0.64 μM. The method was applied to the determination of UA in (spiked) urine, and recoveries ranged from 92.0 to 103.4%.
Schematic representation of the fabrication of iron and nitrogen co-doped carbon dots (Fe@NCDs) using Passiflora edulis Sims as carbon-based materials. First, uric acid (UA) was oxidized to generate H 2 O 2 by uricase. Then, the Fe@NCDs catalyzed the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to form blue-colored oxidized TMB (oxTMB) in the presence of H 2 O 2 . UA can be quantified based on the theory.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Material Cycles and Waste Management
·
2020
·Vol. 22
·期 5
·1639-1647
·
IF 1.974
Xu Yanmei,Xie Guangna,Bei Ke,Wang Liang,Wang Junliang,Chou I-Ming,Pan Zhiyan
Recycling of chemicals from waste plastics is important for the reutilization of resources and the reduction of environmental pollution. The phase behaviors of poly (1,4-cyclohexylene dimethylene terephthalate) (PCT) in water at different temperature and time were observed in a fused silica capillary reactor (FSCR) with a microscope. The effects of the reaction temperature (260−340 °C), the reaction time (30−90 min), and the mass ratio of water/PCT (6:1−14:1) on the degradation of PCT were studied in an autoclave reactor on the basis of the results obtained from the FSCR. Under our research conditions, depolymerization of both 1,4-cyclohexanedimethanol and terephthalic acid (TPA) generated mainly phenol, and the maximum yield of phenol was obtained at 340 °C after its reaction with a water/PCT mass ratio of 10:1 for 90 min. Moreover, a reaction mechanism of PCT degradation in subcritical water was proposed. Our results suggest that PCT can be depolymerized rapidly and completely in subcritical water to produce phenol, and this method is conducive to the recycling of waste PCT.
✓ 已验证
产品关联
DOI
高影响因子
NAUNYN-SCHMIEDEBERGS ARCHIVES OF PHARMACOLOGY
·
2020
·Vol. 394
·期 1
·165-175
·
IF 2.05
Xu Haibo,Qi Qian,Yan Xixin
Myricetin belongs to the flavonoid family which is derived from plant source. It is well-known for the anti-inflammatory and anti-oxidative properties yet the clinical use of myricetin awaits further discovery. Acute lung injury (ALI) is commonly caused by sepsis which leads to enormous burden with high morbidity and mortality. In this study, a murine sepsis model was constructed by cecal ligation and puncture (CLP). The indicated dose of myricetin (100 mg/kg) was further administrated intragastrically. The survival rate test indicated that myricetin significantly improved the vitality of CLP-operated mice. The pathological changes in morphology, biomarkers of inflammatory response, oxidative stress response, and mitochondrial damage were further detected. Myricetin showed significant inhibitory effects on these changes in CLP-induced mice. Furthermore, expression levels of transcription factor Nrf2 and heme oxygenase-1 (HO-1) along with DNA binding activity of Nrf2 were analyzed by western blot and EMSA, indicating that myricetin positively regulates the Nrf2/HO-1 pathway in CLP-induced sepsis mice. Murine sepsis models with knockdown of Nrf2 and control were further established and suggested that myricetin might exert protective effects on sepsis lung injury in dependent with Nrf2. Our study provides novel mechanisms for the protective effect of myricetin in sepsis-associated acute lung injury.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 25
·11296-11309
·
IF 3.553
Zhou Yujiu,Liu Qingxia,Chen Fujia,Zhao Yuetao,Sun Song,Guo Jimin,Yang Yajie,Xu Jianhua
Nanocomposite polymer materials are commonly used in energy storage devices on account of the excellent dielectric performance. However, there is a long-standing contradiction between dielectric constant and breakdown strength of nanocomposite. In this study, polyurea (PUA) is designed to in situ modify BaTiO 3 (BT) nanoparticles. Based on the excellent dispersity, favorable compatibility and outstanding insulating performance of BT@PUA particles, the P(VDF-CTFE)/BT@PUA nanocomposite exhibits enhanced breakdown strength and reliability. In addition, the introduction of BT@PUA enhanced the dielectric constant to 10.72 and 35% larger than that of pure P(VDF-CTFE). As a result, the energy density of BT@PUA composite reaches 8.94 J/cm 3 , which is 1.65 times than P(VDF-CTFE) (5.41 J/cm 3 ) and 4.5 times than the commercial biaxially oriented polypropylenes. Meanwhile, the quantified simulation illustrates the necessity of extremely high breakdown strength of the shell. Experiment results and simulation reveal that coating PUA is a novel and effective way to enhance energy storage performance for polymer nanocomposites with a promising broad application prospect.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 21
·26810-26816
·
IF 3.056
Chen Ying,Wang Yue,Zhou Xiaohan,Zhao Yang,Peng Wenchao
Synthesis of highly efficient photocatalysts for energy and environment catalysis is still a big challenge in the materials field. Cadmium sulfide (CdS) is a promising visible light-driven photocatalyst, which can be composited with co-catalysts to increase its photo-activity and stability. In this study, a kind of graphene material with abundant structure defects (D-rGO) is synthesized by a two-step annealing process with nitrogen-doped rGO (N-rGO) as an intermediate. The high-temperature annealing could remove the doped heteroatoms to form structure defects with five or seven carbon atoms. The D-rGO is then used as co-catalyst for the modification of CdS nanoparticles, and enhanced photocatalytic activities could be obtained. A large hydrogen evolution rate of 102.7 μmol h −1 g −1 is achieved, which is also effective for 4-nitrophenol reduction with a rate constant of 0.168 min −1 . The novel CdS/D-rGO composite contains no noble metals and could be used as multi-functional photocatalysts, thus should has great potential in the photocatalysis field.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2020
·Vol. 130
·期 1
·241-256
·
IF 1.52
Ge Meng,Chen Xingye,Li Yanyong,Wang Jiameng,Xu Yanhong,Zhang Lihong
This paper describes the synthesis and application of γ -Al 2 O 3 supported SmCoO 3 perovskite-type oxide in the catalytic propane dehydrogenation to propene. Various techniques including X-ray diffraction (XRD), H 2 temperature-programmed reduction (H 2 -TPR), transmission electron microscopy (TEM), thermogravimetric analysis (TG) and X-ray photoelectron spectra (XPS) were used to characterize the physico-chemical properties of SmCoO 3 /Al 2 O 3 and derived Co-based catalyst. The characterization results reveal that the perovskite lattice confinement can lead to better dispersed cobalt oxide and restrain the reduction to metallic Co species. Under the high weight hourly space velocity (3 h −1 ), the propane conversion and propene selectivity of the reduced SmCoO 3 /Al 2 O 3 catalyst were 25% and 94%, respectively, and obviously higher than those of the reduced SmCoO/Al 2 O 3 catalyst used as a referential sample prepared by an incipient wetness impregnation method. A large amount of coke was formed over the used SmCoO/Al 2 O 3 catalyst. Instead, the SmCoO 3 /Al 2 O 3 -derived Co-based catalyst can greatly reduce the amount of coke deposition. The superior catalytic performance and anti-coking ability of SmCoO 3 /Al 2 O 3 catalyst are attributed to the formation of a large amount of well-dispersed surface Co 2+ species, especially small CoO nanoparticles, and the absence of metallic Co species.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2020
·Vol. 24
·期 4
·1007-1015
·
IF 2.646
Su Chang,Han Bing,Ma Jiaojiao,Guo Pengju,Xu Lihuan
In the present work, the poly(o-phenylenediamine)/Ag (PoPD/Ag) hybrid composite with the microrod morphology was prepared by in situ chemical oxidation method, and then composite electrodes of PoPD/Ag (PVDF) and PoPD/Ag (sodium alginate) were prepared by using PVDF and sodium alginate as electrode binders, respectively. As explored as the anode of lithium ion batteries, the redox-active PoPD in the hybrid composite, compared to the pure PoPD, demonstrated the remarkably improved electrochemical performances with superior high capacity and good rate capability and cycling stability, due to the improved intrinsic electrical conductivity of PoPD via the introduced Ag nanoparticles in the polymer. As the sodium alginate was chosen as the functional electrode binder, PoPD/Ag (sodium alginate) exhibited the initial charge/discharge-specific capacity of 1452.9/2317.7 mAh g −1 , and after the 100th cycles, the developed discharge capacity for PoPD/Ag (sodium alginate) reached to 1389.9 mAh g −1 , which was evidently higher than that of PoPD. Its stable and representative discharge-specific capacities were 1291, 1044.9, 856.7, 762.5 mAh g −1 at the current rate of 50, 100, 200, and 500 mAh g −1 , respectively, which were obviously superior to that of PoPD and PoPD/Ag (PVDF), indicating that sodium alginate as binder has the special effects on the electrochemical characteristics of PoPD, which benefited to the capacity release step by step during the charge/discharge process. The works would provide significant exploration for the preparation of high-performance poly (aromatic amine) polymer as the electrode materials.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 5
·1-11
·
IF 6.232
Zheng Xiaoke,Li Chenghui,He Yaqin,Wu Lan,Hou Xiandeng
In this work, a novel bi-modal imaging probe with enhanced CT contrast efficiency and FL brightness was constructed, in which the combination of a binary CT contrast agent BaHoF 5 and Cu-doped QDs served as a vehicle; hyaluronic acid (HA) was employed as a tumor-targeting ligand. With its CT contrast efficiency about 2.1- and 3.9-fold higher than PEG-BaHoF 5 and Iohexol, the CT contrast efficiency and the fluorescent brightness of the bi-modal probe were both enhanced. Likewise, its fluorescent brightness is almost 6-fold brighter after Cu-doped QDs loading. The most important contribution of this work lies on the proposed strategy. The inherent contradiction of the imaging sensitivity of CT and FL imaging is well balanced and a great CT/FL bi-modal imaging performance is simultaneously obtained even at low concentration (400 μg/mL) of the probe, which was superior to the previous CT/FL bi-modal probes. Moreover, since BaHoF 5 as a binary CT contrast agent was introduced instead of conventional Au and Bi 2 S 3 , the CT/FL bi-modal probe would be more suitable for different patients under different operation voltages. In addition, the in vitro tumor cell imaging also demonstrated a good photo-stability, FL brightness, and tumor-targeting capability of the probe, indicating its great potential in practical bi-modal imaging for further tumor diagnosis and therapy.
A novel bi-modal imaging probe with enhanced CT contrast efficiency and FL brightness was fabricated, in which its CT contrast efficiency was about 2.1- and 3.9-fold higher than PEG-BaHoF 5 and Iohexol, respectively, and its fluorescent brightness almost 6-fold brighter after Cu-doped QDs loading.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biochar
·
2020
·Vol. 2
·期 1
·81-92
·
IF 0
Zhu Sihang,Qu Ting,Irshad Muhammad Kashif,Shang Jianying
A novel α-FeOOH modified wheat straw biochar (α-FeOOH@BC) was developed and the findings of the current study showed that α-FeOOH@BC is an efficient material for the simultaneous removal of cations (Cd(II)) and anions (As(III)) from aqueous solutions. The SEM, FTIR, and XRD analysis proved that α-FeOOH@BC was covered by α-FeOOH. In the single adsorption system, the maximum adsorption capacities of α-FeOOH@BC for Cd(II) and As(III) were 62.9 and 78.3 mg/g, respectively. In the dual adsorption system, the maximum adsorption capacities of α-FeOOH@BC for Cd(II) and As(III) dropped to 39.3 and 67.2 mg/g, respectively. The adsorption capacities of Cd(II) and As(III) by α-FeOOH@BC were much higher by BC and α-FeOOH both in single and dual adsorbate system. The adsorption results were well fitted by the Langmuir and pseudo-second-order kinetics models. The Cd(II) and As(III) co-adsorption on α-FeOOH@BC had a competitive effect, and the dominant adsorption mechanisms were co-precipitation and ion exchange. Our study showed that α-FeOOH@BC could be an effective remediation material for Cd(II) and As(III) co-adsorption from aqueous environment.
✓ 已验证
产品关联
DOI
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-9
·
IF 3.998
Chen Xutao,Yu Lisha,Zou Shihui,Xiao Liping,Fan Jie
It is challenging to develop a low-cost household water treatment (HWT) that simultaneously deliver an effective and robust way for safe and reliable water supply. Here, we report a simple flow-through filter made by zeolite-cotton packing in a tube (ZCT) as low-cost HWT device to remove heavy metal ions from contaminated water. The zeolite-cotton is fabricated by an on-site template-free growth route that tightly binds mesoporous single-crystal chabazite zeolite onto the surface of cotton fibers. As a result, the ZCT set-up with optimized diameter achieves both high adsorption efficiency, proper flow rate, reliable supply and strong stability at the same time. After flowed through the set up packed with 10 g of zeolite-cotton, 65 mL 1000 ppm Cu 2+ solution was purified down to its safety limit (<1 ppm). Notably, their efficiency remains unaltered when filtering several ions simultaneously. In a simulated purification process, 8 L of water contaminated by Cu 2+ , Cd 2+ and Pb 2+ could be transformed into drinking water and it enables the removal of heavy metals to concentrations of below 5 ppb (μg L −1 ). We also show that the ZCT can be used for disinfection by introducing Ag-exchanged zeolite-cotton without contaminating the water with Ag ions (<0.05 ppm).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 17
·7417-7431
·
IF 3.553
Meng Xingtong,Jia Shuai,Mo Lanlan,Wei Jie,Wang Feijun,Shao Ziqiang
Nowadays, it has become a trend to prepare porous carbon as electrode materials for supercapacitors by using biomass and its derivatives by virtue of its low cost, abundant source and environmental friendliness. Carboxymethyl cellulose ammonium (CMC-NH 4 ), a kind of cellulose derivative, is used as a carbon precursor and O/N source to prepare carbon material through cross-linking with aluminum ions, lyophilization, carbonization and activation. The as-prepared O/N-co-doped carbon samples (ONAC-500, ONAC-600 and ONAC-700) exhibit hierarchically porous structure with different size pores in carbon framework, ensuring electrolyte ions effective transport and diffusion. Meanwhile, the ONAC-600 reveals a high specific surface area of 2658 m 2 g −1 , abundantly porous structure with pore volume of 1.32 cm 3 g −1 and effective O/N-doping, which ensure a high capacitance of 465.0 F g −1 at 1 A g −1 in 3 M KOH three-electrode system. It also shows better rate capability and good stability after 10000 cycled under 10 A g −1 . Besides, the assembled all-solid-state supercapacitor with ONAC-600 delivers an acceptable energy density of 7.8 Wh kg −1 at a power density of 124.2 W kg −1 .
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 7
·5760-5768
·
IF 2.22
Liu Ning,Xu Fei,Zhu Yan,Hu Yongmao,Liu Guitang,Wu Liang,Wu Kangjing,Sun Shuhong,Hong Feng
Multi-component chalcogenide (Cu 1− x Ag x ) 2 ZnSnS 4 (CAZTS, x = 0, 0.1, 0.2, 0.3, 0.4) nanoparticles were synthesized by incorporation of Ag into wurtzite Cu 2 ZnSnS 4 (CZTS) using a simple one-pot method and were characterized by X-ray diffraction, Raman spectroscopy, transmission electron microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and UV–Vis–NIR absorption spectrum, respectively. The synthesized nanoparticles exhibit the phase transition from wurtzite to kesterite structure when the substitution ratio ( x ) of Ag is around 0.3. The bandgaps of CAZTS nanoparticles are in the range of 1.43–1.64 eV. This finding indicates that Ag substitution in wurtzite CZTS is an effective way to adjust the bandgap and structure.
✓ 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）