ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Xuebin Hou,Huimin Zhou,Min Zhao,Yibing Cai,Qufu Wei
Molybdenum disulfide (MoS2), although it has shown great potential use in electrocatalysis, owns inert basal planes and the low electrical conductivity that limit its effective application. In this work, a MoS2/carbon nanocage hybrid catalyst (MoS2/Co–N–CN2) with a higher density of exposed edge sites and conductivity was developed for efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The hybrid catalyst was successfully prepared via confined growth of MoS2 in the porous carbon matrix derived from the metal organic framework ZIF-67. X-ray photoelectron spectroscopy revealed that the hybrid catalyst contained a significantly higher density of terminal sulfur edges than bulk MoS2. The hybrid catalyst exhibited a high catalytic activity for HER and OER, with low onset overpotentials and small Tafel slopes. This enhanced catalytic performance is a direct result of the increased exposed sulfur edge sites, high surface area, and unique synergic effects between MoS2 nanoplates and Co–N-doped porous carbon matrix. Therefore, the hybrid (MoS2/Co–N–CN2) catalyst serves as a highly promising bifunctional catalyst for HER and OER.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Xiaohong Wang,Xin Li,Chengxiang Huang,Chen Hao,Cunwang Ge,Yaning Guo
Herein, the NiCo 2 Al-LDH/N-GO electrode was first and successfully synthesized by a simple and environmental-friendly method. The NiCo 2 Al-LDH/N-GO electrode has a high specific capacitance of 1136.67F g −1 at a current density of 1 A g −1 , and the specific capacitance retention rate maintained 90.10% after 5000 cycles at a current density of 10 A g −1 . The prepared NiCo 2 Al-LDH/N-GO electrode has excellent electrochemical performance and cycle performance. In addition, the ASC device was assembled using NiCo 2 Al-LDH/N-GO as the positive electrode and activated carbon as the negative electrode with KOH/PVA as gel electrolyte. The NiCo 2 Al-LDH/N-GO//AC asymmetric capacitor exhibits a high energy density of 42.25 Wh kg −1 at a power density of 800 W kg −1 and 11.39 Wh kg −1 at a power density of 8 kW kg −1 . Thus, NiCo 2 Al-LDH/N-GO electrode shows the potential application in energy storage device.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Sha Liu,Xiaoteng Jiang,Zhi Shang,Yin Ji,Huiyu Wang,Zeyuan Wang,Peng Wang,Yan Zhang,Hua Xiao
Glycoproteins are important biomarkers for cancers, while most glycoproteomics biomarkers suffering from low sensitivity and specificity due to their uncharacterized glycan structures. AZGP1 is a potential biomarker for salivary diagnostics of lung cancer, which is used as a model glycoprotein in this study for method development. We initially analyzed salivary N-glycoproteome by using lectin affinity chromatography and more than 300 N-glycoproteins were identified, including AZGP1. 7 gel spots of AZGP1 were resolved by two-dimensional gel electrophoresis and further confirmed by two-dimensional western blot as well as mass spectrometry. The isomeric glycan structures of AZGP1 in these spots were systematically characterized both at composition level and at structure level. Our results revealed 10 glycan compositions for salivary AZGP1, including core fucosylated glycans on Asn128 and sialylated glycans on Asn109 and Asn112. We further compared the glycan structures of salivary AZGP1 from lung cancer group and control group. Accordingly, 14 and 7 potential glycan structures were successfully revealed, respectively. In total, 15 glycan compositions and 22 potential glycan structures were identified and characterized for AZGP1, including some different structures with the same compositions. In particular, 5 potential glycan structures were identified as lung cancer unique signatures. Our developed strategy holds promise for thorough identification of glycan structures on a target glycoprotein biomarker. In-depth characterization of its glycan structures will ultimately enhance its sensitivity and specificity for cancer detection.
✓ 已验证
DOI
PubMed
高影响因子
ACS Omega
·
2020
·
IF 2.87
Yan Ji,Xiaoliang Yang,Zhi Ji,Linhui Zhu,Nana Ma,Dejun Chen,Xianbin Jia,Junming Tang,Yilin Cao
The infrared spectrum (IR) characteristic peaks of amide I, amide II, and amide III bands are marked as amide or peptide characteristic peaks. Through the nuclear magnetic resonance study, N-methylacetamide has been determined to have six fine components, which include protonation, hydration, and hydroxy structures. Then the independent IR spectrum of every component in N-methylacetamide is calculated by using the density functional theory quantum chemistry method, and the contribution of each component to amide I, II, and III bands is analyzed. The results of this research can help to explain the formation of the amide infrared spectrum, which has positive significance in organic chemistry, analytical chemistry, and chemical biology.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Run Huang,Yanfei Li,Wenbin Liu,Yonghai Song,Li Wang
N-doped honeycomb-like carbon networks (N–HCN) loaded with ultra-fine Fe 2 O 3 nanoparticles (Fe 2 O 3 /N–HCN) are proposed as anode materials for lithium-ion batteries (LIBs). The Fe 2 O 3 /N–HCN nanocomposites are prepared by freeze-drying of glucose-Fe(NO 3 ) 3 solution, following by grinding it with urea, and finally annealing treatment. The N–HCN with dozen micrometer-sized macropores is composed of carbon nanosheets with a thickness of about 33 nm. A large number of 2–7 nm-sized ultra-fine Fe 2 O 3 nanoparticles with an average size of 4.4 nm are uniformly arrayed on the wall of N–HCN. The Fe 2 O 3 /N–HCN nanocomposites exhibit good performances as anode materials for LIBs. After 500 cycles under a large current density of 5 A g −1 , the Fe 2 O 3 /N–HCN nanocomposites still show a reversible capacity of 408 mAh g −1 . The good performance can be ascribed to the uniformly dispersed ultra-fine Fe 2 O 3 nanoparticles and unique honeycomb-like structure of N–HCN which provides a continuous conductive network to greatly promote the rapid transfer of ions and electrons, and effectively alleviate the volume fluctuation effect of Fe 2 O 3 during charging and discharging. More importantly, the cheap and environmentally friendly glucose as raw materials provides possibility for green energy applications.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 7
·4083-4090
·
IF 11.301
Jin Liu,Xingcai Zhang,Qian Zhong,Jun Li,Hongzhang Wu,Bo Zhang,Lin Jin,Hua Bing Tao,Bin Liu
Semiconductor p–n junction engineering plays an indispensable role in developing highly efficient photocatalysts for energy conversion and environmental remediation. Herein, a novel AgI/Bi2Ga4O9 p–n junction photocatalyst is successfully constructed by an electrostatic self-assembly approach. Photoelectrochemical characterization together with density functional theory calculations shows that the formation of a p–n junction at the AgI/Bi2Ga4O9 interface favors separation and transfer of photogenerated charge carriers. The ˙O2− generated by 25%-AgI/Bi2Ga4O9 reaches a concentration of 18.8 μmol L−1 after 60 min of irradiation, which is 3.3 and 12.5 times higher than that generated by AgI and Bi2Ga4O9, providing 25%-AgI/Bi2Ga4O9 with greatly enhanced photocatalytic activity toward Acid Red 1 and metronidazole degradation. Our work provides a novel strategy for designing highly efficient photocatalysts for a wide range of energy and environmental applications.
✓ 已验证
产品关联
DOI
高影响因子
Biotechnology for Biofuels
·
2020
·Vol. 13
·期 1
·1-14
·
IF 4.815
Zhang Alei,Mo Xiaofang,Zhou Ning,Wang Yingying,Wei Guoguang,Chen Jie,Chen Kequan,Ouyang Pingkai
Background N -Acetyl glucosamine (GlcNAc) and N -Acetyl chitooligosaccharides ( N -Acetyl COSs) exhibit many biological activities, and have been widely used in the pharmaceutical, agriculture, food, and chemical industries. Particularly, higher N -Acetyl COSs with degree of polymerization from 4 to 7 ((GlcNAc) 4 –(GlcNAc) 7 ) show good antitumor and antimicrobial activity, as well as possessing strong stimulating activity toward natural killer cells. Thus, it is of great significance to discover a β- N -acetyl glucosaminidase (NAGase) that can not only produce GlcNAc, but also synthesize N -Acetyl COSs. Results The gene encoding the novel β- N -acetyl glucosaminidase, designated Cm NAGase, was cloned from Chitinolyticbacter meiyuanensis SYBC-H1. The deduced amino acid sequence of Cm NAGase contains a glycoside hydrolase family 20 catalytic module that shows low identity (12–35%) with the corresponding domain of most well-characterized NAGases. The Cm NAGase gene was highly expressed with an active form in Escherichia coli BL21 (DE3) cells. The specific activity of purified Cm NAGase toward p -nitrophenyl- N -acetyl glucosaminide ( p NP-GlcNAc) was 4878.6 U/mg of protein. Cm NAGase had a molecular mass of 92 kDa, and its optimum activity was at pH 5.4 and 40 °C. The V max , K m , K cat , and K cat / K m of Cm NAGase for p NP-GlcNAc were 16,666.67 μmol min −1 mg −1 , 0.50 μmol mL −1 , 25,555.56 s −1 , and 51,111.12 mL μmol −1 s −1 , respectively. Analysis of the hydrolysis products of N -Acetyl COSs and colloidal chitin revealed that Cm NAGase is a typical exo-acting NAGase. Particularly, Cm NAGase can synthesize higher N -Acetyl COSs ((GlcNAc) 3 –(GlcNAc) 7 ) from (GlcNAc) 2 –(GlcNAc) 6 , respectively, showed that it possesses transglycosylation activity. In addition, Cm NAGase also has reverse hydrolysis activity toward GlcNAc, synthesizing various linked GlcNAc dimers. Conclusions The observations recorded in this study that Cm NAGase is a novel NAGase with exo-acting, transglycosylation, and reverse hydrolysis activities, suggest a possible application in the production of GlcNAc or higher N -Acetyl COSs.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 47
·49559
·
IF 2.52
Yifan Wang,Ming Duan,Xiujun Wang,Bo Jing,Fei Wang,Yan Xiong,Shenwen Fang
Gas flotation is one of the important technologies for oily wastewater treatment and the surface-active polymer is an important kind of developing flotation agents. In this article, the flotation performance, polymerization kinetics, and copolymerization behavior of surface-active copolymer of N -[3-(dimethylamino) propyl] methacrylamide (DMAPMA) and dodecyl dimethyl propenyl ammonium chloride (C 12 DM) and copolymer of DMAPMA and decyl dimethyl vinylbenzyl ammonium chloride(C 10 MVBA) were investigated. The flotation experiment showed that both copolymers had an oil removal of 97% at the concentration of 30 mg/L. The result of polymerization kinetics showed that the polymerization initiation rate was influenced by the monomer concentration and the polymerization termination was dominated by bimolecular termination and accompanied by unimolecular termination. The activation energy of DMAPMA-C 12 DM copolymerization (89.64 kJ/mol) was smaller than that of DMAPMA-C 10 MVBA (91.65 kJ/mol) copolymerization. The reactivity ratios of DMAPMA and C 12 DM were 0.46 and 15.52, respectively, as well as the reactivity ratios of DMAPMA and C 10 MVBA were 1.19 and 35.77, respectively. These results are meaningful for the oily wastewater flotation and the copolymerization mechanism of DMAPMA-based copolymer.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Xiujuan Li,Le Chen,Dandan Zhu,Song Yang,Zhong Wu,Mingyang He,Zhihui Zhang,Qun Chen
A novel ZIF-8-CMC hybrid material was fabricated from the hybridization of ZIF-8 and carboxymethylcellulose (CMC) by impregnation method for n -hexane/3-methylpentane separation. The surface properties of ZIF-8 were tailored by introducing CMC into ZIF-8 nanoparticles . In this work, adsorption separation of n -hexane ( n HEX) and 3-methylpentane (3MP) on ZIF-8-CMC were investigated by batch vapor-phase adsorption and liquid-phase breakthrough adsorption. The adsorption selectivity of n HEX/3MP reversed from preferable adsorption of n HEX to preferable adsorption of 3MP upon the increasing of CMC containing in the hybrid materials. As the temperature increases, the adsorption amounts of n HEX and 3MP decrease. With the increasing of CMC contents, the n HEX uptake decreased, the uptake capacity of 3MP increased gradually. For liquid-phase breakthrough adsorption, the dynamic adsorption capacity of n HEX also decreased with the increasing of temperature.
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Xie He,Yong Han,Xueli Luo,Weixia Yang,Chunhua Li,Wenzhi Tang,Tianli Yue,Zhonghong Li
A ratiometric fluorescence (FL) sensor was fabricated by coordinating 2, 6-pyridinedicarboxylic acid (DPA) sensitized Tb 3+ (Tb-DPA) with NH 2 and COOH on the surface of the N -doped carbon dots ( N -CDs) for detecting Hg 2+ in seafood. The sensor exhibited two FL emissions at 436 nm ( N -CDs) as the response signal and at 543 nm (Tb-DPA) as the reference signal when excited at 290 nm. After adding Hg 2+ , the FL emission at 436 nm was significantly quenched and the FL emission at 543 nm was negligibly changed. The electron transfer (ET) between COO − of N -CDs and Hg 2+ led to the FL quenching of N -CDs. The FL ratio (F 436 /F 543 ) exhibited a good linear relationship in the Hg 2+ concentrations of 1 161.51 μM with a low limit of detection (LOD) of ~37 nM. The sensor presented high selectivity, satisfactory accuracy and precision toward Hg 2+ in seafood with recoveries of 86.45–114.47% and RSDs of 0.20–1.92%.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS SURVEYS FROM ASIA
·
2020
·Vol. 24
·期 2
·104-114
·
IF 2.194
Yang Lijuan,Song Zhaoyang,Yu Yingmin,Zhu Lijun,Xia Daohong
A novel bimetallic bifunctional Pt–NiP/Hβ isomerization catalyst was successfully prepared by introducing a small amount of noble metal Pt into the NiP on the Hβ carrier. The catalyst demonstrated superior catalytic activity to Pt/Hβ and NiP/Hβ catalysts for n -hexane isomerization, due to the good surface property, the synergistic effect of the two metals, the suitable match between acid site and metal site, as well as good reduction stability. The effects of Pt loading and NiP addition amount on the surface property were studied comprehensively through a series of characterization, and the correlation among surface property with catalytic behavior was also analyzed. The results indicated that the Pt (0.1 mol%)–NiP (10 mol%)/Hβ catalyst had good structural characters, surface acid property and an uniform distribution of NiP and Pt active components on surface, which is helpful to obtain a highly efficient catalytic performance. Additionally, the influence of reduction/reaction conditions on the catalytic activity, as well as the catalyst tolerance to water and thiophene sulfur, was investigated furtherly.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Chao Wang,Xiaodan Wang,Fengyu Lai,Zheng Liu,Ruohao Dong,Wen Li,Hongxia Sun,Baoyou Geng
Metal–organic framework (MOF)-derived materials have attracted increasing attention in the field of energy storage and conversion. Calcining MOFs to carbonized structures is a common route to obtain MOF-derived materials. However, the existing calcination conditions often cause the structural collapse and the specific surface area to be significantly reduced. In this work, we use argon–hydrogen mixed gas for calcination of MOFs to obtain a N-doped porous carbon material with excellent properties. Its BET specific surface area and pore volume up to 2476 m2 g–1 and 1.325 cm3 g–1, respectively, which are higher than those of the precursor ZIF-8 (1960 m2 g–1 and 0.687 cm3 g–1), perfectly inherited the rhombic dodecahedron morphology of the precursor. Hydrogen reduces the zinc in ZIF-8 at high temperature to evaporate, which avoids the carbothermal reduction reaction between the zinc component and the carbon framework of MOFs, protecting the framework of MOFs and leaving a lot of micropores, so that after the carbonization of MOFs it still has extremely high specific surface area and pore volume, even surpassing the MOFs precursors. We loaded Pt nanoparticles on the prepared porous carbon to catalyze the oxygen reduction reaction and showed an excellent half-wave potential of 0.883 V, which is 10 mV higher than that of the commercial Pt/C (Pt 20 wt %), while the Pt loading is only 8.66 wt %. The stability is also much better than Pt/C.
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）