ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Liming Ren,Chao Wang,Wen Li,Ruohao Dong,Hongxia Sun,Ning Liu,Baoyou Geng
Designing highly efficient bifunctional water splitting electrocatalyst is essential to ease the forthcoming energy crisis and the increasingly severe environmental problems. In this paper, NiFe-LDH@Ni 3 S 2 arrays on nickel foam (NF) are prepared via a facile two-step hydrothermal approach. The catalyst with a special structure of on-chip epitaxial growth of sheet grown vertically on nickel foam not only provides enhanced interface connections and massive exposed active sites but also accelerates the transmission of electronics. The experimental results demonstrate that Ni1Fe10-LDH@Ni 3 S 2 /NF possesses exceptional electrocatalytic performance for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) compared to individual NiFe-LDH and Ni 3 S 2 . It demands 230 mV to drive a current density of 50 mA cm −2 toward OER while it just needs 197 mV to afford 20 mA cm −2 for HER. Additionally, Ni1Fe10-LDH@Ni 3 S 2 /NF as both cathode and anode in a two-electrode system just requires 1.65 V to reach 10 mA cm −2 and still remains stable after a 12 h chronoamperometry measures. The as-synthesized electrocatalyst with improved electrocatalytic performance, outstanding long-term stability and low-priced is prospective for overall water splitting practical production.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Yonghao Wang,Dengwang Luo,Yao Fang,Wanhao Wu,Yongjing Wang,Yaokun Xia,Fang Wu,Chunyan Li,Jianming Lan,Jinghua Chen
Exosomes may be used as a crucial medium for the early diagnosis and potential therapy of tumors because of containing a variety of biological information. Therefore, the accurate quantitative analysis of exosomes is especially important in the biomedical field. Herein, we proposed a washing-free aptasensor based on luminescence resonance energy transfer (LRET) between rare-earth doped upconversion nanoparticles (UCNPs) donor and tetramethyl rhodamine (TAMRA) acceptor for highly sensitive detection of exosomes. Therein, the combination of UCNPs and TAMRA can be achieved through the coupling of aptamers to the epithelial cell adhesion molecule (EpCAM), the highly expressed surface proteins of the exosomes. Therefore, when the system of UCNPs-TAMRA in the presence of exosomes is excited by near-infrared light at 980 nm, TAMRA emits yellow fluorescence at 585 nm due to LRET. As a result, the fluorescence intensity at 585 nm is linearly correlated to the concentration of exosomes, which is available for the detection and quantification of exosomes. Under optimal conditions, the proposed approach can reach a low limit of detection (LOD) of 80 particles/μL, and effectively reduce the background signal by using UCNPs as an energy donor. Moreover, this proposed aptasensor can be universally applied to the detection of other targets by strictly screening the aptamers.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Guohui Li,Kun Jiang,Sher Zaman,Jinnan Xuan,Zhiqiang Wang,Fengxia Geng
Tuning the feature sizes and surface moiety groups of a two-dimensional (2D) sheet material has been regarded as the most effective strategy for achieving desired physical and chemical properties. The newly emerging transition-metal carbide or nitride sheets, generally referred to as MXenes, are of interest to the research community owing to their versatile behavior. While the chemical stability of MXenes is of pivotal importance to their real applications, a systematic study of examining the effect of their surface and lateral size on the resulting chemical stability is still lacking. Herein, by systematically varying the synthesis parameters, we obtained both regular and ultrasmall Ti3C2 sheets with different surfaces, namely, Al oxyanions or OH/F. To investigate the chemical stability and sustainability of each Ti3C2 sheet in an oxidizing environment, including an ambient atmosphere and a H2O2 medium, the evolution of phase, morphology, and optical behavior was carefully studied. The sheets covered with Al oxyanions had greater structural stability than those covered with the other species considered in this study, which may be due to the Al oxyanions acting like a shield and passivating the surface in the oxidizing atmosphere. Regarding the effect of feature size, thinner sheets or those with smaller lateral dimensions showed improved oxidation resistance, which could be due to the difficulty encountered in the structural recrystallization from Ti3C2 to oxidized product TiO2. This study provides a deeper understanding of MXenes and a method to efficiently engineer structures with desired performances.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Weibing Li,Lin Wang,Qiang Zhang,Zhuoyuan Chen,Xiaoyan Deng,Chang Feng,Likun Xu,Mingxian Sun
An ultrathin 2D/2D C 3 N 4 /MoS 2 (U-CN/MoS 2 ) heterojunction photocatalyst was prepared by a simple mechanical grinding technique to investigate the photocatalytic degradation RhB and hydrogen production performance. Physical characterization shows that the ultrathin MoS 2 nanosheets (U-MoS 2 ) can form heterojunction with the ultrathin C 3 N 4 (U-CN), and their intrinsic crystal structure remains stable. Further photocatalytic performance test demonstrated that the U-CN/MoS 2 heterojunction photocatalyst significantly enhanced the photocatalytic activity of U-CN. The U-CN/MoS 2 photocatalyst with 3% mass fraction of MoS 2 station (U-CN/MoS 2 -3) has the optimal photocatalytic performance. Due to MoS 2 has a suitable band structure and can replace noble metal as a co-catalyst, the U-CN/MoS 2 -3 could achieve the hydrogen production efficiency of 385.04 μmol∙h −1 ∙g −1 , which makes MoS 2 show potential in photocatalytic hydrogen production. The enhanced photocatalytic performance was attributed to the significantly enhanced concentration of photogenerated carriers, the effective separation of photogenerated carriers, and suppressed recombination of photogenerated electrons and holes in the photocatalytic reaction.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Binglun Chen,Chenxiao Jiang,Dongbo Yu,Yaoming Wang,Tongwen Xu
The development of novel technologies for wastewater treatment provides a reliable pathway to solve the growing environmental issues. Control on process cost, increment of pollutant removal efficiency, and multi-system applicability are key points which should be carefully considered. Here in this work, a novel method of ‘water splitting coagulation (WSC)’, which involves the synchronous treatment of two kinds of wastewater that contain metal and organic contaminants was proposed. As an electrical based technique, WSC utilizes ‘water splitting’ in a bipolar membrane (BM) instead of ‘water electrolysis’ on electrodes to constructively produce a flocculating constituent ( Ni ( O H ) x ( 2 - x ) + ) by controlling the ‘hydroxide delivery’ and ‘cation delivery’ inside a BM and across a cation exchange membrane. The metal hydroxide is capable of absorbing textile dyes in ( D y e ) y N i ( O H ) x ( 2 - x ) + form, which can be post-treated to produce useful resources. The alternative process has several advantages: 1) prevents the replacement of sacrificial anodes, 2) simultaneous removal of heavy metal and textile dyes, and 3) the recycling of valuable accompanying byproducts, and has great potential in the complex industrial wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2019
·Vol. 11
·期 7
·1327-1336
·
IF 4.76
Jianfei Tie,Liduo Rong,Hongchen Liu,Bijia Wang,Zhiping Mao,Linping Zhang,Yi Zhong,Xueling Feng,Xiaofeng Sui,Hong Xu
Stretchable, self-healable, conductive hydrogels have received increasing attention due to their broad range of applications, such as wearable devices and ionic skin. However, severe challenges remain in integrating fatigue resistance, favorable self-healing, and stretchable and compressible efficiency into a hydrogel. Herein, a highly stretchable, compressible, self-healable somatosensory platform was fabricated by blending Fe3+ ions with polyvinyl alcohol acetoacetate (PVAA)/polyacrylamide (PAM) hydrogel to form a double network hydrogel, which combined chemical coordination and physical crosslinking in one system. In this system, the PAM network offered high stretchability and compressibility to the hydrogel. Meanwhile, the coordination of the Fe3+/PVAA network provided ionic conductivity and self-healing ability. The resulting hydrogel exhibits prominent stretchability (>700%), high sensitivity, high healing efficiency (80% within 24 h) and excellent fatigue resistance. Therefore, the hydrogel could be used as a potential artificial ionic skin including strain and pressure sensors to directly monitor human motion.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Yingying Qi,Yiting Chen,Fu-Rong Xiu,Jinxiao Hou
Convenient and practical detection of the ultra-low concentration of single-component pesticide residue in real environmental samples is crucial for the assessment of environmental risks caused by this pesticide. Herein, a simple and rapid colorimetric sensor for the detection of acetamiprid in real environmental samples and agricultural products was constructed by the direct and sensitive response of positively charged gold nanoparticles ((+) AuNPs) to the aptamer structure change induced by acetamiprid. (+) AuNPs’ response to target is direct and sensitive with no need of the salt-induced process. The affinity interaction between aptamer and target is carried out in an isolated and optimized system without interference. Consequently, this colorimetric sensor has high sensitivity. Even with the naked eye, acetamiprid as low as 7.5 × 10 −8 M was observed to cause the color change of (+) AuNPs within minutes. The detection limit of the colorimetric sensor was calculated to be 5.6 × 10 -10 M, which was about one order of magnitude lower than that in (-) AuNPs system and far lower than that of other colorimetric methods. Moreover, it was found that the high specificity of aptamer recognition could withstand the complexity of real samples. Compared with the standard HPLC method, the detection results of the colorimetric analysis have excellent accuracy and reliability. In particular, the processing of the real sample in the colorimetric sensor is much simpler and does not require professional chromatographic separation.
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Yingtian Hu,Dongdong Zhao,Yali Qin,Xiaoping Wang
Three-dimensional fluorescence spectroscopy has been widely used for the analysis of water contaminants. However, the problems of weak signals and overlapping fluorescence peaks remain unresolved. In this work, we studied the impact of absorption on the spectral shape of fluorescence and found that it is a major cause of overlapping peaks and weak signals. An approach is proposed to purify fluorescent signals and enhance fluorescence signatures based on the theory of fluorescence quantum yield. Using this theory, the problems of noise amplification and singularity points were identified, and an optimization algorithm was proposed related to Wiener filtering . For practical application to multiple compounds, three overlapping cases were discussed theoretically. The effectiveness of this procedure in subsequent parallel factor analysis was assessed and compared with original data by conducting experiments with six typical compounds and real water samples. The results indicate that overlapping along the excitation wavelength axis can be reduced despite the existence of multiple compounds, and the sensitivity of weak fluorescent signals can be significantly improved. The proposed method can enhance fluorescence signatures for the separation and analysis of fluorescent components in water contaminants.
✓ 已验证
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 150
·期 4
·1121-1127
·
IF 2.372
Xu Siquan,Wu Ningxin,Yuan Hui,Chen Yuan,Pan Donghui,Wu Yuanfeng,Fan Jingdeng,Gao Lijing,Xiao Guomin
Abstract Silica-supported hafinum phosphide (HfP/SiO 2 ) was prepared and applied as an effective solid acid catalyst to drive furfural production from xylan. Various characterizations were employed to analyze the intrinsic properties of the HfP/SiO 2 catalyst, and the effects of process parameters on its performance were investigated in detail. The results showed that the performance of the HfP/SiO 2 catalyst was excellent, which allowed up to 85% of the furfural yield to be achieved at 180 °C for 60 min in the water (NaCl) /THF biphasic system. There was no significant decrease in the performance of the HfP/SiO 2 catalyst after seven consecutive cycles. Characterization analysis of the recovered catalyst revealed that its elemental composition and total acidity were maintained, indicating the desired hydrothermal stability of the HfP/SiO 2 catalyst. In addition, by-products produced during xylan conversion were identified as humins and soluble molecular fragments or polymers. Graphic Abstract
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2019
·Vol. 12
·期 2
·642-648
·
IF 4.495
Gang Yuan,Chan Wu,Guorong Zeng,Xiaopo Niu,Guoqiang Shen,Li Wang,Xiangwen Zhang,Rafael Luque,Qingfa Wang
Graphical Harvest from inexhaustible nature : Intermittent renewable electricity can be stored in chemical bonds by atomic economy production of fuels and chemicals from the aqueous solution of biomass over efficient and stable nanoscale electrodes. Electrochemical valorization of non-food biomass-derived carboxylates into fuels is promising for the conversion, storage, and distribution of renewable electricity. Herein, we demonstrate that biofuels, hydrogen, and bicarbonate can be simultaneously produced in an electrochemical cell by one-step electrolysis of free fatty acids under ambient conditions on 3D self-supported ultralow Pt loading (2 wt %) electrode. The three valuable products can naturally separate from each other during the electrolysis in the alkaline aqueous solution. The experimental suggests that Pt(100) and Pt(110) are favorable for the production of non-Kolbe and Kolbe hydrocarbons, respectively. DFT calculation further clarifies the adsorption and stabilization of the reaction intermediates on Pt(100) and Pt(110).
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 22
·5855-5866
·
IF 3.286
Ma Xiaofei,Du Yingxiang,Zhu Xinqi,Feng Zijie,Chen Cheng,Yang Jiangxia
Recently, increasing attention has been given to the research on chiral ionic liquids (CILs) in chiral separation field; however, only a few literatures focus on the exploration of CILs as the sole chiral selector. In this study, an ionic liquid chiral selector based on antibiotic, namely tetramethylammonium clindamycin phosphate (TMA-CP), was originally synthesized and subsequently utilized for enantioseparation in capillary electrophoresis (CE). Remarkably improved separations of eight racemic analytes were achieved in TMA-CP system in contrast to the clindamycin phosphate (CP) system. The optimal separation conditions were determinated by systematic experiments on several crucial parameters including the type and proportion of organic modifier, CIL concentration, buffer pH, and applied voltage. Additionally, molecular modeling with AutoDock was applied to probe into the chiral recognition mechanism of the ionic liquid chiral selectors, which well corresponded with the experimental results. It is the first time that antibiotic-based ionic liquid was exploited as favorable sole chiral selector in CE, and this strategy has paved a new way for development of novel ionic liquids chiral selectors based on antibiotics.
Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2019
·
IF 3.78
Daikun Jia,Xiaoyan Guo,Jiyu He,Rongjie Yang
Endowing rigid polyurethane foam (PUF) with a good fire-retardancy is essential for improving fire safety. Chemical improvement in fire-retardancy by using reactive-type flame retardants is better because of the disadvantages of traditional additive-type flame retardants. A reactive flame retardant tri-glycidyl phosphate (POG), which was synthesized by using phosphorus oxychloride and glycidol , was bound to the cross-linked network structure of PUF. The effects of POG on the physical-mechanical properties, morphology, thermal stability and fire-retardancy of PUF system were systematically investigated. Research results showed that POG resulted in an improvement in the thermal insulation ability and a slight decrease in the compressive strength of PUF. Furthermore, thermogravimetric analysis certified that the thermal stability and the char yield at 700 °C of PUF were significantly enhanced by incorporating POG. The limiting oxygen index increased to 22.3% with rising loading of POG. Moreover, a 30.2% decline in total heat release was achieved, the time to flameout was significantly shortened. Additionally, the vertical burning test illustrated that POG effectively limited the spread of flame and eliminated melt dripping. Further study confirmed that the fire-retardancy of PUF was significantly improved by inhibiting flame in the gas phase and charring in condensed phase.
✓ 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）