Materials
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2019
·Vol. 12
·期 12
·1950
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IF 2.972
Shengding Chang,Muwei Ji,Changxu Yan,Kai Zhang,Qian Deng,Jian Xu,Caizhen Zhu,Bo Li,Jin Wang
KTaO3/Au hetero-nanostructures were synthesized by in-situ reduction of HAuCl4on the surface of hydrothermally-grown KTaO3sub-micron cubes. The concentration of Au source was found to be a critical factor in controlling the hetero-nucleation of Au nanoparticles on the surface of KTaO3sub-micron cubes. Loading of Au particles on KTaO3nanocrystals enriched KTaO3additional UV-vis absorption in the visible light region. Both KTaO3and KTaO3/Au nanocrystals were shown to be active in the photo-degradation of p-nitrophenol, while the loading of Au on KTaO3clearly improved the photo-degradation efficiency of p-nitrophenol compared to that on bare KTaO3nanocrystals, probably due to the improved light absorption and charge separation.Keywords:in-situ synthesis;KTaO3/Au hetero-nanostructures;concentration of Au source;photo-degradation of p-nitrophenol
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Chunli Zhou,Dengke Wang,Ang Li,Erzhuang Pan,Haiyan Liu,Xiaohong Chen,Mengqiu Jia,Huaihe Song
Porous carbon (PC) materials are the excellent alternative to anodes of high performance sodium ion batteries (SIBs). However, most PC materials are prepared with complicated and multi-step template method, which limits the mass production. Herein, we present a simple and repeatable calcination approach to synthesize three-dimensional porous carbon (3D-PC) materials using poly( p -phenylenediamine) hydrogel as precursor. N, O and P heteroatoms are successfully introduced into 3D-PC to provide more sodium storage sites. The obtained 3D-PC delivers high sodium storage capacity of 332 mAh g −1 at 50 mA g −1 and the reversible capacity still retains 139 mAh g −1 at 10 A g −1 . Moreover, 3D-PC also shows ultralong cycling life, the stable capacities of 212 mAh g −1 and 120 mAh g −1 after 1000 cycles even at the high current density of 0.5 A g −1 and 5 A g −1 , respectively. These results illustrate that 3D-PC electrode displays great rate capability and excellent cycling stability, which would be ascribed to surface-dominated sodium storage mechanism according to quantitative analysis. This method is low cost and effective for preparing high-performance porous carbon anodes for SIBs.
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Polymer Chemistry
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2018
·Vol. 9
·期 14
·1827-1839
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IF 4.927
Tengfei Liu,Xiaoyan Liu,Hui Xiong,Cheng Xu,Jianxu Yao,Xiumei Zhu,Jianping Zhou,Jing Yao
D-α-Tocopheryl polyethylene glycol 1000 succinate (TPGS) and TPGS based conjugates have been widely researched for treatment of multidrug-resistant (MDR) cancer. Nevertheless, the influence of structural modification of TPGS on its properties and function requires further exploration. In this study, a hypothesis for the interaction between TPGS and P-glycoprotein (P-gp) at the molecular level has been proposed based on the existing limited knowledge of TPGS inhibition on P-gp. Two TPGS derivatives, TPGS–glycyrrhetinic acid conjugate (TGA) and TPGS–lactobionic acid conjugate (TLA), were synthesized. Molecular docking and molecular dynamics (MD) simulations were employed to investigate the P-gp inhibitory ability of TPGS and its derivatives and their inhibitory mechanism. Moreover, a systematic in vitro experiment was conducted to further confirm simulation results and evaluate antitumor effects. It was found that TLA and TGA displayed higher binding affinities with P-gp than TPGS, which was attributed to their properties of hydrophilicity and negative charge. Meanwhile, TPGS and its derivatives prevented the P-gp ATPase from hydrolyzing ATP by blocking the ATP binding sites, thereby inhibiting P-gp function. It was also found that the high hydrophilic–lipophilic balance (HLB) of the polymer contributed to a significant MDR reversing effect. In addition, TLA and TGA could promote intercellular accumulation and noticeably enhance the cytotoxicity of DOX in HepG2 and HepG2/ADR cells compared to TPGS. This work may be an important step in understanding the structure–activity relationships (SARs) of TPGS and its derivatives, the roles of the three polymers in MDR reversal mechanisms and in designing promising excipients for reversing MDR. The results suggested that TLA and TGA can be used as potential P-gp inhibitors or nanocarriers in the field of drug delivery.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
·
IF 3.909
Lin Shao,Yang Cao,Zhanying Li,Wenbin Hu,Shize Li,Lingbin Lu
Alginate was grafted with NIPAM and NHMAM successfully, and a new responsive copolymer, alginate-g-P(NIPAM-co-NHMAM), was obtained. A novel dual responsive polysaccharide-based aerogel with thermo/pH sensitive properties was designed from the copolymer as drug controlled release system. The chemical structure of the copolymer was characterized by FT-IR and 1 H NMR. Lower critical solution temperature (LCST) of the copolymer covered a wide temperature range from 27.6 °C to 42.2 °C, which could be adjusted with changing the ratio between NIPAM and NHMAM. The dual responsive aerogel had a three-dimensional network structure. As a drug controlled release system, the aerogel was high responsive to both temperature and pH with drug loading efficiency up to 13.24%. Above LCST, the aerogel had a faster drug release, and drug was completely released in neutral environment, while the drug release was obstructed in acid environment. Furthermore, the drug release mechanism of the aerogel was illuminated. These results indicated that the dual responsive aerogel was a promising candidate for drug carriers.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Xuan Fu,Long Sheng,Yisha Yu,Meihu Ma,Zhaoxia Cai,Xi Huang
Fluorescence resonance energy transfer (FRET), a near-field energy transfer from a fluorescent donor to a fluorescent acceptor within close proximity, has been widely used in biosensing. In this study, a rapid and universal sensor for the detection of ovalbumin (OVA) using nitrogen, oxygen, phosphoric co-doped CDs (NOP-CDs) and graphene oxide (GO) was established based on the FRET technology. First, novel NOP-CDs peak at 443 nm were synthesized by a one-pot hydrothermal method using egg powder and phosphorus acid. Then, in the absence of OVA, the fluorescence of OVA-antibody modified NOP-CDs was quenched by GO via electrostatic attraction and π-π stacking interaction due to the FRET effect. The introduced OVA competed to displace the GO by special binding with the anti-OVA, resulting in the recovery of the fluorescence. This sensor displayed a linear response to OVA from 0.5 to 15 μg/mL with a detection limit of 153 ng/mL and was successfully applied to the detection of the OVA sample with recoveries ranging from 99.25 to 118.90%. In summary, the green and easy-to-synthesize nano-material was used in this method, the accurate detection results, and the simple process exhibited the great potential of this method for practical applications.
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ChemSusChem
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2018
·Vol. 11
·期 13
·2156-2164
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IF 7.411
Feng Li,Jing Li,Jie Zhang,Lili Gao,Xuefeng Long,Yiping Hu,Shuwen Li,Jun Jin,Jiantai Ma
Graphical Dope to promote : A high-performance photoanode consisting of NiO nanoparticles anchored on a gradient P-doped α-Fe 2 O 3 nanorod array (NiO/P-α-Fe 2 O 3 ) is successfully fabricated. The electrochemical results show that the photoanode presents a high photocurrent density and long-term stability for improved water oxidation. The photoelectrochemical (PEC) water-splitting efficiency of a hematite-based photoanode is still far from the theoretical value due to its poor surface reaction kinetics and high density of surface trapping states. To solve these drawbacks, a photoanode consisting of NiO nanoparticles anchored on a gradient phosphorus-doped α-Fe 2 O 3 nanorod (NR) array (NiO/P-α-Fe 2 O 3 ) was fabricated to achieve optimal light absorption and charge separation, as well as rapid surface reaction kinetics. Specifically, a photoanode with the NR array structure allowed a high mass-transport rate to be achieved, while phosphorus doping effectively decreased the number of surface trapping sites and improved the electrical conductivity of α-Fe 2 O 3 . Furthermore, the p–n junction that forms between NiO and P-α-Fe 2 O 3 can further improve the PEC performance due to efficient hole extraction and the water oxidization catalytic activity of NiO. Consequently, the NiO/P-α-Fe 2 O 3 NR photoanode produced a high photocurrent density of 2.08 mA cm −2 at 1.23 V versus a reversible hydrogen electrode and a 110 mV cathodic shift of the onset potential. This rational design of structure offers a new perspective in exploring high-performance PEC photoanodes.
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Molecular Catalysis
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2018
·
IF 0
Cheng Liang,Xuefeng Li,Diefeng Su,Qiyi Ma,Jianyong Mao,Zhirong Chen,Yong Wang,Jia Yao,Haoran Li
Efficient aerobic oxidation has been developed for the selective preparation of a sequence of valuable p -hydroxybenzaldehydes from corresponding p -cresols, using a new magnetically separable catalyst of nano-structured cobalt–cobalt oxide/nitrogen-doped carbon (CoO x @CN) material. CoO x @CN showed high activity for the 2-methoxy-4-cresol oxidation to vanillin, giving great yield (90%) and with good turnover number (210), as well as other p -cresols in good to great yields. The catalytic performance was investigated and related to the structural, chemical and magnetic properties which determined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR) and vibrating sample magnetometer (VSM). The effects of base to substrate molar ratio, catalyst concentration, temperature, and solvent on the conversion and selectivity patterns also have been studied. The investigation revealed that remarkable catalytic properties of CoO x @CN could be ascribed to the active species cobalt oxide, doped nitrogen and porous carbon with large surface area. The size of the catalyst is a key factor for catalyst performance. The ferromagnetic property of catalyst enables to recycle easily by an external magnetic field and reuse six successive times without significant activity loss.
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ANALYTICAL SCIENCES
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2018
·Vol. 35
·期 2
·147-152
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IF 1.355
Ju Yan Jun,Li Na,Liu Shi Gang,Fan Yu Zhu,Ling Yu,Xiao Na,Luo Hong Qun,Li Nian Bing
A fluorescence method for the determination of picric acid (PA) using phosphorus-doped carbon dots (P-CDs), synthesized from β-cyclodextrin and sodium pyrophosphate, is described. The P-CDs are very uniform and monodisperse with a diameter of about 2.8 nm. Under an excitation of 350 nm, the P-CDs emit bright blue fluorescence with an emission peak at 440 nm. The as-synthesized P-CDs serve as a sensitive, selective, and label-free fluorescent probe for the detection of PA. Based on an inner filter effect between PA and P-CDs, a linear response is obtained for PA from 0.1 to 10 μM with a detection limit of 82 nM. Finally, this sensing system has been demonstrated to have practicability for PA detection in the environmental water samples.
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CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Ying Liu,Xiaoyan Chen,Yulin Yang,Yong Feng,Deli Wu,Shun Mao
Cobalt-based nanostructures have shown a great potential for radical production by activating persulfate (PS). Here, we report a facile strategy to synthesize nitrogen-doped porous Co@C nanoboxes (Co@NC) by pyrolysis of zeolitic imidazolate frameworks (ZIF-67), followed by partially etching away the metallic cobalt. With a nitrogen-enriched hollow porous carbon nanobox and embedded Co nanoparticles, the Co@NC shows high efficiency in PS activation for p-Chloroaniline (PCA) removal. The degradation study shows that a complete removal of high concentration PCA is done within two minutes, which is superior to most of the reported PCA removals with PS-based advanced oxidation processes (AOPs). More importantly, the Co@NC exhibits high catalytic activities in a wide range of pH from 5 to 9. The Co@NC also shows very limited Co 2+ release with a dissolution proportion of 0.28%, much lower than previously reported Co-based catalysts, and remains high efficiency after five successive reaction cycles. A heterogeneous activation mechanism though surface reaction is proposed, in which PCA firstly absorbs on the carbon nanobox surface, then being oxidized by generated radicals and non-radical species. The unique structure and outstanding performance of Co@NC catalysts present new insights in catalyst design for PS-based advanced oxidation for organic pollutants removal in waste water.
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ChemNanoMat
·
2017
·Vol. 4
·期 2
·213-219
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IF 2.937
Xuan Cai,Libo Shi,Hongli Zhao,Minbo Lan
Graphical It's super ! The p-n junction was introduced to electrochemical catalysts for superoxide detection. Based on the superoxide dismutase mimic activity of CeO 2 and the high electrochemical catalytic activity of CuO, a non-enzymatic superoxide sensor was established. Owing to the construction of a p-n heterojunction, the sensing performances of p-CuO/n-CeO 2 composites were further enhanced. This method could serve as an effective strategy to overcome the intrinsic defects of semiconductor catalysts and improve their applications in electrochemical sensors. The performance of electrochemical sensors is mainly limited by the intrinsic properties of electrocatalysts fabricated on the electrode. Introducing a p-n heterojunction into semiconducing electrocatalysts is an effective strategy to enhance the sensing performance. In this paper, p-n-heterojunction-based CuO/CeO 2 nanocomposites were synthesized by a simple hydrothermal process, and the effect of different Cu/Ce molar ratios was explored. p-CuO/n-CeO 2 was found to exhibit higher conductivity and electrocatalytic activity toward the target superoxide anion (O 2 .− ) when compared to both bare CuO and CeO 2 . Characterization shows that different Cu/Ce ratios in p-CuO/n-CeO 2 materials result in a considerable variation in the Ce 3+ /Ce 4+ level, and energy band gap of CeO 2 , greatly affecting the electrochemical performance of p-CuO/n-CeO 2 . Under optimized conditions, these sensors exhibit high sensitivity and low detection limit toward O 2 .− . These results demonstrate that the performance of semiconductor-based electrochemical sensors may be enhanced by the electron-transfer process of p-n junction interfaces.
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Frontiers of Materials Science
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2017
·Vol. 11
·期 3
·223-232
·
IF 1.471
Wei Lulu,Lu Beibei,Li Lei,Wu Jianning,Liu Zhiyong,Guo Xuhong
A novel β-cyclodextrin-poly(2-(2-methoxyethoxy)ethyl methacrylate)- co -poly(ethylene glycol) methacrylate (abbreviated as: β-CD-(P(MEO 2 MA- co -PEGMA)) 21 ) was prepared by using the one-step strategy, and then the star-shaped copolymers were used in the atom transfer radical polymerization (ATRP). The structure of star-shaped β-CD-(P(MEO 2 MA- co -PEGMA)) 21 copolymers were studied by FTIR, 1 H NMR and gel permeation chromatography (GPC). The star-shaped copolymers could self-assembled into micelles in aqueous solution owing to the outer amphiphilic β-CD as a core and the hydrophilic P(MEO 2 MA- co -PEGMA) segments as a shell. These thermo-responsive starshaped copolymers micelles exhibited lower critical solution temperature (LCST) in water, which could be finely tuned by changing the feed ratio of MEO 2 MA to PEGMA. The LCST of star-shaped β-CD-(P(MEO 2 MA- co -PEGMA)) 21 copolymer micelles were increased from 35°C to 58°C with the increasing content of PEGMA. The results were investigated by DLS and TEM. When the temperature was higher than corresponding LCSTs, the micelles started to associate and form spherical nanoparticles. Therefore, β-CD-(P(MEO 2 MA- co -PEGMA)) 21 star-shaped copolymer micelles could be potentially applied in nano-carrier, nano-reactor, smart materials and biomedical fields.
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FLUID PHASE EQUILIBRIA
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2017
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IF 2.473
Kai Kang,Xiaopo Wang
The experimental measurements for liquid densities of n -decane and p -xylene binary mixtures were performed over the entire composition with a high-pressure vibrating-tube densimeter. The temperature ranges for the present measurement were from 293.15 K to 363.15 K and the pressures were reached to 60 MPa. The experimental uncertainty is estimated to be 0.001 with 0.95 confidence level. Experimental density values were fitted by the modified Tammann–Tait equation. The PC-SAFT equation of state and Cibulka's equation was used to predict the densities of n -decane and p -xylene and its mixtures. In addition, derived volumetric properties, such as the excess molar volumes , the isothermal compressibility , and isobaric thermal expansivity, were calculated from the experimental density data. The effects of pressure and temperature on the derived properties were also discussed.
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