Journal of Materials Chemistry C
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2019
·Vol. 7
·期 18
·5442-5450
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IF 6.641
Zhishuai Yuan,Wei Huang,Shoutao Ma,Gang Ouyang,Wei Hu,Wei Zhang
Hybrid organic–inorganic lead halide perovskites (CH3NH3PbX3, X = Cl, Br, or I) are deemed to be the highest potential semiconducting materials due to their unique optoelectronic properties. Nowadays, most perovskite photodetectors are fabricated on the basis of thin films, and their performances are limited by the low carrier mobility and high trap density of the thin films. Herein, a high performance photodetector was fabricated via a method involving inversion temperature precision gradient crystallization (ITPGC) for the first time, which is an improvement on traditional methods. The structure of the bulk single crystal is confirmed via XRD and TEM characterization. Also, in terms of nucleation and growth theory, the growth mechanism is explained in detail and the best growth temperature is suggested to be 80 °C for the first time. Benefiting from this, a photodetector with ultra-high responsivity of 7.97 A W−1 is obtained, which is superior to thin film photodetectors. Also, a rise time of 1.27 ms and a fall time of 1.84 ms are obtained, which are regarded as pioneering values for this type of system. Meanwhile, the study also provides new ideas for the preparation of bulk single crystals.
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Nanoscale
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2019
·Vol. 11
·期 27
·13126-13138
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IF 6.97
Yurui Zhou,Lu Li,Shenghui Li,Shufei Li,Miao Zhao,Qinghong Zhou,Xiaoqun Gong,Jin Yang,Jin Chang
Diabetic cataracts (DCs) are one of the most common ocular complications of diabetes, and easily causes blindness among diabetics. However, there are limited drugs to delay and prevent DCs. Research studies indicate that oxidative damage of the crystalline lens and nonenzymatic glycosylation of the lens protein play a key role in the pathogenesis of DCs. Hence, we developed a kind of autoregenerative redox nanoparticle, which was CeO2 NPs coated with PEG-PLGA (PCNPs). We first found that PCNPs could work not only as an antioxidant to protect lens epithelial cells from oxidative stress based on the repetitive elimination of reactive oxygen species (ROS), but also as a glycation inhibitor effectively restraining α-crystallin glycation and crosslinking, thereby keeping the lens transparent and alleviating DCs. Experimental results successfully validated the fact that the PCNPs were able to operate in eyes for a long time to attenuate lens opacity. We expect that this strategy will provide promising potential for the treatment of DCs.
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Biomicrofluidics
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2019
·Vol. 13
·期 4
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IF 2.531
Fang Chen,Du Dan,Li Dongning,Huang Jie,Tu Yifeng
Herein, a novel cell-based electrochemiluminescent (ECL) sensing matrix was developed for probing reactive oxygen species (ROSs) produced from mouse macrophage cells. Uniformly sized Au nanoparticles (AuNPs) with an average diameter of 16 nm were decorated on the surface of indium tin oxide (ITO) glass through the connection of hydrolyzed 3-aminopropyl trimethoxysilane (APTMS) serving as a sensor substrate. Then, the surface was covered with a poly- l -lysine thin film, where mouse macrophage cells were successfully cultured. The morphology of the electrodes obtained was characterized by scanning electron microscopy and atomic force microscopy, and their electrochemical properties were investigated by electrochemical impedance spectroscopy. A linear response was observed from the AuNPs/APTMS/ITO substrate with a sensitivity of 0.465 units per mg/l of H 2 O 2 , and a higher sensitivity of 207 units per mg/l of zymosan. Thereafter, a factor of 84 molecules of H 2 O 2 produced by a single glycogen was estimated. The results demonstrated that the ECL response of this cell-based sensor quantitatively correlated with yielded ROSs during cell oxygen metabolism under the stimulation of zymosan. This work suggests that the prepared sensing matrix is efficient for monitoring the oxygen metabolism of living cells and can be applied in biological and clinical fields to provide significant information on the regular or abnormal function of cells.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
·
IF 3.375
Hai Wang,Yeqing Wang,Hua Xu,Hang Zhou,Liang Wang,Xiangju Meng,Feng-Shou Xiao
Hydration of nitriles has been practically used for the production of amides, wherein the homogeneous catalysts including acids/bases and metal complexes are generally employed. Here, we report that nanorod manganese oxide (NR-MnO2) as a sustainable and low-cost heterogeneous catalyst is highly active and selective for the hydration of aromatic, heterocyclic, and aliphatic nitriles into the corresponding amides. The catalytic properties of NR-MnO2 significantly outperform that of commercial Pd/C and Ru/C catalysts and even the state-of-the-art homogeneous catalysts in the literature. In the continuous recycling tests, the NR-MnO2 catalyst exhibited excellent durability with negligible deactivation, which offers a good opportunity for practical production of these chemicals in the future.
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RSC Advances
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2019
·Vol. 9
·期 46
·27032-27041
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IF 3.049
Ding Ding,Bowei Du,Chao Zhang,Fakhar Zaman,Yaqin Huang
To date, many researchers have developed active components that are derived from seafood processing for the purposes of healthcare. Here, an antioxidant collagen peptide was obtained from skipjack tuna (Katsuwonus pelamis) bone by using a combination of trypsin and chymotrypsin as the catalyst. The amino acid sequence of the peptide was identified as Ser–Ser–Gly–Pro–Pro–Val–Pro–Gly–Pro–Met–Gly–Pro–Met–Gly–Pro–Arg (SSGPPVPGPMGPMGPR) by liquid chromatography-electrospray ionization quadrupole time-of-flight mass spectrometry (LC-ESI-QTOF-MS) analysis. We found that the as-prepared collagen peptide can efficiently scavenge DPPH radical (IC50 3.149 mM), superoxide anion radical (IC50 3.803 mM) and ABTS radical (IC50 9.489 mM). In addition, it has been found that the methionine (Met) residue in the collagen peptide could provide a precise active site during the scavenging of DPPH radicals by Fourier transform infrared spectroscopy (FTIR) analysis and matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry analysis. These results suggest that the peptide can find wide uses in the food, cosmetic and pharmaceutical industries.
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CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Wanqing Li,Yuhang Li,Hongquan Fu,Guangxing Yang,Qiao Zhang,Shengzhou Chen,Feng Peng
A novel phosphorus-doped Co 9 S 8 and carbon nanosphere composite (Co 9 S 8 /P@CS) was successfully prepared by adding a certain amount of sodium hypophosphite during the thermal treatment process of preparing Co 9 S 8 . The results of XRD and XPS confirmed the incorporation of phosphorus into the lattice of Co 9 S 8 . Electrochemical tests demonstrated that Co 9 S 8 /P@CS performs a high electrocatalytic activity for oxygen evolution reaction (OER). Under the current density of 10 mA cm −2 , Co 9 S 8 /P@CS-1:2 as the best catalyst has the lowest overpotential of 233 mV and Tafel slope of 48 mV dec –1 , which is far superior to the current noble-metal catalyst IrO 2 (414 mV, 96 mV dec –1 ). A rechargeable Zn-air battery was assembled with Co 9 S 8 /P@CS-1:2 as the air-electrode catalyst. Its maximum power density reached 142.50 mW cm −2 at 0.56 V and the current density was 255.47 mA cm −2 , significantly higher than those of the battery made by Pt/C-IrO 2 catalysts. Especially, after 350 h (1050 cycles) of charge and discharge, the performance of this assembled battery did not show a significant decrease, predicting a broad application prospect. In-situ Fourier transform infrared spectroscopy (FTIR) and density functional theory (DFT) calculations were used to analyze the active sites of catalyst and catalytic mechanism, revealing the relationships between structure and the catalytic performance for OER.
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CHEMICAL ENGINEERING JOURNAL
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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.
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Nanomaterials
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2018
·Vol. 8
·期 3
·133
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IF 3.504
Ting Xu,Wen Jin,Zhenzhen Wang,Haiyan Cheng,Xinhua Huang,Xiaoyu Guo,Ye Ying,Yiping Wu,Feng Wang,Ying Wen,Haifeng Yang
A non-invasive method for detecting glucose is pursued by millions of diabetic patients to improve their personal management of blood glucose. In this work, a novel CuO nanoparticles (NPs) decorated polycaprolactone@polypyrrole fibers modified indium-tin oxide (denoted as CuO/PCL@PPy/ITO) electrode has been fabricated by electrospinning combined with the electrodeposition method for non-enzymatic detection of glucose in saliva fluid. The electrospun composite fibers exhibit high sensitivity for the glucose detection. The synergistic effect between CuO and PPy together with the unique three-dimensional net structure contributes the reliable selectivity, good test repeatability, large-scale production reproducibility in massive way, the reasonable stability and a high catalytic surface area to the sensor. Quantitative detection of glucose is determined in the linear range from 2 μM to 6 mM and the lowest detection limit is 0.8 μM. The CuO/PCL@PPy/ITO electrode shows potential for the non-invasive detection of salivary glucose.Keywords:electrospinning;polycaprolactone;polypyrrole;CuO NPs;non-enzymatic sensor;glucose in saliva
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JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2018
·Vol. 56
·期 9
·968-976
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IF 2.588
Hui Li,Lin Gu
Controllable synthesis of bio-based polylactide (PLA) diols was realized by the ring-opening polymerization (ROP) of lactide (LA) in the presence of 1,4-butanediol (BDO) using 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) as an organocatalyst in solvent-free conditions. The catalytic activity and conversion of LA could reach ∼1 kg g −1 DBU and >97%, respectively, and the polymerization yielded polymers with narrow polydispersity index (PDI) (1.15–1.29). Interestingly, the number average molecular weight ( M n ) of the obtained PLA diol was in excellent linear relation with the molar ratio of LA and BDO, and hence can be precisely controlled. The structure of the diol was clearly confirmed by 1 H and 13 C NMR, FTIR, and MALDI-TOF mass spectra, proving BDO as an initiation-transfer agent to participate in the polymerization. Kinetic study of the ROP demonstrates a pseudo-first-order kinetic model and a controlled “living” nature. Notably, it is found that the glass transition temperature ( T g ) of the diol significantly depends on the M n . Furthermore, various chain transfer agents and organocatalysts can also be used to successfully synthesize well-defined PLA diols. Especially, functional bio-based dihydric alcohols such as 2,5-furandimethanol (FDMO)-initiated ROP in this system could result in fully bio-based PLA diols with functionality. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018 , 56 , 968–976
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2018
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IF 6.653
Junjian Zheng,Zhiwei Wang,Jinxing Ma,Shaoping Xu,Zhichao Wu
Inability to remove low-molecular-weight anthropogenic contaminants is a critical issue in low-pressure membrane filtration processes for water treatment. In this work, a novel electrochemical ceramic membrane filtration (ECMF) system using TiO2@SnO2–Sb anode was developed for removing persistent p-chloroaniline (PCA). Results showed that the ECMF system achieved efficient removal of PCA from contaminated waters. At a charging voltage of 3 V, the PCA removal rate of TiO2@SnO2–Sb ECMF system under flow-through mode was 2.4 times that of flow-by mode. The energy consumption for 50% of PCA removal for TiO2@SnO2–Sb ECMF at 3 V under flow-through mode was 0.38 Wh/L, much lower than that of flow-by operation (1.5 Wh/L), which was attributed to the improved utilization of the surface adsorbed HO· and dissociated HO· driven by the enhanced mass transfer of PCA toward the anode surface. Benefiting from the increased production of reactive oxygen species such as O2•–, H2O2, and HO· arising from excitation of anatase TiO2, TiO2@SnO2–Sb ECMF exhibited a superior electrocatalytic activity to the SnO2–Sb ECMF system. The degradation pathways of PCA initiated by OH· attack were further proposed, with the biodegradable short-chain carboxylic acids (mainly formic, acetic, and oxalic acids) identified as the dominant oxidized products. These results highlight the potential of the ECMF system for cost-effective water purification.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2018
·Vol. 93
·期 9
·2691-2700
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IF 2.587
Zhuqing Wang,Pengxiang Jin,Min Wang,Genhua Wu,Jiayin Sun,Yujie Zhang,Chen Dong,Aiguo Wu
BACKGROUND In this study, a low-cost and environment-friendly alginate–chitosan hybrid adsorbent (depicted as Alg-Chi) was developed for the removal of Pb 2+ from water. RESULTS Experimental results showed that the Alg-Chi exhibits high selectivity and affinity for Pb 2+ . The selectivity coefficients of the Alg-Chi for Pb 2+ /Cr 3+ , Pb 2+ /Co 2+ Pb 2+ /Cd 2+ , Pb 2+ /Zn 2+ , and Pb 2+ /Cu 2+ are all >5. It can uptake 96.8% of Pb 2+ from Pb 2+ -containing solutions (1.5 mmol L −1 ), and the maximum adsorption capacity for Pb 2+ reaches 468.5 mg g −1 , which is higher than that of most reported adsorbents for Pb 2+ . Moreover, the Alg-Chi can also be regenerated via simple acid elution and used repeatedly without loss in adsorption ability. CONCLUSIONS Analysis of the adsorption mechanism indicated that the Alg-Chi adsorbed Pb 2+ mainly through ion exchange and chemical coordination. Green and low-cost raw materials, simple preparation process, efficient removal efficiency and recyclable, these characteristics give the synthetic Alg-Chi broad application prospects in the field of Pb 2+ -containing wastewater treatment. © 2018 Society of Chemical Industry
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ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Tao Yang,Xiaodong Tian,Xiao Li,Yan Song,Zhanjun Liu,Quangui Guo
In this work, a smart architecture (Si@void@C@TiO 2 ) with hierarchical micro/mesopores is fabricated by in situ construction. Anatase-TiO 2 particles are self-assembly anchored on the Si@void@C and some are potentially filling into the large mesopores of Si@void@C and then form incomplete cover followed by annealing. The unique cooperative coating not only offers stronger protections on account of Ti O C bond which increases the adhesion, but also optimizes the distribution of micro/mesopores, and thus provides fast electrons/ions transportation channels to active materials. As a consequence, the unique structure endows the electrode better rate capability and more superior cycling stability with 0.11% decay per cycle than Si@void@C (0.30% decay per cycle), manifesting the dominance of the incomplete cover for Si-based anodes.
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