ChemSusChem
·
2020
·Vol. 13
·期 14
·3662-3670
·
IF 7.962
Hefeng Yuan,Shiwei Wei,Bin Tang,Zizai Ma,Jinping Li,Manab Kundu,Xiaoguang Wang
Graphical Flakes make O 2 : Self-supported ultrathin CoNiB nanoflakes are prepared by a simple one-step solid-state boronation. The unique sheet-like structure, bimetallic boride components, and optimal hybrid crystalline nature enable a synergistic promotion for the catalysis of the oxygen evolution reaction with long-term stability. The development of highly active and efficient nonprecious-metal electrocatalysts for the oxygen evolution reaction is important for the design of renewable energy production and storage devices. In this work, highly dense, ultrathin Co–Ni boride nanoflakes supported on a 3 D CoNi skeleton are fabricated in situ by a simple one-step, high-temperature, solid-state boronation process. As a result of the induced high electroactive surface area and low charge transfer resistance, CoNiB-700 exhibits high catalytic activity at an overpotential of 262 ( η 10 ) and 284 mV ( η 20 ) to deliver current densities of 10 and 20 mA cm −2 , respectively, with a Tafel slope of 58 mV dec −1 in an alkaline medium towards the oxygen evolution reaction. DFT calculations show that the Ni-regulated Co–B compound has a lower rate-determining energy barrier for the *OOH intermediate than the mono-Co–B compound, which facilitates the production of more active catalytic sites for an accelerated surface charge-transfer process for the oxygen evolution reaction.
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INSTRUMENTATION SCIENCE & TECHNOLOGY
·
2020
·
IF 1.418
Li-Ye Niu,Qi Wang,Wan-Ming Zhao,Jian-Ying Jing
A D-type optical fiber surface plasmon resonance (SPR) sensor based on gold film and Au nanoshells is described. The sensor has a smaller full width at half maximum (FWHM) and a higher quality factor. The influence of the coupling effect between the Au nanoshells and gold film with different internal and external diameter ratios on the sensor was investigated by the finite element method. The simulation results show that the coupling effect between the SPR of the gold film and the localized surface plasmon resonance (LSPR) of the Au nanoshells effectively improved the electric field strength of the sensing region. The refractive index measurements show that the sensitivity of the D-type fiber/gold film/Au nanoshell (50/40 AuNS) SPR sensor is 3064 nm/RIU, which is 993 nm/RIU higher than for the D-type fiber/gold film SPR sensor. The D-type fiber/gold film/Au nanoshell (50/40 AuNS) SPR sensor also provides good linearity with a value of 99.4%. The sensor reported in this paper can be used for reference in the development of high performance biosensors.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2019
·
IF 3.973
Lifen Wang,Pengpeng Xue,Mengqi Tong,Rui Chen,Waigeng Yang,Deli ZhuGe,Jiandong Yuan,Qing Yao,Yingzheng Zhao,Helin Xu
Inflammatory bowel diseases (IBDs) are chronic relapsing disorders of the gastrointestinal tract characterized pathologically by intestinal inflammation and epithelial injury. Laquinimod (LAQ), a poorly water-soluble compound, was proved to be effective for colitis remission at low dose of 0.5 mg/kg in patients with Crohn’s disease. Due to its extremely low solubility in water, it was difficult to develop an injectable liquid dosage form. Herein, D-α-Tocopheryl polyethylene glycol-1000 succinate (TPGS) polymeric micelles were developed as a delivery vehicle of LAQ for the management of inflammatory bowel disease. Using the LAQ/TPGS ratio of 1:100, LAQ-loaded micelles were successfully prepared by thin-film dispersion method. The solubility of LAQ in water was significantly increased from 10.5 μg/mL in pure water to 500 μg/mL in TPGS micelles. LAQ-loaded micelles of TPGS exhibited the fine particle size of 34.6 nm and Zeta potential of -0.67 mV. Moreover, the good stability of LAQ-loaded micelles in physiology-mimicking medium was confirmed by detecting their particle size, zeta potential and leakage of the loading drug. Therapeutic effect of LAQ-loaded micelles on DSS-induced mice was proved by detecting DAI score, colon length and loss of body weight. Moreover, the morphology and colonic mucosal barrier of the injured colon of DSS-induced mice was largely recovered after treatment with LAQ-loaded micelles. Meanwhile, the inflammation of colitis colon was also obviously alleviated by LAQ-loaded micelles. Conclusively, polymeric micelles of TPGS may be a promising delivery vehicle of LAQ for the management of inflammatory bowel disease.
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DYES AND PIGMENTS
·
2023
·
IF 4.5
Yonghe Zhang,Ruonan Zhou,Jie Sun,Peixuan Li,Deyi Wu,Chunyan Yang,Peng Zhang,Zhenghua Ju
A donor-acceptor (D-A) phenothiazine derivative(PZQ) was designed and synthesized. The PZQ was characterized utilizing infrared (FTIR) and 1 H/ 13 C nuclear magnetic resonance. The fluorescence spectra of PZQ were investigated in various solvents with differing polarities to demonstrate the presence of positive solvatochromism was attributed to the intramolecular charge transfer. It was observed that the Stokes’ shifts increased proportionally with the polarity of the solvents, exhibiting a maximum value of 11420 cm −1 in the highly polar solvent (ACN). Moreover, a porous composite (PZQ@ZIF-8) was fabricated by encapsulating PZQ into the metal-organic framework (ZIF-8) to respond to the organic solvent vapors. The PZQ@ZIF-8 was characterized using infrared, X-ray diffraction (XRD). The fluorescence spectra of the PZQ@ZIF-8 displayed significant solvent-dependent emission. Most importantly, the PZQ@ZIF-8 exhibited high reusability, and a specific response to methanol vapor. The emission intensity of the PZQ@ZIF-8 was correlated with methanol vapor concentration negatively, which was essential for the practical sensing application.
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Biomass Conversion and Biorefinery
·
2023
·
IF 4
Gao Xin,Xu Tingting,Shi Yunlin,Bai Zhongzhong,Zhou Jun,Wu Hongli,Cao Fei,Wei Ping
Roots and stems comprise a large proportion of traditional Chinese medicines and often serve as the energy storage units of plants. However, their decoction residues still contain a significant amount of starch, and direct landfilling, incineration, or carbon disposal results in a wastage of resources. In this study, five types of starch-rich traditional Chinese medicine decoction residues (TCMDRs)c, namely, Radix Isatidis Rhizoma Dioscoreae , Rhizoma Corydalis and Fritillaria Thunbergii . Radix Paeoniae Alba were screened and hydrolyzed using amylase-glucoamylase to produce fermentable sugar. The resulting glucose yields were 87.54%, 84.51%, 85.14%, 82.55%, and 87.75%, respectively. The enzymatic hydrolysate, after flocculation-decolorization treatment, was used to produce D-lactic acid and ethanol, resulting in a concentration and yield of 121.11 g/L (0.97 g/g) and 54.17 g/L (0.49 g/g), respectively. When single or mixed starch-rich TCMDRs were directly used as feedstocks for ethanol production via simultaneous saccharification and fermentation (SSF), they exhibited similar ethanol fermentability, with yields ranging from 0.33 to 0.43 g/g. The SSF residues were thermochemically transformed into biochar with a specific surface area of 89–459 m 2 /g to reduce secondary waste generation. The utilization value of starch-rich TCMDRs was significantly improved through the implementation of enzymatic hydrolysis to produce fermentable sugars, anaerobic fermentation to produce D-lactic acid and ethanol, and the utilization of fermentation residues for biochar production. Graphical abstract
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MICROCHEMICAL JOURNAL
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2023
·
IF 4.8
Cai-Fang Liu,Xiao-Yan Ran,Cheng Liu,Yu-lan Zhu,Yan-Rui Lu,Yu-Ping Yang,Bang-Jin Wang,Jun-Hui Zhang,Sheng-Ming Xie,Li-Ming Yuan:
Chiral metal–organic frameworks, an emerging type of chiral porous materials, possess many outstanding characteristics such as high surface area, tunable pore sizes, and good chemical stability. Herein, we prepared a chiral [Zn 2 (D-Cam) 2 (4,4′-bpy)] n @SiO 2 core–shell composite on the SiO 2 -NH 2 microspheres by an in-situ growth method. The prepared [Zn 2 (D-Cam) 2 (4,4′-bpy)] n @SiO 2 -packed column exhibited high-resolution separation of racemic compounds and positional isomers at a low column backpressure (9–12 bar). Twelve pairs of enantiomers including alcohols, amines, epoxides, ketones, and esters were well resolved with sharp peak shapes on the [Zn 2 (D-Cam) 2 (4,4́-bpy)] n @SiO 2 chromatographic column. Compared the separation performance of [Zn 2 (D-Cam) 2 (4,4́-bpy)] n @SiO 2 -packed column and two chromatographic columns (commercial Chiralpak AD-H column and as-prepared SiO 2 -NH 2 column), the [Zn 2 (D-Cam) 2 (4,4′-bpy)] n -packed column and the commercial Chiralpak AD-H column have a good complementarity in chiral separation, and it also offered better separation performance compared to the SiO 2 -NH 2 column for separating positional isomers. The effects of column temperature and analyte mass on the HPLC separation were investigated. Additionally, the [Zn 2 (D-Cam) 2 (4,4́-bpy)] n @SiO 2 packed column has good repeatability and stability for HPLC separation of enantiomers and positional isomers. The relatvive standard deviations (RSDs) for repeated separations of 2,2,2-trifluoro-1-(9-anthryl)ethanol and o , m , p -bromoaniline were less than 0.8 % and 1.2 % for the retention time and peak area, respectively. After continuous use for one month, the RSDs for the retention time and peak area of them were in the range of 1.1–1.3 % and 1.5–1.8 % (inter-day and intra-day, n = 5), respectively. This work also indicates that the chiral MOFs@SiO 2 composites are promising for HPLC separation.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xiaohui Niu,Simeng Yan,Rui Zhao,Hongxia Li,Xiaoyu Liu,Kunjie Wang
In the pursuit of chiral materials with significant chiral recognition effects and stability, various strategies have been explored, among which the integration of metal nanoparticles and chiral metal–organic frameworks (CMOFs) is highly promising. However, metal nanoparticles (MNPs)/CMOFs show high chiral properties but inferior stabilities due to the MNPs being easily detached from the outside layer under certain conditions. Sandwich MOFs@MNPs@CMOF chiral materials can overcome this dilemma because the sandwich structure can maximize the regulation of the chiral interface activity, while the controlled outer layer can stop the MNPs from falling off in the procedure of chiral recognition. Here, a novel sandwich chiral material (d-His-ZIF-8@Au@ZIF-8) was synthesized by a ligand-assisted strategy with a well-defined sandwich morphology and chiral recognition capabilities. The electrochemical chiral recognition showed that d-His-ZIF-8@Au@ZIF-8 was the most efficient for the enantiomer of phenylalanine (Phe). This experiment presents a novel perspective for the fabrication of a chiral electrochemical sensing platform based on a solid sandwich chiral nanocomposite.
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ORGANIC ELECTRONICS
·
2023
·
IF 3.2
Di Zhao,Qiuhong Cui,Xingyu Zhang,Hongyu Ji,Xin Liu,Liang Qin,Yuanyuan Hu,Yanbing Hou,Yufeng Hu,Zhidong Lou,Feng Teng
Organic salt doping is an effective method to control the electrical properties of organic semiconductor materials, while its underlying mechanism remains to be studied. In this work, we report the improvement of organic field-effect transistor (OFET) performance by doping the D-A polymer semiconductor PTB7-Th with organic salts. The underlying mechanism of PTB7-Th's organic salt doping in OFETs has been explored to fill the existing research gap. The doping of organic salts can improve the hole mobility of the device and change the threshold voltage . In addition, at low doping ratios, the on-off ratio of the device is not sacrificed but remains unchanged. Finally, we have made a series of characterizations of the properties of doped polymers through absorption, EPR , and UPS , which provide specific guidelines for modifying D-A polymer devices.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Yimei Zheng,Chengang Zhao,Boyu Chen,Hui Teng,Chao Ai,Lei Chen
In the present study, D-α-Tocopherol polyethylene glycol 1000 succinate-based self-microemulsifying drug delivery systems (TPGS-SMEDDS) were introduced to enhance the solubility and stability of luteolin. The ternary phase diagrams were constructed to obtain the maximum area of microemulsion and suitable formulations of TPGS-SMEDDS. The particle size distribution and polydispersity index of selected TPGS-SMEDDS were analyzed to be less than 100 nm and 0.4, respectively. The thermodynamic stability results suggested that the TPGS-SMEDDS was stable during the heat-cool and freeze–thaw cycle. Moreover, the TPGS-SMEDDS exhibited excellent encapsulation capacity (51.21 ± 4.39 to 85.71 ± 2.40%) and loading efficiency (61.46 ± 5.27 to 102.86 ± 2.88 mg/g) to luteolin. In addition, the TPGS-SMEDDS showed an admirable vitro release ability with a ratio of more than 88.40 ± 1.14% for luteolin in 24 h. Therefore, TPGS-based SMEDDS might provide an effective role for the oral administration of luteolin and holds promise as a potential delivery for poorly soluble bioactive compounds.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 13
·6378-6384
·
IF 3.3
Dongdong Tan,Tianmiao Wang,Jing Hu,Donglian Deng,Tingting Li,Ruijun Li
Considering chiral covalent organic frameworks (COFs) featuring the intriguing properties of porous organic materials, chiral recognition, and separation, the design and synthesis of chiral COFs with high crystallinity has remained a daunting challenge. A brominated functionalized COF (COF-Br) with high crystallinity and stability was synthesized. Using the post-synthetic modification strategy of the Suzuki–Miyaura cross-coupling reaction, a chiral COF (COF-L-Phe) was successfully constructed by combining COF-Br and the chiral functional groups of 4-borono-L-phenylalanine. The chiral recognition ability of COF-L-Phe was verified using an experimental adsorption model. Furthermore, COF-L-Phe-modified capillary columns have been used for the separation of racemic phenylalanine using capillary electrochromatography. This work will provide guidance for constructing chiral COFs for chirality related applications.
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Metals
·
2023
·Vol. 13
·期 4
·649
·
IF 2.9
Xiaoxi Ruan,Linlin Yang,Yan Wang,Yizhe Dong,Dake Xu,Mingxing Zhang
The corrosion of carbon steel causes dramatic economic losses each year. Since conventional corrosion prevention approaches may cause pollution problems to the environment, ecofriendly and effective corrosion approaches are desired. Microbiologically influenced corrosion inhibition (MICI) has been reported as a sustainable corrosion prevention method. This work aims to evaluate the corrosion inhibition effect of two bacterial strains,Tenacibaculum mesophilumD-6 andBacillussp. Y-6 by choosing Q235 carbon steel as a model system. Scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and a series of electrochemical techniques were applied to study the corrosion prevention effect. The electrochemical and pitting results indicated thatT. mesophilumD-6 displayed a better corrosion protection effect.T. mesophilumD-6 formed a denser and thicker biofilm on the Q235 surface thanBacillussp. Y-6. The maximum thickness of theT. mesophilumD-6 biofilms was 11.6 ± 0.7 μm, which is about twice as thick than that ofBacillussp. Y-6. The corrosion prevention mechanism was ascribed to the formation of biofilms as a barrier to block corrosive agents such as O2. This study provides a theoretical foundation for the application of biofilms as green and effective corrosion inhibitors for carbon steel.Keywords:Q235 carbon steel;Tenacibaculum mesophilumD-6;Bacillussp. Y-6;corrosion inhibition;biofilm formation ability
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WATER RESEARCH
·
2023
·
IF 12.8
Wei-Ran Han,Wen-Long Wang,Tie-Jun Qiao,Wei Wang,Hang Su,Chen-Xin Xu,Qian-Yuan Wu
Micro-bubble aeration is an efficient way to promote ozonation performance, but the technology is challenged by extensive energy cost. Here, a ceramic ultrafiltration membrane was used to achieve ozone micro-bubble (0–80 µm) aeration in a simple way at gaseous pressures of 0.14–0.19 MPa. Compared with milli-bubble aeration, micro-bubble aeration increased the equilibrium aquatic O 3 concentrations by 1.53–3.25 times and apparent O 3 transfer rates by 3.12–3.35 times at pH 5.0–8.0. Consequently, the • OH yield was 2.67–3.54 times via faster O 3 transfer to the aquatic solution followed by decomposition rather than interfacial reaction. Ozone micro-bubble aeration outperformed milli-bubble aeration, with the degradation kinetics of 2,4-D being 3.08–4.36 times higher. Both O 3 -oxidation and • OH oxidation were important to the promotion with the contributions being 35.8%-45.9% and 54.1%-64.2%, respectively. The operational and water matric conditions influenced the oxidation performance via both O 3 oxidation and • OH oxidation, which is reported for the first time. In general, the ceramic membrane offered a low-energy approach of ozone micro-bubble aeration for efficient pollutant degradation. The O 3 oxidation and • OH oxidation were proportionally promoted by ozone micro-bubble due to O 3 transfer enhancement. Thus, the promotive mechanism can be interpreted as the synchronous enchantment on ozone exposure and • OH exposure for the first time.
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