APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Xu Yan,Zipeng Xing,Yan Cao,Mengqiao Hu,Zhenzi Li,Xiaoyan Wu,Qi Zhu,Shilin Yang,Wei Zhou
In-situ C-N-S-tridoped single crystal black TiO 2 nanosheets with exposed {001} facets are successfully fabricated via a facile hydrothermal method combined with an in-situ solid-state chemical reduction approach, followed by calcination at 450 °C. The crystal structure, crystallinity, morphology and composition of the as-prepared samples are investigated through X-ray diffraction, Raman, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV–vis diffuse reflectance spectroscopy, respectively. The results suggest that the obtained C-N-S-tridoped single crystal black TiO 2 nanosheets exhibit uniform nanosheet-like structure with exposed {001} facets and average length of ∼300–400 nm, thickness of ∼20 nm. The visible-light photocatalytic degradation rate of methyl orange is up to 92.13%, and photocatalytic hydrogen evolution is 149.7 μmol h −1 g −1 . The excellent photocatalytic activity can be ascribed to the synergetic effect of surface heterojunction between {001} and {101} facets, the C-N-S-tridoping, and the formed Ti 3+ species in photocatalyst, which can not only favor the visible-light absorption but also facilitate the separation and transfer of photogenerated charges.
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Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 16
·3415-3421
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IF 5.066
Haiqin Wu,Lan Jin
In this study, new facile, economical and fluorescent ultrathin films (UTFs) for detection of tiopronin are developed. The UTFs have been fabricated by combining the alizarin red S–boric acid adduct (ARS–H3BO3) with MgAl layered double hydroxide (LDH) nanoparticles through the layer-by-layer (LBL) assembly technique. UV-vis, fluorescence spectroscopy, XRD, SEM and AFM have been adopted to monitor the assembly process. The UTFs display a uniform morphology and a periodic layered structure. Using ARS as a probe, which does not emit fluorescence by itself but displays fluorescence when complexed with boron, the assembled ARS–H3BO3/LDH UTFs display a high luminescence response to tiopronin. In the presence of Cu2+, the fluorescence of UTFs was quenched, which is attributed to the complexation between Cu2+ and ARS. Upon adding tiopronin to the UTF–Cu system, tiopronin would form a complex with Cu2+ preferentially, leading to the increased fluorescence of UTFs. Based on the above mechanism, a turn-on fluorescent ensemble for tiopronin is developed. A linear response was obtained in the range of 0–80 ng mL−1, with a detection limit of 0.47 ng mL−1. Compared with ARS and other analytes, the tighter binding of tiopronin to Cu2+ led to an assay with high specificity. Therefore, this work provides a facile LBL strategy for the fabrication of a solid state sensor based on ARS dye for detection of tiopronin.
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APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
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2016
·Vol. 180
·期 6
·1196-1212
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IF 1.606
Wang Yilong,Zhang Yun,Hu Yunfeng
One novel microbial esterase PHE21 was cloned from the genome of Pseudomonas oryzihabitans HUP022 identified from the deep sea of the Western Pacific. PHE21 was heterologously expressed and functionally characterized to be a robust esterase which behaved high resistance to various metal ions, organic solvents, surfactants, and NaCl. Despite the fact that the two enantiomers of ethyl 3-hydroxybutyrate were hard to be enzymatically resolved before, we successfully resolved racemic ethyl 3-hydroxybutyrate through direct hydrolysis reactions and generated chiral ethyl ( S )-3-hydroxybutyrate using esterase PHE21. After process optimization, the enantiomeric excess, the conversion rate, and the yield of desired product ethyl ( S )-3-hydroxybutyrate could reach 99, 65, and 87 %, respectively. PHE21 is a novel marine microbial esterase with great potential in asymmetric synthesis as well as in other industries.
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高影响因子
ELECTROCHIMICA ACTA
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2017
·
IF 4.798
Panpan Sun,Taian Huang,Ziyu Chen,Liangyu Tian,Huihui Huang,Niu Huang,Sha Zhou,Min Long,Yihua Sun,Xiaohua Sun
The design and facile fabrication of highly efficient, cost-effective and earth abundant counter electrode material on an electrode surface is highly desirable for the application of dye-sensitized solar cells (DSSCs). Herein, using a N,N-dimethylformamide based solution process, transition metal chalcogenide Ni x S y films have been obtained by spin-coating a NiCl 2 -thiourea (Ni-Tu) solution combining mild thermal treatment. XRD, SEM and TEM characterizations reveal that the current procedure allows for phase composition (Ni 3 S 2 , NiS and NiS-NiS 2 ), crystallinity , morphology (film uniformity and compactness) control of the films through simple adjusting Ni/S ratio in the precursor solution. Electrochemical analysis indicates that the FTO supported Ni 3 S 2 and NiS films exhibit excellent electrocatalytic activity toward the reduction of triiodide, resulting in higher photo-electric conversion efficiencies of 6.86% and 6.95% when used as counter electrode in DSSCs, versus 6.66% for Pt. In particular, even without the support of conductive FTO layer, Hall effect measurements and electrocatalytic analysis reveal that pristine Ni x S y films exhibit good electrical conductivity and electrocatalytic activity, yielding a highest photo-electric conversion efficiency of 4.41% when used as counter electrode in DSSCs. Our study thus provides a facile procedure which allows for composition, morphology optimization and high performance for low-cost, large-scale DSSC application.
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Materials Science & Engineering C-Materials for Biological Applications
·
2017
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IF 4.164
Suli Hu,Wenhong Hu,Zhenguang Li,Lixia Ren,Yunhui Zhao,Xiaoyan Yuan
Biomedical applications of the synthetic polymers with amino acid side moieties have been studied in light of their biocompatibility. In this work, poly(amino acid-hydroxyethyl methacrylate)s with lysine (Lys)/leucine side moieties were synthesized via reversible addition-fragmentation chain transfer polymerization, and were verified with intrinsic chirality. For biomedical uses, their antibacterial abilities as well as hemolysis and cytotoxicity were investigated. The results indicated that there were similar inhibitions for d - and l -enantiomeric polymers against Staphylococcus aureus when the polymer concentrations were lower than ~ 300 μg/mL, while the polymer containing d -Lys moiety was more effective against Escherichia coli . The d -enantiomers at concentrations < 500 μg/mL showed relatively lower hemolysis, and all the polymers showed good in vitro cell viability with concentrations lower than 200 μg/mL. It was indicated that the antibacterial amino acid-related synthetic polymers could be potentially applied for biomedical applications.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
·
IF 3.012
Yinxiu Zuo,Jingkun Xu,Fengxing Jiang,Xuemin Duan,Limin Lu,Guo Ye,Changcun Li,Yongfang Yu
Gold nanoparticles (AuNPs) dotted S-doped carbon (AuNPs/S-C) nanoflakes were synthesized via a facial and simple approach. Typical synthesis route involves the formation of gold nanoparticles/poly(3,4-ethylenedioxythiophene) (AuNPs/PEDOT) and a subsequent calcination process. Many techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) were used to characterize their morphology, structures and compositions . Results indicated that AuNPs with an average size of 5 nm were uniformly dotted on/into the S-C nanoflakes. The AuNPs/S-C/nafion was utilized as a new electrode material for simultaneously electrochemical determination of Cu (II) and Hg (II) using differential pulse anodic stripping voltammetry (DPASV) technique. Benefiting from the efficient metal-complexing ability and electrocatalytic activity of S-C and the good conductivity of AuNPs, the modified electrode exhibited enhanced electrochemical performance compared with bare glassy carbon electrode. Under optimal conditions, the peak currents displayed linear response to the concentrations of Cu (II) and Hg (II) ranges from 0.64 to 63.55 μg/L and 4.01 to 300.89 μg/L, with detection limits of 0.19 μg/L and 1.40 μg/L (S/N = 3), respectively. The modified electrode was also applied for the determination of Cu (II) and Hg (II) in lake water samples with good results.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 3
·951-959
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IF 4.58
Zhang Yuhuan,Wang Yanru,Zhu Wenxin,Wang Jing,Yue Xiaoyue,Liu Wei,Zhang Daohong,Wang Jianlong
The capability of multi-level logic operations in biological diagnosis is far from being fully realized. In particular, the simplification of logic judgments to realize rapid, on-site complex diagnoses is still a key issue in bioelectronics. The authors here describe the construction of a colorimetric multilevel DNA circuit that incorporates two IMPLY gates and a sample extraction technology (SET) with anti-BPA aptamer as a co-recognizing element and the color of gold nanoparticles as the output signal. The circuit can perform multi-bioanalysis of the plasticizers and hormone mimetics bisphenol A (BPA) and bisphenol S (BPS). The assay is based on the finding that the aptamer against BPA can recognize both BPA and BPS. This DNA logic detection system is simple, fast, sensitive and selective because of the utilization of a co-recognition element which decreased input numbers. This, in turn, cascades multiplex Boolean logic gates and simplifies the diagnostic challenge. Both BPA and BPS can be determined by photometry at 620 nm, the limit of detection being 1.5 ng⋅mL −1 for BPA and 1.3 ng⋅mL −1 for BPS. Application to (spiked) water samples shows good analytical performance in terms of recovery (95.4 to 106.8%), linear range (4.4 to 66 ng⋅mL −1 for BPA, 2.5 to 75 ng⋅mL −1 for BPS) and correlation coefficients (>0.98). In our perception, the method represents a simple route for the fabrication of colorimetric multi-level DNA circuits. It may shorten the gap between bioelectronic logic circuits and high throughput real sample analysis.
Illustration of sample extraction treatments (SET) of bisphenol A (BPA) and bisphenol S (BPS) and the three-input IMPLY1-IMPLY2 logic operation with BPA, BPS and anti-BPA aptamer as inputs.
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ACS Applied Materials & Interfaces
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2016
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IF 7.145
Bao Men,Yanzhi Sun,Jia Liu,Yang Tang,Yongmei Chen,Pingyu Wan,Junqing Pan
Although N-doped graphene-based electrocatalysts have shown good performance for oxygen reduction reaction (ORR), they still suffer from the single-type active site in the as-prepared catalyst, limited accessible active surface area because of easy aggregation of graphene, and harsh condition for preparation process of graphene. Therefore, further developing a novel type of graphene-based electrocatalyst by a facile and environmentally benign method is highly anticipated. Herein, we first fabricate a sandwich-like graphene/carbon hybrid using graphene oxide (GO) and nontoxic starch. Then the graphene/carbon hybrid undergoes postprocessing with iron(III) chloride (FeCl3) and potassium sulfocyanide (KSCN) to acquire N-doped graphene/carbon nanosheets decorated by Fe and S. The resultant displays the features of interpenetrated three-dimensional hierarchical architecture composed of abundant sandwich-like graphene/carbon nanosheets and low graphene content in as-prepared sample. Remarkably, the obtained catalyst possesses favorable kinetic activity due to the unique structure and synergistic effect of N, S, and Fe on ORR, showing high onset potential, low Tafel slope, and nearly four-electron pathway. Meanwhile, the catalyst exhibits strong methanol tolerance and excellent long-term durability. In view of the multiple active sites, unique hierarchical structure, low graphene content, and outstanding electrochemical activity of the as-prepared sample, this work could broaden the thinking to develop more highly efficient graphene/carbon electrocatalysts for ORR in fuel cells.
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JOURNAL OF CHROMATOGRAPHY A
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2016
·
IF 3.926
Sheng Tang,Jian-De Liu,Qin Bin,Ke-Qin Fu,Xiao-Chen Wang,Ying-Bin Luo,Shao-Hua Huang,Zheng-Wu Bai
In order to comprehensively understand the influence of coordination of the substituent at 2-position with those at 3- and 6-positions on the properties of chitosan derivatives, a series of chitosan 3,6-bis(arylcarbamate)-2-(amide)s (CACAs) and the related chiral stationary phases (CSPs) were prepared and reported in the present study. Specifically, chitosan was N -acylated with carboxylic acid anhydrides, and then further derivatized with various aryl isocyanates to afford CACAs, from which a class of coated-type CSPs were prepared. When the substituent introduced on the acyl group at 2-position and those on the phenyl group of the carbamates at 3- and 6-positions were fittingly combined, these prepared CACAs based CSPs would exhibit powerful chiral recognition ability, further resulting in a class of promising chiral separation materials with excellent enantioseparation performance. Meanwhile, these newly developed materials with suitable molecular weight also bear a high tolerability towards organic solvents, even including pure tetrahydrofuran, thus broadening their application in enantiomeric separation.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hongyi Huang,Shaoyuan Liu,Zeyu Kang,Yiwen Zhu,Chengbin Zhang,E Xiang,Zhang Lin,Weizhen Liu
Vancomycin fermentation residue (VFR) urgently needs proper treatment due to its complex and hazardous nature. Pyrolysis is a promising treatment method, while the product characteristics of VFR pyrolysis remain unclear. Therefore, the influence of different atmospheres and stepwise pyrolysis (including one-stage reaction in N 2 or CO 2 and two-stage reaction in N 2 ) on pyrolysis behavior, product characteristics, and N/S migration mechanism during VFR pyrolysis were investigated for the first time in this work. The results showed that VFR mainly decomposed at 180–600 °C, forming non-condensable gas, bio-oil, and biochar. The main released gases included CO 2 , H 2 O, NH 3 , HCN, SO 2 , and H 2 S, whereas the N-containing pollutant gas, notably NH 3 , should be focused due to its high emission (>10 %). Bio-oil was rich in N-containing compounds with a content exceeding 46 %, mainly consisting of Indolizne (9.2–11.5 %), 5H-1-Pyrindine (5.0–9.9 %), and Indole (8.4–9.0 %), and 9-Octadecenamide, (Z)- (1.8–10.1 %). Moreover, the effects of different conditions on the product characteristics were as follows: For the one-stage reaction, compared to N 2 , the CO 2 atmosphere promoted the formation of alcohols (intended product, increasing 2.2–14.6 %), whereas the two-stage reaction in N 2 inhibited alcohol production (decreasing 1.1–2.5 %). At CO 2 condition, the harmless temperature of VFR reduced from 600 °C (pyrolysis in N 2 ) to 400 °C. Both CO 2 (increasing 0.6–1.5 %) and the two-stage reaction in N 2 (increasing 0.4–1.0 %) retained more N in the solid. Kinetics showed that the pyrolysis process of VFR conformed to diffusion models and reaction order models (F2/D1/F3/D1 for N 2 and F2/D2/F3/D1 for CO 2 ). The VFR transformed to the chemicals and fuels mainly through the deamination, desulfurization, dehydration, decarboxylation, and dehydrogenation reactions. This work provides guidance for harmless disposal and resource utilization during VFR pyrolysis.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Haiping Liu,Zhiwei Liu,Li Guo,Xinna Zhao,Jing Liang,Xinyue Zhang,Qiancheng Gao,Xuefei Tian,Xiaofeng Jia,Yu Sun,Jianguo Zhou,Haitao Liu
Antibiotics pollution may pose a great risk to ecosystem and human health. In this work, an innovative dual-defect AgBiO 3 /DCN S-scheme heterojunction was constructed to overcome the sluggish charge separation and transfer issue and showed exceptional photodegradation performance towards norfloxacin (NFL) pollution under the visible light. The degradation efficiency of NFL reached 95.30 % within 120 min respectively, the rate constant was 3.64 times higher than that of defective g-C 3 N 4 (DCN). The systematically characterizations proved that the enhanced photocatalytic activity was benefited from optimized band structures, improved carrier separation efficiency, due to dual defects and S-scheme heterojunction in AgBiO 3 /DCN. the intermediate degradation products and degradation pathway of NFL were speculated by UPLC-HRMS, and the environmental toxicity degree of degradation products was analyzed according to the T.E.S.T software. The charge transfer pathway was confirmed as an S-scheme mechanism through a combination of band structure analysis, alongside electron paramagnetic resonance (EPR) experiments.The quenching experiments and ESR analyses indicated that h + and O 2 •− radicals played predominant roles. The efficient and stable photocatalytic NFL degradation efficiency and broad environmental adaptability proved potential practical application. This work may shed light on designing new dual-defect heterojunction with photocatalytic antibiotic removal capability in the innovative water treatment process.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hongli Yang,Rui Wang,Huilin Hou,Yang Li,Zhuodong Li,Haiyan Wang,Xiaoqiang Zhan,Dongdong Zhang,Zhao Liang,Yong Luo,Weiyou Yang
The integration of S-scheme heterojunctions and solid solutions presents a dual-driven strategy for efficient charge transport, thus facilitating superior spatial separation and mobility of photogenerated carriers for overall enhanced photocatalytic behaviors. In this work, the photocatalysts of CdS@N-NiCoO (CdS@NCO) were rationally designed, by combining the ultrafine CdS nanoparticles with N-doped NiCoO (NCO) porous microrods derived from a metal organic framework (MOF) precursor. It is verified that the incorporated N dopants and Co-induced impurities could optimize the electronic structure of solid solution, thereby enhancing the charge separation and mobility of photogenerated carriers. Moreover, according to the UPS and in-situ XPS analyses, the formed S-scheme heterojunction based on n -type CdS ensures the efficient electron-hole separation with improved redox potentials. The resultant photocatalysts achieve an outstanding hydrogen (H 2 ) evolution rate of 4632 μmol·g −1 ·h −1 , which is ∼ 26 times to that of pristine NCO, and outperforms those of most NiO- and Co 3 O 4 -based photocatalysts ever reported. Current work might provide some insights on exploring advanced photocatalyst for efficient and sustainable H 2 production, enabled by the synergistic effect between heterojunctions and solid solutions.
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