TALANTA
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2017
·
IF 4.162
Chang Xia,Xin Hai,Xu-Wei Chen,Jian-Hua Wang
A facile one-step solvent-free synthesis approach is proposed for the simultaneous fabrication of free and solidified N, S-doped graphene quantum dots (N, S-GQDs) by using citric acid as precursor and L -cysteine as dopant. Graphene nucleus is firstly formed via the intermolecular dehydration of citric acid. N and S are then incorporated into the graphene structure by attacking the margin of graphene nucleus. The cross-linking among the graphene nucleus via the intermolecular condensation leads to the generation of free N, S-GQDs, while the intermolecular amidation between L -cysteine molecules and graphene nucleuses contributes to the solid-state fluorescence graphene quantum dots (SSF-GQDs). The free N, S-GQDs exhibit favorable photoluminescence behaviors such as high fluorescent quantum yield of 74.5%, stable photoluminescence within a wide range of pH and high tolerance to external ionic strength of up to 1.0 mol L −1 NaCl , making it excellent fluorescence probe for the sensitive detection of Fe 3+ with a linear range of 0.01–3 μM and a detection limit of 3.3 nM. The solidification of GQDs prevents the aggregation of GQDs efficiently and offers the solidified N, S-GQDs yellow-green fluorescence, with a fluorescence quantum yield of 10.6%. This proposed protocol provides a novel avenue to fabricate diverse fluorescent graphene materials for different practical applications.
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高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Hongjuan Wang,Duo Qian,Xilin Xiao,Bo He,Shuqin Gao,Han Shi,Lifu Liao,Jian Deng
Highly selective determination of enantiomers by electrochemical sensors with simple recognition elements is of great interest in pharmaceutics, biochemistry and medical fields. The present work developed an innovative electrochemical sensor, which based on boron-embedded molecularly imprinted hybrid film (B-MIHF) modified carbon paste electrode (CPE), for enantioselective determination of S -ornidazole ( S -ONZ). A boron-embedded conductive copolymer was firstly electro polymerized on carbon paste electrode (CPE), and then molecularly imprinted polysiloxanes (MIP) were hydrolyzed and condensed over the conductive copolymer layer via a sol-gel process. The as-prepared B-MIHF, comprised the advantages of boron-embedded conductive copolymer and molecularly imprinted polysiloxanes, could not only implement direct signal transformation between imprinted cavities and sensing elements, but show amazing selectivity to template S -ornidazole. Above all, the introduction of coordinate interaction formed between trisubstituted boron atoms embedded in B-MIHF matrix and nitrogen atoms of template endow the sensor with intensive enantioselectivity. Under optimum experiments conditions, the reduction peak currents of S -ONZ by differential pulse voltammetry were linear to S -ONZ concentrations in the range from 6.0 × 10 −8 to 1.0 × 10 −6 mol L −1 and 1.0 × 10 −6 to 3.5 × 10 −4 mol L −1 with a detection limit of 1.1 × 10 −8 mol L −1 . The B-MIHF-based sensor has been successfully applied for the determination of S -ONZ in pharmaceutical and biological samples with good precision (RSD 2.25–4.11%) and acceptable recoveries (96.00–108.00%).
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JOURNAL OF MEMBRANE SCIENCE
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2017
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IF 6.035
Di Lu,Dan Li,Lele Wen,Lixin Xue
Anion exchange membranes from cyclohexylidene moiety containing poly(arylene ether sulfone)s with N-methylimidazolium and 1,2-dimethylimidazolium pendant ionic groups were prepared. For comparison, bisphenol A moiety and biphenyl moiety containing AEMs with 1-methylimidazolium and 1, 2-dimethylimidazolium pendant ionic groups were also prepared. The chemical structure of the polymers and corresponding AEMs obtained were characterized with 1 H NMR and FT-IR spectroscopies. The surface morphology and hydrophilic-hydrophobic phase separation of the AEMs were studied by SEM and AFM . The thermal and mechanical properties , ion exchange capacity, water uptake, swelling ratio, hydroxide conductivity as well as long-term alkaline stability of the AEMs were also intensively investigated. It was confirmed that AEMs having pendant ionic groups of 1,2-dimethylimidazolium were much stable than those having 1-methylimidazolium pendant ionic groups. Results also showed that the existence of the non-planar hydrophobic cyclohexylidene moiety in the AEMs backbone could not only create steoric hindrance to facilitate dimensional and chemical stability, but also thwart the formation of large hydrophobic domains and provide additional free volume to facilitate water retention and ionic transportation. The hydroxide conductivity of cyclohexylidene moiety containing DIm-CHPAES AEM had a highest value of 90 mS cm −1 at 80 °C, and degraded only 12.4% after soaked in 1 M NaOH solution for 35 days at 60 °C, bearing a high potential for practical applications in alkaline anion exchange membranes fuel cells.
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POLYMER
·
2017
·
IF 3.684
Yunji Xie,Bei Liu,Zheng Chen,Xiaocui Han,Baijun Liu,Haibo Zhang,Jinhui Pang,Zhenhua Jiang
A series of poly(arylene ether ketone)s (PAEKs) with dense sulfonic-acid-functionalized pendants were successfully synthesized by the Ullmann C–N coupling of a polymer precursor containing pendant iodobenzene rings and 3,6-ditrityl-9H-carbazole, followed by sulfonation using chlorosulfonic acid. A tough transparent membrane, which exhibited suitable dimensional stability and high proton conductivity, was obtained by casting an N , N -dimethylacetamide polymer solution . DSPAEK-CZ-25 (IEC = 2.03 meq. g −1 , where IEC = ion-exchange capacity) exhibited the highest proton conductivity of 177 mS cm −1 at 100 °C; this value is significantly greater than that of Nafion 117. In terms of molecular design, the large difference in polarity between the fluorinated polymer backbone and the concentrated pendant sulfonic acid groups possibly induces good phase-separation morphology, which enhances conductivity and dimensional stability. The obtained membranes exhibited excellent thermal stabilities and good mechanical properties . Overall, the DSPAEK-CZ polymers exhibited outstanding comprehensive performance as potential materials for proton exchange membranes (PEMs).
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Polymer Chemistry
·
2017
·Vol. 8
·期 29
·4207-4219
·
IF 5.375
Feixiang Gong,Ruiqiang Wang,Xinbing Chen,Pei Chen,Zhongwei An,Suobo Zhang
To produce a highly anion-conductive and durable polymer electrolyte membrane for alkaline fuel cell applications, a series of novel cardo poly(arylene ether sulfone)s with different cycloaminium side chains were prepared, and the relationships between cycloaminium groups and the properties of the corresponding membranes were discussed in detail. It was found that the pendent alicyclic alkyl chain structure and higher alkalinity of alicyclic amine groups were responsible for the development of highly conductive ionic domains, as confirmed by TEM. The membranes with cycloaminium groups showed higher hydroxide conductivities than those bearing quaternary ammonium groups with similar IEC values, and their water uptakes and hydroxide conductivities were in accordance with the alkalinity of the alicyclic amine groups for each series. The highest conductivity (30 ms cm−1 at 25 °C and 59 ms cm−1 at 80 °C) was observed for the polymer with pyrrolidinium groups. The chemical stability of the membranes was evaluated under severe conditions (4 M NaOH at 80 °C), and degradation was investigated by measuring ion conductivity and 1H NMR changes during aging. By comparison with the 1H NMR data before and after aging, it was found that the degradation of poly(arylene ether sulfone)s with pendent cycloaminium side chains was mainly attributed to the SN2 reactions, and the methylene carbons which linked with the N atom were more sensitive than methyl carbons during aging.
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JOURNAL OF NON-CRYSTALLINE SOLIDS
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2017
·
IF 2.124
Quan Guo,Yantao Xu,Haitao Guo,Xusheng Xiao,Changgui Lin,Xiaoxia Cui,Pengfei Wang,Fei Gao,Min Lu,Bo Peng
A serial (100 − x)Ge 25 Sb 10 S 65 -xI (x = 0, 5, 10, 15, 20, 25 and 30 wt%) chalcohalide glasses and ones doped with 0.1 wt% Dy 3 + rare-earth ions were synthesized and their structural, thermal and optical properties were systematically studied. It indicates that addition of I 2 into Ge 25 Sb 10 S 65 glass significantly decreases the connectivity of glass network and average bond energy, and modifies the associated properties. The glass transition temperature and refractive index decrease monotonically, and the density increases almost linearly with the increasing of iodine content in glass. The thermal stability is improved, which has a maximum of ΔT max = 174 °C. While the optical bandgap has a peak value at x = 10 wt%. The absorption spectra and mid-infrared fluorescence spectra of Dy 3 + rare-earth ions doped glasses were investigated together with the Judd-Ofelt analysis. GeS 2 nano-crystals were found in the sample with x ≥ 15 wt%, which is supposed to induce enhancements of mid-infrared fluorescence at 2.95 and 4.32 μm.
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TALANTA
·
2016
·
IF 4.035
Bintong Huang,Lili Xiao,Haifeng Dong,Xueji Zhang,Wei Gan,Shahid Mahboob,Khalid Abdullah Al-Ghanim,Qunhui Yuan,Yingchun Li
A novel electrochemical sensor has been facilely fabricated by applying composite elements consisting of nitrogen and sulfur co-doped activated graphene (N,S-AGR) and molecularly imprinted polymer (MIP). N,S-AGR was synthesized by one-pot pyrogenation of a mixture of thiourea , KOH and graphene oxide , which was introduced to improve electron transfer capability and surface area of the electrode, while the electro-polymerized MIP layer afforded simultaneous recognition and quantification of cyclophosphamide (CPA) by utilizing Fe(CN) 6 3−/4− as probe to indicate electrical signals. Under the optimal conditions, a calibration curve of current shift versus concentration of CPA was got in the range of 8×10 −12 –8×10 −7 mol L −1 , and the developed sensor gave a remarkably low detection limit (LOD) of 3.4×10 −12 mol L −1 (S/N=3). Moreover, the as-prepared sensor illustrated other good merits like stability and selectivity, and played a role in real-time therapeutic drug monitoring after CPA administration in rabbit.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2016
·
IF 2.653
Qianghua Ye,Fanyong Yan,Yunmei Luo,Yinyin Wang,Xuguang Zhou,Li Chen
Biomass is regarded as an excellent candidate for the preparation of heteroatom-doped carbon nanomaterials . We have developed a simple and facile one-pot synthesis of nitrogen and sulfur codoped fluorescent carbon dots from pigeon feathers, egg and manure via the pyrolysis carbonization method. The as-prepared four PCDs have high fluorescence quantum yield about 24.87% (PCDs-f), 17.48% (PCDs-w), 16.34% (PCDs-y), 33.50% (PCDs-m), respectively, which is higher than the other carbon dots preparing from biomass. We found that the preparation of PCDs-m with pigeon manure has no favourable selectively with heavy metal ions . However, other PCDs exhibit highly sensitive and selective detection behavior of Hg 2 + /Fe 3 + ions with a low detection limit of 10.3 and 60.9 nM. They were applied to imaging of human umbilical vein endothelial cells, showing low cytotoxicity and good biocompatibility.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Zhiyuan Chen,Wenhui Chen,Peipei Han,Jizhou Yang,Zhi Wan,Peng Hu,Feng Teng,Haibo Fan
Compared with traditional photocatalytic materials, hollow nanofibers can show greatly improved photocatalytic efficiency due to their large specific surface area and more surface-active sites. In this work, one-dimensional (1D) hollow ZnGa2O4/ZnO nanofibers were successfully prepared by coaxial electrospinning technology first, and then the effect of Ag photodeposition on the photocatalytic degradation of tetracycline hydrochloride (TC-HCl) was studied. It is found that Ag can improve the light absorption of the Ag@ZnGa2O4/ZnO architecture, and meanwhile an S-scheme heterojunction forms between ZnGa2O4 and ZnO, which can synergistically increase the amounts and reduce the recombination of photogenerated carriers, thereby improving the photocatalytic degradation performance. By optimizing the ratio of different mass fractions of Ag, the maximum degradation rate can reach 0.0708 min−1, which is 22 times that of the TC-HCl self-degradation rate. This work not only provides a new idea for the preparation of a 1D hollow nanofiber heterojunction photocatalyst, but has also prepared an effective catalyst for photocatalytic degradation of TC-HCl.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Maoquan Wu,Yang Yang,Shouchun Ma,Xu Guo,Haochen Yu,Yaodan Cao,Jie Wu,Li Liu,Tongjie Yao
Designing and developing efficient photocatalysts for H 2 evolution and simultaneous oxidation of benzyl alcohol (BA) in aqueous environments provides a cutting-edge strategy for green synthesis. Nevertheless, the photocatalysts suffer from the low photoconversion efficiency because of the sluggish dynamics and repaid recombination of photogenerated charge carriers, which hindering their widespread applications. To address the limitation, a multifunctionnal sulfur vacancies (SVs) modified ZIS-Vs@NIS S-scheme heterojunction with a strong interfacial electric field effect was synthesized to use photocatalytic H 2 production and BA oxidation, simultaneously. Experimental analysis supports that the synergistic effect of SVs and S-scheme heterojunction engineering result in a suitable energy band structure alignment and larger Fermi level potential difference. Those factors can realize effective charge transfer and separation, and enhance the photocatalytic performance. As anticipated, ZIS-Vs@NIS exhibited a superior photocatalytic performance with H 2 and benzaldehyde (BAD) yields up to 168.1 and 146.1 μmol under the simulated solar-light irradiation for 1.0 h, respectively, which are approximately 13.3 and 11.8 times higher than pristine ZIS. Moreover, the photocatalytic H 2 evolution coupled with BA oxidative dehydrogenation mechanism via S-scheme heterojunction over ZIS-Vs@NIS is also demonstrated in detail.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yongqi Mu,Ran Tao,Yanxin Wang,Yongming Lv,Jiale Li,Tianyang Piao,Xiaoxing Fan
Photocatalytic nitrogen fixation presents a promising method for low-energy and environmentally friendly ammonia production. However, efficiency remains relatively low due to insufficient proton and electron supply during the photocatalytic process. In this study, ZnWO 4 /g-C 3 N 4 S-scheme heterojunction nanofibers are prepared by electrospinning combined with vapor deposition method. The ZnWO 4 /g-C 3 N 4 nanofibers are rich in oxygen vacancies and heterovalent W ions, which work synergistically to protonate water molecules, thereby providing the necessary protons for nitrogen fixation. The matched energy band structures of ZnWO 4 and g-C 3 N 4 form a built-in electric field at contact interface, which effectively separate photogenerated carriers. The one-dimensional nanofiber structure induces the carrier transport along the fiber axis and shortens the diffuse distance for carriers to active sites. As expected, the maximum photocatalytic nitrogen fixation performance of ZnWO 4 /g-C 3 N 4 reaches 144.5 μmol·L -1 ·min −1 ·g −1 , which is 19.5 times higher than that of single-component g-C 3 N 4 . After five cycles of experiments, the performance is 90.8 % of the original, showing significant stability. ZnWO 4 /g-C 3 N 4 also exhibits excellent photocatalytic nitrogen fixation activity and stability in natural river water, with practical application potential. This innovative achievement is expected to be applied in future agricultural production, promoting agriculture towards a greener and lower-carbon direction.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Jin Yang,Jun Shi,Yupeng Wu,Huimin Liu,Zhiqiang Liu,Qinwen You,Xinxin Li,Linchuan Cong,Debo Liu,Fangbing Liu,Yue Jiang,Nan Lin,Wenli Zhang,Haibo Lin
Efficient, low-cost cathode catalysts featuring highly dispersed, active sites are pivotal for advancing metal–air batteries. In this study, a bifunctional catalyst was developed using rice husk-based porous carbon (RHPC) with a hierarchical porous structure, comprising a multilayer heterostructure integrating nanoscale CoFe@(Co0.5Fe0.5)S wrapped with nitrogen-doped carbon nanotubes (NCNTs). XRD and TEM images reveal the formation of a CoFe alloy on the RHPC surface and pores, catalyzing the growth of uniform-diameter NCNTs. XPS analysis demonstrates an electron-donating effect on the surface pyridinic-N structure upon introducing the sulfide intermediate layer. Theoretical simulations substantiate these discoveries, emphasizing diminished adsorption of *OH and *OOH, substantially reducing overpotentials for both the ORR by 21 mV and OER by 46 mV compared to CoFe@NCNT/RHPC lacking the sulfur element. This results in CoFe@(Co0.5Fe0.5)S@NCNT/RHPC emerging as an exceptionally effective bifunctional catalyst (ΔE = 0.614 V). Integration into a rechargeable zinc–air battery showcases a peak power density of 136.0 mW cm−2. The unique morphology design and electronic structure optimization significantly improve the catalytic performance.
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