Analytical Methods
·
2023
·Vol. 15
·期 7
·884-895
·
IF 3.1
Xin Wang,Xiaoqi Sun,Yueying Jin,Shengyu Cheng,Yu Han,Minghui Zhang,Lingli Zhang,Xi-Ling Li,Chun-Yan Xu,Jun Zhe Min
This study reports a novel fluorescent chiral derivatization reagent, 4-(N,N-dmethylaminosulfonyl)-2,1,3-benzoxadiazole-(2-succinimidoxy)-trans-2-methyl-L-proline (DBD-S-M-Pro), with a benzoxadiazole structure containing an N-hydroxysuccinimide activation group. DBD-S-M-Pro targets chiral amino-functional compounds under alkaline conditions without a condensation agent. Gradient elution was performed on a BEH C18 (100 × 2.1 mm, 1.7 μm) column with a mobile phase of 0.05% formic acid (FA) in 10 mM ammonium acetate (CH3COONH4) and 0.1% FA in acetonitrile or methanol. The efficiency of the chiral resolution was evaluated under excitation and emission wavelengths of 450 nm and 560 nm, respectively. The 19 chiral amino acids were separated in the range of 1.45–14.84. The resolutions of almost all DL-amino acids exceeded 1.5; the exceptions were serine (Ser) and lysine (Lys), with resolutions of 1.45 and 1.46, respectively. In addition, a new approach was devised for the simultaneous analysis of four chiral amino acids (DL-Glu, DL-Ala, DL-Val, and DL-Phe) in human hair. These amino acids were analyzed in the range of 12.5–400 pmol, with R2 ≥ 0.9990, limits of detection (S/N = 3) of 4–10 pmol, and intraday and interday precisions of 0.57–6.23%. The average spikes in the hair recoveries were 89.76–111.54%, and the matrix effects were 92.47–102.40%. Next, the contents of free chiral amino acids in the hair samples of 10 healthy volunteers (five males and five females) were analyzed with this method, and the differences were compared. The developed DBD-S-M-Pro provides a novel strategy for the sensitive determination of free chiral amino acids in living organisms.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Lidan Deng,Jiawei Wang,Zaikun Wu,Chenhong Liu,Ling Qing,Xiaowei Liu,Jie Xu,Zijian Zhou,Minghou Xu
Supported Pt-based bimetallic catalysts are representative types of dehydrogenation catalysts used for alkanes to olefins conversion. The platinum in these catalysts exhibits unique structural features accompanied with changes in electronic states due to the addition of the second metal. To investigate the impact of each effect on the activity for propane dehydrogenation , a series of Pt-M/SiO 2 (M= Fe, Cu, Ga, In and Sn) catalysts were prepared and used for propane dehydrogenation. Utilizing various characterization techniques, the geometric and electronic properties of these catalysts were studied. The relationships between the specific activity of bimetallic platinum catalysts in propane dehydrogenation and atomic sizes of alloys (i) and the total density of unoccupied d bands in platinum (ii) were considered. Via alloy formation, it was found that dilution of the active metal Pt occurred in these SiO 2 supported bimetallic catalysts, and the lattice parameter of Pt-M alloys decreased on Pt-Fe, Pt-Cu and Pt-Ga alloys, but increased on Pt-In and Pt-Sn alloys when compared with that of Pt foil. Catalytic activity was evidently shown to not be a function of the lattice parameters of Pt-M alloys, but appears closely related with the d -holes of Pt in Pt-M bimetallic catalysts. More d holes show favorably high activity. Among the studied Pt-M/SiO 2 (M= Fe, Cu, Ga, In and Sn) catalysts, the prominent and primary role of the electronic effect was demonstrated.
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NANOTECHNOLOGY
·
2021
·Vol. 32
·期 39
·395703
·
IF 3.874
Zhihua Li,Xin Ding,Bing Yu,Yu Min,Bin He,Youqing Shen,Hailin Cong
Near-infrared (NIR) emission materials can be widely applied in various fields, such as food detection, imaging, treatment, electronic products. With the trend of miniaturization of equipment, smaller materials are needed. In this work, we successfully synthesized a series of M2Ga2GeO7:N3+ (M = Ca, Ba, Sr; N = Cr, Nd, Er) samples and then focused on the study of Nd3+ doped Sr2Ga2GeO7 (SGGO). A series of SGGO:xNd3+ sub-micron phosphors were prepared via a microwave-assisted sol–gel process combined with subsequent calcination at 750 ℃, and the structural information and luminescent properties were systematically studied. SGGO is a representative tetragonal crystal and belonging to the space group of P4¯21m (113). The Nd3+ ions occupy eight-coordinated Sr2+ sites in the crystal lattice. From SEM analysis, the average particle size distribution is 219.7 ± 41.4 nm. The sub-micron phosphors have rich excitation spectra ranging from 350 nm to 850 nm and can produce multiband NIR emissions of 1331, 1056, and 905 nm when excited by ultraviolet and NIR light. The maximum emission intensity was obtained by optimizing the doping ratio of Nd3+ ions. A commercial chip was then utilized to fabricate light-emitting diodes (LEDs) to verify its application potential in NIR-II mini-LEDs. Compared with blue light LEDs, the as-prepared LEDs had good imaging penetration depth and could be clearly observed under 10 mm of chicken breast coverage. The maximum imaging penetration depth can be 33 mm.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Junhua Li,Lingzhi He,Jianbo Jiang,Zhifeng Xu,Mengqin Liu,Xing Liu,Haixia Tong,Zeng Liu,Dong Qian
In this work, three kinds of bimetallic Prussian blue analogues (PBAs), i.e. K x Ni [Fe(CN) 6 ]·nH 2 O (NiFe-PBA), K x Co [Fe(CN) 6 ]·nH 2 O (CoFe-PBA), and K x Mn [Fe(CN) 6 ]·nH 2 O (MnFe-PBA), were synthesized by a simple precipitation method under identical conditions. Their chemical compositions , structures, morphologies, valences of transition metals, and electrochemical sensing performances for 2-nitrophenol (2-NP) are examined in details. It is found that all the prepared PBAs hold face-centered-cubic structures with near perfect cube morphologies for NiFe-PBA and CoFe-PBA and truncated cube morphology for MnFe-PBA. For the electrochemical detection of 2-NP, a wide detection range of 1.0–700.0 μM was obtained at all PBAs modified electrodes together with the sensitivities of 443.3, 368.0, and 339.0 μA cm −2 mM −1 and detection limits of 0.28, 0.46, and 0.59 μM achieved at NiFe-PBA, CoFe-PBA, and MnFe-PBA modified electrodes, respectively. The superiority in electrochemical sensing performance of NiFe-PBA to CoFe-PBA and MnFe-PBA may stem from its higher conductivity, lager electroactive surface area, and better intrinsic catalytic property of the transition metal in its framework. Furthermore, the constructed NiFe-PBA-based sensor displays good repeatability, long-term stability, and high selectivity together with desirable recoveries (97.8–103.9%) for the assay of 2-NP in water samples. The present work is the first report on the PBAs-based electrochemical sensors for 2-NP detection, which may promise a future of PBAs or PBAs-based materials for sensing applications.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2023
·Vol. 46
·期 12
·1801-1815
·
IF 3.8
Zhou Zhaoxin,Liu Xinmin,Chen Ranran,Hu Xiude,Guo Qingjie
Anaerobic fluidized bed microbial fuel cell (AFB-MFC) is a technology that combines fluidized bed reactor and microbial fuel cell to treat organic wastewater and generate electricity. The performance and the mechanism of treating m- cresol wastewater in AFB-MFC using carbon brush as biofilm anode were studied. After 48 h of operation, the m- cresol removal efficiency of AFB-MFC, MAR-AFB (fluidized bed bioreactor with acclimated anaerobic sludge), MAR-FB (ordinary fluidized bed reactor with only macroporous adsorptive resin) and AST (traditional anaerobic sludge treatment) were 95.29 ± 0.67%, 85.78 ± 1.81%, 71.24 ± 1.86% and 70.41 ± 0.32% respectively. The maximum output voltage and the maximum power density of AFB-MFC using carbon brush as biofilm anode were 679.7 mV and 166.6 mW/m 2 respectively. The results of high-throughput sequencing analysis indicated the relative abundance of dominant electroactive bacteria, such as Trichococcus , Geobacter , and Pseudomonas , on the anode carbon brushes was higher than that of AST, and also identified such superior m- cresol-degrading bacteria as Bdellovibrio , Thermomonas , Hydrogenophaga , etc. Based on the determination of m- cresol metabolites detected by Gas Chromatography–Mass Spectrometry (GC–MS), the possible biodegradation pathway of m- cresol under anaerobic and aerobic conditions in AFB-MFC was speculated. The results showed that m- cresol was decomposed into formic acid–acetic anhydride and 3-methylpropionic acid under the action of electrochemistry, which is a simple degradation pathway without peripheral metabolism in AFB-MFC.
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Surfaces and Interfaces
·
2023
·
IF 6.2
A.V. Ravindra,M. Chandrika,Andem Sandeep
This work presents the effectual degradation of MB and MO dyes in an aqueous solution under UV light irradiation on nano ZnFe 2 O 4 , NiFe 2 O 4 , and Fe 3 O 4 without using any supplementary oxidants has been reported. Nano ZnFe 2 O 4 , NiFe 2 O 4 , and Fe 3 O 4 are successfully prepared via a co-precipitation technique utilizing biodegradable starch as a surfactant . XRD patterns reveal a pure spinel phase for all the samples. FTIR spectra confirm the successful embedding of the starch surfactant. SEM micrographs exhibit tiny spherical particles of size 5–8 and 4–6 nm for ZnFe 2 O 4 and NiFe 2 O 4 but spherical particles of 8–10 nm and flake-like particles of ∼14 nm thick for Fe 3 O 4 . N 2 sorption studies show type-IV isotherms typical of mesoporous structures. The direct bandgap of these ferrite nanoparticles is 2.03–2.15 eV, related to the metal D-d onsite transfers, which are permitted by spin but prohibited by parity. MB decolorization of 99% is achieved in less than 2 h for all the samples; in contrast, MO decolorization takes relatively longer irradiation. The decolorization kinetics suggests that the pseudo-second-order model is more appropriate to explain the decolorization process of MB and MO by the catalysts. The order of photocatalytic activity evaluated from rate constant (k 1 ) per SSA values is Fe 3 O 4 < ZnFe 2 O 4 < NiFe 2 O 4 for both MB and MO decolorization. NiFe 2 O 4 photocatalyst shows the best effect on the decolorization of both dyes due to its low bandgap and high surface area. All the ferrite catalysts demonstrate high stability with no substantial deterioration of photocatalytic activity even after three cycles. The results of this study endorse that the nano ferrites prepared in this work are potential candidates for the photocatalytic degradation of aqueous solutions of MB and MO.
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Nanoscale
·
2023
·Vol. 15
·期 15
·7032-7043
·
IF 6.7
Bowei Pan,Shuang Shan,Junpeng Wang,Quan Tang,Longfei Guo,Tao Jin,Qiao Wang,Zhen Li,Muhammad Usman,Fuyi Chen
The study provides a proof of concept for the first time that unique palladium–gold (PdAu) and palladium–silver (PdAg) nanodendrites are bifunctional catalytic active sites for formate oxidation reactions (FORs) and formate dehydrogenation reactions (FDRs). The unique nanodendritic structure was developed via a simple galvanic displacement reaction for the direct growth of PdAu and PdAg nanodendrites on a nickel foam (PdAu/NiNF and PdAg/NiNF). These PdAu/NiNF and PdAg/NiNF electrodes exhibited 2.32 and 1.59 times higher specific activity than that of the commercial Pd/C electrode and promising stability toward FORs. Moreover, the PdAu/NiNF and PdAg/NiNF nanodendrites were also highly active and selective catalysts for hydrogen generation from a formate solution with turnover frequency (TOF) values of 311 h−1 and 287 h−1 respectively. Impressively, a passive air-breathing formate fuel cell with PdAu/NiNF used as an anode can yield an open-circuit voltage of 1.12 V and a peak power density of 21.7 mW cm−2, which outperforms most others reported in the literature. PdAu and PdAg nanodendritic catalysts supported on a nickel foam demonstrate an open structure and uniform catalyst distribution and offer a promising nanoalloy for air-breathing formate fuel cells and on-site chemical hydrogen production systems.
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JOURNAL OF CELLULAR PHYSIOLOGY
·
2019
·Vol. 235
·期 3
·2911-2924
·
IF 4.522
Qiuyue Ding,Wenda Zhang,Cheng Cheng,Fengbo Mo,Lei Chen,Guangfu Peng,Xianyi Cai,Jinglong Wang,Shuhua Yang,Xianzhe Liu
Pyroptosis is a form of programmed cell death (PCD) that plays a vital role in immunity and diseases. Although it was recently reported that chemotherapy drugs can induce pyroptosis through caspase-3-dependent cleavage of gasdermin E (GSDME), the role of pyroptosis in osteosarcoma (OS) with dioscin is less understood. In this study, we explored the effects of dioscin on OS in vitro and in vivo and further elucidated the underlying molecular mechanisms and found that dioscin-triggered pyroptosis in GSDME-dependent cell death and that GSDME-N was generated by caspase-3. Furthermore, dioscin inhibited cancer cell growth by inducing G2/M arrest and apoptosis through the JNK/p38 pathway. In vivo, dioscin significantly inhibited OS proliferation. Taken together, our results demonstrate that dioscin can induce apoptosis through the JNK/p38 pathway and GSDME-dependent pyroptosis in OS, identifying it as a potential therapeutic drug for treatment of this disease. HIGHLIGHTS Dioscin triggers pyroptosis in osteosarcoma. Gasdermin E is a mediator of dioscin-induced osteosarcoma (OS) cell death. Dioscin induces apoptosis and G2/M arrest. Dioscin inhibits OS proliferation in vitro and in vivo.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Huijuan Zhao,Nanping Deng,Jing Yan,Weimin Kang,Jingge Ju,Liyuan Wang,Zongjie Li,Bowen Cheng
In this study, a hybrid Poly-m-phenyleneisophthalamide/Octaphenyl-Polyhedral oligomeric silsesquioxane (PMIA/Octaphenyl-POSS) membrane (HPPS) was fabricated by electrospinning technique and its application performance as lithium-ion battery separators was discussed. The organic-inorganic feature of Octaphenyl-POSS (OPS) endowed admirable compatibility of membrane matrix for the HPPS membranes. The nanofiber membranes with OPS nanoparticles were provided with commendable thermal stability, robust mechanical strength (21.79 MPa), high porosity and electrolyte uptake, which laid a good foundation for improving the safety and cycle performance of the cells with the separator. The lithium-ion battery with the HPPS separator displayed a high ionic conductivity of 1.93 × 10 −3 S·cm −1 and a stable electrochemical window of 4.98 V. More significantly, the HPPS nanofiber membrane based Li/LiCoO 2 cell exhibited excellent cycling stability with high first discharge capacity up to 157.9 mAh·g −1 and superior capacity retention of 89.04% after 100 cycles. Therefore, the HPPS separator has extraordinary potential to be used in high-performance lithium-ion battery.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Xiaojun He,Ze Tan,Qinbo Wang,Yinchuan Pei
Mononitro-substituted products derived from the nitration of m-toluic acid are 3-methyl-4-nitrobenzoic acid, 3-methyl-2-nitrobenzoic acid, and 5-methyl-2-nitrobenzoic acid, which are all crucial intermediates of pesticides and medicines. The solubilities of 3-methyl-4-nitrobenzoic acid, 3-methyl-2-nitrobenzoic acid, and 5-methyl-2-nitrobenzoic acid in water, methanol, ethanol, n-propanol, formic acid, acetic acid, and propanoic acid were measured at different temperatures (297.65–351.75 K) and under atmospheric pressure. As expected, the same solute has different solubilities in different solvents, and the dissolved amounts of these three solutes are also diverse in the same solvent. Subsequently the experimental solubility data of three mononitro-substituted products of m-toluic acid nitration in several solvents were correlated with the modified Apelblat equation and the NRTL activity coefficient model, and the calculated values are in excellent agreement with known experimental data in the temperature range studied.
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Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 45
·23641-23650
·
IF 8.867
Zhong-Jie Jiang,Si Cheng,Haibo Rong,Zhongqing Jiang,Jianlin Huang
A general method has been developed for the synthesis of the spindle-like MFe2O4/C (M = Zn, Co, Ni, Mn). The synthetic procedure involves the preparation of mixed metal organic frameworks (i.e. Fe2M-MOFs) and their subsequent calcination. The obtained MFe2O4/C spindles show an intriguing structure, which consists of carbon coated secondary MFe2O4 nanoparticles with an interconnected carbon network. This makes them highly promising as the active materials for various applications with enhanced performance. For example, when used as the anode for lithium ion batteries (LIBs), the MFe2O4/C spindles exhibit higher reversible capacities and higher cycling stability in comparison to the MFe2O4 materials reported previously. Most interestingly, these MFe2O4/C spindles exhibit good morphology preservation during cycling. This shows that the volumetric expansion of MFe2O4 upon lithiation leads to the leaching of some active materials to the surface of the MFe2O4/C spindles along the percolation channels. This alleviates the volumetric expansion energy and prevents the structural destruction of MFe2O4/C spindles. The leached active materials do not detach from the MFe2O4/C spindles and participate in the lithiation/delithiation reactions throughout the whole cycling process, giving the MFe2O4/C spindles with high specific capacity and good durability. The approach reported here is highly versatile and might be applicable to the synthesis of other MFe2O4/C spindles for various applications.
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Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 47
·18354-18365
·
IF 8.262
Lin Han,Pengfei Wang,Hui Liu,Qiangqiang Tan,Jun Yang
Tailoring the internal structure and chemical composition of nanomaterials is an effective way to enhance their performance for a given application. Herein, we report a general wet-chemistry approach to produce copper (Cu)-based binary hollow nanostructures with well defined architectures and investigate their catalytic properties in electrochemical reactions. This strategy relies on the galvanic replacement between Cu seeds and noble metal precursors including ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), and platinum (Pt) in oleylamine at an appropriate temperature, which is essential to balance the reduction kinetics of the noble metal precursors by oleylamine during their galvanic replacement with Cu seed particles. Typically, the bimetallic CuPt hollow nanostructures with polyhedral morphologies exhibit enhanced catalytic properties for the oxygen reduction reaction (ORR), while their spherical counterparts obtained at a relatively low temperature show high activity for the methanol oxidation reaction (MOR). In particular, we will also demonstrate a unique application of the CuRu hollow nanostructures in supercapacitors after converting them into binary metal oxides at elevated temperatures in air.
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