JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Zhihao Wang,Mengxiao Zhang,Jiao He,Yongan Tang,Tingchao He,Qiang Sun,Dianyuan Fan,Yu Wang
The development of emitting materials that present both photoluminescence (PL) and X-ray excited optical luminescence has recently been attracting rising research interest for visualization applications. We introduced in this study the hydrothermally crystallized (Sr 1- x Mn x ) 5 (PO 4 ) 3 F 1- y Cl y ( x = 0–0.05, y = 0–0.40) nanorods with favorable PL and X-ray excited optical luminescence properties after composition modulating. The effects of solution pH and Cl − incorporation on structure and morphology of the products were firstly unveiled. (Sr 1- x Mn x ) 5 (PO 4 ) 3 F gives green emission at ∼548 nm ( 4 T 1 ( 4 G) → 6 A 1 ( 6 S)) under either 402 nm excitation or X-ray irradiation, and the optimal PL and X-ray excited optical luminescence were observed at x = 0.03. The replacement of F − by larger Cl − led to the generation of an amount of Frenkel defects (the dislocated F − and anion vacancies V F . ) along the c -axis, benefit from which the (Sr 0.97 Mn 0.03 ) 5 (PO 4 ) 3 F 1- y Cl y samples present enhanced PL and X-ray excited optical luminescence intensities by factors of 1.6 and 7.4, respectively, and the corresponding optimal y values are determined to be 0.20 and 0.30. Fluorescence decay analysis found steadily shortened fluorescent lifetime for Mn 2+ at higher Mn 2+ and Cl − concentrations, and the underlying mechanism was discussed. The (Sr,Mn) 5 (PO 4 ) 3 (F,Cl) apatite material, with enhanced PL and X-ray excited optical luminescence, may find novel applications for both lighting and scintillating.
研究领域:
材料科学
·
光学
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FOOD CHEMISTRY
·
2023
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IF 8.8
Ying Xu,Jun Qi,Manman Yu,Ruishu Zhang,Hengxun Lin,Huimin Yan,Chao Li,Jingmin Jia,Yong Hu
This study aimed to determine the efficacy of star anise dietary fiber (SADF) in alleviating the oxidative damage of myofibrillar protein (MP) from the perspective of volatile components. SADF and SADF without essential oils (EOs) (NSADF) were added to oxidized MP. The addition of NSADF and SADF improved the water-holding capacity (WHC) and gel strength, with the 0.4% addition showing the highest values. Moreover, the WHC of MP from the SADF-treated group was significantly higher than that from the NSADF-treated group at the same dosage, suggesting that EOs in SADF improved the WHC through antioxidation. EOs in SADF prevented the attack of hydroxyl radicals on MP, increasing the β-sheet level and decreasing the random coil level, which was supported by the results of FT-IR, carbonyl content, and sulfhydryl content. Limonene and anisaldehyde present in EOs played an antioxidant role, and anisaldehyde could scavenge free radicals through demethoxylation.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Yunpeng Liu,Xupo Liu,Cuicui Zhang,Ye Chen,Zhitao Wang,Gangya Wei,Jing Zhang,Tianfang Yang,Fengxian Zhang,Shuyan Gao
Fe-N-C catalysts have served as ideal catalysts for oxygen reduction reaction (ORR), but the strong adsorption to ORR-relevant intermediates and less utilization of Fe-N x sites endow those catalysts with inferior performance. Here, an efficient catalyst consisted of Fe-N x species and FeF 2 /Fe 3 C nanoparticles co-anchored on N, F co-doped carbon nanotubes (Fe-NF-CNTs) has been constructed through a surface modification strategy. Sodium trifluoroacetate as functional linker modified on metal-organic framework surface promotes to form abundant and accessible active sites. FeF 2 /Fe 3 C nanoparticles and hydrogen fluoride generated in pyrolysis process facilitate to construct N, F co-doped CNTs with defects and holes. N, F co-doping modifies the adsorption characteristic of Fe-N x sites, while CNTs improve the accessibility of active sites and the capability of material transport. Therefore, Fe-NF-CNTs exhibits outstanding activity (E 1/2 = 0.85 V) and stabilization (ΔE = 6 mV, 10k cycles). Impressively, Fe-NF-CNTs delivers high power density (144 and 68 mW cm –2 ) and cycle stability (300 and 60 h) in liquid and flexible Zn-air batteries, respectively. This work provides a surface modification strategy to guide the tuning of electronic structure of efficient ORR catalysts designed for renewable green energy.
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Journal of Fungi
·
2023
·Vol. 9
·期 1
·94
·
IF 4.7
Azizullah,Muhammad Noman,Yizhou Gao,Hui Wang,Xiaohui Xiong,Jiajing Wang,Dayong Li,Fengming Song
SUMOylation is an essential protein modification process that regulates numerous crucial cellular and biochemical processes in phytopathogenic fungi, and thus plays important roles in multiple biological functions. The present study characterizes the SUMOylation pathway components, including SMT3 (SUMO), AOS1 (an E1 enzyme), UBC9 (an E2 enzyme), and MMS21 (an E3 ligase), inFusarium oxysporumf. sp.niveum(Fon), the causative agent of watermelon Fusarium wilt, in terms of the phylogenetic relationship, gene/protein structures, and basic biological functions. The SUMOylation components FonSMT3, FonAOS1, FonUBC9, and FonMMS21 are predominantly located in the nucleus.FonSMT3,FonAOS1,FonUBC9, andFonMMS21are highly expressed in the germinating macroconidia, but their expression is downregulated gradually in infected watermelon roots with the disease progression. The disruption ofFonUBA2andFonSIZ1seems to be lethal inFon. The deletion mutant strains forFonSMT3,FonAOS1,FonUBC9, andFonMMS21are viable, but exhibit significant defects in vegetative growth, asexual reproduction, conidial morphology, spore germination, responses to metal ions and DNA-damaging agents, and apoptosis. The disruption ofFonSMT3,FonAOS1,FonUBC9, andFonMMS21enhances sensitivity to cell wall-perturbing agents, but confers tolerance to digestion by cell wall-degrading enzymes. Furthermore, the disruption ofFonSMT3,FonAOS1, andFonUBC9negatively regulates autophagy inFon. Overall, these results demonstrate that the SUMOylation pathway plays vital roles in regulating multiple basic biological processes inFon, and, thus, can serve as a potential target for developing a disease management approach to control Fusarium wilt in watermelon.Keywords:asexual reproduction;cell death;cell wall integrity;Fusarium oxysporumf. sp.niveum;mycelial growth;stress response;SUMOylation pathway;watermelon
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ACS Applied Polymer Materials
·
2023
·
IF 5
Yumiao Su,Wenmu Li
Proton exchange membranes prepared from poly(aryl sulfone)s still need to overcome the drawbacks of chemical stability in acidic environments and low electrical conductivity due to water loss at high temperatures. Herein, we synthesized densely sulfonated poly(aryl sulfone) proton exchange membranes containing a 1H-imidazo[4,5-F][1,10]-phenanthroline moiety on the side chain with a metal ion coordination function. The coordination of 1H-imidazo[4,5-F][1,10]-phenanthroline groups to metal ions can effectively prevent the formation of •OH radicals from homolytic cleavage of H2O2 catalyzed by metal ions. Since the conditions for the continuous formation of •OH radicals are fundamentally eliminated, the antioxidant stability of the membrane material is greatly improved. Mesoscale microscopic simulations showed that 1H-imidazo[4,5-F][1,10]-phenanthroline has the effect of inducing phase separation, endowing the proton exchange membrane with a larger hydrophilic structural domain and possibly constructing a better connected channel for proton transport. Notably, these membranes can efficiently capture the Fe2+ and Fe3+ ions to form stable [Fe(phen)3]2+ and [Fe(phen)3]3+ interconnection points, respectively, which could not only enforce the water retention and the mechanical properties of the membranes but also serve as a catalyzed point to prevent H2O2 from undergoing homolytic cleavage and forming •OH radicals.
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JOURNAL OF SOLID STATE CHEMISTRY
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2021
·
IF 3.498
Chentao Hou,Huayang Liu,Fahim Bakhtari Mohammad
In this study, the transformation relationship between HTiOF 3 and TiOF 2 under hydrothermal conditions was discussed first. With the progress of hydrothermal reaction , HTiOF 3 with small hexagonal structure gradually transformed into TiOF 2 with large cubic structure. Secondly, the effects of alkaline hydrothermal treatment and ion-exchange treatment on the phase and morphology of HTiOF 3 and TiOF 2 were investigated. It was confirmed that hexagonal HTiOF 3 can be used as precursor to prepare fluorine doped H 2 Ti 3 O 7 (F–H 2 Ti 3 O 7 ) nanosheets with ordered mesoporous structure by simple alkaline hydrothermal and ion-exchange methods. The prepared F–H 2 Ti 3 O 7 nanosheets have ordered mesoporous structure, providing a high specific surface area of 404.08 m 2 /g and a macroporous volume of 0.46 cm 3 /g. F–H 2 Ti 3 O 7 can be adsorb tetracycline hydrochloride (TCH) on its surface and then degraded it via photocatalytic processes. Furthermore, herein for the first time the photocatalytic degradation path of TCH by F–H 2 Ti 3 O 7 through the synergistic effect of sensitization and LMCT was proposed. Besides, the reusability study showed that F–H 2 Ti 3 O 7 has the ability to degrade the tetracycline hydrochloride efficiently after five cycles and slightly its high degradation rate change from 92.90% to 82.10% under simulated sunlight. In addition, F–H 2 Ti 3 O 7 has good sedimentation performance, which provides the possibility for the practical application of the photocatalyst .
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JOURNAL OF FLUORESCENCE
·
2021
·Vol. 31
·期 4
·1125-1132
·
IF 2.217
Wu Chuqiao,Lin Xin,Wang Qianming
The new design strategy will provide the possibility for preparing a dynamic sensor by employing the inhibition of C = N isomerization. In this work, the functional probe 4-(1 H-imidazo [4,5-f] [1,10]-phenanthrolin-2-yl) benzaldehyde oxime (compound 4 ) has been synthesized and such molecule gives rise to blue emission. Due to the incorporation of hypochlorite, the oxime group can be oxidized to the structure of aldehyde. As a result, the molecular motif exhibits sharp emission change from blue to green due to the addition of hypochlorite with enough sensitivity and selectivity (detection limit = 53 nM, linear range 0.5-8.0 µM). It has also been used for monitoring ClO − by employing solution color change and the absorption signal difference could effectively rule out the effects of interference species. To our knowledge, it will be the first case of a highly selective hypochlorite sensor derived from oxime isomerization reaction based on phenanthroline backbone.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Dong Guo,Yongqiang Wang,Chen Chen,Jiaqi He,Meilin Zhu,Jie Chen,Conglu Zhang
The synthesis of Vis-light driven catalysts with high photocatalytic performance and efficient activation of persulfate requires new strategies. Herein, a multistage structural tuning graphitic carbon nitride co-modified by Co, S (pg-C 3 N 4 /Co 3 O 4 /CoS) was synthesized for the first time through in-situ template method and microwave sulfurization treatment. A photocatalysis-PMS oxidation coupling system was also proposed. The results showed that the introduction of cobalt could improve the photocatalysis and PMS activation efficiency of the graphitic carbon nitride. Further sulfurization treatment could generate more active sites for PMS activation and increase the interlayer distance of carbon nitride to broaden the absorption range of Vis-light. Density functional theory (DFT) calculations indicated the migration of electrons from carbon nitride to CoS promoted the recycling of Co 3+ /Co 2+ . In the coupling system, BPF 50 mL (30 mg L -1 ) was degraded by 99% in 10 min with 0.1 g L -1 catalyst and 0.32 mmol L -1 PMS. The degradation rate was 4 times faster than that of pure PMS system under visible light. Notably, BPF was effectively mineralized and TOC removal rate reached 90%. The stability and recycling experiments showed that pg-C 3 N 4 /Co 3 O 4 /CoS maintained high catalytic performance under complex matrix and multiple cycles, and could be quickly separated and recovered due to the magnetic Co 3 O 4 . This work will provide a new strategy for the development of multi performance catalytic materials, and the proposed photocatalysis-PMS coupling system has huge potential for the wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Fan Zhang,Renjie Ji,Yonghong Liu,Zhijian Li,Zheng Liu,Shuaichen Lu,Yating Wang,Xinlei Wu,Hui Jin,Baoping Cai
Exploring the low-cost and high-efficient electrocatalysts with Pt-like activity for alkaline hydrogen evolution through water splitting is imperative yet challenging. Herein, a simple synthesis combined with electrodeposition and facile electro-oxidation is developed to construct the hollow dendritic self-supported electrode (HDSE). X-ray photoelectron spectroscopy (XPS), X-ray absorption fine structure (XAFS), and electron paramagnetic resonance (EPR) reveal that the surface of HDSE contains the abundant NiO, which is further decorated by fluorine (F)-doped and oxygen vacancies after electro-oxidation process. The resultant HDSE achieves an excellent electrocatalytic performance for hydrogen evolution reaction (HER) in alkaline condition, leading to the extremely low overpotential of 13 mV to drive a current density of −10 mA·cm −2 , and exhibits the long-time stability at the current density of −100 mA·cm −2 and −500 mA·cm −2 , which is superior to the electrocatalytic ability of Pt/C. Density functional theory (DFT) calculations illustrate the NiO modulated by F-doping and oxygen vacancy, could synergistically improve the charge distribution, enhance the conductivity of NiO structure, and optimize the adsorption energy for intermediates of HER, thus accelerating the electrocatalytic ability for hydrogen evolution. This work opens up a new avenue toward the reasonable design of high-efficient and low-cost electrocatalysts for alkaline hydrogen evolution reaction.
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Qingxia Yuan,Jing Zhang,Chulei Xiao,Chaligan Harqin,Mingyang Ma,Tao Long,Zhenghui Li,Yanling Yang,Jikai Liu,Longyan Zhao
A novel heteropolysaccharide with about twenty sugar residues named DF80-2 was obtained from Angelica pubescens Maxim. f. biserrata Shan et Yuan root, one of the most widely used traditional Chinese medicines for thousands of years in China. The possible structure of DF80-2 was proposed considering the comprehensive results of physicochemical properties, methylation analysis, and 1D/2D NMR spectroscopy, which showed that its main chain was composed of (1→3)-, and (1→4)-linked-α- d -Glc p , (1→4)-linked-β- d -Gal p , (1→6)-linked-α- d -Man p , and (1→3)-linked-α- l -Ara f , and the branch was present as the α- d -Glc p -(1→3)-β- d -Gal p A disaccharides stretched from O -6 position of (1→4)-linked-α- d -Glc moiety in the main chain. Congo red analysis, scanning electron microscopy and atomic force microscopy showed that DF80-2 possessed a triple helical conformation, and its branched monomers were interlaced with one another forming a regular network structure. DF80-2 exhibited antioxidant activity by effectively scavenging DPPH, and hydroxyl radicals, and chelating ferrous ions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2015
·
IF 3.313
Xiaojing Li,Chunmei Zeng,Guangyin Fan
Graphene-like transition metal carbide [Ti 3 C 2 X 2 (X = OH and/or F)]-supported RuNi bimetallic nanoparticles (NPs) were synthesized from the co-reduction of ruthenium chloride and nickel chloride with Ti 3 C 2 X 2 as a stabilizer and carrier. Ti 3 C 2 X 2 -supported RuNi NPs were well dispersed in aqueous solution. The as-synthesized composites were applied as catalysts in the hydrolysis of ammonia borane (AB), which is a promising solid-state hydrogen storage material for portable fuel cell application . Results indicated that the RuNi/Ti 3 C 2 X 2 catalyst was highly active for the hydrolysis of AB at room temperature , with the highest turnover frequency number of 824.7 mol H 2 ·(mol Ru·min) −1 . The activation energy for the hydrolysis of AB in the aqueous phase reached 25.7 kJ/mol, which was lower than most of the reported values.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Mei Ming,Yanlin Ren,Min Hu,Yun Zhang,Ting Sun,Yuling Ma,Xiaojing Li,Weidong Jiang,Daojiang Gao,Jian Bi,Guangyin Fan
Exploring MXenes as supports for synthesis of highly efficient catalysts are extremely important for hydrodechlorination of chlorophenols because of the acute toxicity and strong potential bioaccumulation of chlorophenols. We reported a facile strategy to synthesize Rh nanoparticles deposited on 2D alk-Ti 3 C 2 X 2 (X = O, F) (alk-Ti 3 C 2 X 2 for short) MXene, which was prepared through the removal of the Al layers of Ti 3 AlC 2 and post-treatment by alkalization. Modifying the Ti 3 C 2 X 2 support by alkalization triggered the substitution of surface fluorine groups with surface oxygen species. The changes in the surface chemistry of alk-Ti 3 C 2 X 2 effectively prevented particle aggregation to form well-dispersed Rh nanoparticles in small sizes with relative high metal dispersion, thereafter improving the hydrogen uptake capacity of the catalyst. Consequently, the Rh/alk-Ti 3 C 2 X 2 catalyst significantly enhanced the catalytic performance for the HDC reaction, which could be assigned to the large number of active components from small Rh nanoparticles. This strategy provides a basis for investigating the use of MXenes as supports to synthesize well-defined metal nanoparticles in 2D layered structures for potential applications.
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