COMBUSTION AND FLAME
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2025
·
IF 6.2
Xiandie Zhang,Haozhe Li,Xuxu Cui,Xinwen Ma,Jiaming Liu,Xiaode Guo,Xiang Zhou
The passivation layer of Al powder hinders the mass transfer during Al combustion. Fluorinated oxidants, such as metal fluorides and fluoropolymers, substantially improve the combustion behaviour of Al powder. Herein, a simple solvothermal method is employed to produce a high-entropy acicular accumulational fluorine-containing oxidiser based on ammonium fluoroferrates. The characterization results indicate that heating the fluorine-containing oxidiser can release gaseous products of HF and NH 3 . HF etches the passivation layer, and NH 3 provides kinetic energy to the fuel, resulting in multiple hot spots and secondary combustion as well as prevention of reaction sintering. Compared with traditional FeF 3 , this novel fluorine-containing oxidiser considerably improves the combustion of Al powder by reducing its onset temperature as well as increasing its exothermic enthalpy, flame area and F release ability.
研究领域:
材料科学
·
燃烧化学
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MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yulu Liu,Minghui Zan,Lei Cao,Jiahui Peng,Panyong Wang,Xinpei Pang,Yan Zhang,Li Li,Qian Mei,Wen-Fei Dong
As a kind of common colorant, new coccine has been applied in many scenes of daily life. In this study, innovative F-doped silicon quantum dots (F-SiQDs) which prepared by a facile one-step hydrothermal treatment were designed for the detection of new coccine. Systematic studies demonstrate that the obtained F-SiQDs exhibited excellent dispersibility and photostability, with the optimal emission at 475 nm and fluorescence quantum yield reached to 25.19%. The fluorescence intensity can be quenched by new coccine due to the principle of IFE, and the corresponding process was decreased rapidly within 1 min. At the same time, the quenching process showed a notable linear relationship within the concentration of new coccine range from 1–100 μmol/L and 100–200 μmol/L with the detection limits of 0.33 and 0.18 μmol/L, respectively. The developed F-SiQDs were successfully adopted to the determination of new coccine in food samples, and also achieved the desired detection results after being coated on the filter-paper. This work highlights the merits of simplicity, fast response and highly selective for new coccine detection, and implements a potential avenue for the utilization of F-SiQDs in the guidance of food safety and food management.
研究领域:
纳米技术
·
分析化学
·
食品科学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
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IF 9.136
Xing Zhang,Suhang Chen,Haidong Luo,Zhenhua Tang,Enzhou Liu,Zhao Qin,Kangzhen Xu
The rapid redox cycle of metal active sites and effective surface reactions are crucial factors to activate peroxymonosulfate (PMS) for environmental remediation. Herein, a novel F-g-C 3 N 4 /Mn x Co 3−x O 4 composite as high-efficient PMS activator was successfully constructed by a one-step hydrothermal method for the degradation of 1,1-diamino-2,2-dinitroethylene (FOX-7). It was discovered that F doping could narrow the band gap, and enhance the light absorption range and the separation of photogenerated electron-hole pairs. Among all samples, the catalytic activity of F-CN/MCO was higher than that of MCO and CN/MCO. This can be attributed to the unique materials morphology and the synergistic effect of photocatalytic and chemical catalytic driven PMS activation. Quenching experiments and electron paramagnetic resonance (EPR) proved that both radical and non-radical pathways are responsible for the degradation of FOX-7, and singlet oxygen ( 1 O 2 ) was identified as the predominant active species. Importantly, the synergy between Co 2+ /Co 3+ and Mn 2+ /Mn 3+ couples enhanced more electron transfer and better redox potential, thus greatly promoting the photocatalytic activation of PMS. This work provides a novel approach for designing efficient catalyst to promote the redox behavior of metal species in sulfate radical-based advanced oxidation processes.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 12
·1-10
·
IF 6.408
Liu Xiao-Pan,Sun Wen-Qian,Zhao Meng-Ge,Zhang Xing-Jie,Liu Li-Hong,Chen Chang-Po
An easily prepared fluoro-functionalized ionic covalent organic framework (F-iCOF) has been implemented into MALDI-TOF MS, enabling the highly selective enrichment and sensitive determination of perfluorinated sulfonate (PFS) contaminants in a rapid and convenient manner. The good thermal stability and excellent optical absorption properties of F-iCOF makes it a brilliant matrix with no background noise. Moreover, benefitting from the large surface area, appropriate pore size, good water dispersibility, and abundant fluorine atom and cationic characteristic of F-iCOF, it exhibited superior adsorption capacity and enrichment selectivity towards PFSs. Good signal responses for PFSs were obtained in the presence of various interfering compounds such as BSA, HA, or even more than 100-fold excess of glutamic acid and similar in structure sodium alkyl sulfonates, highlighting the specific selectivity of F-iCOF. Calibration curves for potassium perflurobutane sulfonate (PFBSK) in tap water and whole blood were established with good linear correlation in the range 1–500 pg mL −1 . The limits of detection and quantification for PFBSK were as low as 0.04 pg mL −1 and 0.05 pg mL −1 , respectively, which are comparable or better than the existing methods for the determination of PFSs. Graphical Abstract
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 8
·4319-4333
·
IF 11.9
Chaojie Lyu,Jiarun Cheng,Yuquan Yang,Jiwen Wu,Kaili Wu,Yunguo Yang,Woon-Ming Lau,Ning Wang,Dawei Pang,Jinlong Zheng
Highly dispersed Pt NPs anchored in hierarchically N,F co-doped hollow carbon spheres (Pt@N,F-HCS) were synthesized through a template-assisted strategy followed by fluorination and wet chemical reduction. Due to the introduction of F heteroatoms into the carbon skeleton, the degree of d–π electron conjugation between Pt NPs and N,F-HCS can be enhanced. This will lead to higher Ptx+ content in Pt species, which is beneficial for the effective adsorption of *OOH intermediates and is conducive to O–O bond breaking and triggers the direct 4-electron transfer mechanism for the ORR. In particular, the onset potential and half-wave potential values for the ORR are more positive than Pt@N-HCS without F doping, even outperforming 20%Pt/C. Besides, the Pt@N,F-HCS catalyst also possesses the smallest onset potential and largest methanol oxidation current for the MOR. In alkaline media, abundant OH− will be adsorbed around the Ptx+ sites due to its higher positive valence, and the reaction intermediate COads generated in Ptx+ sites will be further oxidized to the final product, CO2, thus improving the MOR activity and CO tolerance capacity. This heteroatom-doping strategy is favorable for enhancing the interaction between Pt NPs and the carbon-based support, and also provides insight to promote the activity and selectivity for direct methanol fuel cells.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Sikpaam Issaka Alhassan,Haiying Wang,Yingjie He,Lvji Yan,Yuxin Jiang,Bichao Wu,Ting Wang,Haiying Gang,Lei Huang,Linfeng Jin,Yongsheng Chen
Bauxite is a widely available Al-O-rich mineral with great potential for abating fluoride. However, low adsorption capacity, a narrow workable pH range, and a lack of clarity on the best removal mechanism hinder its application. In this work, a highly efficient bauxite nanocomposite (Bx-Ce-La@500) was synthesized via doping and pyrolysis , and its fluoride adsorption in industrial wastewater was examined. Doping Ce/La synergistically improved the fluoride adsorption affinity of the composite (from pH PZC 8.0 ~ 10.0) and enhanced the •OH. The materials were characterized by SEM-EDS, BET, XRD, and TGA while XPS, FTIR, and DFT were used to investigate the mechanism of fluoride sorption . Results show that Bx-Ce-La@ 500 has a positive zeta potential of 26.3–23.1 mV from pH 1~ 10. The Langmuir model was the best fit with a maximum adsorption capacity of 88.13 mg/g and removal efficiency up to 100% in 50 ppm F − solution. The high F − removal was attributed to the enhanced surface affinity and the formation of adequate •OH on the material. Except for carbonate and phosphate ions, other ions exhibited negligible effects and the selective removal of F − in real wastewater was high. The main mechanism of adsorption was the ligand/ion exchange and electrostatic attraction.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Huan Chai,Lili Gao,Peng Wang,Feng Li,Guowen Hu,Jun Jin
The application of hematite(α-Fe 2 O 3 )-based photoanodes in photoelectrochemical (PEC) water oxidation has been hampered by disgusting charge recombination and difficult carrier migration. Herein, we modified indium sulfide (In 2 S 3 ) nanoparticles on the surface of fluorine-doped α-Fe 2 O 3 (F-Fe 2 O 3 ) nanorods . The In 2 S 3 /F-Fe 2 O 3 heterostructure bonded by S-O chemical bond shows a superior photocurrent density of 2.21 mA cm −2 at 1.23 V versus reversible hydrogen electrode (around 3.45 times higher than that of pristine α-Fe 2 O 3 ). In-depth investigations show that In 2 S 3 /F-Fe 2 O 3 has significantly increased donor density and decreased charge transfer resistance. Simultaneously, In 2 S 3 decorated with S-O bond could reduce the surface defect states. Further studies of energy band location reveal the formation of type-Ⅱ heterojunction between In 2 S 3 and F-Fe 2 O 3 . The unique heterostructure provides a powerful driving force for charge separation and transport, resulting in satisfactory bulk phase and surface separation efficiency. This work provides ideas for the design and study of multicomponent photoanodes.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Letian Chen,Yongli Liu,Guohao Cheng,Zegang Fan,Jinyu Yuan,Shuailong He,Guifen Zhu
The widespread occurrence of sulfathiazole (STZ) in the environment has raised concerns regarding the potential risks to ecosystem and human health. Thus, there is a need to develop facile and efficient methods for monitoring STZ. In this study, a novel fluorescent probe, based on N, B, F co-doped carbon dots (N, B, F-CDs), was developed for the highly sensitive and selective determination of STZ. The fluorescent N, B, F-CDs were prepared via a one-step hydrothermal method using malonate and 1-allyl-3-vinylimidazolium tetrafluoroborate ionic liquid as precursors. The obtained N, B, F-CDs exhibited excellent fluorescence response toward STZ due to the inner filter effect (IFE), which caused the fluorescence to be quenched. The fluorescent probe allowed the STZ concentration to be accurately determined with a low detection limit of 5.5 ng mL −1 in two wide linear ranges of 0.008–10 μg mL −1 and 10–45 μg mL −1 . The practicability of the fluorescent probe was further validated in river water, soil, milk, and egg samples, and the satisfactory spiked recoveries of STZ ranged from 96.1 to 101.6%. The proposed fluorescent probe based on N, B, F-CDs can be easily prepared and possess high selectivity and sensitivity, thereby displaying its tremendous potential for the identification and determination of STZ in the environment.
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FOOD AND BIOPRODUCTS PROCESSING
·
2020
·
IF 3.726
Yupeng Lin,Hong He,Qun Huang,Fengping An,Hongbo Song
Low-temperature soluble and soft gelation (LT-SG) pectin belonging to special gum is an important food additive. Flash extraction optimization of pectin from passion fruit ( Passiflora edulis f. flavicarpa ) peel at low temperature (50 °C) by response surface methodology and LT-SG properties was investigated in the present study. Under the optimized conditions of a rotation speed of 5000 r/min, extraction time of 9 min, and the liquid–solid ratio of 42:1 mL/g, the pectin yield was 7.52%. The DE value of 57.02% indicated it was high methoxyl pectin, which easily dissolved at a low temperature (70 °C). Gel texture analysis revealed that the soft gelation properties were depended on the sucrose concentration and pH in the pectin solution. Both adding sucrose and decreasing pH refined gel network structure, as results, the gel texture was strengthened.
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Biomass Conversion and Biorefinery
·
2019
·Vol. 10
·期 4
·795-802
·
IF 2.326
Li Yan,Wu Weibo,Li Hu,Zhao Wenfeng,Yang Song
Furfuryl alcohol (FOL) is one of the versatile molecules in the chemical industry, and can be obtained from the biomass-derived furfural (FAL) via selective hydrogenation. In this study, a mild and rapid protocol was developed for the efficient reduction of FAL to FOL in the presence of an eco-friendly ionic liquid tetrabutylammonium fluoride ([TBA]F) using 1,1,3,3-tetramethyldisiloxane (TMDS) as the hydrogen source. After reacting at room temperature for 5 min, a high FOL yield of 97% with a remarkable TOF value of 310 h −1 could be achieved. The activation of TMDS with fluoride was found to play a key role in the acceleration of the hydrogenation process, and ATR-FTIR and HR-MS were used to verify the possible reaction pathway.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2023
·
IF 3.4
Shu Chen,Li Liu,Hong-Xia Jiang,Qun Sun,Liang Zhang,Jian-Qun Liu,Li-Fang Liu
Tripterygium wilfordii (TW), a well-known traditional Chinese medicine , was widely used in the treatment of autoimmune disorders and inflammatory diseases . However, the clinical use of TW was limited by severe toxicities, such as hepatotoxicity and nephrotoxicity . Our previous studies indicated that roasting was an effective approach for reducing TW-induced toxicity. After roasting, celastrol was completely decomposed, partially converted into 1-hydroxy-2,5,8-trimethyl-9-fluorenone and the total alkaloids content were significantly reduced. However, the detoxication mechanisms of roasting on TW were poorly unknown. This study aimed to explore the toxicity and detoxification mechanisms of TW after roasting based on urine metabolomics. Promising biomarkers were evaluated by multiple comparison analyses. Sixteen toxicity biomarkers were identified between control group and total extract group. Twelve toxicity biomarkers were identified between control group and total alkaloids group. Eight toxicity biomarkers were identified between control group and celastrol group. These metabolites were mainly involved in seven metabolic pathways, summarized as pentose and glucuronate interconversions, lipid metabolism (sphingolipid metabolism, glycerophospholipid metabolisms, fatty acid biosynthesis and steroid hormone biosynthesis) and amino acid metabolism (taurine and hypotaurine metabolism, tryptophan metabolism). After roasting, the toxicities of total extract, total alkaloids and celastrol were relieved by ameliorative serum parameters and pathological changes in hepatic and renal tissues which revealed that the reduction of celastrol and total alkaloids played important roles in the detoxification of roasting on TW. Furthermore, roasting regulated the levels of fourteen potential biomarkers in the total extract group, ten potential biomarkers in the total alkaloids group and seven candidate biomarkers in the celastrol group to normal levels. Biological pathway analysis revealed that roasting may ameliorate TW-induced metabolic disorders in pentose and glucuronate interconversions, lipid metabolism and amino acid metabolism. This study provided evidence for the application of roasting in TW.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 13
·3916-3926
·
IF 5
Guangcheng Zou,Rui Cao,Conghui Cui,Yuqiang Luo,Chen Huang,Xinwei Cui,Zhiwen Wang,Yujie Song
Monolayer Bi2MoO6 nanosheets doped with F atoms (F-BMO-NSs) were developed as catalysts for the one-pot alkylation of nitrobenzene with benzyl alcohol. 95.88% conversion of nitrobenzene coupled with 99.98% selectivity of n-benzylideneaniline was achieved over the F0.04-BMO-NSs under visible light irradiation and 1 atm N2 at room temperature. XPS and EPR results suggested that F doping not only produced enhanced Lewis acid sites (Bi3+ and Mo6+), but also generated Lewis base sites (Mo5+). In situ FTIR spectra revealed that benzyl alcohol would be selectively adsorbed on the enhanced Lewis acid sites via Bi3+ (Mo6+)⋯OH–C– interface coordination, resulting in the activation of HO–C–. Moreover, nitrobenzene would be chemisorbed on the Mo5+ basic sites via Mo5+⋯NO2 coordination, inducing charge transfer from Mo5+ to –NO2. Under visible light irradiation, hydrogen transfer takes place from the chemisorbed benzyl alcohol to nitrobenzene generating benzaldehyde and aniline, finally coupling to form the imine. Based on these surface cooperated functional sites, a synergistic mechanism has been proposed to elucidate the accurate structure–performance relationship. This work provides a new perspective for the design of high activity, high selectivity and high stability photocatalysts for the precise synthesis of imines.
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