CATALYSIS LETTERS
·
2021
·Vol. 152
·期 5
·1495-1505
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IF 3.186
Zhang Yue,Wang Li,Ma Qingqing,Wang Nan,Pan Zhiyong
SBA-15 was modified via post-treatment with (NH 4 ) 2 SiF 6 and (NH 4 ) 3 AlF 6 solution (NSF-T and NAF-T) and applied as support of Pd catalysts for the hydrogenation of 2-ethyl-anthraquinone (EAQ). The characterization results revealed that F could be incorporated into the framework of SBA-15 by forming Si–F bond and the amount of F increased as the molar ratio of F in treating solution to Si species in SBA-15 (F/Si) increased from 0.1 to 0.4 for NSF-T and 0.3 to 0.6 for NAF-T. At the same F/Si, the incorporated amount of F was larger with NSF-T than with NAF-T, and the latter could simultaneously create acid sites in catalysts. The hydrophobicity of catalysts could be effectively improved by incorporating F into SBA-15 supports, which favored the catalytic performance. The catalyst on SBA-15 treated by NSF with F/Si of 0.3 exhibited the high initial activity (0.24 molH 2 ·gPd −1 ·min −1 ) and selectivity (95.5%). Graphic Abstract
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Ruijie Xie,Dongxue Lei,Yujie Zhan,Biyuan Liu,Chi Him A. Tsang,Yuxuan Zeng,Kai Li,Dennis Y.C. Leung,Haibao Huang
The application of photocatalytic oxidation (PCO) of volatile organic compounds (VOCs) is strongly limited by catalyst deactivation , low mineralization ability and mass-transfer in gas-solid phase. Wet-scrubbing coupled with PCO (WPCO) provides a novel and efficient method for VOCs degradation. Fluorine-doped TiO 2 (F-TiO 2 ) photocatalyst was prepared and applied in this coupled process for toluene degradation. Toluene removal efficiency reached 80% over F-TiO 2 , while it was only 25% over TiO 2 in the WPCO process. As for gas-solid PCO process, F-TiO 2 had a low toluene removal efficiency of 10%. Furthermore, the mineralization capability of WPCO process over F-TiO 2 also remarkably increased, achieving about 92 ppmv CO 2 generated from toluene oxidation . Compared with TiO 2 , the surface fluorinated TiO 2 significantly enhanced toluene degradation since it generated mobile hydroxyl radical ( OH) in the WPCO process. The F/Ti molar ratio ( R F ) greatly affected photocatalytic activity towards toluene degradation, and the F-TiO 2 with R F at 1 obtained the best performance. The photocatalytic activity of F-TiO 2 had good stability and remained highly efficient after four runs.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Li Liu,Sadat Anwar,Haizhen Ding,Mingsheng Xu,Qiang Yin,Yazhong Xiao,Xingyuan Yang,Manqing Yan,Hong Bi
Carbon dots (CDs) as a new type of carbon nanomaterial have gained tremendous attention due to their wide applications in photocatalyst, sensor, bioimaging and so on. In the present work, a novel kind of fluorine and nitrogen co-doped CDs (F,N-CDs) have been synthesized from 5-fluorouracil (5-Fu) and p -phenylenediamine ( p -PD) via a hydrothermal method . An electrochemical sensor for detecting catechol was designed and constructed on the basis of F,N-CDs and laccase (Lac). Compared with the traditional detection methods of catechol, the as-fabricated sensor Lac-F,N-CDs/glassy carbon electrode (GCE) shows a comparatively low detection limit (0.014 μM) as well as a high sensitivity (219.17 μA cm −2 mΜ −1 ) through the amperometric i-t responses method. The most significant feature of the sensor is its long cycle stability and can be used for many times (≥50) under ambient conditions. The prepared Lac-F,N-CDs/GCE sensor has been employed for detection of catechol in tap water and lake water successfully. This work provides a new pathway to stabilize laccase by using CDs and other carbon nanomaterials to construct efficient electrochemical sensor for detecting catechol and its analogue.
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 20
·12538-12546
·
IF 10.733
Wanhua Wang,Yi Yang,Daoming Huan,Likun Wang,Nai Shi,Yun Xie,Changrong Xia,Ranran Peng,Yalin Lu
Driven by the increasing global energy demand, the development of innovative energy conversion and storage systems is becoming more and more urgent. As one of the attractive means, water splitting has attracted widespread attention because of its great potential in storing electricity in the form of chemical fuel which also makes it a promising solution to the utilization of non-grid electricity generated by solar or wind. The oxygen evolution reaction (OER) is generally deemed as the key rate-limiting step of water splitting, and thus studying efficient OER electrocatalysts with a low overpotential and good stability is of vital importance. Here, we successfully prepared an OER catalyst with excellent electrochemical performance through a simple anion doping. Firstly, a stable cubic perovskite SrCoO3−δ was prepared by anion F-doping instead of traditional A and/or B site doping. Secondly, SrCoO2.85−δF0.15 demonstrates excellent OER activity superior to its parent hexagonal compound H-Sr2Co2O5 and those perovskites prepared via complicated A- and/or B-site doping. DFT calculations and XPS investigations reveal that the cubic structure and the highly oxidative oxygen species (O22−/O−) via F− doping jointly contribute to the better OER properties of SrCoO2.85−δF0.15. Our work brings forth a promising strategy to stabilize cubic structures from hexagonal ones via a simple anion doping strategy, which may open a new avenue for the development of even more effective OER catalysts and may be applied in many other fields related to structure transformation, in addition to energy and catalysis fields.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Heng Zhang,Zhen Wang,Xiaoqing Yang,Zi-Long Li,Linhao Sun,Jimei Ma,Hong Jiang
A sensitive nanocomplex probe prepared from fluorescent polydopamine nanoparticles (F-PDA) and cobalt oxyhydroxide (CoOOH) nanosheets was established for the determination of α-glucosidase activity. In this detection system, the fluorescence of F-PDA was firstly quenched by CoOOH nanosheets based on fluorescence resonance energy transfer (FRET). Subsequently, ascorbic acid was produced from 2-O-α- d -glucopyranosyl- l -ascorbic acid which was selectively hydrolyzed by α-glucosidase. CoOOH was reduced to Co 2+ by the released ascorbic acid, which resulted in the recovery of F-PDA nanoparticles fluorescence. In consequence, α-glucosidase activity was determined by the fluorescence recovery degree of the F-PDA nanoparticle. This fluorescent method showed a good linear relationship with the activity of α-glucosidase from 2 to 80 U L −1 and low detection limit of 1.65 U L −1 (S/N = 3). This fluorescence probe with high selectivity and sensitivity demonstrated a remarkable applicability in human serum samples and provided an alternative for α-glucosidase inhibitors screening in the discovery of anti-diabetes drugs.
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高影响因子
SOLID STATE IONICS
·
2019
·
IF 2.886
Hengxu Song,Yuhong Zhao,Yongqiang Niu,Hua Hou
Medium-temperature molten salt reserve primary cell utilizes low-melting nitrate electrolyte, that is considered suitable for geothermal borehole as well as oil and gas exploration . In this work, Cr 3+ and F − ions were introduced into spinel lithium manganate oxides by high-temperature solid-state method and verified by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The effects of fluorine content on the morphology and discharge performance of the LiCr 0.1 Mn 1.9 O 4− x F x (0 ≤ x ≤ 0.5) have been studied in LiCr 0.1 Mn 1.9 O 4− x F x /LiNO 3 -KNO 3 -Ca(NO 3 ) 2 /Li-Mg-B system. Fluoride-doped samples have a significant improvement in discharge performance at the condition of 10 mA·cm −2 and 250 °C because of the stabilization of the crystal structure. Factors of operating temperature and current density have a significant effect on battery discharge performance, and the surroundings of 10 mA·cm −2 and 200–250 °C contributes the battery to achieve high performance. That indicates the LiCr 0.1 Mn 1.9 O 4− x F x /LiNO 3 -KNO 3 -Ca(NO 3 ) 2 /Li-Mg-B battery shows great potential in geothermal borehole as well as oil and gas exploration environment.
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Nanoscale
·
2015
·Vol. 7
·期 47
·20033-20041
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IF 7.394
Yafei Zhao,Liyi Shi,Jianhui Fang,Xin Feng
Carbon dots (CDs) have shown great promise in a wide range of bioapplications due to their tunable optical properties and noncytotoxicity. For the first time, a rational strategy was designed to construct new bio-nanoplatforms based on carboxylic acid terminated CDs (CDs-COOH) conjugating with amino terminated F-substituted nano-hydroxyapatite (NFAp) via EDC/NHS coupling chemistry. The monodisperse NFAp nanorods were functionalized with o-phosphoethanolamine (PEA) to provide them with amino groups and render them hydrophilic with respect to the ligand exchange process. The CDs-COOH@PEA-NFAp conjugates exhibits bright blue fluorescence under UV illumination, excellent photostability and colloidal stability. Due to their low cytotoxicity and good biocompatibility as determined by methyl thiazolyl tetrazolium (MTT) assay, the CDs-COOH@PEA-NFAp conjugates were successfully applied as bio-nanoplatforms to MCF-7 breast cancer cells for cellular imaging in vitro. More importantly, the functional CDs conjugated to NFAp provide an extended and general approach to construct different water-soluble NFAp bio-nanoplatforms for other easily functionalised luminescent materials. Therefore, these green nanoplatforms may be a prospective candidate for applications in bioimaging or targeted biological therapy and drug delivery.
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MATERIALS LETTERS
·
2015
·
IF 2.489
Zhang Leilei,Li Hejun,Li Kezhi,Liu Shoujie,Zhang Yulei,Yao Pei,Zhang Wenqi,Chen Guanzheng
A multi-layer coating composed of SiC inner-layer and Mg and F co-substituted hydroxyapatite/chitosan hybrid out-layer for carbon fibers has been synthesized using a combination method of chemical vapor deposition , electrochemical deposition and ion exchange method. The morphology, microstructure and in-vitro bioactivity of the multi-layer coating are analyzed. The results show that the SiC inner-layer exhibits a squamous shape. Mg and F co-substituted hydroxyapatite/chitosan hybrid out-layer covers the SiC inner-layer coated carbon fiber entirely and uniformly with a flat structure. The multi-layer coating could induce the precipitation of particle-shaped apatite crystals with Ca/P molar ratios of 1.34–1.51 on its surface in simulated body fluid. The multi-layer SiC/Mg and F co-substituted hydroxyapatite/chitosan coated carbon fibers should have potential application for tissue engineering.
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NANOTECHNOLOGY
·
2025
·Vol. 36
·期 14
·145601
·
IF 2.8
Xinyu Shi,Libo Deng,Lingna Sun,Qianling Zhang,Xiangzhong Ren,Yongliang Li
Manganese dioxide (MnO2) is recognized as a promising candidate for the oxygen evolution reaction (OER); however, its practical application is hindered by limited active sites and low electrical conductivity. Fluorine (F), known for its strong electron affinity and electronegativity, can modulate the surface electronic structure and physicochemical properties of catalysts. In this study, we synthesized MnO2 nanosheets and fluorine-doped MnO2 (F-MnO2) using simple hydrothermal and ion-exchange methods. We then assessed the influence of fluorine doping on the intrinsic OER activity and stability of these catalysts, as well as their underlying catalytic mechanisms. By manipulating the amount of fluorine introduced and the fluorination temperature, we explored the relationship between varying fluorine concentrations and OER performance. The experimental results show that F-MnO2 exhibits higher OER activity than pristine MnO2. At a current density of 10 mA cm–2, the overpotential required for F-MnO2 is merely 320 mV, substantially lower than that of pristine MnO2. This enhanced performance is ascribed to fluorine doping, which leads to an increased quantity of active Mn3+ centers and oxygen vacancies, along with an expanded electrochemically active surface area. Furthermore, F-MnO2 displays improved stability during the testing period. It maintains long-term stability for over 25 h, further corroborating the catalyst's excellent anti-oxidation and anti-corrosion properties in alkaline water electrolysis.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yi Zhong,Chenhan Zhang,Zhihua Ying,Yuan Jiang,Weiqin Sheng
Nitrogen dioxide (NO 2 ) is a significant air pollutant with a notable environmental impact, necessitating precise monitoring. However, most existing NO 2 sensing materials exhibit low sensitivity and require high-temperature operation. In this study, we employed a hydrothermal and co-precipitation method to synthesize a novel ternary nanocomposite , In 2 O 3 /SnO 2 nanoparticles (NPs)/fluorine-doped carbon quantum dots (F-CDs). By varying the mass ratio of In 2 O 3 to SnO 2 NPs, we investigated the gas-sensing performance of the composite towards NO 2 . The results demonstrate that when the ratio of SnO 2 and In 2 O 3 reaches to 1 : 2, the 2-In 2 O 3 /SnO 2 /F-CDs gas sensor exhibited the highest response, excellent selectivity , and remarkable stability under ultraviolet (UV) light irradiation at room temperature (∼25 °C). Furthermore, the response of the 2-In 2 O 3 /SnO 2 /F-CDs gas sensor displayed a strong linear relationship with the concentration of NO 2 gas. At a NO 2 gas concentration of 3 ppm, the sensitivity was 238, which is significantly higher than that of In 2 O 3 /SnO 2 NPs and In 2 O 3 sensors. The response time and recovery time were measured at 62 s and 33 s, respectively. Finally, based on experimental characterization results and band structure analysis, we confirmed the promising effects of ternary nanocomposite in enhancing gas sensing.
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BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Di Wu,Zhiming Zhang,Zhuodong Yu,Liang Zhu
Food to microorganisms (F/M) ratio is one of the most important factors affecting microbial growth and pollutant removal in biological wastewater treatment system. For stability of aerobic granular process, optimal range of F/M ratio and a maneuverable F/M ratio control method via quantitative sludge discharge were investigated in this study. Results showed that stable aerobic granules were achieved with good settleability, high pollutant removal efficiency and microbial diversity when F/M ratio was controlled at 0.4–0.5 gCOD/gSS d. In addition, a maneuverable F/M ratio control method via quantitative sludge discharge was developed to verify the feasibility for optimization of F/M ratio. By this method, aerobic granules cultivated with the F/M ratio of 0.4 ± 0.02 gCOD/gSS d had better pollutant removal performance and stable structure with higher protein-like components in EPS. This study further revealed the importance of F/M ratio in the stability of aerobic granular sludge process.
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高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 3
·e202402822
·
IF 2
Linbo Chen,Yingying Zhu,Di Wang,Jinyuan Zhu,Yumeng Ren,Geng Chen
Graphical A novel Co─FCN heterojunction photocatalyst was synthesized by introducing Co 3 O 4 and fluorine into graphitic carbon nitride (CN) using a simple one-pot pyrolysis method. The photocatalytic activity was assessed through the photodegradation of Rhodamine B (RhB). The resulting Co─FCN photocatalyst demonstrated superior photocatalytic performance and stability compared to pure CN. Photocatalysis is an effective solution to degrade organic dye discharge in wastewater treatment due to its efficiency, environmental friendliness and cost-effectiveness. However, issues such as limited visible light absorption and rapid charge carrier recombination hinder its practical use. In this research, the heterojunction (Co─FCN) composed of carbon fluoride nitride and cobalt tetroxide (Co 3 O 4 ) was successfully prepared by a simple one-pot pyrolysis method. The obtained nanocomposites showed their efficiency as photocatalyst in the photodecomposition of Rhodamine B (RhB). The relationship between microstructure and properties of photocatalyst was studied in detail by means of characterization techniques. The results showed that the RhB degradation efficiency of Co 3 ─FCN was 92.91% within 60 min irradiation time. The results of free radical scavenging experiments show that superoxide anion (·O 2− ) and hydroxyl radical (·OH) are the main active species in Co─FCN composite catalysts. In addition, the potential degradation pathway of RhB was inferred based on the intermediates detected by liquid chromatography mass spectrometry (LC-MS), and the preliminary photocatalytic reaction mechanism of Co─FCN heterogeneous catalyst was constructed accordingly. Therefore, this research provides new insights into the preparation and modification of CN photocatalysts, thereby promoting the application potential of efficient photocatalysts in the degradation of organic pollutants.
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