JOURNAL OF LUMINESCENCE
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2023
·
IF 3.6
Fan Chen,Xiao-Jun Wang,Xuehu Zhang,Changhua Zhang
Lead-free halide perovskites have recently evoked considerable interest in illumination and display, due to their intriguing optical properties . Herein, we present an efficient and facile strategy to prepare Cs 2 InCl 5-x Br x ·H 2 O (x = 0–5) perovskites . The preparation was performed at a low temperature of 80 °C under atmospheric pressure, and required no complex technological process. Comparing with that prepared by the traditional hydrothermal method , the emission intensity of the prepared Cs 2 InX 5 ·H 2 O (X = Cl/Br) perovskites were increased by two times. Besides, Sb 3+ ions were successfully doped into the matrix of Cs 2 InX 5 ·H 2 O (X = Cl/Br) by our method. After doping with Sb 3+ , the emission intensities of Cs 2 InX 5 ·H 2 O were greatly enhanced, with enhanced by a factor of ∼187 and ∼102, respectively. Importantly, the PLQYs were greatly improved, reaching 79.6% and 42.7%, respectively. Additionally, the effects of Br − on luminescent properties of Cs 2 InCl 5-x Br x ·H 2 O:Sb 3+ (x = 0–5) were also investigated in this work. Though the control of the Br − content, tunable emissions from 575 nm to 630 nm were achieved. These results indicate the prepared samples could be promising environmentally-friendly materials for lightings. Furthermore, this work presents a reliable and simple method for preparing high-quality perovskites.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Huimin Li,Xinyuan Huang,Ye Lv,Jinli Zhang,Wei Li
The biomass electrochemical oxidation has attracted worldwide attention owning to its carbon-neutral and sustainable nature. Here, different morphologies of CoCu-carbonate hydroxides (CH) electrodes are prepared through one-step hydrothermal method for 5-hydroxymethylfurfural electrocatalytic oxidation (HMF-ECO) to high-valued 2,5-furandicarboxylic acid (FDCA) for the first time. The results illustrate that Cu can regulate CoCu–CH morphologies from 1D nanorods to 2D ultra-thin nanosheets besides modulating the catalytic compositions . The optimal Co 1 Cu 1 –CH exhibits hybrid nanostructures containing the 1D nanorods and 2D ultra-thin nanosheets , which has the largest ECSA and specific surface area, as well as the smallest Tafel slope and impedance. The oxidation potential of HMF-ECO is 1.42 V vs RHE with the conversion of HMF 99.57%, the selectivity for FDCA 99.91%, and the FE 98.88%. In addition, Cu can promote the conversion of Co 2+ to the favorable Co 3+ for HMF-ECO on the catalyst surface . Density functional theory calculation indicates that Cu can improve charges transfer to HMF and lower its adsorption energy . In situ Raman spectra tests indicate that cobalt species is the active site for HMF-ECO. Furthermore, at 1.42 V vs RHE, the coupling of HMF-ECO and hydrogen evolution reaction shows that the cathodic hydrogen evolution rate is 92.33 L h −1 m −2 , which is 3.69 times more than water splitting. This work provides a special structures material to process intensification of HMF electrooxidation coupling hydrogen production .
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GLYCOCONJUGATE JOURNAL
·
2023
·Vol. 40
·期 4
·435-448
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IF 3
Bai Ruifeng,Wang Jingyi,Brockhausen Inka,Gao Yin
The presence of N -glycolylneuraminic acid (Neu5Gc), a non-human sialic acid in cancer patients, is currently attributed to the consumption of red meat. Excess dietary red meat has been considered a risk factor causing chronic inflammation and for the development of cancers. However, it remains unknown whether Neu5Gc can be generated via a chemical reaction rather than via a metabolic pathway in the presence of high levels of reactive oxygen species (ROS) found in the inflammatory and tumor environments. In this study, the conversion of N -acetylneuraminic acid (Neu5Ac) to Neu5Gc has been assessed in vitro under conditions mimicking the hydroxyl radical-rich humoral environment found in inflammatory and cancerous tissues. As a result, Neu5Gc has been detected via liquid chromatography-multiple reaction monitoring mass spectrometry. Furthermore, this conversion has also been found to take place in serum biomatrix containing ROS and in cancer cell cultures with induced ROS production.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 32
·78988-79000
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IF 5.8
Dong Jiayu,Song Xianni,Zhang Shuchi,Tan Mengyu,Zhao Haiyan,Wu Donglei
A novel hierarchical Cu/ZSM-5 was prepared over alkaline treatment and incipient wet impregnation method for the catalytic ozonation of polyvinyl alcohol (PVA). Under the optimum preparation conditions, hierarchical Cu/ZSM-5 exhibited an excellent mineralization performance during the PVA degradation process, and the removal rate of TOC after 60 min of reaction was 47.86%, much higher than that of ozonation alone (5.40%). Its high catalytic activity could attribute to the large pore volume (0.27 cm 3 /g) and pore size (6.51 nm) which are beneficial for the distribution of loaded copper and adsorption performance for PVA. Compared to ·OH, 1 O 2 (2.66 times in 10 min) contributed more to the removal of PVA. The degradation of PVA was a combined process of direct ozone oxidation, catalytic ozonation and adsorption. With its high catalytic performance and stability, hierarchical Cu/ZSM-5 has a very broad application prospect in the process of catalytic ozonation of refractory pollutants.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yanyan Xu,Wenwen Xiao,Pengli Ge,Wenguang Zeng,Qingshan Liu,Zhengyuan Gao,Yongbo Yan
This work aimed to develop a high-efficiency and reliable alternative for conventional and toxic corrosion inhibitor. A novel tetrazole derivative (1-Phenyltetrazole-5-thiol, PTT) that possessed excellent anti-corrosion capacity was exploited for the first time. Based on the traditional electrochemical investigation, morphological observation, and computer modeling, inhibition ability and adsorption type of PTT for X70 steel in 0.5 M H 2 SO 4 were varied. The electrochemical results showed that PTT was a mixed organic inhibitor, which could retard charge transfer impedance, and slowed down the corrosion rate of steel. Specifically, the highest inhibition efficiency was 95.1% when the added PTT dose was 2 mM. The adsorption model showed that the PTT film was formed via powerful physicochemical adsorption. As shown in theoretical calculations, the lower Δ E , higher μ values and E binding value of PTT corresponded to supreme adsorption performance, which was also a manifestation of the PTT high-efficiency corrosion inhibition.
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CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Guozhi Fan,Yi Chen,Yuchan Lu,Qunpeng Cheng,Bo Chai,Guangsen Song
UiO-66-derived H 2 N-UiO-66-SO 3 H with acid-base active sites was used for the co-production of 5-hydroxymethyl furfural (5-HMF) and furfural (FUR) in the direct conversion of holocellulose composed of cellulose and hemicellulose. The prepared catalyst was further characterized by various techniques, confirming its formation, structure, and composition. H 2 N-UiO-66-SO 3 H displayed excellent performance for the selective conversion of holocellulose to 5-HMF and FUR, achieving yields of 39.1 % and 28.2 %, respectively. The reusability of the catalyst was also investigated by direct use after recycling without any pretreatment. The results indicated that H 2 N-UiO-66-SO 3 H had good stability, and after four cycles, the yields of 5-HMF and FUR decreased only slightly to 37.2 % and 27.1 %, respectively. The recyclable catalyst H 2 N-UiO-66-SO 3 H for the effective conversion of holocellulose to 5-HMF and FUR demonstrated application potential for the utilization of lignocellulosic biomass.
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Catalysts
·
2023
·Vol. 13
·期 4
·776
·
IF 3.9
Xing Shen,Kairui Liu
Single-atom catalysts (SACs) have been synthesized using a variety of methods in recent years, and they have shown excellent catalytic activities. However, metal atoms show a high tendency to agglomerate in liquid media, making the single atom synthesis more difficult in liquid media. The synthesis of such metal single-atom catalysts that do not have strong ligand coordination is rarely reported in the literature. Herein, we report the facile synthesis of monodispersed Au atoms (Au1) through the reduction in HAuCl4in 15-crown-5. The complete reduction in HAuCl4was confirmed through UV-Vis spectroscopy. In addition, the Au was found in a zero valence state after reduction, which was confirmed through XPS and XANES results. Moreover, the dispersion of Au was confirmed as a single atom (Au1) through transmission electron microscopy and spherical aberration electron microscopy. The possible structure of this catalyst was proposed by matching the EXAFS results with the structure of Au1@15-crown-5 as -(OC2H4O)-AuCl2H2. The Au1@15-crown-5 showed high activity (TOF as high as 22,075) in the reduction in nitrophenol and nitroaniline to aminophenol and phenylenediamine by sodium borohydride. Because of the monodispersion of Au atoms, its performance is much better than noble nanoparticles and non-precious metal catalysts.Keywords:gold;single atom;nitroaromatic compounds reduction;catalysis
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MOLECULES
·
2023
·Vol. 28
·期 7
·3040
·
IF 4.6
Lei Zhao,Shichao Du,Rui Gong,Wanqi Jia,Zhimin Chen,Zhiyu Ren
The renewable-energy-driven integration of hydrogen production and biomass conversion into value-added products is desirable for the current global energy transition, but still a challenge. Herein, carbon-coated CoO–Co heterojunction arrays were built on copper foam (CoO–Co@C/CF) by the carbothermal reduction to catalyze the hydrogen evolution reaction (HER) coupled with a 5-hydroxymethylfurfural electrooxidation reaction (HMFEOR). The electronic modulation induced by the CoO–Co heterojunction endows CoO–Co@C/CF with a powerful catalytic ability. CoO–Co@C/CF is energetic for HER, yielding an overpotential of 69 mV at 10 mA·cm−1and Tafel slope of 58 mV·dec−1. Meanwhile, CoO–Co@C/CF delivers an excellent electrochemical activity for the selective conversion from HMF into 2,5-furandicarboxylic acid (FDCA), achieving a conversion of 100%, FDCA yield of 99.4% and faradaic efficiency of 99.4% at the lower oxidation potential, along with an excellent cycling stability. The integrated CoO–Co@C/CF||CoO–Co@C/CF configuration actualizes the H2O–HMF-coupled electrolysis at a satisfactory cell voltage of 1.448 V at 10 mA·cm−2. This work highlights the feasibility of engineering double active sites for the coupled electrolytic system.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Hao Zhang,Runze Zhang,Wendi Zhang,Bang Gu,Qinghu Tang,Qiue Cao,Wenhao Fang
Constructing functionalized surface for heterogeneous catalysts is vital toward effective conversion of biomass. We show that Pt nanoparticles (ca. 2.1 nm) loaded on Co-Nb bimetallic oxide can efficiently catalyze the aqueous-phase base-free aerobic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid. We ingeniously construct different surface element-distributions over three Co-Nb oxides (Nb@Co, Co&Nb and Co@Nb) with the same bulk composition by changing precipitation sequence of Co and Nb precursors. This strategy allows rationally modulating synergistic interaction and surface acidity of Co-Nb oxides and in return boosts the pristine oxidation activity of loaded-Pt nanoparticles. We use kinetic investigations, comprehensive characterizations, and particularly in situ DRIFT-IR adsorption technique (CO, pyridine and furfural as probe molecules) to unravel the origin of synergistic catalysis. We disclose that Nb 5+ -enriched surface can formulate sufficient Lewis acidic sites and stabilize electron-rich Pt 0 active centers, accelerating the tandem oxidation of HMF and the intermediates. The Co@Nb-Pt catalyst shows the highest productivity of FDCA (25 mmol FDCA mol Pt –1 h –1 ) among all Pt catalysts in the literature and achieves > 99% yield of FDCA at 110 °C and 10 bar of O 2 .
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 12
·6375-6383
·
IF 11.9
Yixuan Feng,Kun Yang,Richard L. Smith,Xinhua Qi
Electrochemical oxidation of 5-hydroxymethylfurfural (HMF) is an efficient and sustainable way to produce a 2,5-furandicarboxylic acid (FDCA) monomer. In this study, two-dimensional (2D) metal–organic framework (MOF) nanoarrays embedded with Ni/Co/Fe sulfide nanoclusters were employed as electrocatalysts for HMF oxidation. The as-prepared NiCoFeS-MOF catalyst had interlaced structures and achieved 100% HMF conversion, 99% FDCA yields and Faraday efficiencies as high as 99% at 1.39 V vs. RHE driving voltage. Combination of metal sulfide nanoclusters with 2D MOF nanoarrays greatly enlarged the electrochemical active surface area and increased the number of active catalytic sites while improving electron transport. X-ray photoelectron spectroscopy indicated that electronic interactions increased the electron density of metal sites and enhanced intrinsic NiCoFeS-MOF electrooxidation performance. Embedding metal sulfide nanoclusters into MOF nanoarrays using the simple one-step solvothermal method proposed in this work greatly expands the scope of electrode materials available for electrochemical upgrading of biomass-related compounds.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 5
·1-9
·
IF 5.479
Li Guiyin,Zeng Junxiang,Liu Huiling,Ding Ping,Liang Jintao,Nie Xinmin,Zhou Zhide
Alpha-fetoprotein (AFP) is a reliable clinical marker of hepatocellular carcinoma (HCC). A highly sensitive fluorometric aptamer nanoprobe is described for AFP detection. It is based on fluorescence resonance energy transfer (FRET) between AFP aptamer labelled with 5-carboxyfluorescein (FAM) and palladium nanoparticles (PdNPs). The PdNPs quench the green fluorescence of the FAM-AFP aptamer via interactions between nitrogen functional groups of the AFP aptamer and PdNPs. When AFP was introduced into the FAM-AFP aptamer-PdNPs FRET system, the AFP aptamer preferentially combines with AFP. This results in a conformational change and weakens the interaction between the aptamer and the PdNPs. Thus, the fluorescence of FAM recovers. The fluorescence recovery of FAM increases linearly in the 5.0–150 ng·mL −1 AFP concentration range and has a 1.4 ng·mL −1 detection limit. The assay was applied to the analysis of spiked diluted human serum. The recovery values ranged from 98.3 to 112.9%, with relative standard deviations of <1.1%. This biosensing strategy provides a reliable and ultrasensitive protocol for the quantification of biomarkers with relevant antigens and aptamers.
Schematic presentation of a fluorometric aptamer nanoprobe for AFP assay based on fluorescence resonance energy transfer (FRET) between AFP aptamer labelled with 5-carboxyfluorescein (FAM) and palladium nanoparticles (PdNPs).
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Biomaterials Science
·
2019
·Vol. 7
·期 4
·1437-1447
·
IF 5.251
Mengxue Ma,Xiangmei Liu,Lei Tan,Zhenduo Cui,Xianjin Yang,Yanqin Liang,Zhaoyang Li,Yufeng Zheng,Kelvin Wai Kwok Yeung,Shuilin Wu
Implant materials are prone to bacterial infections and cause serious consequences, while traditional antibiotic therapy has a long treatment cycle and even causes bacterial resistance. In this work, a photothermal therapy (PTT) assisted drug release system has been developed on the implant surface for in situ rapid disinfection under 808 nm light irradiation within a short time, in which gentamicin (Gent) is loaded by polyethylene glycol (PEG) modified molybdenum disulfide (MoS2) on Ti surface, and then encapsulated with chitosan (CS) (CS/Gent/PEG/MoS2-Ti). The hyperthermia produced by the coatings irradiated by 808 nm near-infrared (NIR) light can not only accelerate the local release of Gent, but also reduce the activity of bacteria, which makes it easy for these locally released drugs to enter the interior of the bacteria to inhibit the protein synthesis and destroy the cell membrane. When maintained at 50 °C for 5 min under NIR irradiation, this system can achieve an antibacterial efficacy of 99.93% and 99.19% against Escherichia coli and Staphylococcus aureus, respectively. By contrast, even after treatment for 120 min, only a 93.79% antibacterial ratio can be obtained for Gent alone. This is because hyperthermia produced from the coatings during irradiation can assist antibiotics in killing bacteria in a short time. Even under a low dose of 2 μg mL−1, the photothermal effect assisted gentamicin can achieve an antibacterial efficacy of 96.86% within 5 min. In vitro cell culture shows that the modified surface can facilitate cell adhesion, spreading and proliferation. The 7 day subcutaneous infection model confirms that the prepared surface system can exhibit a much faster sterilization and tissue reconstruction than the control group with light assistance. Compared with the traditional drug release system, this photothermy controlled drug-loaded implant surface system can not only provide rapid and high-efficiency in situ sterilization, but also offer long-term prevention of local bacterial infection.
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