JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2022
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IF 5.141
Xiufeng Wang,Yunyun Zhang,Yao Jin,Siqi Wang,Zhiqing Zhang,Ting Zhou,Guodong Zhang,Fang Wang
Quantum dots (QDs) are excellent fluorescent indicators for chemical and biological analysis. In this paper, an Off-Off fluorescence sensor based on ZnS quantum dots was designed. It was found that Co 2+ can quench the fluorescence of ZnS QDs, moreover glutathione (GSH) can further quench the fluorescence. Therefore, this method can be used for indirect detection of GSH. However, if change Co 2+ into other metal ions, the system cannot be used to detect GSH indirectly. For direct detection GSH, that is adding GSH without Co 2+ , the fluorescence intensity changes little, while only amino acid or monosaccharide has no effect. When indirect detection of GSH based on this Off-Off fluorescent probe, the fluorescence quenching was linearly related to the concentration range of 1–300 μM GSH, and the detection limit could reach 0.48 μM, which can rival most Off-On and On-Off fluorescent probe. The relative standard deviation for parallel measurement of 300 μmol·L -1 GSH solution (for n = 10) was 1.43 %.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Junyan Zhang,Wenjing Su,Bin Yi,Yafei Guo,Tianlong Deng,Xiaoping Yu
Electrochemical method is a green lithium extraction method, but this technology is limited by the stability and capacity of the electrodes. Herein, a new strategy for the preparation of highly stable and high-capacity electrodes by in-situ polymerization and synchronous conversion was developed. It was found that when resorcinol and formaldehyde containing soluble Li, Fe, and P sources were polymerized in-situ and then carbonized at 700 °C, the Li, Fe, and P sources were successfully converted into LiFePO 4 and uniformly dispersed in the carbon matrix. The carbon in the material formed a three-dimensional (3D) skeleton in the form of interconnected carbon spheres, and the LiFePO 4 was grown in-situ on the 3D carbon skeleton. Since no polymer binder was used, the electrode exhibited high hydrophilicity and stability. Especially, the unique hierarchical porous structure of the electrode makes it have high electrochemical and lithium extraction performance. Even for Li + with a concentration of only 100 mg·L −1 , the intercalation capacity reached 5.13 mg·cm −3 , which was nearly twice that of the electrode prepared by the traditional method. The equilibrium time for Li + intercalation was only 45 min, and the dissolution loss rate of Fe 3+ was no more than 0.23 % after 50 CV cycles. Based on these excellent properties, the porous carbon-supported LiFePO 4 electrode prepared will has a broad application prospect for lithium recovery from aqueous solutions by the green electrochemical technology , and the preparation strategy developed in this work also provides a new prospective for the preparation of high-performance lithium extraction electrodes.
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高影响因子
Polymers
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2022
·Vol. 14
·期 22
·4888
·
IF 4.967
Jia Qu,Hongpu Huang,Qiang Yang,Wei Gong,Meilan Li,Liangliang Chang,Baoyue Cao,Guochun Zhang,Chunsheng Zhou
Water pollution is a worldwide problem that requires urgent attention and prevention and exceeding use of heavy-metal ions is one of the most harmful factors, which poses a serious threat to human health and the ecological environment. In this work, a magnetic oxidized micro/mesoporous carbon (MOMMC) was prepared for the easy separation of Cu(II) and Pb(II) from water. The dual-template method was used to prepare micro/mesoporous carbon using sucrose as the carbon source, silica nanoparticles formed by tetraethyl orthosilicate as the microporous templates, and triblock copolymer F127 as the mesoporous template. MOMMC was obtained by oxidation using potassium persulfate and then magnetized through in situ synthesis of Fe3O4nanoparticles. FTIR, TG-DSC, XRD, TEM, SEM, nitrogen adsorption–desorption isotherms, zeta potential, and VSM were used to confirm the synthetic process, structure, and basic properties of MOMMC. The high-saturation magnetization (59.6 emu·g−1) of MOMMC indicated its easy and fast separation from water by an external magnetic field. Kinetics studies showed that the adsorption of Cu(II) and Pb(II) on MOMMC fit the pseudo-second-order model well. Isotherm studies showed that the adsorption behavior of Cu(II) was better described by the Langmuir model, and the adsorption behavior of Pb(II) was better described by both Langmuir and Redlich–Peterson models. MOMMC obtained efficient adsorption for Cu(II) and Pb(II) with the large adsorption capacity of 877.19 and 943.40 mg·g−1according to the Langmuir adsorption isotherm equation, and a better selectivity for Pb(II) was observed in competitive adsorption. MOMMC still possessed a large adsorption capacity for Cu(II) and Pb(II) after three adsorption–desorption cycles. These findings show that MOMMC represents an excellent adsorption material for the efficient removal of heavy-metal ions.Keywords:magnetic mesoporous carbon;adsorption;copper;lead;adsorption kinetics;adsorption isotherms;selectivity
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PubMed
高影响因子
CHEMOSPHERE
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2022
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IF 8.943
Zhongbao Ma,Long-Fei Ren,Diwen Ying,Jinping Jia,Jiahui Shao
The separation of hardness ions such as calcium and magnesium from hard water can improve water quality, which is important but technically challenging. Nanofiltration (NF) has attracted much attention because of its efficiency, environmental friendliness and low cost. However, common NF membranes with a singly (either positively or negatively) charged layer have insufficient water softening capacity. In this work, two types of dual-layer Janus charged polyamide NF membranes composed of oppositely charged inner and outer layers were developed for the first time by sequential electrospray polymerization strategy for efficient water softening. The effect of the microstructure of the dually charged barrier layer on the separation performance of divalent salt ions was explored. Detailed mechanistic studies revealed that the microstructure of the outer layer of the barrier layer played a crucial role in the ion separation of the Janus membrane due to its control of the reverse transport of ions. Janus charged polyamide NF membrane with a loose outer layer exhibited better water softening performance (93.6% of hardness removed) compared to the singly charged NF membranes due to the simultaneous dual electrostatic effect and no ion reverse transport confinement. This Janus charged NF membrane also possessed good antifouling performance, mainly due to its negatively charged outer layers. The mechanistic insights gained in this study reveal the huge potential of microstructural design toward high-performance Janus charged NF membranes, and provide important guidance on the future development of high-efficiency water softening NF membranes.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
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2022
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IF 7.336
Weijie Fu,Kai Zhang,Xiaohua Zhang,Guorong Fan,Zongde Wang,Shangxing Chen,Yangping Wen,Peng Wang
Transition metal sulfide functionalized hierarchically porous carbons as colorimetric-electrochemical dual-mode nanozyme sensing platform for the visual qualitative colorimetric and quantitative electrochemical detection of dopamine (DA) are synthesized by hydrothermal method using Chinese fevervine herb rich in sulfur as the carbon source and sulfur source, and different transition metal chlorides as the metal sources. The introduction of FeCl 3 is more favorable to the generation of micropores, while the introduction of other transition metal chlorides is beneficial to the generation of mesopores and macropores. FeS 2 functionalized hierarchically porous carbon (FSPC) with large specific surface area shows better conductivity, more excellent electrocatalytic ability, and higher peroxidase-like and oxidase-like activities. The inhibitory colorimetric assay for DA designed by the oxidase-like properties of FSPC without the intervention of H 2 O 2 , making the reaction system more stable. FSPC displays excellent electrochemical responses for DA with about 50-fold peak current compared with bare electrode, and possesses a low detection limit of 0.015 μM (S/ N = 3) in a wide linear range of 0.05–1000 μM. This work will provide a new idea for the nanozyme sensing of DA with colorimetric-electrochemical dual-mode and a new possibility for application in clinical medicine.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Li Jing,Lingwei Yang,Yanxiang Liang,Sijia Shen,Jun Zhang,Liping Liu,Changhao Zhao,Haojun Ma,Guolin Wang
Ceramic matrix composite is widely applied in thermal protection system (TPS) of space vehicles to resist ultrahigh temperature aerodynamic heating. In this work, a novel carbon fiber reinforced hafnium carbide matrix composite (C f /HfC) is fabricated, and its potential serving as TPS material is studied inside an inductively coupled plasma wind tunnel. The oxidation mechanism of the as-fabricated C f /HfC is thus revealed in the dissociated air flows with different heat fluxes, based on the temperature profiles and the microstructural evolutions of HfO 2 oxide scale. The results suggest a transition in the oxidation activity of C f /HfC at 1650–1700 °C in reduced pressure (<10 kPa), from reaction-control to diffusion-control, due to the accumulation of porous HfO 2 oxide scale. When its thickness beyond a critical value, inner diffusions of oxidized species dominate the oxidation activity of C f /HfC. The thicker the HfO 2 is, the weaker the oxidation of C f /HfC can be in dissociated air plasmas. The oxidation mechanism endows C f /HfC with an excellent thermal protection property at ultrahigh temperatures (≥2000 °C). However, when the oxidation temperature ≥2700 °C, due to strong melt and evaporation, the continuity of HfO 2 is interrupted, which results in degradation of the oxidation blockage ability. As a result, C f /HfC is strongly ablated in the dissociated air plasmas. This infers that C f /HfC can be applied in TPS by preventing strong melt and dissipation of HfO 2 , and it is suggested to control the surface temperature of C f /HfC lower than 2700 °C in reduced pressures. This work may forward the advance of the novel material in the TPS of future space vehicles.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Yingxin Li,Wei Qian,Yinqun Hua,Yunxia Ye,Fengze Dai,Jie Cai
Thermal barrier coatings with excellent thermal performance and corrosion resistance are essential for improving the performance of aero-engines. In this paper, (Y 3-x Yb x )(Al 5-x Sc x )O 12 (x = 0, 0.1, 0.2, 0.3) thermal barrier coating materials were synthesized by a combination of sol-gel method and ball milling refinement method. The thermal properties of the (Y 3-x Yb x )(Al 5-x Sc x )O 12 ceramics were significantly improved by increasing Yb and Sc doping content. Among designed ceramics, (Y 2.8 Yb 0.2 )(Al 4.8 Sc 0.2 )O 12 (YS-YAG) showed the lowest thermal conductivity (1.58 Wm −1 K −1 , at 800 °C) and the highest thermal expansion coefficient (10.7 × 10 −6 K −1 , at 1000 °C). In addition, calcium-magnesium- aluminum -silicate (CMAS) corrosion resistance of YS-YAG was further investigated. It was observed that YS-YAG ceramic effectively prevented CMAS corrosion due to its chemical inertness to CMAS as well as its unique and complex structure. Due to the excellent thermal properties and CMAS corrosion resistance, YS-YAG is considered to be prospective material for thermal barrier coatings.
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高影响因子
Journal of Energy Storage
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2022
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IF 8.907
Zekun Wang,Xiaoguang Zhang,Xin Min,Minghao Fang
The development of a phase-change composite with a multifunctional response suitable for buildings is critical for minimizing building energy consumption and improving living comfort. In this study, porous carbon materials with high graphitization and excellent three-dimensional pore structures were synthesized using a simple method. The as-synthesized porous carbon and commercial capric acid with a phase transition temperature of 31 °C were combined by vacuum impregnation to form a phase-change composite with excellent shape stability and outstanding thermal properties. The latent heat of fusion in the first cycle of the phase-change composite was 127.1 J/g, and the enthalpy retention rate was as high as 79.24 % after 200 cycles. Meanwhile, the phase-change composite exhibits a photothermal and electrothermal multifunctional response. The photothermal conversion efficiencies of the composites were 55.79 % and 63.56 % under light intensities of 200 and 300 mW cm 2 , respectively. Importantly, the phase-change composite with high electrical conductivity maintained an excellent electrothermal conversion performance when the applied voltage was 1.5 V at room temperature. Overall, the synthesized phase-change composite integrated high latent heat value, good cycling stability, and excellent electrical conductivity , demonstrating promising application prospects in the construction sector for increasing energy conservation and emission reduction.
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高影响因子
MEAT SCIENCE
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2022
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IF 7.077
Yu Shi,Yueying Wang,Xuetao Hu,Zhihua Li,Xiaowei Huang,Jing Liang,Xinai Zhang,Di Zhang,Xiaobo Zou,Jiyong Shi
The quality of marinated meat could be assessed by the uniformity of marinade distribution within it. In this study, the diffusion behavior of sucrose inside the marinated beef was quantitatively characterized from 2D plane and 3D space using hyperspectral imaging (HSI) and finite element analysis (FEA), respectively. Visualization of sucrose content based on HSI showed that the distribution state of sucrose on marinated beef was not uniform. Subsequently, the diffusion behavior of sucrose in the 3D beef geometric model was simulated using FEA. Results revealed that the diffusion rate of sucrose on muscle tissues is significantly higher than other tissues, and the difference in diffusion behavior is the main reason for the inhomogeneous distribution of sucrose. The quantitative characterization of marinade diffusion behavior makes it possible to predict the marinade's transient distribution state, thereby determining the optimal marinade conditions for the meat. Therefore, the method proposed has practical significance for evaluating and regulating the quality of marinated meat products.
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PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2022
·
IF 5.895
Zhen Li,Qiang Huang,Yu Zheng,Yong Zhang,Xin Li,Shiqing Zhong,Zhijiang Zeng
Identifying the components of Camellia oleifera honey and pollen and conducting corresponding toxicological tests are essential to revealing the mechanism of Camellia oleifera toxicity to honey bees. In this research, we investigated the saccharides and alkaloids in honey, nectar, and pollen from Camellia oleifera, which were compared with honey, nectar, and pollen from Brassica napus, a widely planted flowering plant. The result showed that melibiose, manninotriose, raffinose, stachyose, and lower amounts of santonin and caffeine were found in Camellia oleifera nectar, pollen, and honey but not in B. napus nectar, pollen, and honey. Toxicological experiments indicated that manninotriose, raffinose, and stachyose in Camellia oleifera honey are toxic to bees, while alkaloids in Camellia oleifera pollen are not toxic to honey bees. The toxicity mechanism of oligosaccharides revealed by temporal metabolic profiling is that oligosaccharides cannot be further digested by honey bees and thus get accumulated in honey bees, disturbing the synthesis and metabolism of trehalose, ultimately causing honey bee mortality.
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高影响因子
ANALYST
·
2022
·Vol. 147
·期 24
·5655-5662
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IF 5.227
Ying Zhou,Ruichun Li,Guomei Zhang,Yan Zhang,Caihong Zhang,Shaomin Shuang
Metal–organic frameworks (MOFs) have emerged as interesting nanomaterials owing to their large surface area, high porosity, tunable pore architecture and easy functionalization. However, an inferior electrical conductivity hinders their application in electrochemical sensing. In this paper, gold–palladium alloy/UiO-66-NH2/graphene (AuPd/UiO-66-NH2/GN) composites were synthesized by loading alloys on the surfaces of MOFs and then attaching them to the graphene surface. The addition of metal nanoparticles and graphene enhanced the electron transfer ability of MOFs. Then, composites were used to modify a glassy carbon electrode (GCE) to construct a sensitive dopamine (DA) electrochemical sensor. The developed sensor manifested two linear relationships in lower concentration ranges and in higher concentration ranges with a 0.21 × 10−6 mol L−1 low detection limit (3σ/k) under optimal conditions. The results certified that the constructed sensor had high selectivity, excellent reproducibility and good stability, and had been used successfully for DA detection in actual human serum samples.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Haotian Ma,Li Guan,Mingjun Chen,You Zhang,Yue Wu,Zhenyang Liu,Dawei Wang,Fenghe Wang,Xu Li
The utilization of biomass is an important approach to supplying sustainable carbon sources for green chemistry, by which the product could be more environmentally friendly and lower toxicity. In this work, the local fruit Mopan persimmons were used to be a carbon source to prepare carbon quantum dots (MP-CQDs) via the hydrothermal method. A series of characteristics were applied to the carbon dots to study the structural and optical properties. The results demonstrated that the MP-CQDs were well synthesized and coated by N, O-related surface functional groups. The PL of MP-CQDs showed an excitation-dependent behavior, whose peak shifted from 446 nm to 545 nm under the excitation wavelength from 350 nm to 450 nm. After a selectivity study on different metal ions, we found that MP-CQDs were sensitive to Fe 3+ ions, and the limit of detection (LOD) was determined as 0.324 μM with the 3σ rule. Further, by mixing MP-CQDs with sugar, we successfully applied MP-CQDs to the anti-counterfeiting field by painting anti-counterfeiting patterns with the combination of commercial fluorescent ink (CFI) and MP-CQDs@sugar ink (MPI). The pattern can present different fluorescent properties under 365 nm, 395 nm, and 450 nm respectively. The results revealed that biomass-derived MP-CQDs were a promising candidate for Fe 3+ ions detection and anti-counterfeiting application.
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高影响因子
危险品化学品经营许可证（带存储）