As a hot topic of global concern, the distinguishing and detecting of antibiotic pollution is crucial owing to its adverse effect on ecosystems and human health stemming from excessive use and poor ...management. Herein, a water‐stable lanthanide coordination polymer sensor (Dy‐TCPB) with multiple emitting centers is prepared. The versatile Dy‐TCPB can conveniently differentiate various antibiotics, and displays a self‐calibration luminescent response to nitrofurazone (NFZ) and furazolidone (FZD). Each antibiotic exhibits notable correlation to a unique combination of the two ligand‐to‐Dy ion emission intensity ratios, enabling two‐dimensional fingerprint recognition. Furthermore, the novel self‐calibration sensor demonstrates effective recognition of NFZ and FZD with excellent sensitivity and selectivity, and detection limits as low as 0.0476 and 0.0482 μm for NFZ and FZD, respectively. The synthetic approach for the fabrication of a singular coordination polymer exhibiting multiple emissions provides a promising strategy for the development of facile and effective ratiometric sensors.
Antibiotics detection: A water‐stable coordination polymer (Dy‐TCPB) with multiple emitting centers is applied to distinguish different antibiotics and for ratiometric sensing of nitrofurazone (NFZ) and furazolidone (FZD) with high sensitivity and selectivity. The polymer also shows great recycling ability, so both the synthetic and sensing strategies present a promising approach for the development of low‐cost and effective ratiometric sensors (see scheme).
Lanthanide luminescence sensors have attracted extensive attention in the detection of 2, 6-pyridinedicarboxylic acid (DPA), the main biomarker of anthrax. In previous reports detecting DPA, ...luminescence probes may not have high selectivity and high specificity for identification. In the present study, a highly specific and sensitive luminescence probe was synthesized. In this paper, TbxGd1-x (PBA)2NO3·2H2On is synthesized by solvothermal method using HPBA = 3.5-bis(triazol-1-yl)benzoic acid and Ln (NO3)3·6H2O (Ln = Tb, Gd). Through modulating the molar ratio of Tb3+ ions and Gd3+ ions, the distance between Ln3+ ions is changed, leading to a change in the energy transfer from the ligand to Tb3+, which in turn leads to an increase in luminescence intensity. Meanwhile the luminous colour is regulated by the ratio of Tb/Gd, which changes from green to white as the Gd ion gradually increases. The bimetallic ratiometric luminescence sensor realized accurate, high sensitivity (LOD is 1.03 × 10−6 M) and high selectivity detection of DPA. Due to the simple synthesis method and low technical requirements, this work provides a good strategy for the development of simple and effective bimetallic ratiometric luminescence sensors.
The coordination polymer (Tb0.9Gd0.1-PBA) provides specific recognition of DPA and is a fluorescent sensor with high sensitivity, high selectivity and good interference immunity. In addition the lanthanide ion doping method described in this paper allows the development of more multicentre luminescent sensing materials for the large number of available Ln-MOFs. This work will expand the application of Ln-MOFs in chemical sensing and inspire other researchers to explore in this direction. Display omitted
•The bimetallic lanthanide coordination polymers exhibit high selectivity, fast response, DPA-specific recognition.•The bimetallic lanthanide coordination polymers have low detection limits and high sensitivity to DPA.•Luminescence sensors utilize a two-dimensional decoding map for the precise identification of DPA.•The luminescence colour can be changed by adjusting the molar ratio of Tb3+ to Gd3+.
The red-crowned crane (Grus japonensis (Statius Müller, 1776)) is a rare and endangered species that lives in wetlands. In this study, we used variance partitioning and hierarchical partitioning ...methods to explore the red-crowned crane-habitat relationship at multiple scales in the Yellow River Delta Nature Reserve (YRDNR). In addition, we used habitat modeling to identify the cranes' habitat distribution pattern and protection gaps in the YRDNR. The variance partitioning results showed that habitat variables accounted for a substantially larger total and pure variation in crane occupancy than the variation accounted for by spatial variables at the first level. Landscape factors had the largest total (45.13%) and independent effects (17.42%) at the second level. The hierarchical partitioning results showed that the percentage of seepweed tidal flats were the main limiting factor at the landscape scale. Vegetation coverage contributed the greatest independent explanatory power at the plot scale, and patch area was the predominant factor at the patch scale. Our habitat modeling results showed that crane suitable habitat covered more than 26% of the reserve area and that there remained a large protection gap with an area of 20,455 ha, which accounted for 69.51% of the total suitable habitat of cranes. Our study indicates that landscape and plot factors make a relatively large contribution to crane occupancy and that the focus of conservation effects should be directed toward landscape- and plot-level factors by enhancing the protection of seepweed tidal flats, tamarisk-seepweed tidal flats, reed marshes and other natural wetlands. We propose that efforts should be made to strengthen wetland restoration, adjust functional zoning maps, and improve the management of human disturbance in the YRDNR.
Research has proven that the most effective and widely used metal-containing chemotherapy anticancer drugs are cisplatin (cis-PtCl(2)(NH(3))(2)) and many platinum complexes, however, these compounds ...have significant disadvantages including poor water solubility and serious side effects. Thus researches in order to overcome these shortcomings have never interrupted. Many non-platinum complexes have been synthesized and tested, in which some palladium complexes show significant antitumor activity in normal tumor cells and lower resistance of tumor cells to clinical treatments as well as lower side effects. Mononuclear palladium complexes with aromatic N-containing ligands, amino acid ligands, S-donor ligands, and P-containing ligands have respective qualities and properties due to the different structures and properties of the ligands; some dinuclear palladium complexes possess interesting steric structures and good antitumor activity; a try to modify natural medicines with Pd(2+) leads the research to a new route. In this review, medicinal chemistry, the development status and interactions of palladium complexes with DNA are discussed in order to provide guidance and determine structure and antitumor activity relationships for continuing studies of these systems.
Effective detection of contaminants in water, such as pesticides, excess Fe3+ and MnO4−, is critical to human health and environmental protection. They can be quantitatively detected by a new ...luminescent sensor based on a water stable europium metal-organic framework (Eu-MOF). The dual nucleus Eu-MOF is connected by L6−ligands through μ6: η1, η2, η3, η3, η4, η5 coordination to form a 2D wavy network, and then expands into a three-dimensional structure through ligand L6− connection. Due to its high water stability and multiple emission centers, the Eu-MOF can be used as luminescence sensors for pollutants in water. Eu-MOF exhibits high selectivity for Fe3+, MnO4−, and nicosulfuron (NSF) in water through luminescence quenching with low detection limit, and fast response, indicating that Eu-MOF is a reliable analysis platform for multi-responsive sensing.
A simple and reliable novel multi-sensing Eu-MOF was successfully synthesized by solvothermal method for the simultaneous detection of Fe3+, MnO4− and nicosulfuron (NSF). Display omitted
•A novel Eu-MOF was successfully synthesized and characterized.•The luminescence quenching mechanism of Eu-MOF was analyzed.•Fe3+, MnO4−, and NSF were identified by Eu-MOF in 2D and detected in 3D.•Eu-MOF has low the limit of detection for Fe3+, MnO4−, NSF.
Zn3In2S6@SnS2 was synthesized by hydrothermal method. The Zn3In2S6@SnS2 three-dimensional heterostructure exhibits excellent photocatalytic activity, which provides a stable photocatalyst for ...photocatalytic water splitting.
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•SnS2@Zn3In2S6 composites were synthesized from SnS2 nanosheets and Zn3In2S6 microspheres.•SnS2@Zn3In2S6 heterojunctions enhanced photocatalytic H2 production under visible light.•Efficient charge separation and transfer at the heterojunctions explained the improved performance.
A series of Zn3In2S6@SnS2 photocatalysts with different SnS2 mass ratios were prepared by hydrothermal method. Two photoactive sulfide materials were prepared into composite materials for photocatalytic hydrogen evolution under visible light excitation. The unique structure accelerates the separation and transfer of photogenerated electrons and holes. Due to its unique composition advantages, the Zn3In2S6@SnS2 three-dimensional heterostructure without any co-catalyst (SnS2 doping amount of 10 %) exhibited remarkable activity, and its hydrogen production rate was 15443 μmol h−1g−1, indicating high photocatalytic stability for water decomposition. Based on photoelectrochemical (PEC) and hydrogen evolution test, a reasonable photocatalytic mechanism was proposed.
Sm-MOF synthesized by solvothermal method has high thermal stability and good luminescence stability in the pH range of 2–13. The 2D identification system combined with ratio luminescence can better ...distinguish l-tryptophan from various amino acids, this work can make an important contribution to self-calibrating sensing materials.
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•3D new MOF with multiple emissions was successfully synthesized and characterized.•The luminescence enhancement mechanism of Sm-MOF was analyzed.•The detection selectivity and recycling properties were studied.•The sensor was used for the detection of l-tryptophan in plasma.
Amino acids are one of the essential components of the human body. Lack of amino acids can lead to poor concentration, fat gain, memory loss and so on. Herein, a novel lanthanide metal-organic framework (Sm-MOF) was prepared for self-calibrated luminescent recognition of amino acids. Each amino acid is significantly correlated to a unique combination of the two emission intensity ratios of the characteristic peaks of the ligand to Sm3+ ion, making two-dimensional fingerprint recognition possible. It is worth mentioning that the new self-calibrated sensor can detect l-tryptophan (Trp) with excellent sensitivity and selectivity, rapid response (<32 s) and low detection limit (1.32 μM). The luminescence mechanism mainly derived from the energy transfer between Trp and ligand, Sm3+ ions. Furthermore, satisfactory recoveries of 95–107% were obtained in plasma, suggesting the potential application of Sm-MOF in the detection of Trp in plasma.
Two novel palladium(II) complexes with a thiosalicylic acid (HSC
6
H
4
CO
2
H) ligand, with the formulas Pd(TSA)(L)·
m
H
2
O (TSA is thiosalicylic acid; in complex
1
, L is 1,10-phenanthroline and
m
... = 1; in complex
2
, L is 2,2′-bipyridine and
m
= 2), have been synthesized and characterized. The coordination geometry of both palladium atoms is square planar; they are four-coordinated and each is coordinated in an N,N,O
−
,S
−
mode. There is a sigmoid oxygen chain in complex
1
, but an oxygen ring in complex
2
. The competitive binding of the complexes to HeLa cell DNA (HL-DNA) has been investigated by fluorescence spectroscopy. The results show that the two complexes have the ability to bind with HL-DNA. Viscosity studies suggest that the complexes bind to DNA by intercalation. Gel electrophoresis assay demonstrated the ability of the complexes to cleave the HL-DNA. The two complexes exhibit cytotoxic specificity and a significant cancer cell inhibitory rate. The apoptosis tests indicated that the complexes have an apoptotic effect. Furthermore, complex
1
exhibits more biological activity than complex
2
, which is mainly because the area of the aromatic ring of 1,10-phenanthroline is larger than that of 2,2′-bipyridine.
•A two-step hydrothermal strategy is adopted to transform Ni3Fe(CN)62 to NiFe2O4.•NiFe2O4@rGO slice is prepared as electrode for flexible symmetric supercapacitor.•NiFe2O4@rGO electrode shows ...excellent specific capacitance and cycling stability.
A high working voltage and specific capacitance are vital for flexible solid-state symmetric supercapacitor (FSSC) devices to achieve decent energy densities with high power. In this paper, we report a 1.8 V FSSC based on NiFe2O4 nanocubes anchored on reduced graphene oxide (rGO) cryogel electrode. Through surface protection by a free-standing three-dimensional cross-linked network structure, NiFe2O4 converted from Ni3Fe(CN)62 inhibits the original nanocube structure. Benefiting from the synergistic effects between NiFe2O4 nanocubes and graphene nanosheets, the newly synthesized NiFe2O4@rGO hybrid electrode delivers a high charge storage capacity (488 F g−1 at a constant current density of 1 A g−1), excellent rate ability and cycling performance (89.8% of the initial capacitance value after 10,000 cycles). In addition, NiFe2O4@rGO FSSC has been assembled and exhibits stable behavior at bend state, as well as high energy density of 62.5 Wh kg−1, and long cycle life (93.2% of the initial capacitance value after 6000 cycles). The proposed strategy for controlling the design and synthesis of NiFe2O4@rGO nanostructures provides promise for the development of high performance electrode in advanced energy storage devices.
With global warming and 2050 carbon reduction targets, the demand for Liquefied Natural Gas (LNG) marine transportation continues to increase. LNG carriers that experience emergency unseaworthy ...accidents at sea have the need for emergency transfer rescue, which brings many safety management issues for ships and coastal waters due to high risk of LNG leakage. This paper investigates the impacts on the ship and marine safety caused by the LNG leakage and diffusion from ship-to-ship (STS) emergency transfer operations on coastal waters. Firstly, the computational fluid dynamics (CFD) method is used to establish an LNG STS transfer leakage diffusion model. Then, LNG dispersion characteristics and the range of the vapour cloud in transfer operating waters under accident conditions with different wind speeds and wind angles are calculated and simulated. The results show that the diffusion of LNG vapour cloud is significantly influenced by wind speed and hull restrictions, and the flammable volume fraction and 1% volume fraction of the LNG vapour cloud spread to different distances through transport effect, mixing and dilution effect of wind. In addition, an LNG cryogenic hazard zone exists in the vicinity of the leakage point. This study can provide the guidance to authorities to formulate disaster prevention, mitigation regulations, and emergency response measures, which can benefit marine safety management in coastal waters.
•LNG leakages from STS emergency transfer on coastal waters are simulated and analysed.•Mechanism of LNG vapour diffusion effected by navigation environment in narrow waters are investigated.•Hazard migration measures for LNG STS transfer operations are proposed.
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