JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jiazheng Zhou,Ling Luo,Yu Chu,Peng Wang,Zhiyong Guo,Xin Su,Junjie Li
The Pb x Sn 2−x SiS 4 series from 0 ≤ x ≤ 2 were investigated to study the influence of partial congener cationic substitution on structure and properties. While the centrosymmetric (CS) compounds Pb 2 SiS 4 and Sn 2 SiS 4 crystallizing in the centrosymmetric (CS) P 2 1 / c space group have been reported previously, the partial congener cationic substitution induced CS to noncentrosymmetric (NCS) structural transformation in this system and the formed NCS substitution variant PbSnSiS 4 are introduced here for the first time. PbSnSiS 4 crystallizes in P 2 1 space group with the cell parameters a = 6.4334(8) Å; b = 6.6912(8) Å, c = 8.5037(10) Å, β = 108.576(4) °, Z = 2. The title compound shows a strong second harmonic generation (SHG) response (~ 1.1 × AgGaS 2 ), high laser induced damage threshold (LIDT) (~3 × AgGaS 2 ), and wide IR transparent region from 0.58 to 16.85 µm (down to zero). What’s more, PbSnSiS 4 exhibits good crystal growth habits, and millimeter-scale single crystals (~ 2 × 2 × 1 mm 3 ) were obtained in a spontaneous crystallization way. The theoretical calculations indicate that the optical band gaps decrease with increasing Sn content from Pb 2 SiS 4 (1.94 eV), PbSnSiS 4 (1.82 eV), to Sn 2 SiS 4 (1.69 eV). The results give an insight into the exploration of new NCS compounds with the congener cationic substitution strategy.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Shuai Zhao,Tuoyu Zhou,Aman Khan,Zhengjun Chen,Pu Liu,Xiangkai Li
Electrochemical enzyme biosensors based on various modified electrodes have been developed for bisphenol A detection. However, enzyme activity loss and high cost limit their application. In this study, an electrochemical biosensor was developed for bisphenol A detection by displaying tyrosinase on the surface of Escherichia coli cells, followed by adsorption onto a glassy-carbon electrode. The biosensor exhibited a linear relationship between the concentration range of 0.01–100 nM BPA (R 2 = 0.9967) and the current peak. The detection limit was 0.01 nM, which is higher than that of other chemically modified tyrosinase biosensors. For the detection of bisphenol A in tea and juice samples, the fabricated biosensor presented respectable accuracy comparable to that of high-performance liquid chromatography. Furthermore, high recovery rates (97.78%−100.32%) were obtained. Therefore, this biosensor could be a promising and reliable analytical tool for the detection of bisphenol A.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yanju Chen,Hui Wu,Siwenjie Qian,Xiaoping Yu,Huan Chen,Jian Wu
Heavy metal lead accumulation in the environment pollutes the ecology systems and further threatens the human health. It is necessary to develop a sensitive method to detect it. Here, we propose a highly sensitive lead detection method by combining DNAzyme and CRISPR system. Once the lead ion is recognized, the substrate chain of DNAzyme is cleaved to produce single strand DNA . The produced single strand DNA can be detected by Cas protein/guide RNA complex and further trigger the collateral cleavage effect of CRISPR system, which can indiscriminately cut short single strand DNA reporters. By this way, the detection signals can be greatly amplified. This method can detect lead ions as low as 0.48 nM. The sensitivity is higher than the DNAzyme method. Furthermore, the portable 3D printing device is designed to observe the fluorescent signals so the end-point detection results can be visualized by the naked eyes. The entire detection process can avoid using bulky and expensive instruments, which can promote on-site lead ion detection.
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INORGANIC CHEMISTRY
·
2018
·
IF 4.7
Jingpeng Li,Yiming Zhou,Shiqiang Hao,Tianyan Zhang,Chris Wolverton,Jing Zhao,Li-Dong Zhao
Although the binary sulfides Bi2S3, PbS, and SnS have attracted extensive interest as thermoelectric materials, no quaternary sulfides containing Sn/Pb/Bi/S elements have been reported. Herein, we report the synthesis of a new quaternary sulfide, SnPb2Bi2S6, which crystallizes in the orthorhombic space group Pnma with unit cell parameters of a = 20.5458(12) Å, b = 4.0925(4) Å, c = 13.3219(10) Å. SnPb2Bi2S6 has a lillianite-type crystal structure consisting of two alternately aligned NaCl-type structural motifs separated by a mirror plane of PbS7 monocapped trigonal prisms. In the lillianite homologous series, SnPb2Bi2S6 can be classified as 4,4L, where the superscripted numbers indicate the maximum numbers of edge-sharing octahedra in the two adjacent NaCl-shaped slabs along the diagonal direction. The obtained SnPb2Bi2S6 phase exhibited good thermal stability up to 1000 K and n-type degenerate semiconducting behavior, with a power factor of 3.7 μW cm–1 K–2 at 773 K. Notably, this compound exhibited a very low lattice thermal conductivity of 0.69–0.92 W m–1 K–1 at 300–1000 K. Theoretical calculations revealed that the low thermal conductivity is caused by the complex crystal structure and the related elastic properties of a low Debye temperature, low phonon velocity, and large Grüneisen parameters. A reasonable figure of merit (ZT) of ∼0.3 was obtained at 770 K.
研究领域:
材料科学
·
物理学
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Henan Zhang,Qi Liu,Alena Novoselova,Valeri Smolenski,Jing Yu,Jingyuan Liu,Yongde Yan,Milin Zhang,Jun Wang
The efficient separation of the rare earth element Sm from spent nuclear fuel is of strategic importance for the nuclear industries. This study explored the feasibility of a novel liquid Ga-Pb hybrid electrode for electrochemical extraction of samarium compounds, and the electrochemical reduction mechanism and dynamic properties of Sm(III) ions were provided in NaCl-2CsCl molten salt. It was established that the reduction mechanisms of Sm(III) to Sm(II) and Pb(II) to Pb(0) on the Mo cathode were a one-step reaction processes, respectively, while Ga(III) to Ga(0) was a two-step reaction process. The co-deposition mechanisms of Sm(III), Ga(III) and Pb(II) ions on the Mo cathode were identified, and the types of intermetallic compounds, formation potentials and reaction processes were analyzed. The deposition potential of Sm on Ga-Pb mixed cathode is determined, and the value of its depolarization was greater than on the liquid Pb electrode. Simultaneously, Sm ions have higher exchange current densities and lower activation energies for electrode reactions on the liquid Ga-Pb mixed electrodes than on the liquid Pb electrodes. Furthermore, the electro-separation of NaCl-2CsCl-SmCl 3 molten salt was executed via potentiostatic electrolysis technique, and the separation efficiency and the effect of cathode product type were analyzed and compared in Ga-Pb hybrid electrode and Pb electrode. It was obtained that the maximum extraction efficiency on the Ga-Pb hybrid electrode and the separation efficiency of Sm could reach 91.3 % after 8 h of electrolysis.
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POLYMER
·
2023
·
IF 4.6
Chaoji Xiong,Hao Wang,Zhengbiao Zhang,Kun Liang,Chunhua Wu,Wei Wu,Xiaoping Rao,Qian Chen
Recently the research on the materials for removal of heave metals is surging rapidly. Here we have studied four triazine-based sulfur-containing polymers with different linkers, namely PDT1, PDT2, EDT1, and EDT2. They have been successfully synthesized by the nucleophilic substitution reaction of cyanuric chloride with propane-1,3-dithiol ( PDT1 and PDT2 ) and ethane-1,2-dithiol ( EDT1 and EDT2 ) in different ratios. The physical and chemical properties of these polymers were characterized by scanning electron microscopy, energy dispersive spectroscopy , Fourier transform infrared spectroscopy , porous structure analysis and X-ray photoelectron spectroscopy. The optimized adsorption condition was established by examining dosing, co-existing substances, contact time, concentration, temperature and pH values. The adsorbing properties, which was mainly described by the pseudo-second-order kinetic and Langmuir isothermal model, indicated that the sorption of Hg 2+ was the chemical adsorption . The maximum Hg 2+ sorption capacities of PDT1 , PDT2 , EDT1 and EDT2 were 1440.97 mg g −1 , 715.99 mg g −1 , 237.87 mg g −1 and 181.48 mg g −1 , respectively. Thermodynamically, the adsorption of Hg 2+ by the adsorbent is a spontaneous process. Cyclic experiments demonstrated that all the adsorbents could be reused in five successive adsorption cycles without significant losses in performance. Our density functional theory calculations in combination with relevant experimental results revealed the coordination geometry of Hg and hence mercury-adsorbent chelation mechanism. These results suggested that triazine-based sulfur-containing polymers could be utilized as effective adsorbents for the removal of Hg 2+ from polluted water.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 11
·112504
·
IF 3.9
Xiaocong Zhong,Yahui Ren,Huai Jiang,Kuifang Zhang,Ruixiang Wang,Zhifeng Xu,Boyi Xie,Shuiping Zhong
Based on the outstanding catalytic activity and stability of Mn-Co bimetallic oxides toward oxygen evolution in acidic solutions, MnCo2O4.5 was incorporated into a Pb matrix through a powder pressing-sintering process to obtain a Pb-MnCo2O4.5 composite anode. The results show that compared with the Pb anode that was made via the powder pressing-sintering process (PS-Pb), the oxide layer formed on the Pb-MnCo2O4.5 anode presented a higher flatness, compactness, and β-PbO2 concentration. Consequently, Pb-5.0MnCo2O4.5 presented a stable anodic potential of 1.235 V, approximately 170 mV lower than that of the PS-Pb anode. In the case of lower MnCo2O4.5 content (≤2.5%), the Pb-MnCo2O4.5 composite anode exhibited a smaller Tafel slope (70.39 ∼ 79.59 mV dec−1) and a lower charge transfer resistance (0.437 ∼ 0.676 Ω cm2). The fresh Pb-5.0MnCo2O4.5 composite anode showed a self-corrosion density of 0.25 mA cm−2, approximately 14.3% of that tested on the PS-Pb anode. However, Co2+ and Mn2+ were detected in the electrolyte during 72 h of electrowinning with the Pb-MnCo2O4.5 composite anode. In summary, the Pb-MnCo2O4.5 composite anode has the potential to reduce the energy consumption of the metal-electrowinning process. Nonetheless, it is necessary to evaluate the influence of dissolved Co2+ and Mn2+ on the cathodic process before commercial application.
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Coatings
·
2023
·Vol. 13
·期 9
·1557
·
IF 3.4
Yan Gao,Xin Chen,Ping Xu,Jie Chen,Shihua Yu,Zhigang Liu,Xiaodan Zeng
A novel magnetic fluorescent nanoprobe (Fe3O4@ZnS@MPS(MFNPs)) was synthesized, which recognized and cooperated with Ag+ions, and a rapid method for detecting Ag+was established in solution. It was found by fluorescence spectroscopy analysis that the MFNPs could detect Ag+in PBS solution and, upon addition of Ag+ions, the fluorescence (FL) of MFNPs could be quenched significantly. The sensor has a low limit of detection (LOD) of 7.04 µM for Ag+. The results showed that MFNPs were extremely specific and sensitive for the quantitative detection of Ag+over a wide pH range. Then, the recognition mechanism between MFNPs and guest Ag+was explored via measures of infrared spectroscopy and electron microscopy. It was speculated that the oxygen atoms in the sulfonic acid group cooperated with Ag+to form a synergistic complexation. The assay was successfully used to determine the content of Ag+ in real samples.Keywords:magnetic fluorescent nanosensor;selective recognition;silver ion;3-sulfhydryl-1-propane sodium (MPS)
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Guo Zhao,Xiaochan Wang,Gang Liu,Nguyen Thi Dieu Thuy
In this study, we developed a disposable and flexible electrochemical sensor for the sensitive determination of heavy metal ions based on an efficient one-step laser-induced surface modification. A flexible polyimide film was used as the substrate of the sensor, which was sprayed with a corresponding bismuth precursor ink to form a sensitive coating, i.e., bismuth nanoparticle@laser-induced graphene (BiNP@LIG). Then, Nafion was pipetted on BiNP@LIG to form a cover layer. The BiNP@LIG nanocomposite was successfully synthesized by laser irradiation (470 nm), and the composition of the obtained material was further verified by X-ray diffraction, energy dispersive spectroscopy and Raman spectroscopy. Moreover, the morphology of the BiNP@LIG nanocomposite was investigated by scanning electron microscopy, which showed that BiNPs were uniformly distributed on LIG, and the average diameter of the BiNPs was approximately 38 nm. Finally, a possible sensing mechanism of the Nafion/BiNP@LIG electrochemical sensor was proposed. The results show that the proposed electrochemical sensor exhibited satisfactory sensitivity and stability for the detection of Pb(II) and Cd(II). In addition, the laser-induced surface modification method proposed in this study could be an attractive candidate for the batch fabrication of sensors based on the noncontact, computer-controlled and pattern-making characteristics of laser induction.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Sishun Wang,Kejun Bu,Dong Wang,Chong Zheng,Xiangli Che,Zhen Han,Fuqiang Huang
A new platinum-based ternary selenide, Pt 3 Pb 2 Se 2 was successfully synthesized at 1123 K by using a traditional solid-state method. It crystallizes in a orthorhombic structure with the Cmcm space group, and consists of quasi-2D [Pt 3 Pb 2 Se 2 ] layers connected by inherent Pt–Pb bonds. It is related to the parkerite structures with half transition metal occupation. Therefore, it belongs to the half anti-perovskite family structure. The R-T curve reveals its metallic behavior and shows high conductivity (RRR = 20.5) at room temperature. The X-ray photoelectron and ultraviolet photoelectron spectroscopy spectrums were collected. It has low work function ( ϕ = −4.02 eV). First principles calculations were consistent with the experimental results.
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INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Jingpeng Li,Shiqiang Hao,Shangqing Qu,Christopher Wolverton,Jing Zhao,Yonggang Wang
Transition-metal-based chalcogenides are a series of intriguing semiconductors with applications spanning various fields because of their rich structure and numerous functionalities. This paper reports the crystal structure and basic physical properties of a new quaternary chalcogenide In4Pb5.5Sb5S19. The crystal structure of In4Pb5.5Sb5S19 was determined by both powder and single-crystal X-ray diffraction techniques. In4Pb5.5Sb5S19 crystallizes in the monoclinic system with I2/m space group, and the structure parameters are a = 26.483 Å, b = 3.899 Å, c = 32.696 Å, and β = 111.86°. The polyhedral double chains of Sb3+ and Sb/Pb2+ as the main cations are parallel to each other and form a Jamesonite-like mineral structure through the short chain links of the distorted In, Pb, and Sb polyhedron. In4Pb5.5Sb5S19 exhibits a moderate experimental band gap of 1.42 eV, indicating its potential for application in solar cells and photocatalysis. In addition, In4Pb5.5Sb5S19 exhibits good ambient stability, and differential scanning calorimetry tests demonstrate that it is stable up to 892 K in a nitrogen atmosphere. Moreover, In4Pb5.5Sb5S19 exhibits extremely low thermal conductivity (0.438–0.478 W m–1 K–1 ranging from 300 to 700 K) compared with binary counterparts such as PbS and In2S3. Future chemical manipulation via elemental doping or defect engineering may make the title compound a potential thermoelectric or thermal insulating material.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lanlan Gan,Qian Su,Zhangbao Chen,Xiaoming Yang
Detections of carcinogen and vitamins are generally recognized to be meaningful, especially for nitrites (NO 2 − ) and ascorbic acid (AA). Here blue-fluorescence carbon dots (CDs) with the quantum yield of 11.83% were successfully synthesized by using folic acid and nicotinic acid, and their surfaces were identified to be abundant in the functional groups of amide, carboxyl and hydroxyl. Importantly, the amide on the surfaces of CDs showed the interactions with the nitrites and formed the complex, thus resulting in their quenched fluorescence. To be specific, the fluorescence intensity of CDs proportionally decreased by adding the increased amounts of NO 2 − from 8 to 800 μM, and achieved the detection of NO 2 − at a detection limit of 21.2 µM. Moreover, further introducing ascorbic acid could prevent CDs with NO 2 − to form the complex and recover their fluorescence, and thus providing the new avenue of assaying AA with the generally favorable linear range of 0.1–800 μM, while its related detection limit was 50 µM. In addition, the synthesized CDs exhibited the satisfactory sensitivity toward different pH values, demonstrating their potential of sensing pH. Consequently, the proposed CDs here may provide a new way of monitoring NO 2 − and AA in the target samples.
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