Nanotechnology Reviews
·
2022
·Vol. 11
·期 1
·2038-2049
·
IF 6.739
Haiyun Fan,Pengying Jia,Hailei Zhang,Zhiyi Su,Xinwu Ba,Yonggang Wu
The development of a facile approach to simultaneously detect and separate Hg( ii ) ions in an aqueous solution is a challenging topic in the chemosensing field. Herein, we focus on constructing the Hg( ii )-sensitive fluorescence “turn-on”-type composite materials by using halloysite nanotube (HNT) as substrate. Two types of HNTs-based chemosensors, HNTs-PHT and HNTs-BP, were developed in this study, which exhibit Hg( ii )-sensitive fluorescence “turn on” behavior by forming interparticle and intraparticle excimers, respectively. Fortunately, HNTs-PHT is able to effectively restrict the solvent relaxation of π–π* transition and make it a better detection tool in aqueous solution than HNTs-BP. The addition of Hg( ii ) can trigger a dramatical increase at 469 nm in emission curves of HNTs-PHT, which cannot exhibit emission behaviors without the addition of Hg( ii ). Furthermore, the formation of interparticle excimers makes Hg( ii ) serve as a crosslinker to aggregate HNTs-PHT into precipitations. Following this way, Hg( ii ) ions can be facilely removed from the water via a simple filtration or centrifugation approach. The as-prepared HNTs-PHT shows high specificity and precision in simultaneously detecting and separating Hg( ii ) without the recourse to energy consumption, which will give a novel insight to deal with heavy metal pollution.
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Small
·
2024
·Vol. 21
·期 1
·2408485
·
IF 13
Lin-Tao Jiang,Yi-Bing Huang,Shao-Min Pei,Xiao-Ming Jiang,Bin-Wen Liu,Guo-Cong Guo
The trigonal planar unit possesses significant hyperpolarizability and polarizability anisotropy, which makes it useful for optimizing nonlinear optical (NLO) materials, however, chalcogenide with this unit has seldom been reported. In this work, a novel approach is introduced by integrating the unprecedented trigonal planar MS 3 (M = Cd/In, Hg/In) motifs into the nearly optically isotropic tetrahedral units, resulting in two novel chalcogenides CsM 2 In 2 S 6 (M = Cd/In, 1 ; Hg/In, 2 ). Notably, structures 1 and 2 feature nearly planar triangular units at the center, encircled by three trimers, further interconnecting each other to create 3D frameworks. Importantly, phases 1 and 2 display phase-matching (PM) capabilities, primarily attributed to incorporating trigonal planar MS 3 units that additionally enhance polarizability anisotropy. Furthermore, compounds 1 and 2 demonstrate moderate second-harmonic generation (SHG) signals (0.70 and 0.84 × AgGaS2@1.7 µm). This study pioneers an efficient strategy for the design of infrared NLO crystals with PM capabilities.
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Journal of Environmental Chemical Engineering
·
2026
·
IF 7.2
Ning Wang,Penggang Pei,Ge Gao,Yundi Kan,Linna Zhou,Bozhen Yu,Yuebing Sun
Thiol–functionalized montmorillonite, characterized by its high–density adsorption sites, has demonstrated excellent application performance in Hg pollution control. However, the influence of aging on its structure and adsorption properties remains unclear. To comprehensively explore the structural characteristics and Hg adsorption capacity of thiol–functionalized montmorillonite after aging conditions, this study employed 1%–5% H₂O₂ chemical oxidation to simulate natural aging processes. Characterization results indicated that H₂O₂ treatment led to reductions in both the specific surface area and the interlayer spacing. Moreover, partial oxidation of –SH groups to –SO₃H was observed, along with an increase in acidic functional groups such as –COOH. Two–dimensional correlation spectroscopy (2D–COS) identified the functional groups aging sequence as follows: –OH (H₂O) > Si/Al–OH > Si–O–Si > –SH > –CH₂ – > –SO₃H. Adsorption capacities for Hg(II) and MeHg decreased from 103.03 to 44.87 mg/g, and from 39.50 to 16.87 mg/g, respectively. In parallel, the desorption rate increased from 11.25% to 39.12%. Density functional theory (DFT) calculations further confirmed an increase in the adsorption energy of the aging materials and verified that –SH groups possess the strongest binding ability toward Hg species.
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Zhen Huang,Minghu Zhao,Chen Wang,Shixing Wang,Linqing Dai,Libo Zhang
An outstanding metal–organic framework sorbent (Zn-MOF) was prepared using Zn2+ and 3-amino-5-mercapto-1,2,4-triazole to eliminate toxic metal ions from water. Zn-MOF was detected via using Fourier-transform infrared (FTIR) spectroscopy, field-emission scanning electron microscopy (FESEM), Brunauer–Emmett–Teller (BET) analysis, and X-ray photoelectron spectroscopy (XPS). Zn-MOF is stable and has a very large surface area. The uptake properties of Zn-MOF were investigated. The maximum uptake capacity of Zn-MOF for Pb, Hg, and As ions was 1097, 32, and 718 mg/g, respectively. This was obtained at pH = 4, 5, and 6, respectively. The adsorption data is in good agreement with the Langmuir and pseudo-second-order rate models, indicating that the uptake process of Zn-MOF for toxic metal ions was a single layer uptake on a uniform surface via exchange of valence electrons. Thermodynamics shows that the uptake process is autogenic and endothermic. Zn-MOF can be reused at least 6 times. Mercury and lead strongly coordinated with Zn-MOF. The interaction between arsenic and Zn-MOF is weak chemical coordination and ion exchange. Zn-MOF has wide application prospects for toxic metal ion elimination.
研究领域:
环境科学
·
材料化学
·
水净化
·
吸附技术
·
金属-有机框架（MOFs）
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Yunyun Li,Chang Lu,Nali Zhu,Jiang Chao,Wenjun Hu,Zhiyuan Zhang,Yongjie Wang,Lichun Liang,Jinkan Chen,Diandou Xu,Yuxi Gao,Jiating Zhao
Sulfur-fertilizer is commonly applied in croplands and in immobilizing Hg in contaminated soil. However, there is still great uncertainty and controversy concerning Hg transportability and transformation when supplying sulfur in paddies with complex conditions. Herein, we explored the effect of adding sulfate in paddy soil at different rice growth stages on soil Hg release and MeHg accumulation in rice and uncovered the correlation between sulfur induced MeHg production and the dynamically changed soil E h , dissolved Fe, and dissolved organic carbon (DOC). In specific, sulfate addition at early stages (flooding period) triggered the decrease of E h and increase of DOC and dissolved Fe, which in turn promoted Hg release and favored MeHg generation (increased by 235.19–555.07% vs control). Interestingly, adding sulfate at late stages (drainage condition), as compared with that at early stages, alleviated Hg release and MeHg production accompanied by the increase of E h and decrease of dissolved Fe and DOC. The microcosmic experiment further confirmed the reduction of sulfate to sulfide promoted the change of E h , thereby stimulating HgS dissolution in soil extract. The results give clues on the rational application of sulfur-fertilizer and through the water-sulfur fertilizer management considering the correspondingly changed soil conditions to diminish Hg bioavailability and MeHg production in paddies and paddy-like environments.
研究领域:
环境科学
·
土壤化学
·
农业管理
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污染控制
·
生物地球化学
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Libo Li,Wanlin Zhao,Jiayi Zhang,Lijun Luo,Xiaohong Liu,Xia Li,Tianyan You,Chunjiang Zhao
Herein, a label-free, self-enhanced electrochemiluminescence (ECL) sensing strategy for divalent mercury (Hg(II)) detection was presented. First, a novel self-enhanced ECL luminophore was prepared by combining the ECL reagent tris(2, 2′-bipyridyl) dichlororuthenium(II) hexahydrate (Ru(bpy) 3 2+ ) and its co-reactant carbon nitride quantum dots (CNQDs) via electrostatic interactions. In contrast to traditional ECL systems where the emitter and its co-reactant underwent an intermolecular reaction, the self-enhanced ECL system exhibited a shortened electron-transfer distance and enhanced luminous efficiency because the electrons transferred from CNQDs to oxidized Ru(bpy) 3 2+ via an intramolecular pathway. Furthermore, the as-prepared self-enhanced ECL material was encapsulated in silica (SiO 2 ) nanoparticles to generate a [email protected] 2 luminophore. Based on the different affinity of [email protected] 2 nanoparticles for single-stranded DNA (ssDNA) and Hg(II)-triggered double-stranded DNA (dsDNA), a label-free ECL biosensor for Hg(II) detection was developed as follows: in the absence of Hg(II), ssDNA was adsorbed on [email protected] 2 surface via hydrogen bond, electrostatic, and hydrophobic interaction. Thus, quenched ECL signal was observed. On the contrary, in the presence of Hg(II), stable dsDNA was formed and carried the ssDNA separating from [email protected] 2 surface, resulting in most of [email protected] 2 existing in their free state. Therefore, a recovered ECL intensity was obtained. On this basis, Hg(II) was measured by the proposed method in the range of 0.1 nM-10 μM, with a detection limit of 33 pM. Finally, Hg(II) spiked in water samples was measured to evaluate the practicality of the fabricated biosensor.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Baitong Niu,Biying Yao,Meihua Zhu,Hongxu Guo,Shaoming Ying,Zhangxu Chen
A fern leave-like structure metal-organic frameworks (MOFs), MIL-47(as) has been fabricated by a simple one-pot hydrothermal reaction and characterized by a variety of means, such as X-ray diffraction, Fourier transform infrared spectroscopy, micro-morphology analysis, X-ray photoelectron spectroscopy and specific surface area and pore size distribution. The as-prepared MOFs were found to be an effective material for the selective electrochemical detection of microgram levels of Pb(II), Cu(II) and Hg(II) in aqueous solution performed by differential pulse voltammetry. The electrochemical properties and applications of the modified electrode were also studied, in which operational parameters such as pH, deposition potential, and deposition time, were optimized to detect trace amounts of Pb(II), Cu(II) and Hg(II) ions. The as-prepared electrode not only has good stability and repeatability, but also has good practical detection ability.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-7
·
IF 5.479
Song Xiaolei,Wang Yu,Liu Su,Zhang Xue,Wang Haiwang,Wang Jingfeng,Huang Jiadong
A colorimetric biosensor and visual test is described for the determination of mercury(II). It relies on the specific thymine-Hg(II)-thymine (T-Hg 2+ -T) interaction which induces a cyclic amplification process (caused by the enzyme exonuclease III) and the aggregation of gold nanoparticles. These results in a color change from red to violet. Under optimized conditions, this colorimetric assay (best performed at 524 nm) has a detection limit as low as 0.9 nM with a detection range over 4 orders of magnitude (from 1 nM to 10 μM).
Schematic of a colorimetric method for determination of mercury ions (Hg 2+ ) based on the thymine-Hg 2+ -thymine interaction-triggered cyclic enzymatic amplification and aggregation of gold nanoparticles with the aid of exonuclease III (Exo III).
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Jia-Yi Zheng,Xue Jiang,Jian-Liang Zhou,Zi-Qi Shi,Li-Fang Liu,Gui-Zhong Xin
With the rapid development of immunometabolism , 2-hydroxyglutarate (2-HG) is being promoted as a key immunometabolite to regulate the immune system. Based on the well-established crosstalk between 2-HG and other immunometabolites, here we firstly constructed a 2-HG metabolic panel by mapping the related metabolic pathways. Quantitative methods to globally monitor 2-HG metabolic panel are of great importance for immunometabolism study. However, the existence of enantiomer hampers the accurate measurement of these immunometabolites. This study addressed an original isotopically-paired chiral derivatization approach for UPLC-MS/MS quantification of 2-HG metabolic panel. To achieve better chromatographic separation, N-(p-toluenesulfonyl)-L-phenylalanyl chloride (TSPC) was utilized as an optical resolving reagent to form diastereomers . For accurate quantitation, an 18 O 2 -labeled-TSPC reagent was designed and readily synthesized to produce one-to-one internal standards. The developed approach enabled an accurate quantification of 13 immunometabolites in 2-HG metabolic panel with good linearity (R 2 > 0.99) and high sensitivity (0.5–120 fmol for LLOQ). With this method, we were able to simultaneously monitor the specific alterations of 2-HG metabolic panel in collagen-induced rheumatoid arthritis (CIA) rats. The measured levels of this panel ranged from 0.02 to 85.14 μg g −1 for synovium tissue and 0.012 to 87.75 μmol L −1 for serum samples. We envisage that the present isotopically-paired chiral derivatization approach will be practicable for different bio-samples to quantitatively profile the amino- and hydroxyl acids submetabolome, especially for the endogenous enantiomers. By virtue of the low cost of reagents and the simple procedure used in the assay, this method could be readily implemented.
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LUMINESCENCE
·
2016
·Vol. 32
·期 2
·231-239
·
IF 1.452
Lu Lai,Si-Yu Sheng,Ping Mei,Yi Liu,Qing-Lian Guo
High-quality Cd x Zn 1 – x Se and Cd x Zn 1 – x Se/ZnS core/shell quantum dots (QDs) emitting in the violet–green spectral range have been successfully prepared using hydrothermal methods. The obtained aqueous Cd x Zn 1 – x Se and Cd x Zn 1 – x Se/ZnS QDs exhibit a tunable photoluminescence (PL) emission (from 433.5 nm to 501.2 nm) and a favorable narrow photoluminescence bandwidth [full width at half maximum (FWHM): 30–42 nm]. After coating with a ZnS shell, the quantum yield increases from 40.2% to 48.1%. These Cd x Zn 1 – x Se and Cd x Zn 1 – x Se/ZnS QDs were characterized by transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared (FTIR) spectroscopy. To further understand the alloying mechanism, the growth kinetics of Cd x Zn 1 – x Se were investigated through measuring the fluorescence spectra and X-ray diffraction spectra at different growth intervals. The results demonstrate that the inverted ZnSe/CdSe core/shell structure is formed initially after the injection of Cd 2 + . With further heating, the core/shell structured ZnSe/CdSe is transformed into alloyed Cd x Zn 1 – x Se QDs with the diffusion of Cd 2 + into ZnSe matrices. With increasing the reaction temperature from 100 °C to 180 °C, the duration time of the alloying process decreases from 210 min to 20 min. In addition, the cytotoxicity of Cd x Zn 1 – x Se and Cd x Zn 1 – x Se/ZnS QDs were investigated. The results indicate that the as-prepared Cd x Zn 1 – x Se/ZnS QDs have low cytotoxicity, which makes them a promising probe for cell imaging. Finally, the as-prepared Cd x Zn 1 – x Se/ZnS QDs were utilized to ultrasensitively and selectively detect Hg 2 + ions with a low detection limit (1.8 nM).
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COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 292
·期 9
·2157-2172
·
IF 2.41
Chen Xing Juan,Cai Jian Chong,Zhang Zheng Han,Liu Li Jia,Yang Guang Lei
A novel cross-linked chitosan-poly(aspartic acid) chelating resin was synthesized by combining chitosan and poly(aspartic acid) derivative with crosslinker. The structure and morphology of the resin containing disulfide bonds were characterized by 1 H NMR, FT-IR, Raman spectra, and SEM. Adsorption of Pb(II) and Hg(II) from aqueous solution by the resulted chelating resin was investigated in batch techniques. The result of the Raman spectra suggests that the disulfide bonds in the resin also play an important role in the adsorption of Pb(II) and Hg(II). The kinetic data were fitted to pseudo-first-order, pseudo-second-order, and intraparticle diffusion models, which is suggestive of following closely the pseudo-second-order kinetic model. Equilibrium data were fitted to Langmuir, Freundlich, and D–R isotherm models. The results of equilibrium isotherm reveal that the empirical Langmuir equation provides an accurate description of the experimental data under the studied concentration range. In addition, thermodynamic and regeneration properties of the adsorbent were also studied.
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MOLECULES
·
2025
·Vol. 30
·期 5
·1078
·
IF 4.6
Jiapeng Li,Lili Chen,Yiming Qiao,Li Li,Xin Li,Linbo Deng,Xuemin Duan,Hui Chen,Yansha Gao
Heavy metal pollution has posed a serious threat to the ecological environment and human health. Thus, the development of accurate and effective methods for their detection is crucial. In this study, a novel electrochemical sensor was fabricated to detect Cu2+and Hg2+, based on N-doped carbon nanotube-wrapped Ni nanoparticle (Ni@N-CNT) sensing material, which was derived from the pyrolysis of Ni2+doped ZIF-8. For electrode material design, the packaging structure not only protected the encapsulated Ni nanoparticles from electrochemical corrosion in the acid electrolyte but also provided excellent electro-catalytic activity and electrical conductivity by controlling their size. Thanks to the overall performance of the Ni@N-CNT composite, the proposed sensor exhibited excellent analytical performance for Cu2+and Hg2+detection, with ultra-low detection limits of 33.3 ng⋅L−1and 33.3 ng⋅L−1, respectively. The sensor also demonstrated good repeatability, reproducibility and selectivity. In addition, the method was successfully applied to the electrochemical analysis of Cu2+and Hg2+in actual Chinese cabbage samples with satisfactory recovery, confirming its practical applicability.
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