CHEMICAL ENGINEERING JOURNAL
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2015
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IF 4.321
Sheng Deng,Guangshan Zhang,Xi Wang,Tong Zheng,Peng Wang
Polyacrylonitrile fiber immobilized with iminodiacetic acid (IDA) was prepared under microwave irradiation and was used to adsorb Cu(II) and Hg(II) in aqueous solution. Synthesis conditions such as time, temperature and ratio of solvents were exploited systematically by orthogonal experiment and the properties of this fibrous absorbent were characterized by fourier transform infrared spectroscopy (FT-IR), elemental analysis (EA), scanning electron microscopy (SEM). The adsorption performances, in both thermodynamic and kinetic conditions, were investigated strictly and the experimental data fitted the Langmuir model ( R 2 > 0.99) and pseudo-second-order equation very well. The effect of pH on the adsorption capacity of metal ions was discussed and the optimal value for Cu(II) and Hg(II) was found to be 5.0 and 2.0, respectively. Thermodynamic parameters reveal the spontaneous and endothermic nature of the adsorption process , due to the negative value of standard free energy (Δ G ) and the positive value of standard enthalpy (Δ H ). The adsorption capacities toward Cu(II) and Hg(II) on the modified polyacrylonitrile fibers under microwave irradiation are higher than those on other adsorbents through conventional heating. The less consumed time and high grafting rate of the functional groups may be attributed to thermal effect as well as non-thermal effect of microwave irradiation.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2014
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IF 3.84
Yutao Yang,Caixia Yin,Fangjun Huo,Jianbin Chao,Yongbin Zhang
A simple fluorescent probe, perylene-3,4,9,10-tetracarboxylic dianhydride, which is a commercially available organic pigment intermediate was reported as a fluorescence chemosensor for Hg(II). This probe can high selectively recognize hydrogen sulfide in water:DMSO (1:1 (v/v), 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) buffer, pH 7.4) solutions. Namely, with addition of various anions, only HS − can induce a turn on green fluorescence. The mechanism is that perylene-3,4,9,10-tetracarboxylic dianhydride was hydrolyzed and subsequently displaced when meeting with hydrogen sulfide. More interestingly, probe–hydrogen sulfide can successively detect Hg 2+ . The detection mechanism was based on Hg 2+ snatching up sulfur group of probe–HS − adduct, which makes the probe regenerative. And their reaction products were proved by ESI-MS. Their potential application in bioimaging was also illustrated.
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Analytical Methods
·
2015
·Vol. 7
·期 15
·6103-6108
·
IF 1.821
Yuling Hu,Dongmei Wang,Gongke Li
Inspired by the bioadhesive and redox properties of the 3,4-dihydroxy-phenylalanine (DOPA) contained in marine mussels, a facile, rapid and economic colorimetric strategy for Hg2+ detection was developed. The abundant catechol chains on the surface of Ag@DOPA can reduce Hg2+ to Hg0 and form a Ag@DOPA@Hg nanostructure with the deposition of Hg0. The nanostructures of Ag@DOPA and Ag@DOPA@Hg were confirmed by X-ray photoelectron spectroscopy, transmission electron microscopy, elemental mapping and Fourier transform infrared spectroscopy. The formation of the Ag@DOPA@Hg nanostructure causes a change in the color of the Ag@DOPA colloids from golden yellow to purple blue, making it directly possible to detect Hg2+ using a colorimetric strategy within 5 minutes. With increasing concentrations of Hg2+ from 10 nM to 4 μM, the surface plasmon resonance absorbance peak of the Ag@DOPA colloids decreased in intensity and exhibited a good linear relationship with the Hg2+ concentration. The limit of detection was determined as 5 nM. Furthermore, this response was found to be highly selective for Hg2+ as the absorption spectrum was not affected by other metal ions such as Pb2+, Cr3+, Cu2+, Al3+, Ni2+, Co2+, etc. The excellent stability, selectivity and sensitivity of this strategy offer analytical practicability for Hg2+ detection in real water samples with recoveries in the range of 104–105% and cosmetic samples with recoveries in the range of 85–103%.
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SEPARATION SCIENCE AND TECHNOLOGY
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2015
·
IF 1.171
Xiaosheng Tang,Jun Yao,Ping Tang
In this study, 3-mercaptopropyltriethoxysilane (MPTS) modified mesoporous silica based on multiwalled carbon nanotubes (MWCNTs@mSiO2-MPTS) was successfully prepared. The adsorption material was characterized and used for adsorbing Hg(II) ions from aqueous solution. The equilibrium data conformed better to the Langmuir isotherm with maximum adsorption capacity calculated 349.65 mg/g at 40ºC. The kinetics analysis revealed the adsorption process fitted well with the pseudo-second-order kinetic model. The thermodynamic parameters indicated the adsorption process was spontaneous and endothermic. All results obtained suggested that MWCNTs@mSiO2-MPTS may be employed as an efficient material for the adsorption or preconcentration of Hg(II) ions from aqueous solution.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
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IF 3.012
Yinxiu Zuo,Jingkun Xu,Fengxing Jiang,Xuemin Duan,Limin Lu,Guo Ye,Changcun Li,Yongfang Yu
Gold nanoparticles (AuNPs) dotted S-doped carbon (AuNPs/S-C) nanoflakes were synthesized via a facial and simple approach. Typical synthesis route involves the formation of gold nanoparticles/poly(3,4-ethylenedioxythiophene) (AuNPs/PEDOT) and a subsequent calcination process. Many techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) were used to characterize their morphology, structures and compositions . Results indicated that AuNPs with an average size of 5 nm were uniformly dotted on/into the S-C nanoflakes. The AuNPs/S-C/nafion was utilized as a new electrode material for simultaneously electrochemical determination of Cu (II) and Hg (II) using differential pulse anodic stripping voltammetry (DPASV) technique. Benefiting from the efficient metal-complexing ability and electrocatalytic activity of S-C and the good conductivity of AuNPs, the modified electrode exhibited enhanced electrochemical performance compared with bare glassy carbon electrode. Under optimal conditions, the peak currents displayed linear response to the concentrations of Cu (II) and Hg (II) ranges from 0.64 to 63.55 μg/L and 4.01 to 300.89 μg/L, with detection limits of 0.19 μg/L and 1.40 μg/L (S/N = 3), respectively. The modified electrode was also applied for the determination of Cu (II) and Hg (II) in lake water samples with good results.
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DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Xirui Miao,Junmei Liu,Haichao Li,Chunying Tao,Yu Zhang,Xudong Yang
Mercury ion (Hg(II)) is one of the most toxic heavy metals in the environment and has seriously damaged human health. Based on this, we designed a novel fluorescence-enhanced carbon dots/mesoporous silica fluorescent composite (CDs/MSNs) fluorescent composite sensor for rapid and sensitive detection of Hg(II) in environmental and biological systems. Carbon dots (CDs) are one of the most promising carbon-based nanomaterials of the new generation, and we chose them as template molecules, and CDs were embedded in mesoporous silica nanospheres (MSNs) by hydrothermal method to form CDs/MSNs fluorescent composite with aggregation-induced emission enhancement (AIEE). Notably, the CDs/MSNs fluorescent composite has a yellow luminescence with a photoluminescence intensity several times higher than the original one, and have high stability, excellent selectivity, and good biocompatibility, which can realize the selective and sensitive detection of Hg(II) in the environment, with a limit of detection as low as 0.89 μM. The material can also be used as an effective luminescent biological probe for the detection of Hg(II) in cells. and these properties provide long-term practical applications of CDs/MSNs fluorescent composite in the fields of biological detection.
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JOURNAL OF HAZARDOUS MATERIALS
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2025
·
IF 11.3
Pingxiu Zeng,Hongmei Hu,Yuanchao Wang,Jinhua Liu,Heyong Cheng
Aquaculture organisms may accumulate metals to induce health risks. Compared with the focus on total contents, chemical-specific risk assessment makes reasonable but is rare. Herein, we elucidated occurrence of twelve metal compounds in shrimp and fish (edible muscle, one of major metal-containing and generally targeted organs), water, sediment, and feedstuff from two aquaculture ponds in Zhejiang Province (one of the major aquatic production and consumption areas). We detected Cd(II) (0.6 −71.4 μg kg –1 in 100 % prawn but 63 % fish), methylmercury (MeHg, 0.5 −7.1 μg kg –1 in 100 % fish but 61 % shrimp), Pb(II) (0.4 −1.0 μg kg –1 in 57 % fish and 39 % prawn), and trimethyltin and triethyltin (0.4 −0.7 μg kg –1 ), which were much lower than the maximum limits in China. Pb(II), Cd(II), and Hg(II) up to 0.38 mg kg –1 were main contaminants in sediment while Cd(II) and Pb(II) up to 0.44 mg kg –1 were major contaminants in feedstuff compared with Cd(II), Sn(II), Hg(II), and Pb(II) majored in water at ng L –1 levels. Ecological risks were low in water but high for tributyltin in sediment. Additionally, light bioaccumulation of Cd(II) from sediment for prawn and methylmercury from feedstuff/sediment for crucian and bighead carp was induced. We also found light health risk of triethyl- and trimethyl lead, and Cd(II) (to children) associated with fish/shrimp consumption (edible muscle). This study proved high necessity of chemical-specific assessment, and shall trigger increasing interest to more metallic compounds in a wide range of uncultured and cultured plants and animals.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Donglei Wei,Xiaoxia Liu,Zichen Wu,Hou Chen,Liangjiu Bai,Huawei Yang,Lixia Yang,Wenxiang Wang,Xiaofeng Zhang,Junling Wang
Cellulose-based polymer brush-on-brush composite adsorbent is prepared under simple and mild conditions via a four-step two sequential organophotocatalyzed atom transfer radical polymerization for the efficient removal of Hg(II) from aqueous media. The defined structure of the cellulose-based composites was supported by the characterization results. Influences of solution pH, temperature and adsorbent dosage on the adsorption behavior of the adsorbent were determined by batch experiments. The adsorption performance of the polymer brush composite intermediate was also investigated as a comparison to the final adsorbent to illustrate the significance of the topological surface structure on adsorption efficiency and capacity. Adsorption kinetics, isotherm and mechanism were studied systematically to further clarify the adsorption process. In addition, the adsorbent exhibits good applicability as it can be reused for 5 times without obvious decrease in desorption rate (>90 %), which showed potential utility for preconcentration and recovery of aqueous Hg(II).
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PubMed
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JOURNAL OF FLUORESCENCE
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2025
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IF 3.1
Yao Jie,Chen Hongfang,Yang Xiaohua,Iqbal Muzaffar,Bian Wei
Mercury ions (Hg 2+ ) are categorized as environmental pollutants, which distributed in water, soil, and food systems due to environmental contamination. Hence, designing a sensitive assay for the convenient determination of Hg 2+ is of great importance. Herein, S and O-doped graphite phase nitrogenized carbon quantum dots (S, O-C 3 N 4 QDs) was encapsulated within a europium -based metal-organic framework (Eu-MOF) to construct a novel ratiometric fluorescent nanoprobe for the quantitative detection of Hg 2+ . The native emission of S, O-C 3 N 4 QDs at 445 nm is used as a response signal, while Eu-MOF with fluorescence offers a reference signal at 619 nm. Hg 2+ exhibits high affinity for the surface functional groups of S/O-C 3 N 4 QDs, forming non-fluorescent chelation complexes that induce static quenching. This results in significant attenuation of the fluorescence intensity at 445 nm, while the emission at 619 nm remains invariant. A ratiometric fluorescence sensing platform was established based on the intensity ratio (F 445 /F 619 ) for the selective detection of Hg 2+ . The linear range of S, O-C 3 N 4 QDs/Eu-MOF of Hg 2+ was 0.25–35 µM and with a detection limit of 4.3 nM. The satisfying results demonstrate the effectiveness of the developed S, O-C 3 N 4 QDs/Eu-MOF-based fluorescence probe for Hg 2+ detection, highlighting its promising potential for environmental monitoring applications.
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TALANTA
·
2021
·
IF 6.057
Wenjia Li,Dong Liu,Daming Dong,Tianyan You
The rapid and sensitive detection of Hg 2+ is highly required to protect the environmental safety and human healthy. In the present work, a ratiometric fluorescent sensing platform, consisting of silicon quantum dots (SiQDs), Rox-labelled DNA (Rox-DNA), and Exonuclease III (Exo III), is developed for the accurate detection of Hg 2+ . As for fluorescent probe , we report the first use of glutathione as reduction reagent for the microwave synthesis of SiQDs, achieving the facile (using a house-hold microwave oven) and rapid (within 8 min) synthesis. Such SiQDs show pH-independent spectra and reversible fluorescent behavior with temperature. Moreover, experimental results revealed that the electrostatic interaction-induced aggregation of Rox-DNA and SiQDs facilitated the occurring of energy transfer (ET). And detection principle based on the regulation of ET between Rox and SiQDs with Exo III was designed for analysis. ET effect resulted in the fluorescent fading of Rox while that of SiQDs kept stable. For analysis, the addition of Hg 2+ led to the formation of double-stranded Rox-DNA via T-Hg 2+ -T. Exo III would cut these double-stranded DNA to release Rox and Hg 2+ , thereby impeding the ET effect and recovering the fluorescent of Rox. Such SiQDs/Rox-DNA/Exo III ratiometric fluorescent sensing platform exhibited a linear response concentration range of 0.02 nM–10 nM with a detection limit of 0.01 nM. It was successfully used to analyze the water and soil samples. The reliability was validated by ICP-MS. Our work should promote the practical application of ratiometric fluorescent assay.
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PubMed
高影响因子
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
·
2021
·
IF 3.752
Yujie Chen,Man He,Beibei Chen,Bin Hu
A novel thiol-grafted magnetic polymer (MPPs-SH) was synthesized by “click reaction” between 1,2-ethanedithiol and Fe 3 O 4 @SiO 2 @poly (ethylene glycol dimethacrylate -co- glycidyl methacrylate). The resultant MPPs-SH had high S content (5.4 wt%) and exhibited large specific surface area (156.8 m 2 g −1 ) as well as high adsorption capacity of 254, 64.2, 56.6 mg g −1 for mercury, cadmium and lead ions , respectively. With the prepared MPPs-SH as sorbent , a method of magnetic solid phase extraction combined with inductively coupled plasma mass spectrometry was developed for the quantification of trace mercury, cadmium and lead in environmental water samples. The extraction conditions including sample pH, sample volume, sorbent amount, adsorption/desorption time and elution volume were optimized. Under the optimal conditions, three heavy metal ions were extracted from 150 mL aqueous solution in 10 min and eluted by 0.2 mol L −1 HNO 3 containing 2% thiourea in 5 min. The method presented low limits of detection (0.21, 0.82 and 2.9 ng L −1 ) for target ions. The accuracy of the method was validated by using Certified Reference Materials of Environmental Water including GSB 07–1185–2000 (201435), GSB 07–1183–2000 (201239) and GSB 07–3173–2014 (202046). The application potential was further validated by the determination of trace mercury, cadmium and lead in Yangtze river and East lake water samples. The content of target heavy metal ions in tested water sample was found to be in the range of 6.40–195 ng L −1 , and the recoveries of 86.4–109% were obtained at three spiking concentration levels for mercury, cadmium and lead ions.
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Toxics
·
2026
·Vol. 14
·期 10
·914
·
IF 4.9
Jiajun Feng,Qimiao Huang,Junyuan Liang,Yuyuan Chen,Qiuhua Huang,Zihong Jiang,Peixuan Chen,Jian Kang,Xiang Li
Red inorganic pigments traditionally rely on Pb-, Cd-, Hg-, or Cr(VI)-based colourants that carry avoidable hazard and exposure risks. Here, a family of Sr6YAl1−xFex(BO3)6(0 ≤ x ≤ 1) pigments was prepared by solid-state reaction using Fe3+as the chromophore and no Pb-, Cd-, Hg-, Cr(VI)-, or As-containing precursors. X-ray diffraction shows that the trigonal Sr6YAl(BO3)6-type framework (space group R-3) is retained as a single phase throughout the series; on the basis of isovalent charge, six-coordinate geometry and matched ionic radii, Fe3+substitutes for octahedral Al3+to form a continuous solid solution, and SEM-EDS mapping confirms a broadly homogeneous, single-phase Fe-containing borate. Increasing Fe content strengthens visible absorption and moves the colour from white to a light reddish-orange (warm tan), with the x = 1 end member givingL* = 69.69,a* = 10.08,b* = 12.79 andC* = 16.28. The colour is essentially unchanged in water and dilute acetic acid, shows a moderate shift in alkaline media (ΔE* = 8.05–10.21), and changes markedly only in 0.1 mol L−1HCl (ΔE* = 15.07). Elemental release was screened by immersing 1.00 g of powder in 50 mL of water (H1), 0.01 mol L−1acetic acid (H2) or 0.1 mol L−1HCl (H3) for 24 h at room temperature, with each leachate read three times by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). Water and dilute acid gave similar, modest release, whereas HCl mobilized substantial B, Sr and Y (530.72, 4639.42 and 470.54 mg L−1, i.e., up to 41.87%, 45.15% and 27.08% of the nominal inventory) but very little Fe (0.156 mg L−1, only ≈0.014% of the Fe inventory, and below detection in H1 and H2). The Fe chromophore is thus effectively immobilized even when the borate framework is attacked, decoupling colouration from chromophore leaching. The pigments demonstrate source-level elimination of regulated toxic metals together with strong chromophore retention; the non-standardized extraction provides a conservative release-potential screen rather than a regulatory compliance determination.
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