MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 6
·1-10
·
IF 5.479
Li Bo,Ma Hong,Zhang Bo,Qian Jing,Cao Ting,Feng Haitao,Li Wu,Dong Yaping,Qin Wenwu
The authors describe the preparation of carbon dots (CDs) that display both blue (~ 410 nm) and yellow (~ 565 nm) emission peaks. The CDs was synthesized by solvothermal treatment of o-phenylenediamine in aqueous ethyl alcohol at pH ~7.0. The CDs are shown to be useful fluorescent probes for pH values in that the ratio of fluorescences at 565 and 410 nm strongly depends on the pH value in the range from 4.5–6.5 and 10.0–13.0, respectively. The blue fluorescence is quenched by 91% by 100 µM solutions of Hg(II) through an electron transfer process, and is restored by 97% an addition of chloride (0.5 mM). The yellow fluorescence, in contrast, is hardly affected. The ratio of fluorescences at 414 and 565 nm drops linearly in the 30 to 60 μM of Hg(II) concentration range, and the limit of detection is 60 nM. Fluorescence is linearly restored in the 70 to 180 μM chloride concentration range, and the LOD is 2.8 nM. Both the blue and the yellow emission are reduced by Cr(VI) (chromate) due to an inner filter effect at pH 3.0. The ratio of fluorescences (410/565 nm) drops linearly in the 20 to 250 μM Cr(VI) concentration range, and the LOD is 260 nM. The method was utilized to analysis of chloride in salt lake brine and of Cr(VI) in spiked tap water.
Schematic presentation of carbon dots with pH-dependent dual emission (at ~ 410 nm and ~ 565 nm). They are shown to be viable fluorescent probes for ratiometric sensing of pH values, mercury(II), chloride and Cr(VI) via different mechanisms.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
Journal of Environmental Sciences
·
2017
·
IF 2.865
Yingjie Li,Wenfeng Li,Qingnan Liu,Hong Meng,Yingzhou Lu,Chunxi Li
For the first time, a series of alkynyl carbon materials (ACMs) were prepared via the mechanochemical reaction of CaC 2 with six polyhalogenated precursors, namely CCl 4 , C 2 Cl 6 , C 2 Cl 4 , C 6 Cl 6 , C 6 Br 6 , and C 14 H 4 Br 10 (ACM-1, ACM-2, ACM-3, ACM-4, ACM-5, and ACM-6, respectively) and used for the adsorptive removal of mercury from aqueous solutions. Based on preliminary investigations, the adsorption of mercury on ACM-5 was studied in depth. Specifically, the effect of pH on mercury adsorptivity , adsorption kinetics, thermodynamics, isotherms, and recyclability was studied. The adsorptivity of mercury on ACMs was found to be closely related to the hydrocarbon precursor, specific surface area of sorbent , and the alkynyl content. ACM-5 showed the best performance and is among the best raw carbonaceous sorbents reported so far, with a Langmuir saturated adsorption capacity of 191.9 mg g − 1 . The promising mercury adsorption performance mainly arises from the strong Lewis soft acid–soft base interactions between the alkynyl groups and mercury ions. The adsorption isotherms could be satisfactorily correlated with the Langmuir equation. The results show that the ACMs can be used as efficient sorbents for the removal of mercury and may also be useful for the adsorption of other heavy metals.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
·
IF 5.3
Ke Liu,Shidong Liu,Qin Shuai,Lijin Huang
Mercury (Hg(Ⅱ)) is an extremely hazardous heavy metal ubiquitously discovered in the global environment. Covalent organic polymers (COPs) have been recognized as promising adsorbents due to their exceptional properties tailored for Hg(II) sequestration. Nevertheless, the synthesis of the majority of COPs requires rigorous experimental conditions. Herein, a sulfur (S)-rich COP denoted as TpTU was successfully constructed using a solvent-free approach. Compared to TpUrea without S, TpTU exhibited superior Hg(Ⅱ) capture performance. The experimental results demonstrated splendid adsorption performance for Hg(Ⅱ) (187 mg·g −1 ), and the adsorption isotherm was well-fitted to the Freundlich model (R 2 > 0.98). Meanwhile, adsorption equilibrium was achieved within 5 min, and thermodynamic analyses indicate that the adsorption process is endothermic in nature. In addition, TpTU exhibited exceptional selectivity for Hg(II) even in the presence of competing ions. The mechanism investment revealed that the incorporation of heteroatoms, particularly S and nitrogen (N), plays a critical role in enhancing the affinity of COP toward Hg(Ⅱ). Moreover, no significant loss is observed for its capacity even after eighth adsorption–desorption cycles, demonstrating remarkable reusability of TpTU. Furthermore, TpTU also achieved Hg(Ⅱ) removal efficiency of over 98.9 % in actual water samples. These results prove the practical potential of TpTU for the purification of Hg(II) polluted water, offering a promising avenue towards cleaner and safer water resources.
研究领域:
环境科学
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材料科学
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高影响因子
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).
研究领域:
分析化学
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环境科学
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纳米技术
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 4
·1-8
·
IF 5.479
Jin Huali,Zhang Mingli,Wei Min,Cheng Jun-Hu
The presented voltammetric mercury(II) sensor is based on the specific interaction between Hg(II) ion and thymine-thymine base pairs. Reduced graphene oxide is functionalized with gold nanorods and then loaded with thionine and streptavidin (RGO@AuNR-TH-SA). A T-rich thiolated DNA (S1) is firstly immobilized on a gold electrode. In the presence of Hg (II), the T-rich biotin-DNA (biotin-S2) binds to S1 via T-Hg(II)-T interaction. Then, the RGO@AuNR-TH-SA is linked to the gold electrode by specific binding between SA and biotin-S2. This produces an electrochemical signal (at −0.208 V vs. Ag/AgCl) of TH that depends on the concentration of Hg (II). The peak current increases linearly in the 1 to 200 nM Hg (II) concentration range, and the detection limit is 0.24 nM. The sensor is highly selective for Hg (II) over other environmentally relevant metal ions, even at concentration ratios of >1000.
Schematic representation of a voltammetric biosensor for mercury(II) using reduced graphene oxide@gold nanorods (RGO@AuNRs) and thymine-Hg(II)-thymine interaction. It is based on the fact that RGO@AuNR can strongly adsorb thionine (TH) and streptavidin to realize the signal amplification.
研究领域:
分析化学
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环境科学
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纳米技术
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生物传感器
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2023
·
IF 3.9
Huizhen Sun,Yi Li,Xiumin Chen,Xiuhua Chen,Shaoyuan Li,Wenhui Ma,Kaixin Fu
The recycling of diamond wire cutting silicon waste (DWCSW) and the removal of heavy metal ions are very important for human life. Therefore, it is a promising method to improve the selective removal of heavy metal ions by etching and modifying organic functional groups for DWCSW. In this study, a new adsorbent PA-TEPA-GTS-NPSi was synthesized by Cu-assisted chemical etching and modified with 3-glycine dioxy-propyl trimethoxy-silane (3-GTS), tetraethylpentenediamine (TEPA) and hypophosphorous acid (H 3 PO 2 ) for selective adsorption Hg(Ⅱ). PA-TEPA-GTS-NPSi showed excellent adsorption performance on Hg(Ⅱ), with adsorption capacity of 112.8 mg/g (pH=2.0, adsorption time=120 min). The pseudo-second-order model and Langmuir model can better describe the adsorption process , which proving that the adsorption process is chemisorption . The adsorption mechanism of Hg(Ⅱ) was studied by X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT). It was proved that the adsorption process was mainly caused by the strong adsorption between P and Hg(Ⅱ) in the phosphorus groups on the surface of PA-TEPA-GTS-NPSi adsorbent. Compared with other hypophosphorous acid functionalized adsorbents, the adsorption performance of the adsorbent is at a medium level, but it can effectively recycle DWCSW while removing heavy metal ions.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
FOOD CHEMISTRY
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2020
·
IF 6.306
Xie He,Yong Han,Xueli Luo,Weixia Yang,Chunhua Li,Wenzhi Tang,Tianli Yue,Zhonghong Li
A ratiometric fluorescence (FL) sensor was fabricated by coordinating 2, 6-pyridinedicarboxylic acid (DPA) sensitized Tb 3+ (Tb-DPA) with NH 2 and COOH on the surface of the N -doped carbon dots ( N -CDs) for detecting Hg 2+ in seafood. The sensor exhibited two FL emissions at 436 nm ( N -CDs) as the response signal and at 543 nm (Tb-DPA) as the reference signal when excited at 290 nm. After adding Hg 2+ , the FL emission at 436 nm was significantly quenched and the FL emission at 543 nm was negligibly changed. The electron transfer (ET) between COO − of N -CDs and Hg 2+ led to the FL quenching of N -CDs. The FL ratio (F 436 /F 543 ) exhibited a good linear relationship in the Hg 2+ concentrations of 1 161.51 μM with a low limit of detection (LOD) of ~37 nM. The sensor presented high selectivity, satisfactory accuracy and precision toward Hg 2+ in seafood with recoveries of 86.45–114.47% and RSDs of 0.20–1.92%.
研究领域:
分析化学
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环境科学
·
食品科学
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DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Guo Lin,Tu Hu,Shixing Wang,Tingfang Xie,Libo Zhang,Song Cheng,Likang Fu,Chao Xiong
Removal of Hg(II) from wastewater was beneficial to satisfy the discharge standards of China's mercury-containing wastewater (50 ppb). An adsorbent was prepared via modifying corn husk leaves with bismuthiol I. The results revealed that the mercury removal rate was more than 98.5% at pH 1.0–7.0. Moreover, the removal rate reached 96% at 5 min and the residual concentration decreased from 10 ppm to approximately 30 ppb. In addition, the adsorbent owned a conspicuous selective absorbability for trace Hg(II) from wastewater. The adsorption process followed a Hill isotherm model. The actual saturated adsorption quantity of the adsorbent was 707 mg/g. The repeatability experiment indicated that the mercury removal efficiency was still beyond 99% after three cycles. The X-ray photoelectron spectroscopy suggested that the main adsorption mechanism was chelation between nitrogen/sulfur groups and Hg(II). The adsorbent was hopeful to remove mercury from wastewater in a sustainability perspective.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 184
·期 2
·541-546
·
IF 4.831
Zhang Ruoxi,Deng Li,Zhu Paijin,Xu Shuxia,Huang Chengpeng,Zeng Ying,Ni Shijun,Zhang Xinfeng
The article describes a bienzyme visual system for aptamer-based assay of Hg(II) at nanomolar levels. The detection scheme is based on the finding that Hg(II) ions captured by aptamer-functionalized magnetic beads are capable of inhibiting the enzymatic activity of uricase and thus affect the formation of H 2 O 2 and the blue product, i.e., oxidized tetramethylbenzidine. This strategy allows for a visual detection of Hg(II) at nanomolar levels without additional amplification procedure. Measuring the absorbance at 650 nm, the logarithmic calibration plot is linear in the concentration range of 0.5–50 nM and the limit of detection (LOD) is 0.15 nM. This is as low as the LOD obtained by atomic fluorescence spectrometry (AFS). The ions K + , Mg 2+ , Na + , Ca 2+ , Cu 2+ , Zn 2+ , Fe 3+ , Al 3+ , Co 2+ , AsO 2
− , Ni 2+ , Cd 2+ and Pb 2+ do not have a significant effect on color formation. The method was applied to the analysis of (spiked) river water, lake water, mineral water, tap water and certified reference water samples, and the results agreed well with those obtained by AFS or certified values, with recoveries ranging from 97% to 109%. The relative standard deviation for five parallel detections at a 10 nM Hg(II) level is 5.2%.
A bienzyme-based visual aptasensor was fabricated for label-free detection of nanomolar Hg 2+ in water samples without any amplification or enrichment procedure.
研究领域:
分析化学
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环境科学
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生物技术
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Xinrong Liao,Guoqiang Yu,Ruiqing Luo,Qiang Wang,Chiyang He,Shaorong Liu
Simultaneously capturing organic pollutants and heavy metal can greatly reduce the water remediation time and cost, however it is still a great challenge presently. Herein, two novel thiol/methylthio–functionalized porous aromatic frameworks were synthesized as sorbents via the Sonogashira–Hagihara reaction of 1,3,5–triethynylbenzene and 1,3,5–tris(4–bromophenyl) benzene, the subsequent chloromethylation of the phenyl rings, and the final nucleophile substitution of –Cl groups by NaSH/NaSMe. These two sorbents were characterized by FT–IR spectra, energy dispersive X-ray spectra, scanning electron microscope , nitrogen adsorption analysis, thermo–gravimetric analysis, and elemental analyses. Adsorption experiments displayed that new sorbents had high uptake abilities and fast adsorption kinetics for aromatic pollutants and mercury (II) (Hg(II)). The maximum adsorption capacity ( Q max ) of toluene and m –xylene on both new sorbents were 531.9–571.4 mg/g with the kinetic binding rate constants ( k obs ) of 0.00276–0.02422 g/mg/min, and the Q max values of Hg(II) were 148.1–180.3 mg/g with k obs of 0.00592–0.01573 g/mg/min. Moreover, new sorbents indicated high simultaneous uptake abilities for these pollutants with good reusability, and finally they were successfully applied to the simultaneous remediation of these pollutants in two simulated sewages with high and low concentration, indicating their great practical application potential in wastewater remediation.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2010
·
IF 3.083
Jingming Gong,Ting Zhou,Dandan Song,Lizhi Zhang
We demonstrate a new highly sensitive and selective Hg(II) sensor with a graphene-based nanocomposite film as the enhanced sensing platform. The platform was constructed by homogenously distributing monodispersed Au nanoparticles (AuNPs) onto the two-dimensional (2D) graphene nanosheet matrix. Its surface structure and electrochemical performance were systematically investigated. Such a nanostructured composite film platform could combine with the advantages of AuNPs and graphene nanosheets, greatly facilitate electron-transfer processes and the sensing behavior for Hg(II) detection, leading to a remarkably improved sensitivity and selectivity. The detection limit was found to be as low as 6 ppt ( S / N = 3), much below the guideline value from the World Health Organization (WHO). The interference from other heavy metal ions such as Cu 2+ , Cr 3+ , Co 2+ , Fe 3+ , Zn 2+ and I − ions associated with mercury analysis could be effectively inhibited. The performance of new sensor was also evaluated by the direct detection of Hg(II) in river water specimens, suggesting it is very promising for practical environmental monitoring applications.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 30
·18466-18479
·
IF 3.108
Chao Zhou,He Zhu,Qin Wang,Junxiu Wang,Juan Cheng,Yongfu Guo,Xiaoji Zhou,Renbi Bai
To enhance the ability to remove mercury(II) from aqueous media, an Fe3O4 magnetic nanocomposite (PPy–GO) composed of polypyrrole (PPy) and graphene oxide (GO) was synthesized in situ and characterized via scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray photoelectron spectrometry (XPS), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), zeta potential analysis, vibrating sample magnetometer (VSM) and the Brunauer–Emmett–Teller (BET) method. The performance of the magnetic PPy–GO for adsorbing mercury(II) from water along with the effects of solution pH, adsorbent dosage, coexisting ions, reaction time and temperature were studied in detail. The adsorption kinetics, isotherms and thermodynamics were investigated in detail to gain insights into the adsorption process. The results show that the BET surface area of the magnetic PPy–GO reached 1737.6 m2 g−1. The Langmuir capacity of the magnetic PPy–GO for mercury(II) adsorption was 400.0 mg g−1 at 300 K and pH 7 ± 0.1. After adsorption, the magnetic PPy–GO nanocomposite could be efficiently separated from water via a magnetic field. The adsorption process was endothermic and spontaneous and occurred in accord with the Langmuir and pseudo-second-order models. The overall adsorption of mercury(II) not only involved chemisorption, but was also partially governed by intra-particle diffusion. Data from the preliminary application of magnetic PPy–GO to remove heavy metals from real electroplating effluent indicated a high removal efficiency of over 99% for mercury(II). Finally, a possible adsorption mechanism was discussed. All data showed that the magnetic PPy–GO material is a promising adsorbent to remove mercury(II) from aqueous media.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
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