MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 10
·1-9
·
IF 6.232
Jiao Mingxia,Li Yun,Jia Yuxiu,Xu Le,Xu Guiyun,Guo Yingshu,Luo Xiliang
Water-soluble Cu nanoclusters (NCs) with tunable emission were synthesized through an eco-friendly one-pot aqueous method. Blue-, green-, and red-emitting NCs with the emission peaks at 420 nm, 505 nm, and 630 nm were obtained by employing ethanediamine, cysteine, and glutathione as surface ligands, respectively. The ligand effects on the optical properties of Cu NCs were studied by the single variable method. It has been revealed by systematic characterizations that the dependence of emission color on the structures of ligands was mainly attributed to their different size-tuning effects. Glutathione has the strongest chelating ability and it can significantly reduce the monomer reactivity and thus decrease the supersaturation degree of the reaction, which is favorable for modulating Cu precursor to grow into larger NCs. In contrast, ethanediamine ligand resulted in smaller nanoclusters due to its weaker binding capability. Because of the strong emission and terrific fluorescent stability, Cu NCs capped with ethanediamine, possessing an emission peak at 420 nm when excited at a wavelength of 350 nm, were directly used for probing Hg(II) with satisfying selectivity, presenting a linear range of 0.1–5.0 mM and a detection limit of 33 μM. The sensor showed good performance in real sample analysis with recoveries ranging from 99% to 103%, and comparable accuracy with atomic fluorescence spectroscopy, manifesting the reliability of the current strategy for sensing Hg(II).
Water-soluble copper nanoclusters with blue, green, and red emissions were synthesized by employing ethanediamine, cysteine, and glutathione as surface ligands respectively, and the blue-emitting nanoclusters with strong emission and terrific stability were directly used for selectively sensing Hg 2+ .
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高影响因子
Nano Materials Science
·
2021
·
IF 0
Biao Zeng,Wei Wang,Sijin He,Guo Lin,Wenjia Du,Jun Chang,Zhao Ding
Mercury (Hg) ions can lead to a serious impact on the environment; therefore, it was necessary to find an effective method for absorbing these toxic Hg ions. Here, the adsorbent (Zn-AHMT) was synthesized from zinc nitrate and 4-amino-3-hydrazine-5-mercapto-1,2, 4-triazole (AHMT) by one-step method and, characterized the microstructure and absorption performance by fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), Thermal Gravimetric Analyzer (TGA) and X-ray photoelectron spectroscopy (XPS). Through a plethora of measurements, we found that the maximum adsorption capacity was 802.8 mg/g when the optimal pH of Zn-AHMT was 3.0. The isothermal and kinetic experiments confirm that the reaction process of Zn-AHMT was chemisorption, while the adsorption process conforms to the Hill model and pseudo second order kinetic model. Thermodynamic experiments showed that the adsorption process was spontaneous and exothermic. Selective experiments were performed in the simulated wastewater containing Mn, Mg, Cr, Al, Co, Ni, Hg ions. Our results showed that the Zn-AHMT has a stronger affinity for Hg ions. The removal rate of Zn-AHMT remained above 98%, indicating that the Zn-AHMT had a good stability validated by three adsorption-desorption repeatable tests. According to the XPS results, the adsorption reaction of Zn-AHMT was mainly attributed to the chelation and ion exchange. This was further explained by both density functional theory (DFT) calculation and frontier molecular orbital theory. We therefore propose the adsorption mechanism of Zn-AHMT. The adsorption reaction facilitates via the synergistic action of S and N atoms. Moreover, the bonding between the adsorbent and the N atom has been proved to be more stable. Our study demonstrated that Zn-AHMT had a promising application prospect in mercury removal.
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REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Xiaoqing Zhao,Na Wang,Hou Chen,Liangjiu Bai,Hui Xu,Wenxiang Wang,Huawei Yang,Donglei Wei,Lixia Yang
In this paper, a functional nanoprobe based on graphene oxide (GO) composites was successfully prepared for detection of mercury ion (Hg(II)) with high sensitivity. GO as a substrate was modified and used for the growth of polymer chains to synthesize polyacrylonitrile-grafted GO (PAN- g -GO) by activator generated by electron transfer atom transfer radical polymerization (AGET ATRP). Under the condition of visible light shines, the PAN- g -GO was further modified to prepare [poly(acrylonitrile- co -vinyl(diphenyl pyridine))]-grafted GO (P(AN- co -PHPY)- g -GO) nanomaterial by one-step synthesis. Finally, P(AN- co -PHPY)- g -GO as a nanoprobe was dropped to the surface of the glassy carbon electrode and assembled to the electrochemical sensor . Moreover, it can effectively improve the enrichment capacity of mercury ions and increase the electron transfer rate on the electrode surface. Differential pulse anodic stripping voltammetry (DPASV) was used to evaluate the electrochemical performance. Under optimum conditions, the response of Hg(II) at this resulting sensor was linear in the range of 2.0 μM~0.1 nM with a detection limit of 0.06 nM. Additionally, this sensor showed excellent reproducibility, selectivity and stability.
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ENERGY & FUELS
·
2018
·
IF 3.024
Yang Peng,Xiangjiang Liu,Xun Gong,Xiaomin Li,Yifu Liu,Erwei Leng,Yang Zhang
In this study, three kinds of monocarboxylic acids, formic, acetic, and propionic acids, are first applied to modified microalgae residuals (M1-RD, M2-RD, and M3-RD, respectively) after lipid extraction, aiming to enhance the adsorption capacity and selective binding ability for Hg(II) ions in simulated wastewater. The effect of pH, temperature, and initial Hg(II) concentration was investigated to identify the optimum adsorption conditions. Batch adsorption tests showed that the maximum adsorption efficiency obtained was 96.7% for M1-RD, 91.1% for M2-RD, and 84.4% for M3-RD at pH 4.05 compared to 48.5 and 57.6% for raw and residual microalgae at pH 5.01, respectively. The adsorption capacity of raw, residual, and modified microalgae increased with the increase of the temperature. Langmuir and Freundlich isotherm model tests showed that the maximum equilibrium adsorption capacity among three modified adsorbents reached 63 ± 3 mg/g for M1-RD, in contrast to 17 ± 1 and 25 ± 2 mg/g for raw and residual microalgae, respectively. The characterization of the modified sample by Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller, and scanning electron microscopy showed that the fibrous structure of the algae was decomposed by carboxyl groups in organic acids involved in microalgae, resulting in a larger surface area and more binding sites. In consideration of ion interference in the actual process, a kind of actual desulfurization wastewater from a 1000 MW coal-fired power plant (Guangdong, China) was introduced in the simulated adsorption system. Verification tests in desulfurization wastewater showed that up to 96% of Hg(II) ions were removed, probably as a result of co-precipitation of mercury and other co-existing ions.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Fang Li,Pengying Zhang,Jiayi Chen,Jiahui Xi,Shuai Gao,Yunhong Liu
Mercury ion (Hg 2+ ), a highly toxic and bioaccumulative pollutant, can contaminate medicinal herbs and pose significant risks to human health via the food chain. With the growing global demand for traditional Chinese medicine (TCM), there is an urgent need to develop reliable and sensitive Hg 2+ detection methods. In this paper, a novel electrochemical sensor based on magnetic nanoparticles and thymine-Hg 2+ -thymine (T-Hg 2+ -T) coordination chemistry was developed for detecting Hg 2+ in TCM. The magnetic Fe 3 O 4 /Au nanoparticles (Fe 3 O 4 /Au NPs) were synthesized and employed as carriers to conjugate with T-rich thiol-modified DNA probes. In the absence of Hg 2+ , the DNA probes hybridized with ferrocene (Fc)-labeled complementary DNA (cDNA), bringing the Fc signal molecules close to the Fe 3 O 4 /Au NPs surface. In the presence of Hg 2+ , these probes preferentially formed stable T-Hg 2+ -T complexes, effectively inhibiting cDNA hybridization. The Hg 2+ concentration was determined by measuring the corresponding changes in the Fc current. The sensor exhibited a good linear response to Hg 2+ in the range of 0.1–100 ng/mL, with a low detection limit of 0.08 ng/mL. Furthermore, the method was successfully applied to determine Hg 2+ in representative TCM matrices (Lotus leaf, Lonicera japonica , Angelica dahurica , and Houttuynia cordata Thunb.) with satisfactory recoveries (96.73 %−104.84 %). This indicates that the proposed method is particularly suitable for Hg 2+ determination in complex TCM samples, providing a practical solution for quality control and safety monitoring in TCM.
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高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Hao Zhang,Xupeng Liu,Biao Zhou,Ziyue Chen,Jundi Cheng,Kehang Zeng,Lizhi Zhang,Hongwei Sun,Zhihui Ai
Mercury (Hg) is a toxic metal of great concern, and its reduction from Hg(II) to Hg(0) is crucial to prevent its mobilization and transformation to even more hazardous methylmercury. Fe° could reduce Hg(II), but the role of active hydrogen species (*H) remains unexplored. Herein, we prepared the phosphate-modified zero-valent iron by ball milling (P-ZVI bm ) and investigated its Hg(II) reduction and immobilization capacity compared with the ZVI bm counterpart. P-ZVI bm rapidly adsorbed and reduced Hg(II) from water at a rate 22 times faster than ZVI bm , with *H accounting for 36% of Hg(II) reduction. A greatly higher proportion of negative surface electrostatic potential on P-ZVI bm (50.38%) than ZVI bm (37.61%) facilitated the adsorption of Hg(II) cation. H 2 O adsorption on P-ZVI bm was more favorable, as demonstrated by the in situ ATR-FTIR spectra, H 2 O TPD-mass spectra, and the substantially lower adsorption energy (-0.78 eV) than ZVI bm (-0.17 eV). The energy span of H 2 O dissociation to *H also decreased from 2.80 eV on ZVI bm to 1.99 eV on P-ZVI bm . Moreover, *H adsorption energy on P-ZVI bm (1.70 eV) was lower than on ZVI bm (-1.20 eV), thereby inhibiting consumption of *H by H 2 evolution. P-ZVI bm demonstrated remarkable efficacy in removing Hg(II), Cu(II), Ni(II), Cd(II), and Pb(II) from electroplating and mining wastewater. These results highlight P-ZVI bm as a promising material for Hg(II) and other heavy metal remediation and underscore the essential role of *H in the enhanced Hg(II) reduction.
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高影响因子
International Journal of Analytical Chemistry
·
2019
·
IF 1.682
Xiaotian Zhu,Chang Liu,Jie Liu
A new colorimetric assay for the detection of sulfide anions with high sensitivity and selectivity is reported, utilizing Au-Hg alloy nanorods (Au-HgNRs) as probe. Au-HgNRs were prepared by modifying gold nanorods (AuNRs) with reducing agent and mercury ions. In an aqueous solution with sulfide anions, the formation of mercuric sulfide due to redox reaction between the amalgams and sulfide anions greatly changed the surface chemistry and morphology of the Au-HgNRs, leading to a red shift of the localized surface plasmon resonance (LSPR) absorption peak, accompanied by a change in colorimetric response. A good linear relationship was obtained between the LSPR peak wavelength shift and concentration of sulfide anion in the range of 1 × 10−5−1 × 10−4 mol/L. The selectivity of this method has been investigated by other anions. The colorimetric sensing system successfully detected sulfide in wastewater from leather industry.
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高影响因子
ACS Omega
·
2025
·
IF 4.3
Tao Shen,Guodong Wu,Li Yin,Tianen Chen,JiYe Fan,Yuanhao Wang,Shifeng Wang
Developing efficient adsorbents for removal of organic pollutants and heavy metals is essential for environmental protection. In this study, a series of GO/UiO-66-(OH)2 composites were synthesized and characterized using XRD, FT-IR, and SEM, confirming enhanced thermal stability, reduced aggregation, and maintained crystallinity of UiO-66-(OH)2 due to GO incorporation. Batch adsorption experiments showed that GO increased the adsorption capacity, with GO-8/UiO-66-(OH)2 achieving 324.2 mg/g for diclofenac sodium (DCF) and 429.3 mg/g for Hg2+. DCF adsorption was primarily governed by physisorption, while Hg adsorption was chemisorptive, involving strong coordination with oxygen functional groups. Kinetic and isotherm studies revealed the suitability of the pseudo-second-order and Freundlich models, with thermodynamic analysis showing exothermic DCF adsorption and endothermic Hg2+ adsorption. The composites also exhibited high selectivity and stable regeneration, making them promising candidates for practical environmental remediation.
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高影响因子
SENSORS
·
2025
·Vol. 25
·期 3
·623
·
IF 3.5
Yuzhen Wang,Ningna Shi,Xiaoyue Kang,Qiliang Pan,Maozhong Tian,Yanfeng Wang,Yunfeng Bai
A sensitive and specific competitive electrochemical immunosensor for the detection of Hg (II) using a modified electrode based on molybdenum disulfide/reduced graphene oxide/gold (MoS2/rGO/Au) nanocomposites was developed in this study. The nanocomposites were characterized and assembled with an antibody against Hg (II) for the immunosensor, demonstrating good electrical activity, high affinity and high specificity. Free Hg (II) in a solution can be measured by the competitive reaction of the Hg element in the sample and the antigen with the antibody fixed on the electrode. A differential pulse voltammetry (DPV) method was used, and the competitive current changed in accordance with the concentration of Hg (II). Under optimal conditions, the sensor showed a linear relationship from 0.1 to 600 ng/mL, and the limit of detection (LOD) was 63 pg/mL. The proposed immunosensor showed an acceptable recovery from 98.4% to 100.3% in spiked samples. Satisfactory stability and reproducibility were obtained. Competitive species, including Zn (II), Mg (II), Al (III), Cu (II), Pb (II), Ba (II), Cd (II), Ag (I), MNA, CH3Hg (I) and CH3Hg-MNA, were selected and applied according to the procedure of the assay, and their significantly different response compared to Hg (II) indicated that the assay displayed not only high sensitivity but also high selectivity. This immunosensor offers a useful model for the detection of Hg (II).
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Minghu Zhao,Zhen Huang,Shixing Wang,Libo Zhang,Yang Zhou
Mercury ions can cause a series of hazards to humans and the environment, even in trace amounts. Here, we designed a novel adsorbent (Cys-UiO-66) by functionalizing NH2-UiO-66 with l-cysteine for selective removal of Hg(II) from solution. The Cys-UiO-66 was characterized by different instruments. The adsorption property of Cys-UiO-66 was evaluated by batch methods. The maximum adsorption capacity was 350.14 mg/g at pH 5.0. Furthermore, the adsorption isotherm and kinetics models were in accord with the Langmuir and pseudo-second-order models, respectively, evidencing that the adsorption behavior was dominated by monolayer chemisorption. The Cys-UiO-66 had better affinity for Hg(II) than other coexisting ions in wastewater and could be regenerated for at least five cycles. The results prove that Cys-UiO-66 is a talented and efficient sorbent for mercury ions.
研究领域:
环境化学
·
材料科学
·
吸附技术
·
重金属去除
·
水处理
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Jiao He,Congwei Li,Xinjian Cheng
Three chitosan-BODIPY probes were prepared in this work. The water solubility of original chitosan has been improved. Water soluble fluorescent probes were obtained. They also exhibited good sensing ability to Hg 2+ /Hg + ions. Firstly, through the amidation reaction, arginine, cysteine, and tryptophan were grafted respectively onto chitosan chains. And then chitosan-BODIPY probes were produced by means of Schiff base formation reaction. By this way, the high structural regularity of chitosan polymer chains was changed with introducing amino acids and fluorescent groups. It also endowed fluorescence sensing ability. They could recognize Hg 2+ /Hg + ions with the interaction of C N groups. It could selectively recognize Hg 2+ /Hg + in aqueous solution, the detection limits reached 0.747μM/0.783 μM. Moreover, by the introduction of hydrophilic groups, the contact angle of modified chitosan film was improved as well. It realized performance transformation from the hydrophobic to hydrophilic. The viscoelasticity , thermal, rheological properties and fluorescence properties of the hydrogels were investigated. C N groups not only acted as a binding site to coordinate with heavy metals, but also could enhance the water solubility of the fluorescent chitosan.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 1
·2283-2297
·
IF 5.19
Hu Yuting,Wang Shixing,Zhang Libo,Yang Fan
In wastewater, heavy metal Hg causes serious harm to ecology, so it needs to be removed. In this paper, a novel MOF adsorbent (UiO-66-QU) was prepared by modifying UiO-66-NH 2 with 4-quinolinecarboxaldehyde, which was used to selectively remove Hg(II) from water. The adsorbent was characterized using Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), zeta potentiometer, and X-ray photoelectron spectroscopy (XPS). In order to investigate the Hg(II) adsorption performance of UiO-66-QU, the effect of time, initial concentration, pH, and temperature were carried out. Langmuir model fitting shows that the maximum adsorption capacity of UiO-66-QU for Hg(II) is 556 mg/g at 298 K. The experimental results show that UiO-66-QU has better Hg(II) adsorption capacity than UiO-66-NH 2 . The isotherm is in accordance with pseudo-second-order models. It is indicated that the adsorption process is mainly monolayer chemical adsorption. The thermodynamic parameters also indicate that the adsorption process is spontaneous and endothermic. It has excellent reusability and selectivity. XPS and the zeta potential showed that the adsorption mechanism was the complex reaction of Hg(II) with nitrogenous group. Therefore, the adsorbent has potential application prospects in removal of Hg(II) from wastewater.
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高影响因子
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