MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Lu Feng,Tianyu Zeng,Haobo Hou
For the serious hazards to human and natural environment caused by the toxic Hg(II), a new MOF-based adsorption material, UiO-66-AHMT, was designed and synthesized by incorporating the 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole molecule into the UiO-66-NH 2 matrix and used for the removal of Hg(II) from aqueous media. As expected, UiO-66-AHMT exhibits rapid removal ability toward Hg(II) and maximum uptake capacity of 327.88 mg/g at 298 K and pH = 5, the adsorption capacity is improved significantly compared to the unmodified UiO-66-NH 2 and comparable in the excellent UiO-66 based adsorbents reported so far. The adsorption behaviors of UiO-66-AHMT conform well to the pseudo-second-order and Langmuir models, respectively, which indicate that the adsorption process is mainly monolayer chemisorption . Meanwhile, UiO-66-AHMT shows strong selectivity to Hg(II) in the coexistence of varieties of metal ions and outstanding recyclability characteristics. To investigate the adsorption mechanism, the Hg(II) loaded UiO-66-AHMT mainly analyzed by XPS suggests that the nitrogen- and sulfur-containing groups in grafted molecule have the synergistic complexation to Hg(II). Furthermore, the binding strength between different function sites and Hg(II) are quantified and the stable complexation patterns are obtained based on the DFT calculation. These results strongly confirm that UiO-66-AHMT is a potential adsorbent in the practical treatment of wastewater containing Hg(II).
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
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yu-Feng Sun,Jing-Jing Li,Feng Xie,Yan Wei,Meng Yang
Metal oxides nanomaterials are limited in electrochemical detection of heavy metal ions (HMIs) because of their poor conductivity and less active sites, which hinders electron transport and reduce the redox rate of HMIs, making it difficult to achieve sensitive and accurate detection of trace pollutions. Herein, Ru-loaded cerium dioxide nanocubes (Ru/CeO 2 ) with rich oxygen vacancies (OVs) was developed to construct electrochemical sensing interface. An unexpected sensitivity of up to 2169.8 μA μM −1 cm -2 was obtained with a detection limit of 0.019 μM in the detection of Hg(II). The predominantly exposed highly active (100) crystal facets and abundant OVs on the surface of CeO 2 nanocubes, as well as Ru nanoparticles with excellent metal activity, providing large amounts of reactive oxygen species and active sites, thereby enhancing the conductivity and adsorption capacity of the nanocomposites. Ultimately, the outstanding electrochemical signal was achieved by promoting the redox reaction of Hg(II). In addition, the proposed method shows the excellent stability and high anti-interference ability, and the accurate analysis of Hg(II) in real water samples was realized. This finding provides a good strategy for the development of nano-metal oxide with OVs for the reliable determination of trace heavy metal substance.
研究领域:
材料科学
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环境科学
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分析化学
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DOI
高影响因子
Analytical Methods
·
2024
·Vol. 16
·期 29
·4951-4959
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IF 2.7
Weiqin Zhao,Ruichen Zhai,Qianxiao Chen,Chun Huang,Haojia Li,Youyu Zhu,Yingfeng Duan,Jie Gao
Glutathione (GSH) is commonly used as a diagnostic biomarker for many diseases. In this study, based on carbon quantum dots prepared from dragon fruit peel (D-CQDs) and the T-Hg(II)-T mismatch, a dual-mode biosensor was developed for the detection of GSH. This system consists of two single-stranded DNA (ssDNA). DNA1 was the T-rich sequence; DNA2 was attached to streptavidin-coated magnetic beads and consisted of T-rich and G-rich fragments. Due to the presence of Hg(II), the T-Hg(II)-T mismatch was formed between T-rich fragments of two ssDNA. In the presence of GSH, Hg(II) detached from dsDNA and bound with GSH to form a new complex. The G-rich fragment assembled with the hemin shed from D-CQDs to form the G-quadruplex/hemin complex. At this time, in fluorescence mode, the fluorescence of D-CQDs quenched by hemin could be restored. In colorimetric mode, after the magnetic beads separate, a visual signal could be produced by catalyzing the oxidation of ABTS using the peroxide-like activity of the G-quadruplex/hemin complex. This biosensor in both fluorescence mode and colorimetric mode had excellent selectivity and sensitivity, and the limit of detection was 0.089 µM and 0.26 µM for GSH, respectively. Moreover, the proposed dual-mode biosensor had good application prospects for detection of GSH.
研究领域:
生物化学
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纳米生物学
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分析化学
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DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
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IF 9.8
Mingling Xiao,Xiaofang Lai,Jun He,Jiahao Huang,Zhenhua Tang,Ruiwen Wu,Jikang Jian
FeS (mackinawite) is known to be effective in the sorption of aqueous Hg(II). However, FeS nanoparticles are apt to aggregate and easy to be oxidized, which limits their wide applications. Here, we have synthesized FeS micro-flakes which can be uniformly dispersed in water without aggregation. Owing to the good stability and dispersibility, FeS micro-flakes exhibit high efficiency in the removal of Hg(II) from water. The sorption of Hg(II) on the FeS micro-flakes is more consistent with the pseudo-second-order kinetic model and Langmuir model, indicating that the sorption of Hg(II) is mainly monolayer sorption dominated by chemical sorption. The maximum sorption capacity is 2680 mg/g at pH 5.6 and 30 °C, significantly higher than those of FeS nanoparticles and other Hg(II) scavengers. The pH studies indicate that FeS (0.31 g/L) can effectively remove >97.6 % of 200 mg/L Hg(II) in the pH range of 2–12 at 30 °C. Powder X-ray diffraction, elemental and sorption analyses suggest that Hg(II) is removed via chemical precipitation and surface adsorption. This study demonstrates the potential and viability of FeS micro-flakes for efficient removal of aqueous Hg(II).
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 ENVIRONMENTAL ENGINEERING
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2024
·Vol. 150
·期 11
·04024050
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IF 1.6
Huanglong Zhuang,Guiyang Yan,Jiwei Wang,Zhuang Hu,Siqi Yan,Yinkai Sun,Tuanyu Guo,Jianshe Hu,Aikebaier Reheman
This study presents a groundbreaking composite adsorbent, STB@MOF-808-SH, developed through the innovative amalgamation of thiol-functionalized metal-organic framework material (MOF-808-SH) with sulfur-doped C3N4 tubular bundles (STB), targeting the effective elimination of toxic mercury [Hg(II)] ions from polluted water. Our investigation explores crucial determinants of the adsorption process, including pH, initial Hg(II) concentration, and the impact of coexisting ions, while revealing the significant enhancement in mercury ion removal efficiency and adsorption capacity due to the synergistic interaction between STB and MOF-808-SH. Remarkably, under optimal conditions at pH 4.0, STB@MOF-808-SH achieves a removal rate of 91.35% and an impressive adsorption capacity of 228.38 mg/g. These outcomes suggest that the development of the STB@MOF-808-SH composite adsorbent introduces a novel and efficacious approach to tackling water pollution issues, highlighting its potential as a cost-effective and efficient solution for the remediation of toxic Hg(II) ions in wastewater.
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
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+ .
研究领域:
材料科学
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分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2014
·
IF 5.323
Chao Shan,Zhiyao Ma,Meiping Tong,Jinren Ni
Fe 3 O 4 @SiO 2 magnetic nanoparticles modified by grafting poly(1-vinylimidazole) oligomer (FSPV) was fabricated as a novel adsorbent to remove Hg(II) from water. Fourier transform infra-red spectroscopy confirmed the successful grafting of oligomer , and thermogravimetric analysis showed FSPV had a high grafting yield with organic content of 22.8%. Transmission electron microscopy image displayed that FSPV particles were polymer-coated spheres with size of 10–20 nm. With saturation magnetization of 44.7 emu/g, FSPV particles could be easily separated from water with a simple magnetic process in 5 min. The Hg(II) adsorption capacity of FSPV was found to be 346 mg/g at pH 7 and 25 °C in 10 mM NaCl. Moreover, the removal of Hg(II) by FSPV was not obviously affected by solution pH (from 4 to 10) or humic acid (up to 8 mg/L as TOC). The presence of seven common ions including Na + , K + , Ca 2+ , Mg 2+ , Cl − , NO 3 − , and SO 4 2 − (up to 100 mM ionic strength) slightly increased the adsorption of Hg(II) by FSPV. X-ray photoelectron spectroscopy analysis revealed that the N atom of the imidazole ring was responsible for the bonding with Hg(II), whereas the bonding of Hg with N did not result in cleavage of Hg–Cl bond in HgCl 2 and HgClOH. The regeneration of Hg(II)-loaded FSPV could be achieved with 0.5 M HCl rapidly in 10 min, and the removal of Hg(II) maintained above 94% in five consecutive adsorption–desorption cycles. Therefore, FSPV could serve as a promising adsorbent for Hg(II) removal from water.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Progress in Natural Science-Materials International
·
2023
·
IF 4.7
Xuechun Wang,Zeming Dai,Xuan Zhou,Hao Chen,Yu Cao,Jianhua Hou,Xiaozhi Wang
In general, majority of MOFs are powder, which limit their applications. In this study, the highly stable Zr-based MOF-808 and its thiol-modified MOF-808-SH were selected as precursors, and then they were wrapped by sodium alginate hydrogel via a dripping strategy. Based on these, MOF/hydrogel composite beads (Alg-MOF-808, Alg-MOF-808-SH) with 3D network structure were prepared successfully. Due to its excellent adsorption properties and easy recovery, they were employed as effective environmental functional materials for the adsorption of Hg (II). The adsorption capacities of Hg (II) were 170.52 mg‧g −1 and 221.73 mg‧g −1 respectively and they can achieve adsorption equilibrium in a short time. The adsorption stability of Alg-MOF-808-SH was studied at different pH as well. In addition, the removal efficiency of composite beads for Hg (II) was almost unaffected by other coexisting ions, displaying good adsorption selectivity. Furthermore, the removal efficiency only decreased by 10.4% after 5 cycles, indicating that the as-prepared materials have high recycling efficiency. The results demonstrated that the MOF/hydrogel composite beads have a certain application potential for mercury removal in actual wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Wei Qin,Guanyin Qian,Haibin Tao,Junwei Wang,Jiayin Sun,Xiaofeng Cui,Yuanguang Zhang,Xianlong Zhang
This research focused on developing a series of (G1.0, G2.0, G3.0 and G4.0) PAMAM dendrimers modified attapulgite (ATP) sorbents (G1.0-G4.0 PAMAM-ATP) to remove Hg(II) from aqueous solution. The effects of several parameters including solution pH, contacting time, temperature and initial Hg(II) ion concentration were studied. Batch sorption results showed that the adsorption process was rapid and over 90% of Hg(II) was removed within 80 min at optimal pH 5.0. The adsorption capacity of PAMAM-ATP adsorbents followed the order of G2.0 > G1.0 > G3.0 > G4.0 and the maximum adsorption capacities significantly increased from 5 mg/g (raw ATP), 90 mg/g (amine modified ATP, M-ATP), 192.5 mg/g (polyacrylamine modified ATP, PAM-ATP) by previous similar studies to 200.8 mg/g (G2.0-PAMAM-ATP). Kinetics of adsorption was suitable for pseudo-second-order and controlled by chemical adsorption over a whole sorption range. The adsorption capacities increased as temperature rise from 283 to 303 K and the thermodynamics properties implied that the adsorption processes was spontaneous and endothermic. Thus, the adsorption capacities decreased when the temperature was above 303 K. The isotherm adsorption was described by Langmuir model well with monolayer behavior. A specific coordination between Hg(II) and the N, O atoms on the functional groups of PAMAM-ATP surface was determined by XPS analysis . Furthermore, the maximum adsorption capacity of the regenerated G2.0-PAMAM-ATP sorbents could still be higher than 90% after five cycles by acid treatment. The favorable adsorption capacity compared with other adsorbents exhibited that G2.0-PAMAM-ATP was an excellent renewable sorbent for Hg(II) removal.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2022
·Vol. 96
·期 7
·1561-1566
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IF 0.791
Xu Rong,Tan Hao,Guo Meng,Zuo Shixiang,Sun Xueni
Abstract Thiol-functionalized organosilica (OS-SH) was synthesized via an ultra-fast sol–gel procedure without using any templates. The OS-SH was then employed as an adsorbent to remove Hg(II) ions from aqueous solution. Pore structure and material morphology were characterized by FTIR, TGA, SEM, TEM, and N 2 sorption measurements. The OS-SH adsorbents demonstrated an outstanding adsorption performance (72.48 mg g –1 at pH 3). The adsorption isotherm can be best described by the Langmuir model, suggesting a monolayer adsorption behavior by chemical mechanism. The adsorption kinetics of Hg(II) on OS‑SH was well fitted by the pseudo-second-order model. The synthesis approach proposed in this study provides a much simple, tender as well as highly efficient way to design functional porous adsorbents for the removal of heavy metal ions.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 1
·2283-2297
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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.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xin Yan,Huacai Ge
In this study, a novel modified chitosan composite adsorbent (UNCS) was prepared by crosslinking between chitosan and metal organic frameworks (MOFs) material UiO-66-NH 2 using epichlorohydrin as crosslinker. The influence of the prepared conditions was investigated. The structure and morphology of the composite were characterized by FT-IR, XRD, SEM, TGA, BET and zeta potential analysis. Effects of different variables for adsorption of Hg(II) on this adsorbent were explored. The kinetic studies indicated that the adsorption process followed the pseudo-second-order kinetic model and the adsorption equilibrium could be reached within 2 h. The adsorption was mainly controlled by chemical process. Adsorption isothermal studies illustrated that the adsorption fitted Langmuir isotherm model, implying the homogeneous adsorption on the surface of the adsorbent. The adsorbent exhibited high uptake and the maximum capacity from Langmuir model could reach 896.8 mg g −1 at pH 6. Thermodynamic studies showed the spontaneous nature and exothermic nature of the adsorption process. Additionally, the removal of Hg(II) on UNCS could achieve over 90 %. The adsorption-desorption cycled experiments indicated the appropriate reusability of the adsorbent. Hence, this adsorbent would be promising for the removal of Hg(II) from wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）