MICROCHEMICAL JOURNAL
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2025
·
IF 5.1
Xijin Zhao,Xin Kou,Xin Li,Mingjia Li,Ding Xi,Amjad Farid,Hui Huang,Yongpeng Zhao
Herein, multi-layer composite electrodes of MnFe 2 O 4 @carbon nanotubes/carbon cloth (MFO@CNT/CC) are prepared by dip coating and the subsequent hydrothermal method. Flexible conductive carbon cloth (CC) substrate provides a 3D strong base support. The carbon nanotubes (CNT) connected by CC form a conductive network with a large specific area, which is also conducive to electron transfer. The modified MnFe 2 O 4 nanoparticles have abundant active sites, which can enhance the electrochemical activity. CNT and MnFe 2 O 4 nanoparticles form a tandem structure beneficial to increase the active site and promote the response to heavy metal ions. The MFO@CNT/CC electrode has good detection performance for Cd 2+ (0.25–12 ppm) and Pb 2+ (0.25–12 ppm) and a low detection limit of 0.25 ppm. In the presence of interfering ions, it exhibits a highly selective response to the target ion, with minimal current changes and a range of variations (−3.48–5.59 %). The actual detection recovery is in the range of 97.33–101.17 %, suggesting its practical reliability. Furthermore, we propose a detection and analysis method that combines electrochemistry with machine learning; the model attains a perfect classification accuracy of 100 % for both Pb 2+ and Cd 2+ , underscoring the robustness of the classification. Overall, this work provides innovative composites and performance explorations for advancing high-performance simultaneous detection of heavy metal ions.
研究领域:
材料科学
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环境科学
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电化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Wanyu Zhang,Jian Liang,Sufeng Wang,Mingyang Lin,Jingshan Li,Li Chen,Yingchao Zhang,Tifeng Jiao
This study reported a new strategy for enhanced Pb 2+ and Cu 2+ sequestration by Artemia cyst shell (shell) supported nano-Mg from aqueous solutions and the carbonated exhausted-adsorbents sequenced potential application in photo-catalyst, which obtained two expected results. One is that the immobilization of nano-Mg onto Artemia cyst shell (shell-Mg) can greatly strengthen the adsorption effect of the neat cyst shell on Pb 2+ and Cu 2+ . The adsorption capacities of shell-Mg for both metal ions reached to 622.01 and 313.91 mg/g, which was 10–15 and 30–50 times that of the neat shell respectively. And shell-Mg has strong selectivity , which was approximately 2–4 times that of shell. The shell-Mg can be used to retrieve Pb 2+ and Cu 2+ from aqueous solutions efficiently. Another is that the carbonated exhausted-adsorbents (C-shell-Mg-Pb and C-shell-Mg-Cu) showed their potential photocatalytic degradation effects on congo red under pH = 4 condition, the decolorization rate reached to 61.19% and 80.39% respectively. Reuse of exhausted adsorbents can avoid the secondary pollution caused by the regeneration, extend the utilization value of exhausted adsorbents, and provide a new viewpoint for the reuse of spent bio-nanomaterial adsorbents.
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 Cleaner Production
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2020
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IF 7.246
Chunsheng Xie,Xiangjin Huang,Shoulian Wei,Chun Xiao,Jiangfei Cao,Zhenxing Wang
An environmentally friendly dual-template magnetic ion imprinted polymer (DMIIP) of Cd 2+ and Pb 2+ were prepared by surface imprinting technique combined with a sol-gel process using Cd 2+ and Pb 2+ as dual-templates, papain as a functional monomer and magnetic mesoporous Fe 3 O 4 @mSiO 2 as substrate. The Polymer was characterized using scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and adsorption experiments. Maximum adsorption capacities of DMIIP were 41.69 for Cd 2+ and 76.39 mg/g for Pb 2+ in a mixed solution. We also studied factors affecting adsorption and desorption of Cd 2+ and Pb 2+ . DMIIP clearly demonstrates a stronger ability than dual-template magnetic none-ion imprinted polymer (DMNIP) to selectively adsorb Cd 2+ and Pb 2+ from solutions containing other metal ions . Absorption by DMIIP was well fitted with a pseudo-second-order kinetic model . After eight adsorption-desorption cycles, adsorption capacity of DMIIP relative to Cd 2+ and Pb 2+ decreased 6.1% and 6.3%, respectively. The developed MISPE-GFAA method using DMIIP as adsorbent was satisfied to Cd 2+ and Pb 2+ determination in soil and food samples. The polymer could be a green and promising adsorbent to remove Cd 2+ and Pb 2+ from soil and food samples.
研究领域:
环境科学
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分析化学
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产品关联
DOI
高影响因子
Micro & Nano Letters
·
2018
·Vol. 13
·期 8
·1175-1178
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IF 0.841
Qiao Cheng,Yu He,Yili Ge,Gongwu Song
In this work, 3-aminophenylboronic acid was used as the starting materials to construct boron and nitrogen co-doped carbon dots with tunable dual-emission intensity at 420 and 540 nm with different excitation at 360 and 500 nm, respectively. The dual-emission carbon dots sensor is employed for rapid and sensitive fluorescence-enhancing detection of Pb 2+ . Compared with previous reported methods, their method showed better linear ranges or detection limits. Under the optimal conditions, the limit of detection of 0.9 nM for Pb 2+ was reached with a wide range of 9 nM to 438 μM. The authors believe that the established method has more opportunities for application for other environmental targets.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Talanta Open
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2021
·
IF 0
Yuwen Pu,Yalin Wu,Zhihui Yu,Liping Lu,Xiayan Wang
The high adsorption capacity of Fe 3 O 4 and C 3 N 4 for heavy metals and the amalgam effect of Bi 2 O 3 were exploited using a Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 -modified glassy carbon electrode (GCE) for the determination of Cd 2+ and Pb 2+ . The electrochemical response performance of the Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE was studied by square-wave anodic stripping voltammetry. The electrochemical conditions were optimized, including the pH of the buffer solution, content of Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 on the electrode surface, deposition potential and deposition time. Under optimum conditions, the Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE sensor shows a linear response from 0.01 μmol/L to 3 μmol/L. The minimum detectable quantity for Cd 2+ and Pb 2+ are 3 × 10 −9 mol/L and 1 × 10 −9 mol/L, respectively. Interference studies were carried out. The sensitivity of the Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE sensor to Cd 2+ and Pb 2+ does not significantly change in the presence of coexisting heavy metal ions. The Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE sensor exhibits good stability and repeatability. The Fe 3 O 4 /Bi 2 O 3 /C 3 N 4 /GCE sensor was used to detect Cd 2+ and Pb 2+ in river water samples to demonstrate its real-world application.
研究领域:
环境科学
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分析化学
✓ 已验证
DOI
RSC Advances
·
2018
·Vol. 8
·期 68
·38929-38934
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IF 2.936
Qianyun Li,Yongmei Jia,Zongcai Feng,Fang Liu
Lead is a highly toxic heavy metal, and various functional nucleic acid (FNA)-based biosensors have been developed for the detection of Pb2+ in environmental monitoring. However, most fluorescence biosensors that have been reported were designed on the basis of a double-labeled (fluorophore and quencher group) DNA sequence, which not only involved an inconvenient organic synthesis but also restricted their wider use in practical applications. Here, we utilized a G-rich DNA sequence as a recognition probe and conjugated fluorene (CF) to develop a fluorescence sensor without a quencher based on the aggregation-caused quenching (ACQ) effect. In the presence of Pb2+, the degree of aggregation of CF was reduced because Pb2+ induced the formation of a G-quadruplex structure of the CF-DNA probe, and the fluorescence signal increased with the concentration of Pb2+ (0–1 μM), with a limit of detection of 0.36 nM. This fluorescent probe without a quencher enables the sensitive and selective detection of Pb2+. On the basis of these advantages, the CF-DNA probe represents a promising analytical method for detecting Pb2+.
研究领域:
生物化学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
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2014
·Vol. 5
·期 14
·4332-4338
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IF 5.368
Feng Wang,Liyan Huang,Jun Li,Lina Lin,Zhengping Liu,Zhaoxia Dong
Well-defined superparamagnetic and conductive Fe3O4/polyaniline (PANI) hollow spheres were fabricated using positively charged polystyrene (PS) spheres as templates. The negatively charged Fe3O4 particles, which were decorated by citric acid, can be attached onto the surface of the PS spheres via electrostatic interaction. Subsequently, the PANI layer was coated onto the PS/Fe3O4 templates by in situ chemical oxidative polymerization. Finally, removal of the PS core by dissolving with tetrahydrofuran provided the electromagnetic hollow spheres. Morphologies and compositions of Fe3O4/PANI hollow spheres were investigated by using SEM, TEM, FTIR and XRD. Magnetic analysis demonstrates that the synthesized composite spheres possess the characteristic of superparamagnetism and the saturation magnetization value is 26.2 emu g−1. Batch adsorption shows that the Fe3O4/PANI hollow spheres exhibit high uptake property of Pb2+ in aqueous solution. The adsorption kinetics follows the mechanism of pseudo-second-order kinetics and the sorption agrees well with the Langmuir isotherm.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2018
·
IF 3.849
Shuangzhen Guo,Ning Duan,Zhigang Dan,Fuyuan Xu,Chenmu Zhang,Feifei Shi,Wubin Gao
Three-Dimensional magnetic nanocomposite (Fe 3 O 4 @g-C 3 N 4 ) was first prepared and used to removal Pb 2+ from aqueous solution by adsorption method. Various of techniques were used to character Fe 3 O 4 @g-C 3 N 4 such as scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and thermo-gravimetric analyzer (TGA). Batch experiments with different pH, initial concentration, contact time and ionic strength were used to evaluate the adsorption performance of Fe 3 O 4 @g-C 3 N 4 . The adsorption kinetics data followed pseudo-second-order model. The isothermal adsorption equilibrium data were best described by Langmuir model and predicated adsorption capacity was 423.73 mg g −1 for Pb 2+ . The result of X-ray photoelectron spectroscopy (XPS) survey spectrum suggested that the main adsorption mechanism of Fe 3 O 4 @g-C 3 N 4 for Pb 2+ is the coordination between conjugated π-electron pairs of heptazine (C 6 N 7 ) units or triazine ring (C 3 N 3 ) units and sp 2 C N with metal ions. By comparing the adsorption capacities of Fe 3 O 4 , g-C 3 N 4 and Fe 3 O 4 @g-C 3 N 4 , it can be found that the adsorption capacity of g-C 3 N 4 would increase by increasing the layer spacing. Fe 3 O 4 @g-C 3 N 4 could be regenerated by HNO 3 and the adsorption capacity of regenerative Fe 3 O 4 @g-C 3 N 4 could maintain 89.3% after five cycles. The adsorption capacity of Fe 3 O 4 @g-C 3 N 4 for Pb 2+ is 121.42 mg g −1 in acid electrolytic zinc residue percolate. Therefore, the Fe 3 O 4 @g-C 3 N 4 is a potential adsorbent for removing Pb 2+ from 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
RSC Advances
·
2016
·Vol. 6
·期 10
·7765-7771
·
IF 3.289
Ruipeng Hou,Xiaoqing Niu,Fengling Cui
A highly sensitive and selective label-free biosensor was designed for DNA determination based on target-induced opening of the hairpin DNA and forming a G-quadruplex with protoporphyrin IX (PPIX) as a signal reporter. In the absence of target-DNA (T-DNA), the probe-DNA (P-DNA) forms a hairpin structure. A G-rich sequence in the strand is partially caged in the stem-loop structure and cannot fold into a G-quadruplex. In the presence of T-DNA, the specific combination of targets with the sensing sequence (loop sequence) triggers the release of the G-rich sequence and allows it to fold properly and bind with PPIX resulting in the fluorescence of the G-quadruplex–PPIX providing the readout signal for the sensing event (detection limit of 3.5 nM). Based on the higher efficiency of Pb2+ at stabilizing G-quadruplexes than K+ and the Pb2+-stabilized G-quadruplexes not binding to PPIX, which resulted in fluorescence decrease, the proposed DNA-sensing system can be further exploited as a Pb2+-sensing method. The detection limit for Pb2+ is 2.6 nM.
研究领域:
分析化学
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生物化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Engineering Materials
·
2025
·
IF 3.5
Feng Lin,He Liu,Yu Tang,Xuejun Zheng,Hui Dong
Two-dimensional (2D) materials are widely used in heavy metal ion detection due to their high specific surface area and abundant active sites. Herein, we prepared highly selective and sensitive electrochemical sensors based on 2D graphitic-phase carbon nitride for the detection of Cu2+ and Pb2+ ions and investigated the effects of both tensile and compressive strains on the corresponding detection sensitivity, together with their mechanism. The prepared carbon nitride nanosheet sensors showed detection sensitivities of 3.63 and 0.41 μA·μM·cm–2, detection ranges of 0.2–100 and 6–100 μM, and detection limits of 0.0033 and 0.23 μM for Cu2+ and Pb2+, respectively. The induced compressive strain of −0.25% in the 2D CNNS significantly improved the sensitivity by 40.5% and 31.7%, while the tensile strain of +0.25% reduced the sensitivity by 41.9% and 43.9% in detecting Cu2+ and Pb2+ as compared to those at zero strain, respectively. Through DFT calculations, the corresponding compressive strain of −0.25% reduced the band gap from 1.21 eV under zero strain to 0.94 eV. On the contrary, the tensile strain of +0.25% increased the band gap from 1.21 to 1.45 eV, resulting from the contribution of orbitals of C-p and N-p. The declined and raised band gaps, respectively, result in increased and decreased electron transport rates, thereby improving and degrading the sensitivities of the sensors. Our research provides guidance on the design of flexible wearable sensors integrated into the construction of sensitive and reliable heavy ion detection systems.
研究领域:
材料科学
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分析化学
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电化学
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环境监测
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 22
·6581-6590
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IF 4.478
Wang Junyang,Liu Zheng,Li Ying,Yang Chuanyu,Ma Xinyue,Li Hongxia,Sun Chunyan
Based on a Pb 2+ -specific 8–17 DNAzyme-induced catalytic hairpin assembly (CHA), a simple signal-on fluorescence strategy for lead ion detection was established. 8–17 DNAzyme was used as the recognition element of Pb 2+ , which catalyzed the cleavage of the RNA base embedded in the DNA substrate strand, while releasing part of the substrate strand (S’) as CHA initiator. And two hairpin probes (H1 and H2-FQ) were designed according to the sequence of S’ for CHA, in which H2-FQ was labeled with the fluorophore FAM and quencher BHQ-1 as fluorescent “molecular switch” based on fluorescence resonance energy transfer (FRET). In the presence of Pb 2+ , the CHA reaction was triggered to form a large number of H1-H2 complexes, enabling enzyme-free isothermal amplification and a signal-on fluorescence strategy. In the concentration range of 0.5–1000 nM, the fluorescence signal increases with the increase of Pb 2+ concentration. The quantitative detection limit of Pb 2+ by this method is 0.5 nM, which has better detection performance compared with the FQ-labeled 8–17 DNAzyme method. The established biosensor exhibits good specificity and can be effectively used for the detection of Pb 2+ in real samples of river water and grass carp. Through ingenious nucleic acid sequence design, DNAzyme and CHA reactions are integrated to realize the enzyme-free isothermal amplifications and sensitive detection of Pb 2+ , which holds potential versatility in food supervision and environmental monitoring. Graphical abstract
研究领域:
生物化学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Wenqi Li,Liping Zhang,Die Hu,Ran Yang,Jie Zhang,Ying Guan,Fanxun Lv,Hui Gao
In this study, a novel mesoporous nanocellulose/sodium alginate (SA)/carboxymethyl-chitosan (CMC) aerogel was fabricated using a simple method. The adsorption of Cu 2+ and Pb 2+ on the aerogel in aqueous solutions was investigated. The obtained aerogel was characterized using scanning electron microscopy, fourier-transform infrared spectroscopy, transmission microscope, atomic force microscopy and N 2 adsorption–desorption. Furthermore, the fundamental Cu 2+ and Pb 2+c adsorption behaviours of the mesoporous aerogel, including the effect of pH, adsorption equilibrium and kinetics were investigated. The adsorption isotherms and kinetics of aerogel closely followed the Langmuir model and pseudo-second-order model, respectively, indicating that the adsorption behaviours can be classified as monolayer chemical adsorption. The aerogel exhibited high efficiency for the adsorption of Cu 2+ (169.94 mg/g) and Pb 2+ (472.59 mg/g). The aerogel maintained a high adsorption capacity for Cu 2+ (56 mg/g) and Pb 2+ (245 mg/g) after five adsorption–desorption cycles. Therefore, the as-prepared mesoporous aerogel has great potential in wastewater treatment.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 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）