CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Junjian Niu,Wei Zhang,Shuai Li,Wenjun Yan,Xiaogang Hao,Zhongde Wang,Fengbin Wang,Guangjin Zhang,Guoqing Guan
Although a variety of functional materials have been developed for the separation target ions, most of them suffer from sluggish uptake of ions and deficient selectivity. Herein, a nanocomposite electroactive film with a sandwich-like structure was facilely prepared by intercalating conductive polyaniline (PANI) into the interlayer of montmorillonite (MMT) with layered structure for rapid and selective separation of Pb 2+ ions. This MMT/PANI nanocomposite film exhibited an extreme Pb 2+ ion uptake rate (1422.67 μg∙(g∙s) −1 ), which exceeded those of conventional adsorbents by 2 to 4 orders of magnitude. Meanwhile, trace Pb 2+ ions at ppb level in the wastewater were quantitatively detected by employing the MMT/PANI nanocomposite electroactive film based on its strong affinity towards Pb 2+ ions. It was confirmed that the rapid and selective Pb 2+ ion uptake/release by the MMT/PANI composite film was achieved via the directional proton migration powered by the electrochemical redox of the intercalated PANI, the superfast ion transport in atomically interlamellar ion transport path and the ultra-affinity ion recognition of ion capture sites on MMT layer. It is expected that such an MMT/PANI composite film could be a promising alternative of conventional materials for separating and detecting of Pb 2+ ions in wastewater.
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BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Renyue Ji,Wuceng Niu,Shuai Chen,Wei Xu,Xingduo Ji,Lingyue Yuan,Hangyu Zhao,Minghao Geng,Jingfu Qiu,Chaorui Li
In this work, a novel Pb 2+ electrochemical DNAzyme sensor was developed for ultrasensitive detection of lead ions (Pb 2+ ) in water environment by coupling with the MoS 2 –AuPt nanomaterials and hemin/G-quadruplex DNAzyme, which acting as the electrocatalytic signal tag. Streptavidin (SA) modified tin dioxide-functionalized reduced graphene oxide (rGO-SnO 2 ) /gold nanoparticles (AuNPs) served as a sensor platform for enhancing conductivity and immobilizing more Pb 2+ -specific DNAzyme. In the presence of Pb 2+ , the Pb 2+ -dependent DNAzyme specifically reacted with Pb 2+ , cleaving the substrate strand (SS) into two free fragment and releasing the biotin-modified enzyme strand (Bio-ES) on the electrode. Connecting MoS 2 –AuPt nanocomposites labeled with G-rich DNA (G-DNA) strand and exposure of Bio-ES through the Helper DNA, as well as adding hemin to form a hemin/G-quadruplex, the biosensor achieved signal amplification . Chronoamperometry was used to record the current signal, which was primarily derived from the cocatalysis reduction of H 2 O 2 by MoS 2 –AuPt nanocomposites and the hemin/G-quadruplex. Under optimal conditions, the designed biosensor exhibited sensitive detection of Pb 2+ from 0.1 pg mL −1 to 1000 ng mL −1 , with a lower detection limit of 38 fg mL −1 (based on 3σ). This proposed biosensor is ultrasensitive and specific, representing a potential application for the detection of Pb 2+ in a water environment.
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Micro & Nano Letters
·
2018
·Vol. 13
·期 8
·1175-1178
·
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.
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TALANTA
·
2014
·
IF 3.511
Shijia Wu,Nuo Duan,Zhao Shi,Congcong Fang,Zhouping Wang
In this work, we presented a novel dual fluorescence resonance energy transfer (FRET) system for the simultaneous detection of Pb 2+ and Hg 2+ . This system employed two color upconversion nanoparticles (UCNPs) as the donors, and controlled gold nanoparticles (AuNPs) as the acceptors. The two donor–acceptor pairs were fabricated by hybridizing the aptamers and their corresponding complementary DNA. Thus, the green and red upconversion fluorescence could be quenched because of a good overlap between the UCNPs fluorescence emission and the AuNPs absorption spectrum. In the presence of Pb 2+ and Hg 2+ , the aptamers preferred to bind to their corresponding analytes and formed a G-quadruplexes structure for Pb 2+ and the hairpin-like structure for Hg 2+ . As a result, the dual FRET was disrupted, and the green and red upconversion fluorescence was restored. Under optimized experimental conditions, the relative fluorescence intensity increased as the metal ion concentrations were increased, allowing for the quantification of Pb 2+ and Hg 2+ . The relationships between the fluorescence intensity and plotting logarithms of ion concentrations were linear in the range from 0.1 to 100 nM for Pb 2+ and 0.5 to 500 nM for Hg 2+ , and the detection limits of Pb 2+ and Hg 2+ were 50 pM and 150 pM, respectively. As a practical application, the aptasensor was used to monitor Pb 2+ and Hg 2+ levels in naturally contaminated samples and human serum samples. Ultimately, this type of dual FRET could be used to detect other metal ions or contaminants in food safety analysis and environment monitoring.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Muhammad Yawar Younis,Wenting Li,Javed Khan,Yun Wei
A cost-effective and environmentally friendly composite hydrogel for the adsorption of Cd 2+ was fabricated by combining sodium alginate with lotus carbon dots (SA@lotus CDs). The impact of many factors, including doping amount, dose, pH, initial solution concentration, adsorption period, and temperature, on the process of Cd 2+ adsorption was studied. The adsorption isotherm was fitted well to the Langmuir isotherm model with high accuracy (R 2 = 0.9604). The adsorption kinetics conformed to the Pseudo-Second-Order kinetic model, demonstrating a high coefficient of determination (R 2 = 0.9238). The Langmuir model predicted that the adsorbent had adsorption capacity of 179.35 mg/g for Cd 2+ . After undergoing five cycles, the SA@lotus CDs continued to exhibit a removal effectiveness of 85.1 %. The SA@lotus CDs hydrogel composite was also used for the removal of Pb 2+ by 291.23 mg/g. The adsorption capability of the hydrogel was improved due to the addition of CDs. Pb 2+ was adsorbed by SA beads at 275.5 mg/g, while SA@lotus CDs had a slight increase to 291.23 mg/g (5.7 %). However, there was a 40.2 % increase in Cd 2+ adsorption from 127.89 mg/g by SA beads to 179.35 mg/g by SA@lotus CDs beads. The results of the adsorption tests showed the different removal efficiency of Pb 2+ and Cd 2+ by SA@lotus CDs. These findings suggested that SA@lotus CDs were more effective for removing Cd 2+ than Pb 2+ . The interaction mechanism between materials and metal ions was studied by using density functional theory. The interactions between CDs sites or SA sites and metal ions were calculated respectively. The results showed that the adsorption energy of CDs sites for metal ions was Cd 2+ < Cu 2+ < Pb 2+ < Fe 2+ < Co 2+ < Mg 2+ , while the adsorption energy of SA for Pb 2+ was much lower than that for Cd 2+ . Therefore, the affinity order of SA@lotus CDs for metal ions was Pb 2+ > Cd 2+ > Cu 2+ > Fe 2+ > Co 2+ > Mg 2+ , which was consistent with the experimental results.
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DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 36
·13841-13849
·
IF 4.052
Xiao-Shuo Wu,Yue-Rou Tang,Jian-Lan Liu,Lifeng Wang,Xiao-Ming Ren
New luminescent Pb(II)-coordination polymers (Pb(II)-CPs), [Pb(2-anc)2]n (1) and [Pb(3-qlc)2(H2O)2]n (2) (2-anc = 2-aminonicotinate, 3-qlc = 3-quinolinecarboxylate), were synthesized by a solvothermal reaction and characterized using microanalysis, IR spectrometry and thermogravimetric analysis. Single crystal structure analysis revealed that the Pb2+ ion displays a hemi-directed coordination geometry in 1 and a holo-directed coordination geometry in 2. The difference between the coordination spheres of 1 and 2 is related to the steric hindrance effect of the ligands. A two-dimensional (2D) corrugated layer structure is formed in 1, and the neighboring layers are further extended into a three-dimensional (3D) van der Waals crystal by π⋯π interactions between the pyridyl rings in the neighboring layers. In contrast, a one-dimensional (1D) coordination polymeric chain is formed in 2, and the adjacent chains are connected in a 2D network by hydrogen bonds. The photophysical properties of 1 and 2 were studied at ambient conditions, disclosing that 1 emits phosphorescence at 548 nm with a millisecond-scale emission lifetime and an absolute quantum yield of 2.2%; 2 emits only blue fluorescence with an absolute quantum yield of 3.5% and nanosecond-scale emission lifetime. The reasons for the difference in the photophysical nature of 1 and 2 are discussed in regards to the electron band structure and density of states analysis.
研究领域:
化学
·
材料科学
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.9
Mei Wang,Yingkuan Sun,Wei Shang,Yaqian Liu,Liying Jiang
Herein, a cost-effective and user-friendly electrochemical sensor was fabricated via a straightforward surface functionalization strategy using L-cysteine-functionalized NiFe 2 O 4 @NiCoFe LDH/MLG nanocomposites, specifically designed for on-site screening of Pb 2+ in Class III-V surface waters. The fabrication process involved the in-situ one-step hydrothermal growth of NiFe 2 O 4 @ternary NiCoFe layered double hydroxide (LDH) nanomaterials on a multilayer graphene (MLG) scaffold, followed by functionalization with L-cysteine (L-Cys) to yield the Cys/NiFe 2 O 4 @NiCoFe LDH/MLG/SPE sensor. Benefiting from the excellent electrical conductivity of MLG, the synergistic enhancement effect of the ternary LDH, and the multiple coordination active sites of L-Cys, the as-prepared sensor exhibits reliable sensing performance for Pb 2+ detection. Under optimal conditions, the sensor achieved a linear dynamic range of 0.1–3 mg/L and a limit of detection (LOD) of 30 μg/L, which is sufficient to discriminate Pb 2+ concentrations exceeding the regulatory threshold for Class III surface water (50 μg/L, GB 3838–2002). The sensor also demonstrated excellent selectivity against common coexisting ions (Co 2+ , Fe 3+ , Cu 2+ , and Zn 2+ ) and satisfactory repeatability (RSD = 4.42%). In real water sample analysis, recoveries ranged from 94.1% to 113%, confirming its practical applicability. Overall, the Cys/NiFe 2 O 4 @NiCoFe LDH/MLG/SPE composite electrode offers a cost-effective, robust, and operationally simple analytical platform, showing great promise for rapid on-site risk-level screening of Pb 2+ contamination in heavily impacted surface waters, particularly in resource-limited regions.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Ye Tang,Dongyan Li,Ziyin Lu,Yaxi Wang,Wenjie Liu,Guoxing Jing,Wen Liu,Jianna Yu,Wenshan Li
The severe toxicity of Pb 2+ to human health, even at trace levels, the development of highly sensitive and dependable analytical methods remains of great importance. Here, we developed a label-free and enzyme-free colorimetric method for Pb 2+ assay by integrating a GR-5 DNAzyme recognition event with a catalytic hairpin assembly (CHA)-hybridization chain reaction (HCR) cascade amplification. Upon exposure to Pb 2+ , the GR-5 DNAzyme is specifically activated, catalyzing the site-specific cleavage of hairpin H1 to release the initiator strand T. The liberated T strand subsequently drives the CHA and HCR cascade reactions, generating long DNA superstructures enriched with multiple G-rich sequences. In the presence of hemin, these G-rich sequences fold into catalytically functional G-quadruplex/hemin DNAzymes, which enable a visible colorimetric signal generation. Under optimized conditions, the proposed colorimetric method delivered a linear response over the range of 50 pM to 50 nM and achieved a limit of detection of 16.71 pM. The practical applicability of the method was further demonstrated through Pb 2+ analysis in drinking water and fish samples, where satisfactory accuracy and reliability were obtained. In addition, inductively coupled plasma mass spectrometry was employed to validate the real-sample results, and the two methods showed good consistency. Owing to its simplicity, high sensitivity, and enzyme-free design, this colorimetric method shows strong potential for practical Pb 2+ monitoring in food safety and environmental analysis.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Yingyun Luo,Zhuoya Meng,Jingwei Jiang,Yiyi Zhou,Yujia Chen,Ming Dong,Meiyi Xie,Peihan Xie,Mei Wang
A new electrochemical sensor based on a nanocomposites (Ce-MOF/Ti 3 C 2 ) synthesized by cerium-based metal-organic framework (Ce-MOF) and titanium carbide (Ti 3 C 2 ) was constructed. Ce-MOF/Ti 3 C 2 modified a glassy carbon electrode (GCE) to enable the individual or simultaneous trace detection of Cd 2+ and Pb 2+ by square wave anodic stripping voltammetry (SWASV). The morphology and composition of the composite were characterized using SEM, XPS and XRD, while its electrochemical performance was evaluated by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The developed sensor exhibited excellent performance, enabling simultaneous detection of Pb 2+ (8-500 μg/L) and Cd 2+ (10-500 μg/L), with detection limits of 1.02 μg/L and 2.5 μg/L, respectively, and also demonstrated good anti-interference capability, reproducibility and stability. This new method was successfully applied for the detection of Cd 2+ and Pb 2+ in river water and human urine samples, highlighting its potential for environmental and biological monitoring applications.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Xinran Yang,Zonglin Li,Junhui Du,Xueli Zhang,Haibin Liu,Xuechao Zhang,Lijun Li,Chuanjin Cui,Hongshuo Chen
In this paper, a SERS/electrochemical dual-channel aptamer biosensor was established for ultrasensitive detection of Pb 2+ . Firstly, the capture probe Fe 3 O 4 @Au@PAMAM@Aptamer and the signal probe AuNs@4-MBA@Au@ssDNA were chemically synthesized step by step. Secondly, the carboxyl graphene oxide (GO) was electrodeposited onto the electrode surface to gain the GO/SPCE. Meanwhile, PAMAM@Au nanomaterials were successfully synthesized and thus prepared the Aptamer/PAMAM@Au/GO/SPCE. During the process, SEM, TEM, FTIR and XPS were applied to characterize the synthesized nanomaterials which confirmed the successful synthesis of the nanomaterials. Finaly, the performance of this biosensor was evaluated in a series of Pb 2+ aqueous solutions by surface enhanced Raman (SERS) and differential pulse voltammetry (DPV). The results showed that the lowest limit of detection (LOD) was 3.16 × 10 −5 nM, and the sample recovery was 99.50–103.67 %. Furthermore, the biosensor demonstrated good specificity, repeatability, and stability. Reliable results were also obtained in actual sample testing. Therefore, it can provide a viable method for trace detection of heavy metal ions.
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ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Yanli Qi,Xiaolong Chen,Danqun Huo,Huan Liu,Mei Yang,Changjun Hou
Cd 2+ and Pb 2+ are two typical metallic pollutants in food. Therefore, it is of great significance to establish a method which can simultaneously detect them. Here, an electrochemical sensor was established to simultaneously detect Cd 2+ and Pb 2+ in food samples based on sensing electrode prepared by conductive carbon paper, rGO and CoZn·MOF (CP-rGO-CoZn·MOF). Under the optimized conditions, the proposed electrochemical sensor achieves simultaneous detection of Cd 2+ and Pb 2+ low to 0.565 nM (Cd 2+ ) and 0.588 nM (Pb 2+ ), respectively. Further selective experiments and repetitive experiments perform well. Spiked experiments find that the recovery rates of Cd 2+ and Pb 2+ in food samples are between 97.5% to 105.9% and 94.3%–109.6%, indicating the established electrochemical sensor owns a good response to the targets. Besides, relative standard deviations (RSD) of them are no more than 5.817%, showing its potential in practical applications.
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Analytical Methods
·
2022
·Vol. 14
·期 6
·643-651
·
IF 3.532
Jiahui Ji,Huifang Wu,Donghan Wang,Dan Liu,Xinyue Chen,Shilan Feng
In this study, a safe, rapid, and environment-friendly green synthesis of silver nanoparticles using the alcohol extract of Radix Hedysari (RH–AgNPs) was developed, the alcohol extract of Radix Hedysari (RH) acted as the reducing agent, stabilizer, and modifier. The main components of RH were determined using high-performance liquid chromatography (HPLC). The particle size and morphology of RH–AgNPs were optimized and characterized by a series of techniques. The size distribution, zeta potential, element distribution, and crystalline nature of RH–AgNPs were all determined. It was indicated that RH–AgNPs showed great sensitivity for lead ion (Pb2+) detection with a limit of detection (LOD) of 1.5 μM with a wide range of 10–500 μM. The selectivity was also explored for common metal ions. RH–AgNPs were then applied to the detection of Pb2+ in spiked Yellow River samples, and the possible mechanism is based on the crosslinking reaction between the hydroxide radical, carboxylate radical and Pb2+.
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高影响因子
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