ELECTROANALYSIS
·
2026
·Vol. 38
·期 1
·e70099
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IF 2.3
Yang Chen,Xuening Wang,Huimin Si,Zhiping Sun,Qianyun Yu,Xihong Song,Ying Liu,Chuanbo Yan,Kai Yu
The increasing heavy metal pollution in marine environments has highlighted the urgent need for rapid, on-site detection methods. In this study, a reduced graphene oxide (rGO) and carboxylated multiwalled carbon nanotube (MWCNTs-COOH)-modified screen-printed electrode (SPE) was coupled with a portable electrochemical workstation for on-site detection of Pb 2+ and Cd 2+ in seawater. The key influencing factors involved in the detection process, such as deposition potential, deposition time, and pH value, have been systematically optimized. The response surface methodology (RSM) was applied to refine the portable electrochemical workstation parameters, including step potential, frequency, and pulse amplitude. The detection capability for heavy metals was significantly enhanced by using square wave stripping voltammetry (SWASV) with in situ Hg-Bi film plating, achieving detection limits of 0.4 μg/L for Pb 2+ and 0.8 μg/L for Cd 2+ . Finally, the portable workstation together with rGO/MWCNTs-COOH/SPE showed recovery rates of 101.33 ± 3.42% ~ 115.85 ± 3.50% for Pb 2+ and 101.32 ± 2.23% ~ 102.00 ± 2.00% for Cd 2+ in real seawater. The results were in good agreement with those obtained by inductively coupled plasma mass spectrometry (ICP-MS), thereby validating the detection accuracy of this platform.
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Advanced Optical Materials
·
2022
·Vol. 10
·期 10
·2102200
·
IF 10.05
Chong Zhao,Yingkui Li,Wanggui Ye,Xiaofei Shen,Zicheng Wen,Xuanyi Yuan,Yongge Cao,Chaoyang Ma
Colloidal all-inorganic lead halide perovskite nanocrystals (LHP NCs) feature with tunable high-efficiency photoluminescence from blue to red for optoelectronic applications but suffer from instability under water moisture, UV light illumination, high-temperature shock, as well as oxygen erosion. Previous work to improve LHP NCs stability was mainly focused on either glass bulk sealed LHP quantum dots (QDs) with low quantum efficiency, or mesoporous silica matrixes confined LHP QDs with organic ligands still existing. Here, a facile, noncolloidal, ligand-free LHP QDs growth with physical confinement is proposed by integrating the growth of perovskite QDs with the fabrication process of hydrophobic silica-aerogel powders (SAPs). As a result, the as-synthesized mono- and mixed-cesium-lead-halide QDs @ SAPs composites show tunable photoluminescence from purple to deep red. Besides, the Pr 3+ ions doped CsPbBr 3 QDs @ SAPs composites exhibit moderate quantum efficiency, excellent stability under UV illumination, water moisture as well as temperature variation. Furthermore, performances of white LED device encapsulated Pr 3+ doped composite with blue GaN chip and commercial red (Sr, Ca)AlSiN 3 :Eu 2+ phosphor are evaluated. This work demonstrates a facile and general strategy for synthesizing high-stable all-inorganic cesium-lead-halide QDs for applications in white LED and display devices.
研究领域:
材料科学
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光电技术
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纳米技术
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光子学
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Yi-Xi Chen,Zhenhua Tang,Le-Yan Feng,Liu-Ling Liang,Deng-Hui Shang,Hui-Qing Li,Xiao-Hai Chen,Feng-Ming Li,Xin-Gui Tang,Shang-Xian Chen
Nowadays, heavy metal pollutants have emerged as a significant global environment affecting human health. Herein, in this work, a highly sensitive and selective dual-signal ratiometric fluorescent sensor for heavy metal Pb 2+ ions detection in aquatic environments was developed by employing the combined highly fluorescent nitrogen and sulfur co-doped carbon dots (N,S-CDs) with rhodamine B (RhB) as a new dual-signal fluorescent probe. The nanostructure, optical properties and a self-calibration mechanism based on the intensity ratio of dual emission peaks were discussed, and, the co-doping of nitrogen and sulfur increased the electron transfer rate and enhanced the coordination interaction between the N,S-CDs and Pb 2+ ions were revealed in the dual-signal ratiometric fluorescent sensor. Moreover, the new sensor exhibited a robust linear response to Pb 2+ ions within the 0–180 μM range, achieving a limit of detection (LOD) of 0.45 μM (93 μg/L) in the actual measurement environment, which is observed to be commensurate with the Grade I standard limit for lead as prescribed in China's “Integrated Wastewater Discharge Standard” (100 μg/L). Furthermore, specificity experiments demonstrated the sensor's superior recognition of Pb 2+ ions over other common metal ions (e.g., Cu 2+ , Fe 3+ , Al 3+ ). In practical industrial wastewater analysis, spike recoveries of 94.20–97.53 % were achieved, with relative standard deviations (RSDs) below 1.32 %, thus validating the method's reliability. This work has been recognized to provide significant potential for environmental monitoring applications.
研究领域:
环境监测
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分析化学
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纳米材料
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传感器与生物传感器
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水质检测
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PubMed
高影响因子
Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 36
·5502-5509
·
IF 5.047
Yifang Gao,Yuan Jiao,Huilin Zhang,Wenjing Lu,Yang Liu,Hui Han,Xiaojuan Gong,Lei Li,Shaomin Shuang,Chuan Dong
Herein, an easy and effective ratiometric fluorescent nanoprobe for the selective detection of Pb2+ and pyrophosphate (PPi) was developed based on label-free carbon dots (CDs). The CDs showed dual emission bands at 477 and 651 nm under a single-wavelength excitation (391 nm). Pb2+ and PPi were sequentially detected by the sensor with high reliability and accuracy via the exploitation of the fluorescence intensity ratio (F477/F651). The dual emission sensor exhibited high selectivity and excellent sensitivity for Pb2+ and PPi than for other analytes with detection limits as low as 0.055 μM and 0.089 μM, respectively. Moreover, the fluorescent CDs changed from pink to cyan and from cyan to pink and could be used as a fluorescent paper sensor for the visual detection of Pb2+ and PPi. To the best of our knowledge, this is the first report on the ratiometric fluorescence detection of Pb2+ and PPi by CDs; therefore, the as-synthesized CDs show great potential for application in the determination of Pb2+ and PPi in real samples.
研究领域:
分析化学
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生物传感
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环境监测
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材料科学
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荧光探针
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高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Wei Ruan,Haoyun Liu,Hao Wu,Yuan Qi,Mengchang Zhou,Changsong Zhou,Zhen Zhang,Hongmin Yang
In this work, the Zr-based MOF was successfully fabricated with 4,6-Diamino-2-mercaptopyrimidine (DMP) and a novel adsorbent (Uio-DMP) was synthesized for the immobilization of Pb 2+ in aqueous medium . The morphological and structural characteristics of Uio-DMP were characterized by X-ray diffractometer (XRD), Fourier transform infrared (FT-IR), Field emission scanning electron microscopy (FE-SEM), Brunner Emmet Teller (BET), and X-ray photoelectron spectroscopy (XPS). The characterization results showed that the Uio-DMP maintained a pristine crystal structure and the sulfhydryl group was introduced to Zr-based MOF after chemical functionalization. The adsorption behavior of Uio-DMP for Pb 2+ was investigated in different conditions (solution pH, sorbent dose, Pb 2+ concentration, adsorption time, and co-existing ions). The experimental results indicated that the optimal pH was 6, the maximum adsorption capacity was 296.5 mg/g, and the Langmuir model well fitted the Pb 2+ removal process based on adsorption isotherm studies. The adsorption kinetic experiments revealed that the adsorption equilibrium could be achieved at 30 min and the adsorption process was consistent with the Pseudo-second-order model. The co-existing ions had a limited impact on Pb 2+ removal and the removal rate of 71.0% was maintained after five consecutive adsorption-desorption experiments. Furthermore, zeta potential and XPS analysis proved that the removal process of Pb 2+ over Uio-DMP was affected by electrostatic interaction , and nitrogen/sulfur atoms acting as the main adsorption sites. This study provides an insight into the removal of Pb 2+ in aqueous medium and the functionalization of adsorbents.
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Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Siyi Zhang,Kamile Arkin,Yuxin Zheng,Jicheng Ma,Yuyang Bei,Di Liu,Qingkun Shang
In this paper, an environmentally friendly, visible and easy-to-recycle spherical adsorbent (SA@PEI-CDs, SA : sodium alginate, PEI: polyethyleneimine, CDs : carbon dots) has been prepared from functionalized positively charged biomass carbons dots (PEI-CDs) and anionic polyelectrolyte sodium alginate (SA) through electrostatic self-assembly. SA@PEI-CDs can efficiently and preferentially adsorb Pb 2+ . Compared to bare SA, the adsorption capacity of SA@PEI-CDs increased from 206.93 mg/g to 380.39 mg/g (at pH=4), which enhanced 83.82%. It can still maintain 85.67% of the original adsorption capacity after five cycles. The quenching of the blue fluorescence of the adsorbent derived from carbon dots indicates that the adsorption process has reached saturation. The investigation about the adsorption isotherm models, kinetics and thermodynamic parameters reveals that the adsorption process follows Freundlich isotherm model based on chemical adsorption , which is an endothermic spontaneous reaction with an increase in entropy. The possible adsorption mechanism is electrostatic attraction, ion exchange, and together with the coordination of -NH 2 , -OH, -COOH with Pb 2+ . In addition, the extremely easy-to-recycle spherical adsorbent is also used in the multi-layer adsorption and separation of simulated sewage samples in the water purifier model. For simulated water samples whose concentration of five/three types of heavy metal ions exceeds 100 times the standard, after using adsorbent SA@PEI-CDs for two or three consecutive adsorptions, the content of heavy metals decreases rapidly, which is far below the limit value of high-quality water. The Pb 2+ ion concentration decreased from 1.0 mg/L to 0.002540 mg/L and 0.003611 mg/L, respectively.
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Environmental Technology & Innovation
·
2025
·
IF 7.1
Yu He,Suqing Liu,Yan Zhou,Junping Wang
At present, with the development of society, different enterprises inevitably produce industrial wastewater and waste residue containing lead and copper. Therefore, there is an urgent need for a rapid and simple method to detect lead and copper in pollutants. In this paper, a metal-organic framework (MOF) doped with Eu(Ⅲ) (Eu 3+ /UiO-66-NH 2 ) was successfully prepared by one-pot hydrothermal technique. The probe is capable of detecting Pb 2+ and Cu 2+ with high sensitivity. Pb 2+ and Cu 2+ have detection ranges of 5–340 μM and 0.01–200 μM, respectively. The detection limit for Pb 2+ was as low as 1.01 μM, and the detection limit for Cu 2+ was 6.46 μM. This approach has a good detection performance when compared to the method described in the literature. It shows that the prepared sensor has great potential in the detection of actual lead and copper, and provides a practical and effective method for rapid and accurate detection of heavy metal ions.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2026
·
IF 6.1
Ya Liu,Jiayi Hu,Huiqiong Huang,Xiaofang Yang,Xin Liu,Ning Lu,Shengchun Yang,Xiaodong Wen
Background Lead (Pb 2+ ) is a persistent and non-degradable pollutant that poses serious threats to human health and food safety. However, conventional methods are often limited by matrix interferences, sensitivity, and selectivity pose significant challenges for the direct quantification of trace metal ions in complex samples. Therefore, the development of efficient sample pretreatment techniques is necessary to address these limitations and enable reliable quantification of trace Pb 2+ in food and environmental samples. Results A novel method for the separation and enrichment of trace Pb 2+ in Angelica sinensis (Oliv.) Diels (AS) and water samples was developed, using a newly synthesized pH-responsive amorphous MIL-68(In)–NH 2 –TiO 2 (aMIL-68(In)–NH 2 –TiO 2 ) composite prepared with green deep eutectic solvents as a dispersive micro solid-phase extraction (DMSPE) adsorbent. At pH = 3, the composite showed excellent selectivity for Pb 2+ adsorption in multi-metal ion systems and achieves adsorption equilibrium within 3 min, providing a practical improvement over conventional extraction process and enhancing overall experimental efficiency. Under the optimized conditions, the method showed efficient extraction of Pb 2+ with an enrichment factor of 31, a limit of detection (LOD) of 0.1 μg L −1 , and a wide linear range (1–6000 μg L −1 ). Significance In this work, aMIL-68(In)–NH 2 –TiO 2 was prepared as a DMSPE adsorbent for the environmentally friendly, highly sensitive, and highly selective monitoring of trace Pb 2+ in AS and water samples, providing a novel strategy for the sensitive detection of metal ions, offering a promising approach for food and environmental monitoring.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yujin Xing,Shicheng Liu,Wenzhong Wang,Yujie Liang,Junli Fu,Qing Zhou,Lijuan Wang,Shimeng Huang
This study demonstrates for the first time the potential of the novel combination of aluminum (Al) doping and amino functionalization to drastically enhance the adsorption capacity of nanosheet-assembled hierarchical calcium silicate hydrate (CSH) architectures for heavy metal Pb 2+ and Cu 2+ ions in aqueous solution. The designed and prepared amino-functionalized Al-doped CSH (CASH-NH 2 ) exhibits excellent adsorption capability to adsorb Pb 2+ and Cu 2+ ions. The maximum adsorption capacity of Pb 2+ and Cu 2+ ions is 911 and 509 mg g −1 , respectively, which is much higher than that of pure CSH and other relative CSH-based adsorbents. The experimental measurements of cation exchange capacity (CEC) and surface composition discover that the adsorption of Pb 2+ and Cu 2+ ions on CASH-NH 2 is preponderantly achieved by the cation exchange and surface complexation, in which Al doping substantially enhances the exchange capacity between Ca 2+ of CSH and Pb 2+ or Cu 2+ , and the functional amino groups chelate Pb 2+ or Cu 2+ to realize surface complexation of CASH architectures. Thereby the excellent adsorption performance of CASH-NH 2 is attributed to the significant enhancement in the CEC between Ca 2+ of CASH and Pb 2+ or Cu 2+ , and the amino functionalization-induced surface complexation of the CASH, which are achieved by the synergistic effect of Al doping and amino functionalization. This work opens a new way for simultaneously exploiting metal doping and amino functionalization to boost the adsorption performance of other adsorbents to achieve highly efficient removal of toxic cationic species from polluted water.
研究领域:
环境科学
·
材料科学
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Jiangbo Dong,Li Wen,Dong Zhao,Huisi Yang,Jiaying Zhao,Zhikun Hu,Yi Ma,Changjun Hou,Danqun Huo
The widespread heavy metal pollution endangers human health; hence, accurate on-site detection and quantification of heavy metal content in the surroundings is a vital step in reversing the harmful effect. Herein, an electrochemical sensor based on flexible cerium metal–organic framework@multi-walled carbon nanotubes/carbon cloth (CeMOF@MWCNTs/CC) was constructed for simultaneous on-site detection of Cd 2+ and Pb 2+ in food and water samples. The rich carboxyl groups of MWCNTs provided abundant sites for the adsorption of Cd 2+ and Pb 2+ , and the mutual conversion of Ce 3+ and Ce 4+ in CeMOF facilitated the reduction and reoxidation of metal ions. The prepared electrode showed excellent performance in the simultaneous measurement of Cd 2+ and Pb 2+ , with detection limits of 2.2 ppb and 0.64 ppb, respectively. More importantly, the sensing platform has been successfully used to detect simultaneously Cd 2+ and Pb 2+ in grain and water samples, and the detection results were consistent with the standard methods, showing great potential in environmental monitoring and food safety.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Meiling Long,Yue Liu,Jun Yang,Shaogui Wu
Biomass-derived B-CDs were synthesized from Mahonia fortunei fruits. • The B-CDs showed bright blue emission with a quantum yield of 31.1%. • Pb 2+ selectively quenched B-CD fluorescence with a low LOD of 26 nM. • L-Histidine restored fluorescence via competitive Pb 2+ coordination. • An IMPLICATION logic gate was constructed from the on–off–on response. Nitrogen-doped carbon dots (B-CDs) with deep-blue fluorescence were synthesized through a one-step hydrothermal route using the fruits of the medicinal plant Mahonia fortunei as the biomass carbon source and 1-naphthylamine as the nitrogen dopant. The resulting B-CDs showed excitation-independent emission, a high fluorescence quantum yield of 31.1%, and excellent resistance to salt, photobleaching, and long-term storage. Pb 2+ efficiently quenched B-CD fluorescence by forming non-emissive ground-state complexes through bidentate coordination with oxygen- and nitrogen-containing surface groups, switching the probe to the “off” state. By contrast, L-histidine (L-His), whose imidazole group has stronger competitive affinity for Pb 2+ , dissociated the carbon dot‑lead complexes and markedly restored fluorescence, returning the system to the “on” state. The platform afforded a detection limit of 26 nM for Pb 2+ , while the L-His-induced fluorescence recovery response was linear over 40–80 μM, with an average fluorescence recovery efficiency of 88.2%. On the basis of this reversible fluorescence response, an IMPLICATION molecular logic gate was constructed using Pb 2+ and L-His as chemical inputs and fluorescence intensity as the output, enabling logic discrimination in a two-component system. UV–vis absorption spectroscopy, time-resolved fluorescence lifetime analysis, and FT-IR spectroscopy jointly supported the reversible “on-off-on” response mechanism. This work provides a practical strategy for developing natural plant-derived carbon-dot platforms for reversible fluorescence sensing and molecular logic devices. Download: Download high-res image (155KB) Download: Download full-size image
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Huan Liu,Donglin Tian,Mize Ouyang,Zhiqiang Qian,Xiaodong Wang
Contamination and waste heat are major issues in water pollution. Aiming at efficient synchronous recovery wastewater and waste heat, we designed a novel CaCO 3 -based phase-change microcapsule system with an n -docosane core and a CaCO 3 /Fe 3 O 4 composite shell. The system was fabricated through an emulsion-templated in situ precipitation approach in a structure-directing mode, resulting in a controllable morphology for the resultant microcapsules, varying from a peanut hull through ellipsoid to dumbbell shapes. The system has a significantly enlarged specific surface area of approximately 55 m 2 ·g −1 with the CaCO 3 phase transition from vaterite to calcite. As a result, the microcapsule system exhibits improved adsorption capacities of 497.6 and 79.1 mg/g for Pb 2+ and Rhodamine B removal, respectively, from wastewater. Moreover, increase in the specific surface area of the microcapsule system with a sufficient latent heat capacity of approximately 130 J·g −1 also resulted in an enhanced heat energy-storage capability and thermal conductance for waste-heat recovery. The microcapsule system also exhibits a good leakage-prevention capability and good multicycle reusability owing to the tight magnetic CaCO 3 /Fe 3 O 4 composite shell. This study provides a promising approach for developing CaCO 3 -based phase-change microcapsules with enhanced thermal energy storage and adsorption capabilities for efficient synchronous recovery of wastewater and waste heat.
研究领域:
环境科学
·
材料科学
·
化学工程
·
可持续能源
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高影响因子
危险品化学品经营许可证（带存储）