ANALYTICA CHIMICA ACTA
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2026
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IF 6.1
Qing Li,Yage Guan,Qian Wang,Daxiang Gui,Yingqiang Fu
s Background 2,4-Dichlorophenoxyacetic acid (2,4-D) is a widely used herbicide whose environmental residues pose threats to ecology and health. Copper ions (Cu 2+ ), as common heavy metal pollutants, can exhibit synergistic toxicity with 2,4-D, exacerbating environmental risks. Traditional single-emission fluorescent probes are typically limited to detecting a single target or operating in a single mode, making it challenging to achieve simultaneous monitoring of multiple pollutants. Therefore, developing novel multifunctional fluorescent probes capable of concurrently detecting both Cu 2+ and 2,4-D holds significant importance. Results This work successfully synthesized Rhodamine-modified carbon quantum dots (R-CQDs) via a one-step hydrothermal method. The material exhibits dual emission fluorescence peaks at 464 nm and 544 nm. Cu 2+ selectively quenches the 464 nm fluorescence, while 2,4-D restores fluorescence intensity by competing with Cu 2+ for coordination via its carboxyl group. The detection limits for Cu 2+ and 2,4-D are 2.71 × 10 −3 μM and 1.86 × 10 −3 μM, respectively. Further integration with a smartphone platform combined photocurrent sensing and fluorometric colorimetry, enabling expansion to visual, portable triple-mode (fluorescence, photocurrent, colorimetry) detection. Detection limits for Cu 2+ and 2,4-D reached 0.01382 μM and 0.01925 μM, respectively. This achieved highly sensitive and selective cascade detection of 2,4-D and Cu 2+ . Significance: This multi-signal complementary strategy significantly enhances interference resistance and reliability, providing a portable, low-cost, and universal solution for on-site and rapid monitoring of heavy metal and pesticide residues in environmental and food matrices.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Shuyu Yang,Chasina,Zhaomeng Liu,Lingxiao Bao,Xiangtai Meng,Tingting Yang,Yang Liu,Yang Yang,Yilin Luo,Ying Liu,Wenlong Chen,Xiaowei Zhu,Jinrong Bao
Core-shell-shell SiO 2 @LaVO 4 :RE@SiO 2 -MABA-Si microspheres enable dual-probe Hg 2+ /Cu 2+ detection. • Detection limits of 0.14 µM for Hg²⁺ and 92.96 nM for Cu 2+ with 8–20 min response time. • IFE coupled with coordination governs selective quenching of Eu 3+ (616 nm) and Tb 3+ (543 nm) emission. • Robust performance across pH 3.0–12, 7 days stability, and 98–103.83% real-water recoveries. A dual-channel sensing system based on core-shell-shell SiO 2 @LaVO 4 :RE@SiO 2 -MABA-Si (RE = Eu, Tb) microspheres was developed for the selective detection of Hg 2+ and Cu 2+ in aqueous media. The microspheres were synthesized by grafting MABA-Si onto SiO 2 @LaVO 4 :RE@SiO 2 , yielding a triple-layered architecture (~105 nm SiO 2 core, ~4 nm LaVO 4 :RE luminescent shell, ~14 nm SiO 2 -MABA-Si functional shell). Sensing relies on the inner filter effect (IFE) coupled with synergistic coordination: MABA-Si captures Hg 2+ or Cu 2+ , and the resulting metal-ligand complexes quench the Eu 3+ (616 nm) or Tb 3+ (543 nm) emission, respectively. The Tb 3+ -based probe detected Cu 2+ with a limit of 92.96 nM and an 8 min response, while the Eu 3+ -based probe detected Hg 2+ with a limit of 0.14 μM and a 20 min response. The Hg 2+ system showed reversible "on-off-on" switching with L -cysteine. The SiO 2 shell maintained stable luminescence over pH 3.0 −12 and 7 days storage. Real water tests gave recoveries of 99 −103.83% (Hg 2+ ) and 98 −102.50% (Cu 2+ ) with RSDs below 2.4%. This platform offers a practical approach for dual-ion heavy metal monitoring. Download: Download high-res image (253KB) Download: Download full-size image
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Hao Zhan,Wenlong Chen,Xingyu Pei,Hao Wang,Bing Zhao,Xiefei Wang,Qingqing Liang,Yukang Xu,Weiwei Zhu
Highly diffuse cationic dyes and copper ions are normal pollutants in dye wastewater and pose a potential ecological risk, threatening human health. However, current MOF-based fibrous composites usually scarify their stability of active sites for photocatalytic reaction, which inevitably causes nondurable removal of these diffuse particles. Here, an in situ growth strategy was proposed to fabricate robust core-shell heterostructure of ZnO@ZIF-8 nanorods which were anchored within polytetrafluoroethylene (PTFE) micro-scale fibers by the solution-blowing spinning (SBS) technique to achieve ZnO@ZIF-8/PTFE hierarchical fibrous networks (ZZP-HFN). It presents superior degradation of cationic dyes (over 97%) and durable decompose stability of more than 20 cycles, and prominent adsorption capacity for copper ions (86.53 mg/g). Moreover, contrast to the existing MOF-based fibrous membranes, ZZP-HFN exhibits the self-cleaning performance on account of its stable composite structure between ZnO@ZIF-8 nanorods and PTFE fiber. The cationic dyes removal of ZZP-HFN from wastewater is attributed to the synergistic effect of adsorption and photocatalytic ability. This work provides an insight to design advanced MOF-based composites with durable photocatalytic performance for dye wastewater purification.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2026
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IF 5.9
Yanhong Zhang,Liulu Liu,Nanke Ma,Lixia Xie,Yuan Jin,Guangli Li
PNHC@Pt/TiO₂ core–shell heterojunction for trace Cu²⁺ monitoring. • N/P doping & O defects boost Cu²⁺ coordination and enrichment. • Low LOD 0.006 µM, wide linear range 0.001–20 µM. • Excellent selectivity against multiple coexisting heavy metal ions. • Reliable recoveries (87.1–103.3%) in tap water, soil, serum. Copper ion (Cu 2+ ) is a prevalent heavy metal contaminant in industrial wastewater and natural water bodies. Although it plays a vital role as a trace element in human physiology, overconsumption can result in severe systemic disorders. In this work, a novel electrochemical sensing platform based on P, N co-doped hollow carbon (PNHC) decorated with Pt/TiO 2 nanoparticles (PNHC@Pt/TiO 2 ) was developed for the ultrasensitive detection of Cu 2+ . The composite was systematically characterized by SEM, TEM, XRD, FTIR, Raman spectroscopy, and XPS, confirming the formation of a core-shell structure with a uniform spherical morphology (104.20 ± 0.21 nm), along with N/P heteroatoms that provide specific coordination affinity toward Cu 2+ . Compared to bare and single-component electrodes, the PNHC@Pt/TiO 2 -modified GCE delivered an enlarged electroactive surface area (0.1289 cm 2 ) and lower charge-transfer resistance; under the optimized parameters (pH 5.0, accumulation potential −0.8 V, accumulation time 180 s, and modifier volume 5 µL), this sensor presented a Cu 2+ linear detection range of 0.001–20 µM, a low limit of detection (LOD) of 0.006 µM (S/N = 3), and a high sensitivity of 6.102 µA µM −1 . The sensor also exhibited excellent selectivity against common interfering ions (K + , Na⁺, Ni 2+ , Co 2+ , Zn 2+ , Cd 2+ ), good reproducibility, and long-term stability (83.7% current retention after 8 days). Practical applicability was validated by successful determination of Cu 2+ in tap water, soil, and serum samples with recoveries ranging from 87.1% to 103.3%, demonstrating the reliable performance of the proposed sensor for environmental and biological monitoring.
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Journal of Energy Chemistry
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2026
·
IF 15.6
Xingyang Wu,Yucui Xiang,Liyong Gan,Shuaijun Wang,Zhongkai Hao,Guo Qin Xu,John Hon Kay Yip
Selective solar-driven conversion of CO 2 into C 2 hydrocarbons under aqueous conditions is a promising route toward carbon neutrality. However, C 2 selectivity in water is severely constrained because the intrinsically slow C–C coupling requires sustained electron flux to build up coupling-relevant intermediates. This flux is readily depleted by the competing hydrogen evolution reaction and rapid carrier recombination. Here, we construct an in situ S-scheme heterojunction of CuO islands on two-dimensional (2D) N-TiO 2 (CuO/N-TiO 2 ) via a one-pot solvothermal strategy. The chemically anchored CuO islands on 2D N-TiO 2 nanosheets create a compact, coherent interface that facilitates interfacial charge transfer. Compared with an ex situ assembled counterpart, the in situ heterojunction shows more efficient S-scheme charge separation. In situ characterizations and theoretical calculations reveal that dynamically redox-cycling Cu 2+ /Cu + sites are beneficial for C 2 H 4 formation, with Cu + sites favoring *CO retention and Cu 2+ sites being more favorable for the subsequent asymmetric *CO–*CHO coupling step. Consequently, the as-prepared catalyst delivers 17.5 μmol g −1 ethylene in 4 h with 94.6% selectivity and robust cycling stability. This work establishes an in situ S-scheme heterojunction with oxide islands anchored on 2D nanosheets that integrates charge management with dynamic active sites for selective aqueous CO 2 -to-C 2 H 4 photoreduction. An in situ grown CuO-islands/2D N-TiO 2 S-scheme heterojunction promotes charge separation for aqueous CO 2 -to-C 2 H 4 photoreduction without sacrificial agents. The dynamic Cu 2+ /Cu + active sites favor *CO formation, asymmetric *CO–*CHO coupling, and ethylene selectivity. Download: Download high-res image (161KB) Download: Download full-size image
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Micromachines
·
2023
·Vol. 14
·期 5
·902
·
IF 3.4
Yong Xie,Chao Bian,Mingjie Han,Ri Wang,Yang Li,Yuhao Xu,Shanhong Xia
A highly sensitive and accurate dual-signal strategy is developed for trace Cu2+detection based on the inner filter effect (IFE) between Tween 20-gold nanoparticles (AuNPs) and CdSe/ZnS quantum dots (QDs). Tween 20-AuNPs are utilized as colorimetric probes and excellent fluorescent absorbers. The fluorescence of CdSe/ZnS QDs can be quenched efficiently by Tween 20-AuNPs via IFE. In the presence of D-penicillamine, D-penicillamine induces the aggregation of Tween 20-AuNPs and the fluorescent recovery of CdSe/ZnS QDs at high ionic strength. Upon addition of Cu2+, D-penicillamine tends to selectively chelate with Cu2+and then forms the mixed-valence complexes, which consequently inhibits the aggregation of Tween 20-AuNPs and the fluorescent recovery. The dual-signal method is used to quantitatively detect trace Cu2+, with low detection limits of 0.57 μg/L and 0.36 μg/L for colorimetry and fluorescence, respectively. In addition, the proposed method using a portable spectrometer is applied to the detection of Cu2+in water. This sensitive, accurate and miniature sensing system has potential in environmental evaluations.Keywords:fluorescence;colorimetry;copper;CdSe/ZnS quantum dots;gold nanoparticles;inner filter effect
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Surfaces and Interfaces
·
2023
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IF 6.2
Diandi Li,Haijun He,Zhongxuan Xu,Hong Deng
Coexistence of chromium and iron, manganese and copper in industries is common, which may affect the microbial treating efficiency and toxicity to microorganisms, thus restricting the application of microbial treatment technology. In this research, Cu 2+ promoted the reduction of Cr(VI) and the fixation of total chromium in bimetallic systems for both Shewanella oneidensis MR-1 and Bacillus subtilis , while Mn 2+ and Fe 3+ exhibited inhibition effects. Generally, groups with coexisting heavy metal of 0.1 mM were most affected, no matter promotive or inhibitive. Toxicity analysis revealed that high concentration of heavy metal ions led to damage to the cell membranes and reduction of their survival rate. To clarify the optimal condition for microbial treatment, response surface methodology was used to investigate the influencing factors of Cr(VI) reduction by S. oneidensis . The total chromium concentration in the supernatant was correlated with three factors, and the significant order of influence was: culture time > culture temperature > pH.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Xiaoci Cui,Yingying Zhang,Zhiyuan Chen,Huining Xiao,Ranhua Xiong,Chaobo Huang
Water and soil pollution caused by Cu 2+ is not conducive to sustainable development of environment and could cause damage to environment and even human body. Currently, fluorescent sensor solutions analysis method has been used for Cu 2+ detection, but they also suffer from drawbacks including easy leakage, difficult storage, and inaccurate. Herein, a green solid-state biomass fluorescence platform (NBU-CDs) consisting of xylan-derived carbon dots (U-CDs) and polylactic acid/polycaprolactone (PLA/PCL) was designed by using in situ electrospinning technology. The prepared NBU-CDs fluorescence platform showed good fluorescence effect and can be served as fluorescence sensor for detecting Cu 2+ with high sensitively, selectively and low detection limit (LOD = 0.83 μM). The practical applications of NBU-CDs exhibited high specificity for Cu 2+ detection in zebrafish, water samples (school lake, Xuanwu Lake and Yangtze River) with high recovery rates of 97 %–104 % and soil (pond soil, grassland soil and bamboo soil) samples, respectively. The developed fluorescence platform was utilized to predict water and soil safety by monitoring Cu 2+ concentration and provides a new strategy for Cu 2+ detection.
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INORGANICA CHIMICA ACTA
·
2022
·
IF 3.118
Wei Wang,Jing-Zhe Li,Shi-Jian Luo,Zi-Xuan Yao,Kuan-Guan Liu
Using the atomic precisely structurally characterized clusters as electrocatalysts can provide some possible structure information about the active intermediate during the electrocatalytic N 2 reduction reaction (NRR) process. A Cu4 cluster, named [(bpy) 4 Cu 4 (C 10 H 8 SO 3 ) 4 (OH) 4 ]•4H 2 O ( 1 ), has been synthesized and fully characterized by IR, SXRD, XPS, EPR, et al. Single crystal structural analysis reveals that the core structure of the cluster has a step-scheme conformation with two μ 2 -OH and two μ 3 -OH groups. Electro-catalysis studies of this cluster show that it can achieve a highest NH 3 yield of 2.18 μg h −1 mg −1 and a FE of 0.97 % at −0.6 V. The excellent NRR performance may be attributable to the additional μ 3 -OH groups, based on the contrastively study of the other electrocatalysts of the Cu powder and the Cu 2 complex, named [(μ 2 -OH)(μ 2 -Cl)(bpy) 2 Cu 2 Cl 2 ] ( 2 ), with one μ 2 -OH group in its structure. This work provides some structure information about the possible active sites during the NRR process and inspires us to develop new cluster as efficient electrocatalysts for advancing sustainable NH 3 production. Using the atomic precisely structurally characterized clusters as electrocatalysts can provide some possible structure information about the active intermediate during the electrocatalytic N 2 reduction reaction (NRR) process. A Cu4 cluster, named [(bpy) 4 Cu 4 (C 10 H 8 SO 3 ) 4 (OH) 4 ]•4H 2 O ( 1 ), has been synthesized and fully characterized by IR, SXRD, XPS, EPR, et al. Single crystal structural analysis reveals that the core structure of the cluster has a step-scheme conformation with two μ 2 -OH and two μ 3 -OH groups. Electro-catalysis studies of this cluster show that it can achieve a highest NH 3 yield of 2.18 μg h −1 mg −1 and a FE of 0.97 % at −0.6 V. The excellent NRR performance may be attributable to the additional μ 3 -OH groups, based on the contrastively study of the other electrocatalysts of the Cu powder and the Cu 2 complex, named [(μ 2 -OH)(μ 2 -Cl)(bpy) 2 Cu 2 Cl 2 ] ( 2 ), with one μ 2 -OH group in its structure. This work provides some structure information about the possible active sites during the NRR process and inspires us to develop new cluster as efficient electrocatalysts for advancing sustainable NH 3 production.
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EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Huimin Duan,Lijie Yin,Tao Chen,Dongming Qi,Dongyue Zhang
The interaction between heavy metal ions (e.g. Cu 2+ , Pb 2+ , Cr 6+ ) and bioactive biomolecules can severely cause the “poisoning behavior” due to the secondary structure transition. While in a bioinspiration strategy, functional polymers with the ability of selectively responding to metal ions can be used as effective probe candidate for metal ion detection. Herein, a series of functional substituted polyacetylenes with glycine pendants (P-Gly-NH 2 ) are deliberately designed and synthesized as a fresh member of polymeric probe arsenal for selective ions recognition. According to chemical and structural characterization including FT-IR, NMR, GPC, UV–vis and so on, the synthesized P-Gly-NH 2 polymers with glycine amide pendants possess random coil conformation on the conjugated main chains. Benefit from remarkable water-soluble ability and secondary structure, P-Gly-NH 2 can simulate the biomolecules and apply for heavy metal ions detection in aqueous solution. Because of the complexing interaction with Cu 2+ , the particular “random coil to helical” conformation transition of P-Gly-NH 2 backbone can be observed by UV–vis characterization in ion recognition experiments. Moreover, the relevant results of ions interfering and titration experiments also confirm that this selective detection towards Cu 2+ exhibits an outstanding time-efficiency and reliability with the corresponding detection limitation around 0.128 mg/L. As revealed in UV–vis, Raman, FT-IR and XPS spectra characterization, this conformation transition of P-Gly-NH 2 is owing to the complexing interaction between Cu 2+ and nitrogen atoms in polymer side groups, resulting in an ordered cis -cisoidal helical structures in polymer backbones. In a word, this study not only paves a new way for design and synthesis of water-soluble amino acid-based substituted polyacetylenes, but also implements the functional polymeric probes for selective and sensitive detection of heave ions through a bioinspiration strategy.
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Nanoscale
·
2017
·Vol. 9
·期 32
·11545-11552
·
IF 7.367
Wenjing Lu,Yifang Gao,Yuan Jiao,Shaomin Shuang,Chenzhong Li,Chuan Dong
A new visual fluorescent probe based on carbon nano-dots (CNDs) has been facilely synthesized via one step microwave-assisted pyrolysis and utilized for sequential detection of arginine (Arg) and Cu2+ by fluorescent and colorimetric dual-readout assay. The fluorescence of CNDs can be effectively quenched by Arg, and recovered upon addition of Cu2+ due to the competitive binding of Arg and Cu2+ that leads Arg to escape from the surface of CNDs. The probe displayed high sensitivity and selectivity toward Arg and Cu2+ over other analytes with a low detection limit of 0.26 μM and 0.17 μM, respectively. Meanwhile, the CNDs can also give dual responsive signals of a visible color change (yellow–pink–light yellow). According to this phenomenon, an “AND” logic gate based on the novel CNDs has been constructed. More importantly, the probe was also extended to cellular imaging. The proposed method was simple with ease of operation, which demonstrated great potential in bio-sensing, disease diagnosis or environmental monitoring.
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Biosensors-Basel
·
2023
·Vol. 13
·期 10
·918
·
IF 5.4
Zhen Liu,Chen Liu,Liqiong He,Jinquan Liu,Le Li,Shengyuan Yang,Yan Tan,Xing Liu,Xilin Xiao
Herein, an ultrasensitive DNAzyme-based fluorescence biosensor for detecting Cu2+was designed using the cascade signal amplification strategy, coupling λ-exonuclease-assisted target recycling and mismatched catalytic hairpin assembly (MCHA). In the designed detection system, the target, Cu2+, can activate the Cu2+-dependent DNAzyme to cause a cleavage reaction, releasing ssDNA (tDNA). Then,tDNA binds to hairpin DNA (H0) with an overhanging 5′-phosphorylated terminus to form dsDNA with a blunt 5′-phosphorylated terminus, which activates the dsDNA to be digested by λ-Exo and releasestDNA along with another ssDNA (iDNA). Subsequently, theiDNA initiates MCHA, which can restore the fluorescence of carboxyfluorescein (FAM) previously quenched by tetramethylrhodamine (TAMRA), resulting in a strong fluorescent signal. Furthermore, MCHA efficiently improves the signal-to-noise ratio of the detection system. More importantly,tDNA recycling can be achieved with the λ-Exo digestion reaction to release moreiDNA, efficiently amplifying the fluorescent signal and further improving the sensitivity to Cu2+with a detection limit of 60fM. The practical application of the developed biosensor was also demonstrated by detecting Cu2+in real samples, proving it to be an excellent analytical strategy for the ultrasensitive quantification of heavy metal ions in environmental water sources.Keywords:Cu2+detection;λ-exonuclease-assisted target recycling;mismatched catalytic hairpin assembly;cascade signal amplification;environmental pollutant
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