DALTON TRANSACTIONS
·
2026
·
IF 3.3
Xin Wang,Linlin Zhou,Xin-Mei Hou
Anthropogenic and industrial activities release toxic and non-biodegradable heavy metal ions (HMIs) into the environment, posing severe ecological risks even at trace concentrations and necessitating their critical detection. Voltammetry has been widely adopted as a mainstream analytical technique for this purpose, driving the demand for low-cost electrode materials that offer high sensitivity, low detection limits, and excellent stability. Low-dimensional silicon carbide (SiC) materials hold great promise for electrochemical applications owing to their abundant active sites, large specific surface area, facile surface functionalization, and exceptional robustness in harsh environments including extreme temperatures, strong acids, and strong alkalis. Despite these advantages, studies on the application of low-dimensional SiC materials for HMIs detection remain limited. In this work, we successfully synthesized modified SiC nanosheets and nanowires for the simultaneous electrochemical detection of Pb2+, Cd2+, Cu2+, and Hg2+. The as-prepared SiC-based electrodes exhibited lower detection limits and enhanced sensitivity compared to conventional electrodes. Moreover, they demonstrated excellent stability and reproducibility, underscoring their considerable potential for practical electrochemical sensing applications.
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DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.9
Yang Li,Wen-Bo Wang,Chen-Yu Liu,Yang Yang,Chao-Ying Gao
The alcoholysis of epoxides is the core reaction for the synthesis of key intermediates of agricultural chemicals, drugs and polymers. Traditional catalysts have problems such as harsh synthesis conditions, difficult recovery or insufficient activity. In this paper, a new heterogeneous catalyst MOF-253-Cu was prepared by anchoring Cu (II) ions to the bipyridine N, N′ chelating site of MOF-253 through post-synthesis modification strategy. Characterized by PXRD, FTIR, XPS, etc., it was confirmed that Cu (II) was stably coordinated with the MOF-253 ligand, and the catalyst retained the original framework and the element distribution was uniform. The methanolysis of styrene oxide was used as a model reaction. The conversion rate of MOF-253-Cu reached 100% and the conversion frequency (TOF) was as high as 125 h −1 at room temperature. The performance was better than that of other metal functionalized derivatives such as Co, Ag and Ni. The catalyst has good universality for alcohols with different chain lengths/structures and various epoxides, and can be recycled for 5 times without obvious activity attenuation. The mechanism study shows that the reaction follows the S N 1 mechanism, and Cu (II) acts as a Lewis acid site to activate the epoxy ring. The MOF-253-Cu catalyst developed in this study has the advantages of simple synthesis, mild reaction conditions, high activity, recyclability and strong universality.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2026
·
IF 4.6
Liu Ya-Ming,Tong Ming-De,Tang Qing-Kun,Sun Zhi-Yuan,Chen Zu-Yun,Yu Bin-Hong,Fan Cao,Yu Xiao-Yuan,Zeng Song-Shan
Aqueous zinc-ion capacitors are currently drawing attention for advanced energy storage applications, primarily because of their exceptional safety performance, environmental sustainability, and overall economic value. Hydrogel electrolytes are promising candidates for the construction of zinc-ion hybrid supercapacitors. However, most of the previously reported hydrogel electrolytes suffer from insufficient mechanical strength and limited fatigue resistance. In this study, Cu 2+ modification was introduced into a dual-physically and chemically crosslinked car-boxymethyl cellulose/chitosan (CC) gel polymer electrolyte to yield a Cu 2+ -CC gel. Coordination between Cu 2+ and functional groups (— OH, —COO − , and —NH 2 ) substantially improved the mechanical properties of the electrolyte, demonstrating a maximum tensile stress of (7.20±0.52) MPa. The resulting Cu 2+ -CC gel possesses a porous architecture, along with high ionic conductivity (31.25±0.76 mS·cm −1 at ambient temperature), a wide electrochemical stability window (2.54 V), and a high exchange current density (1.38 mA·cm −2 ). The zinc-ion hybrid supercapacitor assembled with this electrolyte retained 95.2% over 38000 charge-discharge cycles at 1 A·g −1 . Furthermore, the assembled device demonstrated remarkable operational stability even under severe mechanical deformation, including bending from 0° to 180°.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Zhenyi Zhao,Lili Yan,Guanghui Li,Pinhua Rao,Benjiao Huo,Tiantian Li,Yuliang Li,Zhaoziyue Zhang,Yiran Sun,Jiao Xue
Capacitor deionization (CDI) technology has potential applications in heavy metal removal with low operating cost, environmental friendliness, and comprehensive benefits for water remediation. In this work, using food waste biogas residue as the carbon source, food waste biogas residue composite biochar with rich pore structure was prepared by adding tobacco stalk and KOH activation as the CDI electrode material, and Cu 2+ was taken as target pollutant for heavy metal removal studies. The pore volume of food waste biogas residue composite biochar with activation temperature at 600 ℃ was 2 times larger than that of food waste biogas residue and tobacco stalk biochar. The influence of temperature on structure, composition, electrochemical performance of biochar was further systematically investigated. Food waste biogas residue composite biochar with activation temperature at 800 ℃ (ABTC800) exhibited much larger specific surface area (2044.58 m 2 /g), abundant porous structure (1.29 cm 3 /g), and higher specific capacitance. The removal capacity of ABTC800 electrode can be up to 171.26 mg/g at 3 h in 50 mg/L Cu 2+ solution at a voltage of 0.8 V. Weak acidity is more favorable for Cu 2+ adsorption. ABTC800 had an excellent adsorption capacity towards Cu 2+ . In addition, characterizations revealed that Cu 2+ removal mainly relied on electrostatic adsorption, surface complexation, precipitation, and reduction during the whole process. This study proposed a promising strategy of biogas residue reuse for heavy metal removal.
研究领域:
环境科学
·
材料科学
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Small
·
2025
·
IF 12.1
Yuehao Gan,Qiyue Wang,Hui Du,Yuqi Wang,Dao Shi,Longfei Pan,Daishun Ling,Fangyuan Li
Metal ions are essential for enzymatic regulation, redox balance, and signal transduction, with dysregulation increasingly implicated in cancer, neurodegeneration, and inflammation. Copper ions (Cu 2+ ), in particular, are closely associated with tumor progression and malignancy. However, conventional binding-based magnetic resonance imaging (MRI) probes lack the sensitivity to detect trace metal ion fluctuations in vivo. Here, a metal-ion-activity magnetic (MIAM) nanoprobe is reported that integrates activity-based chemical sensing with magnetic resonance energy transfer for signal amplification. MIAM nanoprobe consists of superparamagnetic iron oxide nanoparticles (SPIONs) linked to gadoteric acid (Gd-DOTA) via a Cu 2+ -cleavable adipic acid dihydrazide moiety. The T 1 -MRI signal is initially quenched as SPIONs suppress Gd-DOTA's relaxivity. Upon exposure to elevated Cu 2+ , Cu 2+ -catalyzed reaction breaks the covalent bond in the MIAM nanoprobe and then releases free Gd-DOTA, resulting in an activated T 1 -MRI signal. The catalytic nature of this reaction enables multiple turnover events, thereby facilitating signal amplification and enabling sensitive detection of Cu 2 ⁺ levels down to ≈10 µ m in vitro, facilitating the identification of tumor malignancy and the evaluation of therapeutic response to Cu 2+ chelators. By converting metal ion activity into quantifiable MRI contrast, the MIAM nanoprobe offers a noninvasive platform for diagnosing and tracking various metal-ion-associated diseases.
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2012
·
IF 3.898
Li-Jing Miao,Jun-Wei Xin,Zhe-Yu Shen,Yu-Jie Zhang,Hai-Yan Wang,Ai-Guo Wu
In this study, we propose a new rapid colorimetric detection method of Cu 2+ with high sensitivity and selectivity utilizing starch-stabilized silver nanoparticles (AgNPs), which are synthesized by a green chemistry way. AgNPs gradually become smaller in the presence of Cu 2+ due to redox reaction between Ag and Cu 2+ , which results in color change and UV–vis absorption decrease of the nanoparticle dispersion. Therefore, Cu 2+ could be recognized by visualizing the color change of AgNPs dispersed by naked eyes, and quantitatively measured by UV–vis spectra. There is a linear relationship between the absorbance ratio ( A 0 / A , at 400 nm) and the concentration of Cu 2+ ranging from 0.1 μM to 10 μM. The linear coefficient is 0.9968. The lowest detectable concentration is 0.5 μM by naked eyes. Furthermore, the selectivity of this detection system for Cu 2+ is excellent comparing with other metal ions , such as Hg 2+ , Co 2+ , Ba 2+ , Zn 2+ , Na + , Fe 3+ , Sr 2+ , Pb 2+ , Cd 2+ , Ni 2+ , Ca 2+ , Mg 2+ , Mn 2+ and K + . The high sensitivity and selectivity of the Cu 2+ detection system are ascribed to the unique redox reaction between Ag and Cu 2+ .
研究领域:
分析化学
·
环境科学
·
材料科学
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高影响因子
ACS Omega
·
2018
·
IF 0
Jinting Gao,Jinjin Yin,Zhanhui Tao,Yaqing Liu,Xiaodong Lin,Jiankang Deng,Shuo Wang
Whether short-term or long-term, overexposure to an abnormal amount of copper ion does significant harm to human health. Considering its nonbiodegradability, it is critical to sensitively detect copper ion. Herein, a novel fluorescent strategy with a “turn-on” signal was developed for highly sensitive and specific detection of copper ion (Cu2+). In the present investigation, we found that Cu2+ exhibits excellent peroxidase-like catalytic activity toward oxidizing the nonfluorescent substrate of Amplex Red into the product of resofurin with outstanding fluorescence emission under the aid of H2O2. Thus, an enzyme-free and label-free sensing system was constructed for copper ion detection with quite simple operation. To ensure the detection sensitivity and reproducibility, the amount of H2O2 and incubation time were optimized. The limit of detection can reach as low as 1.0 nM. In addition, the developed assay demonstrated excellent specificity and could be utilized to detect copper ion in water samples including tap water and bottled purified water without standing recovery.
研究领域:
分析化学
·
环境科学
·
生物医学
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DOI
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.454
Chuandong Zhang,Jiangquan Ma,Yun Zhao,Zhengping Li,Wenjie Liu,Chao Yao
In this article, highly efficient magnetic chitosan nanoparticles were prepared by the glutaraldehyde cross-linking method and then chemically-modified with amino groups through reaction between triethylenetramine and glycidyl methacrylate. The adsorption kinetics and isotherms of these novel adsorbents fit the pseudo-second-order model and the Langmuir model. The maximum adsorption capacities were 293 mg/g at pH = 4.3 and t = 1.4 hours. The rate-limiting step was the chemical adsorption. Further recycling experiments showed that the adsorbent provided the potential regeneration and reuse after adsorbing Cu2+. All the experimental results demonstrated that the adsorbent had a potential application in Cu2+ removal from wastewater.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2020
·
IF 0.936
Ling-Yun YU,Rui-Li LI,Hai-Lun WU,Shan-Fa ZHANG,Min-Wei CHAI,Xiao-Xue SHEN,Mei HONG,Hai LIN
Heavy metal pollutants pose a serious threat to the environment and the health of organisms. This study explored the basic characteristics of poly (acrylic acid)/acrylamide (PAAAM) hydrogel, and evaluated its application in heavy metal ions removal from simulated and real electroplating wastewater. The results showed that PAAAM displayed the highest swelling ratio and adsorption capacity of 5% AM. The swelling ratio of 5%-AM-PAAAM reached 30000% in pH 4.0–7.0. The adsorption of Cu 2+ and Ni 2+ reached equilibrium in 60 min, with the maximum adsorption capacities of 159.45 and 107.68 mg/g, respectively. The adsorption kinetics fitted the pseudo-second-order model and the adsorption isotherm followed the Langmuir model, exhibiting an exothermic adsorption process. In competitive removal process, 5%-AM-PAAAM showed selective adsorption to Cu 2+ than Ni 2+ in aquatic solution. The adsorption mechanism was related to the O-H groups in acrylic acid based on X-ray photoelectron spectroscopy (XPS) detection. In summary, 5%-AM-PAAAM was a specific adsorbent for Cu 2+ in aquatic solution with high Cu 2+ concentration.
研究领域:
环境科学
·
材料科学
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高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2021
·
IF 3.739
Lei He,Lei Wang,Haomiao Zhu,Zhe Wang,Luxia Zhang,Lutao Yang,Yong Dai,Hong Mo,Jun Zhang,Jian Shen
Oilfield wastewater contains a large number of metal ions (such as Ca 2+ and Cu 2+ ). Reinjection in oil wells without treatment would affect oil recovery. To remove Ca 2+ and Cu 2+ ions, we prepared a reusable Fe 3 O 4 /GO-COOH nanoadsorbent by the magnetization and carboxylation of graphene oxide (GO). The Ca 2+ and Cu 2+ removal percents of the nanoadsorbent reached 78.4% and 51% at 60 min, respectively. After five adsorption/desorption cycles, the nanoadsorbent retained high recovery rates (82.1% for Ca 2+ and 91.8% for Cu 2+ ) and removal percents (72.3% for Ca 2+ and 49.33% for Cu 2+ ). In the simulated indoor oil recovery test, oilfield wastewater treated with Fe 3 O 4 /GO-COOH could enhance oil recovery (EOR) by 11.0% compared with untreated oilfield wastewater. The novel magnetic nanoadsorbent could not only adsorb metal ions in oilfield wastewater effectively to enhance oil recovery (EOR) but could also be quickly recycled and reused, which shows promising application prospects in oil exploitation.
研究领域:
环境科学
·
材料科学
·
石油工程
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高影响因子
RSC Advances
·
2014
·Vol. 4
·期 35
·18222-18228
·
IF 3.708
Yun Yu,Jianrui Wang,Jiansheng Lian,Xinjian Cheng
The simultaneous detection and separation of copper ions is important. In this study, a fluorescent chemosensor (a copper sensitive molecule), was prepared using 6-bromo-benzo[de]isochromene-1,3-dione as a precursor. The as-prepared fluorescent molecule contains a hydroxyl group and an aminoquinoline moiety. The hydroxyl group enables the fluorescent molecule to anchor to a porous polyurethane (PU) sponge. The chemosensors still retained their recognition ability after they were introduced to PU. Upon the addition of Cu2+ ions to the PU sponge, both the color and the fluorescence intensity changed, suggesting that the chemosensor-functionalized PU sponges could be used as a Cu2+ ion sensor. The copper ions could also accumulate and be enriched on the sponges. The adsorption capacity of the PU sponge (containing 2 wt% of the chemosensor) reached 97.26 mg g−1, which was higher than that of the solid PU membranes (52.62 mg g−1). These polymeric, highly sensitive chemosensors may potentially be applied in the detection of water pollution generated by sources such as electroplating and drain outflow.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
Congming Ding,Meini Yuan,Xiaochen Cao,Xuebin Tang,Yufeng Zhao,Wenqian Hao,Jiamiao Xie
Copper salt metal compounds are widely used in the field of supercapacitor electrode material due to their rich ionic groups. In this paper, NiCo(OH) 4 /Cu 2 (OH) 3 NO 3 electrode material is prepared by the solvothermal method by doping NiCo-based hydroxide with copper salt metal compounds (Cu 2 (OH) 3 NO 3 ). NiCo(OH) 4 /Cu 2 (OH) 3 NO 3 electrode material with different morphologies and sizes is prepared by adjusting the concentration of metal salts. When the metal salt concentration is 2 M, the prepared circular sheet NiCo(OH) 4 /Cu 2 (OH) 3 NO 3 electrode material with a diameter of 3 μm and a thickness of 150 nm exhibits excellent specific capacitance (1335 C g −1 at 1 A g −1 ) and capacitance retention (after 5000 cycles, the capacitance retention rate is 71.7 %). Furthermore, the NiCo(OH) 4 /Cu 2 (OH) 3 NO 3 //AC asymmetric supercapacitor is prepared, which exhibited an energy density is 83.78 Wh kg −1 at a power density of 800 W kg −1 . The capacitance retention rate of the asymmetric supercapacitor is 65.2 % (after 5000 cycles at 10 A g −1 ). We used copper salt metal compounds (Cu 2 (OH) 3 NO 3 ) to improve the electrochemical performance of NiCo-based hydroxide electrode material. This idea has certain reference significance for improving the performance of NiCo-based hydroxide electrode material.
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