JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
·
IF 3.261
Pengcheng Yin,Qingfen Niu,Tao Wei,Tianduo Li,Yang Li,Qingxin Yang
A new thiophene-based colorimtric and fluorimetric dual functional sensor TSA was synthesized, which can highly sense Al 3+ and Cu 2+ ions in aqueous solution through two approaches: a significant fluorescence enhancement caused by Al 3+ and a visible color change from colorless to yellow induced by Cu 2+ . The sensor TSA showed a highly binding affinity only toward Al 3+ and Cu 2+ even in the presence of other competitive metal ions with low detection limits of 49 nM and 0.217 μM, respectively. The mechanisms of TSA for sensing Al 3+ and Cu 2+ were based on the metal ions coordination of TSA , which have been demonstrated by HR ESI-MS and 1 H NMR titration. In addition, sensor TSA was successfully applied to quantify Al 3+ and Cu 2+ in environmental water and food samples with good precision and accuracy. Moreover, the TSA -based test stips/silica can conveniently and practically detect and discriminate Al 3+ and Cu 2+ in water. Furthermore, sensor TSA has also been applied to detect Al 3+ in live HeLa cells. This work provides a new approach with easily synthetic route and economically cheap for ultrasensitive, selective, quantitative and differentiable detection of Al 3+ and Cu 2+ in environmental, food and biological systems.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 11
·112507
·
IF 4.316
Yu Lei,Xianyun Zhang,Weiye Nie,Yifan Zhang,Qingqing Gao,Fangpu Gao,Zhixiang Li,Aihua Sun,Fenghua Liu,Yuchuan Cheng,Gaojie Xu,Jianjun Guo
Meniscus-confined electrodeposition (MCED) is an effective and versatile technique for fabrication of alloy structures with precise localization and high controllability. Here, the fabrication of cobalt-copper (Co/Cu) alloy microwires using MCED techniques is reported. Co/Cu microwires with a wide range of compositions (Co9Cu91 to Co100Cu0) and controllable morphology were printed using the co-electrodeposition mode from a single electrolyte. We utilized multiphysics finite element simulation to investigate the influence of electrolyte evaporation and electric field on the concentration distribution of metal ions in the meniscus. The concentration of ions at the substrate interface increases linearly with decreasing humidity and increasing current density, which can be used to fine turn the alloy composition. By further analyzing the alloy composition, we found that the electrodeposition of Cu is diffusion controlled, while Co is mainly electrochemical reaction controlled, as a results of combined action of surface evaporation and reaction dynamics in the meniscus. The prepared alloy wires are polycrystalline, dense and uniform composition distribution. The coercivity and magnetic anisotropy are enhanced by increasing of the copper content in the alloy wires. The high tunability of composition make this alloy a promising material for magnetic micro/nano-electromechanical devices.
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Yanfang Guan,Kasolo Enock,Bei Zhou,Zhenxiang Qi,Muhammad Shahid Nadeem,Junqiang Chen,Zeng Shujie,Yixin Hu,Zihan Wu,Jingxin Wang,Jinchu Yang,Li Peng,Wei Xinxin,Longwang Yue,Song Yuchen,Limin Li,Changwei Zhu
Industrial wastewater contamination by heavy metal ions such as Cu 2+ and Zn 2+ poses severe threats to the ecosystems and human health, with traditional adsorbents limited by high costs, low adsorption capacities, poor mechanical stability, and slow kinetics. To address these problems and to improve adsorption performance, this study developed a novel hydrogel composite composed of Gellan gum, Ti 3 C 2 MXene, Poly(3,4-ethylenedioxythiophene): sulfonate (PEDOT-S:H), and aluminum oxide silicate, named GMPA. The GMPA composite, optimized at a mass ratio of 20:2.25:4:2.5, was characterized and exhibited enhanced mechanical properties, improved thermal stability, and a high density of active binding sites. Under optimal conditions (1.2 g/L adsorbent dose, pH levels of 5.9–9.5, and adsorption duration of 30–300 min), the composite removed Zn 2+ , Cu 2+ , and Mg 2+ from a 50 mg/L metal ion solution with removal efficiencies of 99%, 77.1%, and 80% respectively, with capacities of 42.81 mg/g for Zn 2+ , 26.32 mg/g for Cu 2+ , and 21.51 mg/g for Mg 2+ . Kinetics followed the pseudo-first and second order models, indicating chemisorption and physisorption-influenced mechanisms. This novel hydrogel enables applications in water purification and the removal of heavy metals from aqueous environments.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Li Kang,Hanpei Yang,Haibo Yu,Qiangshun Wu
In this work, nitrogen-doped carbon dots (NCDs) were introduced in different existent sites of titanate nanotubes (TNTs) by a facile synthesis, and their effects on surface potential, photoelectrochemical properties and simultaneous removal of coexisted Cu 2+ and norfloxacin (NOR) performance in water were systematically investigated. Constructed NCDs-TNTs composite displayed superior performance towards the adsorption (ion exchange/coordination) of Cu 2+ and adsorption-oxidization of NOR over the two individuals, mainly benefiting from the collaboration of NCDs in different existent states. The existence of Ti N H chemical linkage was identified between TNTs and NCDs-OT (NCDs on the outer surface of TNTs), which not only modulates the surface potential to favor the external diffusion of Cu 2+ or NOR + from aqueous solution to the negatively charged NCDs-TNTs, but also facilitates the intraparticle transfer of contaminants to the reactive sites. In addition, the up-conversion light property of NCDs-OT and the interstitial NCDs-IT (NCDs on the inner surface of TNTs) doping in TNTs interact together to enable NCDs-IT-TNTs to fully absorb and utilize all visible light. The photoexcited electrons were further trapped by NCDs-OT to promote the photogenerated carrier separation. Adsorbed Cu 2+ could also improve the performance of NCDs-TNTs toward NOR oxidization, mainly owing to the self-synchronous doping of adsorbed Cu 2+ broadening light absorption area and acting as mediators for delivering electrons. This work provides unique insights into the structural design of composite materials for such combined contamination remediation in water.
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高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xiangyu Ma,Kun Qian,Onome Ejeromedoghene,Martha Kandawa-Schulz,Yihong Wang
MicroRNAs (miRNAs) are becoming biomarkers for the clinical diagnosis of many diseases. However, their intrinsic properties such as low enrichment and short sequence restrict their applications. Here, we designed an ultrasensitive dual signal amplification electrochemical biosensor based on sodium alginate-polypyrrole/Au nanoparticles (SA-PPy/AuNPs) nanocomposite for the detection of miRNAs. Firstly, a planar intercalated copper(II) complex was synthesized to be the signal molecule. Then, catalytic hairpin assembly (CHA) reaction and catalytic reaction between ferric ion and copper ion were combined as a dual signal amplification to improve the sensitivity of the biosensor. In the presence of target miRNAs, multiple double helix structure formed for the CHA reaction was triggered, which immobilized more copper(II) complex on the surface of the working electrode and a strong signal was obtained in the square wave voltammetry (SWV) test. Also, the signal can be re-amplified again in the presence of ferric ion in the electrolyte. Under the optimal conditions, based on these strategies, a sensitive electrochemical biosensor was constructed for the detection of miRNAs in the range of 1 fM to 1 nM and the limit of detection was as low as 0.34 fM. Furthermore, the developed biosensor with excellent selectivity and reproducibility tested on human serum samples shows broad application prospects in the early stage of tumor diagnosis.
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Journal of Analytical Methods in Chemistry
·
2016
·
IF 1.369
Lingzhi Zhao,Liu Zhao,Yanqing Miao,Chunye Liu,Chenxiao Zhang
The detection of pyrophosphatase (PPase) activity is of great significance in diagnosing diseases and understanding the function of PPase-related biological events. This study constructed a turn off-on-off fluorescent system for PPase activity assay based on PPase-regulated competitive coordination of Cu2+ between a water-soluble fluorescent probe 6,7-dihydroxycoumarin (DHC) and pyrophosphate (PPi). The probe DHC can coordinate with Cu2+ and consequently display on-off type fluorescence response. Furthermore, the in situ formed nonfluorescent Cu2+-DHC complex can act as an effective off-on type fluorescent probe for sensing PPi due to the higher coordination reactivity between Cu2+ and PPi than that between Cu2+ and DHC. The subsequent addition of PPase to the mixture containing Cu2+, DHC, and PPi leads to the fluorescence requenching of the system again (an off state) because PPase catalyzes the hydrolysis of PPi into orthophosphate in the reaction system. Under the optimum conditions, the decrease of the fluorescence intensity of DHC-Cu2+-PPi system was linear with the increase of the PPase activity in the range from 0.1 to 0.3 U. The detection limit was down to 0.028 U PPase (). Moreover, the as-established system was also applied to evaluate PPase inhibitor. This study offers a simple yet effective method for the detection of PPase activity.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Chunlai Liu,Wei Wang,Na Wang,Zelong Liu,Peihang Shen,Jianglei Hu,Fengwei Shi
Wastewater containing heavy metal ions, such as Cu 2+ , that are released into the environment will cause irreparable damage to the nature and human health of living. It is, therefore, absolutely crucial to remove these toxic ions from water. Herein, this paper utilizes the cyano group as a functional reagent to prepare carboxyl-functionalized SBA16 for adsorbing Cu 2+ in water. In this paper, 2-cyanoethyltriethoxysilane is employed as a functionalizing reagent to prepare carboxyl-functionalized SBA16 through a one-pot method. The prepared material was characterized using various techniques, such as WXRD, TEM, FT-IR, and XPS. The results indicated that the introduction of the functionalizing reagent did not disrupt the original cage-like cubic mesoporous structure (Im3m symmetry) of SBA16. Crucial adsorption factors, namely pH, adsorbent dosage, Cu 2+ initial concentration, and contact time, affecting the removal of Cu 2+ were monitored and the optimum adsorption conditions were determined. Isotherm and kinetic investigations were conducted and a non-linear fitting method of experimental data was used to obtain isotherm and kinetic parameters. Maximum adsorption capacity reaches 181.3 mg g −1 was achieved in 60 min at pH = 3. Adsorption kinetics and adsorption isotherm followed the pseudo-second-order (R 2 = 0.999) and Langmuir (R 2 = 0.999) models, respectively. This suggests that the adsorption process primarily involves chemisorption and monolayer coverage. Thermodynamic parameters showed the spontaneous and endothermic nature of the adsorption process. After 5 cycles, the adsorbent still maintains a good adsorption capacity for Cu 2+ . This suggests promising applications for the adsorbent in treating wastewater containing Cu 2+ .
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lifen Wang,Yonggang Liu,Yinjun Lin,Xueying Zhang,Yonghao Yu,Ruiqin Zhang
Enhancing the effective contact between heterogeneous interfaces and accelerating photo-generated charge separation is the focus of current photocatalysis research. Herein, a novel Z-scheme Cu 2 (OH) 3 F/Bi 2 WO 6 (CFO/BWO) heterojunctions with intimate hetero-surface contact were successfully synthesized via electronic coupling of the surface hydrogen bonds. The optimal proportion of 25%CFO/BWO displayed outstanding photocatalytic performance among the removal of tetracycline hydrochloride (TC-HCl). The excellent catalytic effect comes from the construction of the Z-Scheme heterojunction, which accelerates the separation of photogenerated carriers, and the linking of hydrogen bonds between different planes providing more charge transfer channels. Moreover, explored the main active substances in the reaction process and tested the stability of the as-prepared samples, and the charge transfer law and degradation mechanism in the Z-scheme heterojunction are discussed in detail. This work provides a new way to construct heterojunctions with more adequate hetero-surface contact and faster charge transfer capabilities.
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Acta Crystallographica Section B-Structural Science Crystal Engineering and Materials
·
2023
·Vol. 79
·期 6
·525-536
·
IF 1.9
Jin N.,Liu Y.,Dai S.,Li Y.,Wang X.,Zhao Y.,Liu X.,Chen H.,Luo H.,Li W.
Four new coordination polymers, including 1D, 2D and 3D structures, were synthesized via a hydrothermal method using Cd2+/Zn2+/Cu2+ metal salts as nodes. These polymers were formed through self-assembly of four different dicarboxylic acid ligands, namely adamantane-1,3-dicarboxylic acid (H2adc), glutaric acid (H2glu), 5-hydroxyisophthalic acid (H2hip) and fumaric acid (H2fum), in conjunction with the auxiliary ligand [1,4-bis(pyridin-4-ylmethyl)piperazine (bpmp). The corresponding formulae are [Cd3(adc)2(bpmp)Cl2(H2O)2]n (1), {[Cd2(glu)2(bpmp)2(H2O)2]·8H2O·2CH3OH}n (2), [Zn(hip)(bpmp)(H2O)]n (3) and [Cu(fum)(bpmp)(H2O)2]n (4). Single-crystal X-ray diffraction studies revealed that the Cd2+ centers in complex 1 all adopt a six-coordinate mode but two distinct {CdO2N2Cl2} and {CuO5Cl} units. The 3D network of complex 1 can be simplified to a binodal (4.6)-connected underlying net with the point symbol (3·42·5·62)4(32·62·72·88·10). Each Cd2+ cation in complex 2 adopts a seven-coordinate {CdO5N2} center, forming an asymmetric pentagonal bipyramidal coordination. Its stacking structure is formed by the interaction of hydrogen bonds between 2D supramolecular layers, with the adjacent layers exhibiting mirror symmetry. Each Zn2+ ion in complex 3 displays a {ZnO3N} four-coordinate unit. Its stacking structure is formed by one-dimensional [Zn(hip)(bpmp)(H2O)]n chains connected through hydrogen bonds. On the other hand, complex 4 features a Jahn–Teller distorted {CuO4N2} octahedral coordination. Subsequently, the thermal stability of these complexes was investigated. The solid-state fluorescence spectroscopy was employed to analyze complexes 1, 2 and 3. Additionally, a Hirshfeld surface analysis was performed on complex 3.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Shi Zhoutong,Li Jun,Wei Gang,Cheng Biao
In organisms, the over ingesting of Cu 2+ and Zn 2+ will result in the poisoning of living cells, which severely damages the human body. Meanwhile, endogenous Histidine (His) can cause metabolic disorders like Histidinemia (His). Therefore, it is a pressing matter to design an effective method that accurately detects the amount of Cu 2+ , Zn 2+ , and His. In our study, through the nucleophilic addition and substitution reactions synthesis methods, a novel multifunctional probe, Rhodamine derivatives with vinyl functional groups at the end (RHDA) was designed and synthesized. The probe RHDA can recognize Cu 2+ and Zn 2+ separately, and the experiment further substantiates that the RHDA probe can demonstrate various turn-on colorimetric and fluorescent signals, i.e ., selectively detecting Cu 2+ in DMSO/H 2 O solution (v/v=4/6) with the “naked-eye” show evident and significant color change from colorless to pink and Zn 2+ with strong green fluorescence in DMF/H 2 O (v/v=1/1). Under optimal conditions, they could be identified under the low detection limit of 0.10 μmol·L −1 and 16.0 nmol·L −1 for Cu 2+ and Zn 2+ , respectively. Furthermore, Histidine (His) was recognized by the formed RHDA-Zn 2+ with a fluorescence “turn-off” range of 0.03–10.0 μM and a detection limit of 230.0 nmol L −1 . This article performed an extensive study of the sensing mechanisms of RHDA toward two metal ions and the ensemble RHDA-Zn 2+ toward His. The practical application experiments in DMF/H 2 O (v/v=1/1) further established that the chemosensor RHDA exhibits good cell permeability and could be employed to monitor free Zn 2+ . Finally, the complex RHDA-Zn 2+ could be applied to assay His in the living HeLa cells and zebrafishes, respectively.
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高影响因子
Food Additives and Contaminants Part A-Chemistry Analysis Control Exposure & Risk Assessment
·
2022
·
IF 3.549
Zhengxiang Li,Tong Che,Minghong Yang,Xujia Hu
A new efficient magnetic solid-phase extractant based on a surface-modified magnetic mesoporous silica microsphere referred as MMSM-PEI was synthesised and used for the enrichment and isolation of copper ions (Cu2+) in preserved eggs. The physicochemical properties and morphology of MMSM-PEI were characterized by X-ray diffraction (XRD) spectroscopy, Fourier transform infrared spectroscopy (FT-IR), vibration sample magnetometry (VSM), scanning electron microscopy (SEM) and thermos-gravimetric analyses (TGA). The concentrations of trace Cu2+ in the preserved egg were determined by flame atomic absorption spectroscopy (FAAS). The effects of important parameters were examined. The most suitable pH values and temperature for adsorbing Cu2+ were 6.5 and 25 °C, respectively. According to the determination of Cu2+ in egg white, egg yolk and the outer coating mixture (TOCM) of preserved eggs, the spiked recovery and RSD were 94.1–103.8% and 0.96–4.35%, respectively. The limit of detection (LOD) and the limit of quantitation (LOQ) were 0.14 mg/kg and 0.46 mg/kg, respectively. The developed method improved the sensitivity and accuracy of FAAS for the determination of Cu2+ and it could be applied to the determination of trace Cu2+ in real samples.
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高影响因子
NEW CARBON MATERIALS
·
2019
·
IF 1.387
Wen Liu,Rong Zhang,Yu Kang,Xiao-ying Zhang,Hao-jiang Wang,Li-hong Li,Hai-peng Diao,Wen-long Wei
Water-soluble luminescent nitrogen-doped CDs (N-CDs) having a high QY of 29.83% were prepared by a one-step microwave-assisted pyrolysis method using ammonium citrate and triethylenetetramine as the precursors. The microstructure, optical properties and biocompatibility of the N-CDs were investigated. Results indicate that they exhibit a strong fluorescence, favorable biocompatibility and excellent optical stability. Their photoluminescence is quenched by Cu 2+ ions through the formation of a complex between the N-CDs and Cu 2+ , which can be used for Cu 2+ detection. Compared with other CD-based nanomaterials, the N-CDs show outstanding optical properties, and excellent selectivity and sensitivity for Cu 2+ detection with a linear range of 0.01-11 μM and a detection limit of 4.5 nM. The selectivity for Cu 2+ detection is so good that the N-CDs have been successfully used in Cu 2+ detection for real water samples. They have also been used to draw fluorescent patterns and image living cells.
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