Minerals
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2020
·Vol. 10
·期 2
·157
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IF 2.38
Chonghui Zhang,Tingshu He,Wei Chen,Xianzhong Bu,Sen Wang,Xiaozhen Tian
Sodium thioglycolate is a chalcopyrite depressant, but its depressant effect is weak. The paper investigated the effect of CuSO4on the depressant performance of sodium thioglycolate towards chalcopyrite through flotation tests, Zeta potential measurements, X-ray photoelectron spectroscopy (XPS) analyses and Fourier-transform infrared (FTIR) spectra measurements. It was found that copper ions could improve the depressant effect of sodium thioglycolate on chalcopyrite. The results showed that copper ions could adsorb on the surface of chalcopyrite and form mixed copper sulfide and cupric oxides/hydroxides adsorption layers. As a result, the mineral composition on the chalcopyrite surface was changed. With sodium thioglycolate treatment, the Zeta potential and the adsorption sites of chalcopyrite surface were both increased, and the hydrophobic substance Sn2−/S0concentration was decreased. The electrostatic repulsion of chalcopyrite surface with sodium thioglycolate was also decreased, which made the sodium thioglycolate interact with chalcopyrite more easily. The more active sites could adsorb more sodium thioglycolate, which improved the hydrophilia of chalcopyrite. At the same time, the decrease of Sn2−/S0concentration could further improve the hydrophilia of chalcopyrite. The results show that the copper ions could exhibit auxiliary effect with sodium thioglycolate and could further enhance the depressant effect of sodium thioglycolate on the chalcopyrite flotation. This paper provides new insights into the depression of chalcopyrite flotation by sodium thioglycolate.Keywords:flotation;chalcopyrite;sodium thioglycolate;copper ions;depressant
研究领域:
矿物加工工程
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表面化学
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DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 3
·1459
·
IF 4.6
Xinying Zhang,Xialing Hou,Decheng Lu,Yingying Chen,Lingyan Feng
Porphyrin (TMPyP) functionalized carbon quantum dots (CQDs-TMPyP), a novel and efficient carbon nanocomposite material, were developed as a novel luminescent material, which could be very useful for the sensitive detection of copper ions in the Cu2+quenching luminescence of functionalized carbon quantum dots. Therefore, we constructed a sensitive “signal off” ECL biosensor for the detection of Cu2+. This sensor can sensitively respond to copper ions in the range of 10 nM to 10 μM, and the detection limit is 2.78 nM. At the same time, it has good selectivity and stability and a benign response in complex systems. With excellent properties, this proposed ECL biosensor provides an efficient and ultrasensitive method for Cu2+detection.Keywords:carbon quantum dots;porphyrin;electrochemiluminescence;Cu2+detection
研究领域:
分析化学
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纳米材料
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环境科学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Na Wang,Ying Liu,Yuhang Li,Qin Liu,Minqian Xie
In this paper, we propose a fluorescent and colorimetric sensor for Cu 2+ ion based on formaldehyde modified hyperbranched polyethylenimine capped gold nanoparticles (F-hPEI Au NPs). The fluorescent sensor is prepared by one-pot synthesis, of which the fluorescence intensity could be quenched by Cu 2+ ion. The response behavior of the sensor is dependent on the pH value of the solution. At pH 4.0, the sensor exhibits a linear response for Cu 2+ ion over a wide concentration range of 0.15 μM–23 μM. The detection limit for the sensor is estimated to be 77 nM (S/N = 3), and the precision for five replication detections of 2.0 μM Cu 2+ ion is 4.7% (relative standard deviation). Both the color and fluorescence intensity of the sensor change obviously and could be observed with the naked eyes when there is continuous addition of Cu 2+ ion. The fluorescence intensity of quenched sensor could be recovered by EDTA, which provides a potential method to regenerate the sensor. Furthermore, the sensor shows satisfying reliability and accuracy in practical Cu 2+ ion detection applications.
研究领域:
分析化学
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材料科学
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DOI
高影响因子
CHEMOSPHERE
·
2016
·
IF 3.698
Yaolan Niu,Diwen Ying,Kan Li,Yalin Wang,Jinping Jia
Functional PET fiber (PET–AA–CS) was prepared by oxygen–plasma pretreatment and grafting of acrylic acid (AA) and low–molecular–weight chitosan (LMCS) on the polyethylene glycol terephthalate (PET) substrate. This adsorbent was targeted for quick removal of metal ion in river pollutions with an easy recycling of the fiber after emergency processing. The fabricated PET–AA–CS was characterized by the scanning electron microscope (SEM), contact angle, fourier transform infrared (FTIR) spectra and X–ray photoelectron spectroscopy (XPS) to look into its morphology, surface functional groups, and adsorption mechanism of copper ions from the aqueous solution. The overall adsorption process of copper ions on the PET–AA–CS was pH–dependent with an optimal pH value of 5.0, at which a maximum capacity of 68.97 mg g −1 was obtained. The result of fitting also shows that adsorption process follows the Langmuir isotherm and pseudo–second–order model. Moreover, the material shows good stability during 5 cycles of adsorption and desorption, and also shows no significant effect of co–existing ions including Ca 2+ , Mg 2+ , K + , Cl − , and et al. In general, PET–AA–CS developed in this study shows significant benefit of eco–friend and cost-efficiency for fast removal of copper ions in potential river metal pollutions comparing with traditional adsorbents.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
·
IF 2.567
Xingwen Lu,Fei Wang,Xiao-yan Li,Kaimin Shih,Eddy Y. Zeng
In recent years, zeolite has been proven to be a cost-effective adsorbent for treating wastewater containing heavy metal ions. However, few studies have investigated the subsequent treatment of metal-laden zeolites after adsorption, which may become a source of secondary pollution if not properly dealt with. To fill the knowledge gap, the adsorption behavior of Pb2+ and Cu2+ on zeolite was examined in the present study. The adsorption process was fast and reached equilibrium within 60 min, with adsorption data fitted better with the Langmuir equation than the Freundlich equation. After thermal treatment for metal-adsorbed zeolites, X-ray diffraction results showed that Pb2+ and Cu2+ adsorbed on zeolites can be readily stabilized into PbAl2Si2O8 and CuAl2O4, and the best temperatures for formation of PbAl2Si2O8 and CuAl2O4 were 950 and 1000 °C, respectively. Finally, a prolonged leaching test (at pH 2.9 for 22 d) demonstrated that the Pb2+ and Cu2+ concentrations in the leachate of calcined samples were approximately 2 orders of magnitude lower than those of untreated samples, validating the high stability of treated zeolites. All these findings pointed to the potential for use of zeolites as a promising and sustainable strategy to treat and stabilize Pb2+ and Cu2+ in wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2013
·Vol. 29
·期 3
·419-423
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IF 0.735
Cao Ben-nan,Hu Qin,Huang Yan,Jia Chun-man,Zhang Qi
A new chemosensor based on a Schiff base has been designed and synthesized. Its sensing behavior toward various metal ions was investigated by fluorescence and UV-Vis spectroscopic methods. The fluorescence of the sensor was quenched and the color rapidly changed from canary yellow to brown after the addition of Cu 2+ , while no changes occurred after the addition of other metal ions, which contributes to the detection of Cu 2+ with naked eyes. The fluorescence quantum yield of the ligand was calculated to be 0.52. The corresponding detection limit of Cu 2+ was 5.721×10 −7 mol/L, and the 1:1 binding mode of the sensor with Cu 2+ was revealed by Job’s plot.
研究领域:
分析化学
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材料科学
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DOI
高影响因子
Arabian Journal of Chemistry
·
2013
·
IF 2.266
Ting Wen,Fei Qu,Nian Bing Li,Hong Qun Luo
In this work, we developed a facile, sensitive, and rapid spectrophotometric method for copper(II) ion detection in aqueous media using polyethyleneimine. Polyethyleneimine is a cationic polymer that has no absorption in the wavelength range of 250–800 nm. When trace amounts of copper(II) ion was added to the colorless polyethyleneimine solution, copper(II) ion could react with the amino groups of the polyethyleneimine to form a dark blue cuprammonium complex whose absorption spectrum exhibited two absorption peaks at 275 and 630 nm, respectively. The effects of parameters such as polyethyleneimine concentration, pH, temperature, reaction time, and the most suitable medium for the reaction were investigated. A linear relationship ( R 2 = 0.9997) between absorbance and the concentration of copper(II) ion was found at the maximum absorption peak of 275 nm in the concentration range of 2–400 μM. The detection limit for copper(II) ion was 566 nM. The response of polyethyleneimine toward different metal ions was investigated, and polyethyleneimine displayed a high selectivity for the copper(II) ion among the metal ions examined. This biocompatible and sensitive sensor may find applications in copper(II) ion detection in environmental and biological processes.
研究领域:
分析化学
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环境科学
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生物化学
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2021
·
IF 6.558
Wendi Han,Chenfang Miao,Xintian Zhang,Yinning Lin,Xiaoli Hao,Zhengjun Huang,Shaohuang Weng,Xinhua Lin,Xianzhong Guo,Jianyong Huang
The content of deferasirox (DEF) in plasma is significant in β-thalassemia patient that needs long-term transfusion therapy, while the effective and simple strategy for DEF monitoring is still limited. The carbon dots (CDs) prepared from citric acid monohydrate and glutathione exhibit weakly modulated fluorescence intensity to several common metal ions containing Cu 2+ . Interestingly, the process of interaction of Cu 2+ and DEF forms the chelation of Cu 2+ and DEF (Cu-DEF) with the absorbance wavelength of DEF at 320 nm shifting to 332 nm for Cu-DEF. And the obtained Cu-DEF will effectively quench CDs through inner filter effect (IFE). Accordingly, a facile signal-off fluorescent method based on CDs as probe is developed for DEF detection using Cu 2+ as medium. And the proposed method exhibits linear range of 0.5–20 μg/mL with the detection limit of 0.33 μg/mL for DEF under the optimized conditions. Moreover, the developed assay is further expanded to test the content of DEF in dispersible tablet and plasma with accuracy and reproducibility. Such cost-effective and sensitive fluorescent assay just through simple mixing operation present a valuable strategy for drug monitoring.
研究领域:
医学
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分析化学
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DOI
PubMed
高影响因子
Frontiers in Chemistry
·
2021
·
IF 5.221
Tang Shurong,Liu Qiao,Hu Jie,Chen Wei,An Fengping,Xu Hui,Song Hongbo,Wang Yi-Wei
In this paper, we developed a quick, economical and sensitive colorimetric strategy for copper ions (Cu2+) quantification via the redox response of MnO2 nanosheets with glutathione (GSH). This reaction consumed MnO2 nanosheets, which acted as a catalyst for the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to a blue product (oxTMB). In the presence of Cu2+, the GSH was catalyzed to GSSG (oxidized glutathione), and the solution changed from colorless to deep blue. Under the optimum conditions, the absorption signal of the oxidized product (oxTMB) became proportional to Cu2+ concentration in the range from 10 to 300 nM with a detection limit of 6.9 nM. This detection system showed high specificity for Cu2+. Moreover, the system has been efficaciously implemented for Cu2+ detection in actual tap water samples. The layered-nanostructures of MnO2 nanosheets make it possess high chemical and thermal stability. TMB can be quickly oxidized within 10 min by the catalyzing of MnO2 nanosheets with high oxidase-like activity. There is no need of expensive reagents, additional H2O2 and complicated modification processes during the colorimetric assay. Therefore, the strategy primarily based on MnO2 nanosheets is promising for real-time, rapid and highly sensitive detection of Cu2+ under practical conditions.
研究领域:
分析化学
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环境科学
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DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 15
·4954
·
IF 4.927
Chengqi Bao,Yan Lu,Jiawei Liu,Yansha Gao,Limin Lu,Shuwu Liu
In this work, β-cyclodextrin (β-CD)/mesoporous carbon (CMK-8) nanocomposite was synthesized and used as an electrochemical sensing platform for highly sensitive and selective detection of Cu2+. The morphology and structure of β-CD/CMK-8 were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). In addition, the dates from electrochemical impedance spectroscopy (EIS) and Cyclic voltammetry (CV) demonstrated that the β-CD/CMK-8 possessed a fast electronic transfer rate and large effective surface area. Besides this, the β-CD/CMK-8 composite displayed high enrichment ability toward Cu2+. As a result of these impressive features, the β-CD/CMK-8 modified electrode provided a wide linear response ranging from 0.1 ng·L−1to 1.0 mg·L−1with a low detection limit of 0.3 ng·L−1. Furthermore, the repeatability, reproducibility and selectivity of β-CD/CMK-8 towards Cu2+were commendable. The sensor could be used to detect Cu2+in real samples. All in all, this work proposes a simple and sensitive method for Cu2+detection, which provides a reference for the subsequent detection of HMIs.Keywords:copper ion;β-cyclodextrin;mesoporous carbon;electrochemical sensor
研究领域:
分析化学
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材料科学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2023
·
IF 1.2
Quan-Xing MAO,Jun-Na YANG,Xi WU,Yang FU,Xi-Ming SONG,Tian-Yi MA
There are various kinds of pollutants in our environment from the discharged sewage that damage human’s health. Determination of multiple pollutants is important for safety and the detection methods are always needed. This study reports a determination method for p -nitrophenol ( p -np) and copper ions by using the dual fluorescence centers of N,S co-doped CDs (N,S-CDs). N,S-CDs was prepared by hydrothermal treatment of thiourea and citric acid in N N dimethylformamide. The as-prepared N,S-CDs are spherical particles with size distribution of 1.20±0.42 nm, as well as functional groups such as thiol and carboxyl. The rich surface species endow the CDs dual fluorescence centers at 380 nm/460 nm and 550 nm/625 nm. Interestingly, the fluorescence at 380 nm/460 nm can be quenched by p -np, while the fluorescence at 550/625 nm can be quenched by copper ions. Mechanism investigations revealed that inner filter effect of p -np and combination with copper ions are responsible for the fluorescence quenching. Determination methods are thus found with detection limits of 6.47×10 −6 mol L − 1 for p -np and 6.0×10 −7 mol L − 1 for Cu 2+ . Piped water are tested and the results are satisfactory with recoveries in the range of 94.33%—100.67% for p -np and 98.67%—106.33% for Cu 2+ . In conclusion, this work provides a new approach for determination of multiple targets by using the dual fluorescence of N,S-CDs.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jue Wang,Xi Yang,Dongdong Yan,Junyan Wu,Yiguo He,Yadong Zhang
Imprinted resins have attracted much attention for their high contaminant removal and reuse performance. Chloroacetylated polystyrene resins, polyethyleneimine, epichlorohydrin, and Cu(II) were used as support, functional monomer , cross-linker and template, respectively. The ion-imprinted resins (PS-PEI@SIP) and non-imprinted resins (PS-PEI@NIP) were prepared by the combination of amination reactions and surface ion-imprinting technique. The adsorption processes of Cu(II) with PS-PEI@SIP and PS-PEI@NIP followed pseudo-second-order kinetics. The langmuir isothermal adsorption model was consistent with the adsorption curve, indicating that Cu(II) were uniformly adsorbed on the PS-PEI@SIP surface. Thermodynamic experiments showed that the adsorption of Cu(II) by PS-PEI@SIP was a spontaneous process, and high temperature was favorable for adsorption. In addition, the selectivity of PS-PEI@SIP to Cu(II) was confirmed by multi-component competitive adsorption experiments. When Cu(II) mixed with Ni(II), Zn(II) and Cd(II), the selection coefficients of PS-PEI@SIP for Cu(II) were 31.98, 37.19 and 64.27. The results showed that PS-PEI@SIP had high adsorption capacity and good selectivity for Cu(II) ions in mixed ionic solution, and the adsorption capacity was 89.4 mg·g –1 . The simulation wastewater dynamic adsorption experiment showed that the PS-PEI@SIP adsorption column could treat 52.8 BV Cu(II) concentration ( C ＜7.5 mg·g –1 ), when the influent Cu(II) concentration was 150 mg∙L −1 . When 1 mol∙L −1 HCl solution was used for dynamic desorption of PS-PEI@SIP, the desorption rate was more than 92%, indicated that PS-PEI@SIP had good regeneration performance. These results provided basic information for the production of imprinted adsorbent resins.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）