Analytical Methods
·
2021
·Vol. 13
·期 20
·2305-2312
·
IF 2.896
Quanxiu Zhou,Zhaofa Li,Qunfang Wang,Liang Peng,Shihe Luo,Feng Long Gu
In this work, poly(styrene-co-maleic anhydride)-capped CdSe/ZnS quantum dots (QDs) aminolyzed with ethanolamine are proposed as fluorescent probes for the detection of Cu2+ and Hg2+, and two different quenching mechanisms are discussed in detail. The coordination abilities of the surface polymer of CdSe/ZnS QDs and two metal ions are calculated by density functional theory (DFT). The photoinduced electron transfer from excited QDs to Cu2+ unoccupied orbitals is enhanced due to the coordination between Cu2+ and the surface polymer of QDs. The electron transfer consumes non-radiative energy and performs fluorescence quenching. For Hg2+, the formation of HgS and the slight aggregation of polymer-coated CdSe/ZnS QDs lead to fluorescence quenching. The probe is sensitive to both Cu2+ and Hg2+, and the response can be detected within 1 min without adjusting the pH. With the addition of a masking agent, Cu2+ and Hg2+ can be exclusively detected in coexistence with another ion. For Cu2+, a linear relation in the concentration ranging from 0.02 to 0.7 μM was found between the relative fluorescence intensity (F0/F) and the concentration of Cu2+; the limit of detection (S/N = 3) is 6.94 nM. For Hg2+, a linear relation ranging from 0.1 to 1.4 μM was found between ln(F0/F) and the concentration of Hg2+; the limit of detection is 20.58 nM.
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RSC Advances
·
2021
·Vol. 11
·期 34
·20720-20724
·
IF 3.361
Guangyu Zhu,Hanjia Hu,Tao Yang,Junjun Ma,Sanjun Zhang,Xiaohua He
Stable fluorescent silver nanoclusters (AgNCs) were synthesized through one-step UV photoreduction using the multiple carboxyl copolymer poly(methacrylic acid-co-itaconic acid) P(MAA-co-IA) as a novel template. The fluorescence lifetime and the quantum yield of the obtained AgNCs were 1.84 ns and 8.9% in an aqueous solution, respectively. Owing to the multiple carboxyls of the protective P(MAA-co-IA) template, the obtained AgNCs have excellent advantages such as good dispersity, and high stability, which make them suitable for highly sensitive and selective detection of Cu2+ by fluorescence quenching. A good linear relationship exists between the degree of fluorescence quenching for silver nanoclusters and Cu2+ concentration ranging from 0 to 10 μM. The limit of detection (LOD) is 6.36 nM. The result implies that the as-synthesized AgNCs show great potential in the analysis field.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 30
·期 11
·4863-4876
·
IF 4.705
Fan Yajun,Shen Dianling,Yan Yu,Hu Xiaopeng,Guo Yaping,Zhong Yujun,Li Zhiyang,Xie Lianwu
To achieve efficient adsorption and recycling of Cu 2+ in wastewater, using Cu 2+ as template ion, glutaraldehyde as crosslinker, three sodium alginate hydrogel beads including SA, SAC, and SAB beads were prepared by imprinting sol–gel method using sodium alginate (SA) with carboxymethyl cellulose (CMC) and β -cyclodextrin ( β -CD) as different precursors, respectively. Scanning electron microscopy and Fourier transform infrared spectroscopy were used to characterize and analyze morphology and composition change of the hydrogel beads, respectively. When the mass ratio of SA to CMC or SA to β -CD reach 1:1, the SAC beads or SAB beads are nearly homogeneous sphere. Then the effects of pH, adsorption time, initial concentration of Cu 2+ , adsorbent dosage, and coexisting ions on the adsorption efficiency of three hydrogel beads were investigated. The results indicated that adding carboxymethyl cellulose and β -cyclodextrin into skeleton of beads increased the toughness of the beads and improved the adsorption capacity of Cu 2+ . Compared to the saturated adsorption capacity 510 mg/g of Cu 2+ on SA, the saturated adsorption capacity of Cu 2+ on SAB and SAC reached 817 mg/g and 822 mg/g, respectively. And their adsorption efficiency for Cu 2+ are over 95% at 25 °C with pH of 7, contact time within 350 min, adsorbent dosage of 4 mg/50 mL, and initial concentration of 5 mg/L. Thus, SAC and SAB beads could be used as adsorption material for detecting and removing Cu 2+ from wastewater.
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JOURNAL OF FLUORESCENCE
·
2019
·Vol. 29
·期 3
·727-735
·
IF 1.913
Huang Kun,Han Defang,Li Xianglin,Peng Mengni,Qiu Qi,Qin Dabin
A new biscarbazole-fused xanthene hybrid dye MeBCX has been prepared by CH 3 SO 3 H-promoted condensation of 4-hydroxycarbazole and o -phthalic anhydride, followed by esterification with methanol, which exhibits good cell membrane permeability. Taking advantage of the spiro-controlled xanthene platform of the dye, a Cu 2+ -selective fluorescence “off-on” probe BCX-Cu has been successfully prepared with excellent performances in selectivity and sensitivity, and the detection limit is calculated to be 88.7 nM. The sensing mechanism is confirmed to involve a specific cascade reactions of Cu 2+ -induced spirolactam ring-opening and hydrolysis. In addition, living L929 cell imaging demonstrates the probe has living cell membrane permeability and shows great potential for tracing intracellular Cu 2+ through fluorescence imaging technology.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Zhengguo Wu,Weijie Deng,Wei Zhou,Jiwen Luo
As a kind of potential absorbent, polysaccharide materials are limited due to weak stability, low absorption and recovery rate. Herein, a novel composite adsorbent – the magnetic composite gel beads (CMC/SA/graphene oxide@Fe 3 O 4 ) were prepared by combining carboxymethyl chitosan (CMC), sodium alginate (SA) with graphene oxide@Fe 3 O 4 , and then utilized for the adsorption of Cu 2+ , Cd 2+ and Pb 2+ from the wastewater. The physicochemical property of CMC/SA/graphene oxide@Fe 3 O 4 beads were characterized in detail. The CMC/SA/graphene oxide@Fe 3 O 4 magnetic gel beads could separate easily from the wastewater and showed a higher stability due to the addition of graphene oxide@Fe 3 O 4 . The adsorption experiments show that the adsorption of Cu 2+ , Cd 2+ and Pb 2+ on the magnetic gel bead was well fitted with pseudo-second-order model and Langmuir isotherm model, and the maximum adsorption capacity of Cu 2+ , Cd 2+ and Pb 2+ reached 55.96, 86.28 and 189.04 mg/g, respectively. Moreover, the magnetic gel beads had selective adsorption toward Pb 2+ . In addition, the magnetic gel beads still obtained 90% of the adsorption rates after five cycles, and showed good adsorption efficiency in the simulated real environment. This work proves that the CMC/SA/graphene oxide@Fe 3 O 4 magnetic gel beads as the adsorbents have promising potential in wastewater treatment.
研究领域:
环境科学
·
材料科学
·
化学工程
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INORGANICA CHIMICA ACTA
·
2025
·
IF 3.2
Qian Sun,Lu Ren,Jing Wang,Kun Bai,Chang Liu,Yanqi Liu,Dawei Zhang
Coumarin-structured ( E )-7-(diethylamino)-3-(1-(2-(4-methylbenzo[ d ]thiazol-2- yl)hydrazono)ethyl)-2 H -chromen-2-one (HTM) was synthesized in two steps using N , N -diethylsalicylaldehyde, ethyl acetoacetate and 4-methyl-2-hydrazine-benzothiazole as raw materials. The HTM was characterized by FT-IR, 1 H NMR, 13 C NMR and HR-MS. It was found that the probe HTM has rapid and highly selective recognition ability for Cu 2+ in EtOH/H 2 O (1:1, v /v). The spectral characteristics of the probe HTM were investigated using fluorescence spectroscopy and ultraviolet-visible spectroscopy. The results showed that the binding of probe HTM to Cu 2+ produced a significant fluorescence quenching effect, and the influence of other metal ions was negligible. In visible light, when HTM interacts with Cu 2+ , the solution changes from yellow to orange as observed by the naked eye. Subsequently, the binding mechanism of the probe HTM to Cu 2+ was explored by Job's plot, 1 H NMR titration and DFT calculations, and it was found that they cooperated in a 1:1 manner. Linear equations for ultraviolet-visible and fluorescence intensities at different Cu concentrations were fitted, and the detection limits (LOD) were calculated to be 5.22 nM and 3.70 nM, respectively. Experimental studies on the recovery rates of standard additions indicated that the probe HTM could be used for the quantitative detection of Cu 2+ in actual water samples. The potential application of this probe in fingerprint detection was also investigated. In addition, the probe has been successfully applied to Cu 2+ monitoring in living cells.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.5
Amatjan Sawut,Yurou Feng,Rena Simayi,Manfang Pan
Heavy metal ion pollution in wastewater, particularly Cu 2+ contamination, threatens ecology and human health, demanding efficient adsorption materials in environmental remediation. However, conventional adsorbents suffer from insufficient capacity, poor mechanical stability, weak selectivity, and low reusability, restricting their practical application. Herein, a semi-interpenetrating network composite hydrogel (ZIF-8-AVA) was fabricated via in situ self-assembly, integrating ZIF-8 nanocrystals into a poly(acrylamide- co -vinylimidazole)/sodium alginate (AVA) matrix. Vinylimidazole units served as nucleation anchors, firmly immobilizing ZIF-8 on the polymer backbone via metal-ligand coordination to form a stable system. ZIF-8 significantly enhanced AVA's mechanical properties and Cu 2+ adsorption performance: the composite followed the Langmuir monolayer adsorption model with a maximum adsorption capacity of 355.9 mg/g, achieving 93.81% Cu 2+ removal efficiency at an initial concentration of 50 mg/L. Furthermore, the ZIF-8-AVA hydrogel exhibited excellent selectivity for Cu 2+ in multi-competing-ion systems and maintained high adsorption efficiency after 5 consecutive adsorption-desorption cycles. The key innovation lies in the in situ self-assembly strategy that realizes the intimate integration of ZIF-8 with the hydrogel matrix via coordination-driven anchoring, overcoming the common issue of MOF particle leaching and synergistically enhancing adsorption capacity, selectivity, and mechanical stability. This work offers a novel approach for tunable MOF hydrogels, with great potential in heavy metal wastewater treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9
Yan Zhao,Jun Yao,Ning Min,Bo Ma,Wenping Chai,Yvqing Ma
Acid mine drainage (AMD) originates from mineral extraction and processing operations, exhibiting high acidity and containing elevated concentrations of metals and sulphates, which frequently pose significant environmental challenges. This study combined biochar with clay minerals to prepare two magnetic biochar-montmorillonite composites (FMBC1 and FMBC2) via coprecipitation-pyrolysis and impregnation-pyrolysis methods for investigating their removal efficiency and mechanisms for Cu, Pb, and Cd from metal solutions. Adsorption results indicate that at a dosage of 1.5 g/L, both FMBC1 and FMBC2 achieve removal efficiencies exceeding 99% for Cu (100 ppm), Pb, and Cd (50 ppm). Material characterization revealed that functional group complexation, crystallization-precipitation, possible ion exchange and reduction precipitation were the mechanisms by which FMBC1 and FMBC2 interact with Cu, Pb, and Cd in solution. Furthermore, FMBC1 and FMBC2 effectively removed Cu, Pb, and Cd from synthetic wastewater and could be recovered rapidly via magnetic attraction. Following desorption with EDTA-HCl, adsorbed FMBC1 and FMBC2 can be reused. The findings of this study provide potential theoretical foundation for treating heavy metals in AMD.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Xiaojie Fang,Sidi Zhu,Jianzhe Ma,Fengyun Wang,Haihua Xu,Mingzhu Xia
In this paper, a simple chemical precipitation method was proposed to obtain zoledronate functionalized hydroxyapatite (zole-HAP) hybrid nano- biomaterials (zole-HAP-HNBM) which were firstly applied to adsorption. The characterizations of materials verified that the addition of zoledronate declined the crystallinity and transformed the morphology of HAP from short rod shape to microsphere, changed micro structure of the hybrid nanobiomaterial. Adsorption experiments carried out under different conditions showed that adsorption capacity of the nanobiomaterial, enhanced by the addition of zoledronate in preparation, which is equal to 1460.14 mg/g on Pb 2+ and 226.33 mg/g on Cu 2+ in optimum qualifications, was elevated more than the reported values in many literatures. At last, the sorption mechanisms of HAP and zole-HAP for Pb 2+ and Cu 2+ were probed by experiments and Multifwn program calculation in details. It suggested that the dominant sorption mechanisms of HAP for Pb 2+ were ion exchange and dissolution-precipitation rather than surface complexation, while besides the dissolution-precipitation mechanism, surface complexation may contribute more in the adsorption process of 10zole-HAP for Pb 2+ . Once considering HAP and 10zole-HAP, removal mechanisms of Cu 2+ could involve surface complexation and ion exchange.
研究领域:
材料科学
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环境科学
·
生物学
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LUMINESCENCE
·
2026
·Vol. 41
·期 8
·e70602
·
IF 2.8
Long Liu,Shaoyun She,Qihuan Chen,Yichen Li,Xiaotong Deng,Meijun Ye,Jiamin Liu,Hanqing Wu,Jingshui Xu
As a common heavy metal pollutant, Cu 2+ seriously endangers environmental safety and human health. A novel triphenylamine-based Schiff base fluorescent probe (triphenylamine-diaminopyridine, TPA-DAP) was synthesized with diaminopyridine as the recognition unit. It exhibits high selectivity, rapid response, large stokes shift, low detection limit of 1.04 μM, obvious fluorescence quenching, and visible color changes toward Cu 2+ . Cu 2+ binds with TPA-DAP to form a stable 2:1 complex and quenches fluorescence through electronic and paramagnetic effects, which can be reversed by vitamin C. The sensing mechanism was verified by HRMS, NMR, and DFT calculations. TPA-DAP achieves effective Cu 2+ detection in actual water samples. The prepared TPA-DAP@PVA/SA composite membrane establishes a fluorescence-afterglow dual-mode platform for portable visual on-site Cu 2+ detection.
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JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
You Mei,Zhou Zixuan,Yan Xinying,Xie Haotian,Chen Xueke,Zhang Jing,Liao Fusheng,Wei Guobing,Fan Hao,Yin Zhaojiang
In this study, we developed a fluorescent sensor based on a pyrene-derived covalent organic framework (PT 2 D-COFs) for the efficient and sensitive detection of copper ions (Cu 2+ ) and iron ions (Fe 3+ ). The PT 2 D-COFs are synthesized via a Schiff base reaction, exhibiting high crystallinity, excellent porosity, and remarkable chemical stability, which provide ideal coordination sites for the effective recognition of metal ions. The results demonstrate that the PT 2 D-COFs exhibit significant fluorescence quenching upon interaction with Cu 2 ⁺, with a detection limit (LOD) of 0.79 nM, while fluorescence enhancement is observed in the presence of Fe 3+ , with an LOD of 0.47 nM. and reproducibility in complex sample matrices. It was effectively utilized to quantify Cu 2+ and Fe 3+ in environmental water samples and traditional Chinese herbal medicines, achieving satisfactory recovery rates. This sensor demonstrates characterized by its low detection limits, strong anti-interference capability, and broad application potential, holds significant promise for applications in environmental monitoring and bioanalysis. Graphical abstract
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2026
·
IF 4.8
Zijia Jin,Yao Li,Zhenhui Yue,Feng Zhao,Zhen Lei
Thiram (Thr) residues pose potential risks to ecological environment and human health. Herein, a simple multi-channel colorimetric assay for Thr detection was proposed. Cu 2+ served as the colorimetric probe, and coordinated with Thr, forming Cu 2+ -Thr complex with satisfactory oxidase (OXD)-like and laccase (LAC)-like activity. The catalytic kinetics of Cu 2+ -Thr complex well fitted Michaelis-Menten model. Leveraging Thr activated OXD and LAC-like activities of Cu 2+ , colorimetric assays for Thr detection were developed. The detection range and limit of detection of this method were comparable to those methods involving nanomaterials. By integrating smartphone with test papers and test swabs, two portable sensing platforms were developed to achieve on-site detection of Thr. The concentrations of Thr in food and water samples were successfully determined via multiple channels with satisfactory recoveries and relative standard deviation. The simple and low-cost multi-channel colorimetric sensing platforms showed potential for food safety analysis and environmental monitoring.
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