JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Xiaoyong Qiu,Jun Huang,Hui Wang,Yulu Qi,Jiwei Cui,Jingcheng Hao
Hypothesis Water contamination from heavy metal ions is a major global environmental concern. Adsorbents based on biomaterials have been demonstrated to possess remarkable removal efficiency for metal ions, but the adsorption model of biosorbents is not clear and much efforts should be devoted to study the adsorption behaviors and understand the adsorption mechanism. Experiments The multifunctional rhodamine-modified chitosan (RMC) hydrogel for Hg 2+ adsorption with fluorescent turn-ON properties was fabricated through grafting the rhodamine-modified poly (ethylene glycol) benzaldehyde (RM-PEG) onto the hydrogel network serving as the fluorescence/colorimetric sensing receptor. The adsorption behaviors and colorimetric sensing mechanism of RMC hydrogel towards Hg 2+ were investigated in detail. Findings RMC hydrogel can remove more than 96.5% of Hg 2+ from aqueous solution with significant fluorescence response and colorimetric change. The high adsorption selectivity and colorimetric sensing mechanism of RMC hydrogel towards Hg 2+ can be explained by the hard and soft acid/base (HSAB) theory. The O atom in hydroxyl and carbonyl groups together with the N atom in amine/imine groups of RMC hydrogel play a vital role in the adsorption of Hg 2+ , while the colorimetric response and fluorescence enhancement of the hydrogel after adsorption are attributed to the specific spiro-lactam structure of rhodamine moieties. The adsorption isotherms and kinetics were investigated and well described by Freundlich isotherm and pseudo-second-order kinetic model . Furthermore, RM-PEG showed low cytotoxicity towards mouse embryonic fibroblast cells and RMC hydrogel can be used as a fluorescent pH indicator from 4.2 to 7.4, demonstrating the potential applications of RMC hydrogel in biological diagnosis.
研究领域:
环境科学
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生物材料学
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分析化学
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DOI
PubMed
高影响因子
Analytical Methods
·
2022
·Vol. 14
·期 23
·2318-2328
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IF 3.532
Qing Fan,Guang-Ming Bao,Si-Han Li,Si-Yi Liu,Xin-Ru Cai,Yi-Fan Xia,Wei Li,Xiao-Ying Wang,Ke Deng,Hou-Qun Yuan
Blue-fluorescent blood-CDs were synthesized through a one-pot hydrothermal method using a mixture of chicken blood and trisodium citrate and then explored as a fluorescent probe for detecting Fe3+ and Hg2+. The probe showed excellent selectivity and sensitivity towards Fe3+ and Hg2+ with a dramatic “on–off” fluorescence response. F− recovered the fluorescence quenching by Fe3+, and Al3+ recovered the fluorescence quenching by Hg2+, showing an “off–on” fluorescence response. The blood-CDs were used as an “on–off–on” dual-channel fluorescent sensor for the detection and discrimination of Fe3+ and Hg2+ ions. The probe showed wide linear ranges for determination of Fe3+ (0–100 μM) and Hg2+ (0–120 μM) with low detection limits of 0.23 μM for Fe3+ and 0.17 μM for Hg2+. This probe was practically applied for the determination of Fe3+ and Hg2+ in piggery feed and wastewater with good recoveries. This work provides a fluorescent probe for the quantification of Fe3+ and Hg2+ in livestock feed and environmental water samples.
研究领域:
分析化学
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环境科学
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生物医学
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DOI
PubMed
高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Jun Dai,Peipei Wei,Yujuan Wang
The addition of heteroatoms changes the structure and optical properties of carbon quantum dots (CQDs). In the paper, nitrogen (N)-doped CQDs are prepared via one-step hydrothermal method from Auricularia auricular and ethylenediamine. Transmission Electron Microscope (TEM) analysis reveals that the average size of carbon quantum dots is 5±2 nm, whereas the chemical study shows the existence of C-N bond. The produced N-doped CQDs have fluorescence quantum yields of 28.4%. Moreover, the prepared CQDs showed high sensitivity and accuracy and had a good proportional band of 0-50 μM for detection Hg 2+ (R 2 =0.9919) and Cd 2+ (R 2 =0.9964). The low detection limits were 77.21 nM and 101.55 nM for Hg 2+ and Cd 2+ , respectively. The CQDs was triumphantly used to track metal ions in environmental samples. So, it was a promising method for environmental pollutant detection.
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
MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Xiaojing Yang,Yingying Wang,Jingjing Xu,Mei-Xia Zhao
In recent years, carbon dots (CDs) have shown potential applications in fluorescence tracing and imaging due to their excellent optical and chemical properties. In this work, a new type of carbon dots (Cy7-CDs) with near-infrared absorption and emission was synthesized from cyanine dyes and polyethylene glycol by hydrothermal reaction. The prepared Cy7-CDs exhibited low toxicity and excellent biocompatibility, which were applied to detect the noble metal ions Au 3+ /Hg 2+ and glutathione via the ‘on–off-on’ mode. In addition, in vivo fluorescence images demonstrated that Cy7-CDs could efficiently accumulate in the tumor. Therefore, Cy7-CDs could act as a multi-functional probe for biological sensing and tumor diagnosis.
研究领域:
生物传感
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医学诊断
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
·
IF 4.831
Yuzhu Zhai,Yijing Li,Xiaoke Huang,Juying Hou,Houshen Li,Shiyun Ai
A colorimetric and ratiometric fluorescent dual-mode assay is constructed for sensitive and specific Hg 2+ sensing based on UiO-66-NH 2 and Au composite (UiO-66-NH 2 @Au). The addition of Hg 2+ stimulates the peroxidase-like activity of UiO-66-NH 2 @Au by the formation of Au-Hg amalgam, promoting the oxidizing of chromogenic substrate OPD to DAP with the aid of H 2 O 2 , which lead to the change of colorimetric and fluorescent signals. The absorbance of the sensing system at 450 nm is linear positive correlation with Hg 2+ concentration of 30–1400 nM and the color of the solution under visible light shaded from light yellow to dark yellow. With the increase of Hg 2+ concentration, the fluorescence signal at 570 nm (DAP) increased whereas that at 455 nm (intrinsic fluorescence of UiO-66-NH 2 ) decreased due to inner filter effect (IFE), the fluorescence intensity ratio (F 455 /F 570 ) decreasing linearly with Log [Hg 2+ ] over the range 60–1700 nM; the fluorescence emission of sensing system under UV excitation changed from blue to yellow, which can easily be discerned visually. This assay was successfully applied to the determination of Hg 2+ in tap water and river water. The results indicate that the colorimetric and ratiometric fluorescent dual-mode assay based on UiO-66-NH 2 @Au realized visual determination of Hg 2+ rapidly and reliably, revealed application prospect in Hg 2+ monitoring.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2022
·
IF 3.841
Li Huang,Yucheng Sun,Guozhi Zhao,Lizhen Wang,Xia Meng,Jianhua Zhou,Hongdong Duan
Mercury has complex biological toxicity and can cause a variety of physiological diseases and even death, so it is of great importance to develop novel strategies for detecting trace mercury in environmental and biological sample. In this work, a new type of green fluorescence sensor FLN based on fluorescein-carbazole was developed. FLN demonstrated a distinct fluorescence enhancing at 525 nm towards Hg 2+ ions due to the “PET-off” (Photoinduced Electron Transfer-off). The binding modes between FLN with Hg 2+ was found to be 1:1 by job plot analysis. The limits of detection of TR for sensing Hg 2+ is down to 40 nM. Especially with low toxicity, FLN was successfully applied for detecting Hg 2+ in living cells.
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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生物技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Jiao He,Lin Yun,Xinjian Cheng
Chitosan as the plentiful and easily available natural polymer, its solubility in organic solvents is still a challenge. In this article, three different chitosan-based fluorescent co-polymers were prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization. They could not only dissolve in several organic solvents, but also could selectively recognize Hg 2+ /Hg + ions. Firstly, allyl boron-dipyrrolemethene (bodipy) was prepared, and used as one of the monomers in the subsequent RAFT polymerization. Secondly, chitosan-based chain transfer agent (CS-RAFT) was synthesized through classical reactions for dithioester preparation. Finally, three methacrylic ester monomers and bodipy bearing monomers were polymerized and grafted as branched-chains onto chitosan respectively. By RAFT polymerization, three chitosan-based macromolecular fluorescent probes were prepared. These probes could be readily dissolved in DMF, THF, DCM , and acetone. All of them exhibited the ‘turn-on’ fluorescence with selective and sensitive detection for Hg 2+ /Hg + . Among them, chitosan-g-polyhexyl methacrylate-bodipy (CS-g-PHMA-BDP) had the best performance, its fluorescence intensity could be increased to 2.7 folds. In addition, CS-g-PHMA-BDP could be processed into films and coatings. When loading on the filter paper, fluorescent test paper was prepared and it could realize the portable detection of Hg 2+ /Hg + ions. These organic-soluble chitosan-based fluorescent probes could enlarge the applications of chitosan.
研究领域:
材料科学
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分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2022
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IF 5.895
Chang Liu,Yuye Li,Ting Chen,Shuyun Meng,Dong Liu,Daming Dong,Tianyan You
Efficient preconcentration is critical for sensitive and selective electrochemical detection of metal ions, but rapid specific enrichment with depressed absorption of interfering ions at the electrode is challenging. Here, we proposed an electric field-induced specific preconcentration to boost the analytical performance of DNA-based electrochemical sensors for Hg2+ detection. As for such preconcentration, a positive external electric field was first used to enrich Hg2+ at an electrode assembled with T-rich DNA, thus boosting T–Hg2+–T recognitions. The following applied inverse electric field strips the nonspecifically absorbed Hg2+ and other interfering ions, thus depressing matrix interferences via self-cleaning. Based on this principle, we designed a portable device to realize programmable control of electric fields; a T–Hg2+–T recognition-based electrochemical sensor was thus fabricated as a model platform to assess the feasibility of electric field-induced preconcentration. The experimental results revealed that such a strategy decreased the time of T–Hg2+–T-based recognition from 60 to 20 min and led to detection with better reproducibility by depressing the influence of free Hg2+ as well as interfering ions. This strategy offered Hg2+ detection limits of 0.01 pM─three-fold better than that without preconcentration─within 22 min. The proposed preconcentration strategy offers a new way to enhance the analytical performance of sensing at the solid–liquid interface.
研究领域:
分析化学
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环境科学
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生物传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 14
·9996-10003
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IF 3.9
Zijie Wei,Cuifeng Jiang,Jinshan Wang,Yue Chen
Metal organic framework (MOF)-derived nanostructures display remarkable characteristics and have broad application potential. Os@ZIF-8 nanocomposites were prepared by a depositional method. The Os nanoparticles distributed on the surface of ZIF-8. The nanocomposites displayed enhanced peroxidase-like activity with smaller Km for both 3,3′,5,5′-tetramethylbenzidine (TMB) and H2O2 compared to Os NPs due to the confinement effect and large surface area that ZIF-8 provided. From the average reaction rate constants obtained from three different temperatures, the activation energy values were determined. The kinetic data indicated that the Os@ZIF-8 NCs are catalytically more active than Os NPs. In addition, quantitative measurement of Hg2+ was performed based on the formation of Os–Hg alloy. Os@ZIF-8 NCs had a wide detection range between 0 μM and 71.43 μM for Hg2+ with a limit of detection (LOD) of 2.29 μM. Using a MOF with a large surface area to load Os nanoparticles to achieve enhanced nanozyme activity is the novelty of this work.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Kaiyu Zhang,Yuxin Sang,Yingdi Gao,Qinxing Sun,Weina Li
In this paper, a simple and effective fluorescence turn-on approach for highly sensitive and selective monitoring Hg 2+ ions was designed by using carbon dots (CDs) and silver nanoparticles (AgNPs). It reveals that the fluorescence of CDs solution can be quenched in the presence of AgNPs through inner filter effect (IFE) and the quenched CDs-AgNPs system is turned on after addition of Hg 2+ ions, which is due to higher affinity of Hg 2+ and AgNPs than that of CDs and AgNPs, thus resulting the disappearance of AgNPs from the CDs-AgNPs composites and leading to the fluorescence turn-on of CDs. The developed fluorescence turn-on approach exhibited high selectivity and sensitivity for detection of Hg 2+ . Under the optimum experimental conditions, good linearity was achieved over the range of 100–160 μM and the limit of detection (LOD) was estimated to be 2.22×10 -8 M for Hg 2+ . The recoveries of Hg 2+ spiked in real samples ranged from 98.4% to 101.6%. Results of this study suggest that the fluorescence turn-on approach can be used to the detection of Hg 2+ in real water samples.
研究领域:
分析化学
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环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Yiru Jia,Yi Pan,Haiying Wang,Rong Chen,Hua Wang,Xinjian Cheng
A fluorescent monomer of boron dipyrromethene (BODIPY) derivative ( 9AnPD) is designed and synthesized at first, and then it is introduced into polyurethane to obtain polymeric chemosensor with dangling fluorescent side groups. The monomer chemosensor 9AnPD exhibits highly selective properties to Hg 2+ ion in a wide pH range. The color of the monomer changed rapidly upon the addition of Hg 2+ ion. The fluorescence peak shifted and is enhanced about 4-flod. In addition, the monomer chemosensor reaches the detection limit of Hg 2+ is as low as 5 × 10 −6 m. When the fluorescent monomer is introduced to polymers, the sensing properties of the monomer chemosensor 9AnPD still remained. The polymer chemosensors not only exhibit fluorescence shift and color change for identifying Hg 2+ ion as its monomer chemosensor, but also improve the efficiency of detection. The detection limit of polymer chemosensor could reach 5 × 10 −7 m , and the fluorescence enhanced about 6-flod. The glass transition temperature (T g ) of the fluorescent PU is increased with the introduction of 9AnPD . However, it is about 60 °C, and will not lead to any adverse effect for the process. The molecular weights of PUs are lower than which without 9AnPD , but still of the macromolecular level.
研究领域:
材料科学
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分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2022
·Vol. 3
·期 8
·3593-3599
·
IF 0
Shanshan Xing,Chunqiu Xia,Xinyi Liu,Liangqia Guo,Fengfu Fu
A simple and green one-step method for the simultaneous exfoliation and functionalization of few-layered MoS2 nanosheets was developed via the ultrasonic treatment of bulk MoS2 powder in sodium phytate-containing aqueous solution. The as-prepared MoS2 nanosheets show high stability, low cytotoxicity and high adsorption capacity for Hg2+ in aqueous solution. The maximum adsorption capacity for Hg2+ is about 7.5 times and 3.7 times that of bulk MoS2 powder and unfunctionalized MoS2 nanosheets, respectively. The adsorption kinetics and thermodynamics indicate that the adsorption of Hg2+ is a monolayer chemical adsorption. Finally, the as-prepared MoS2 nanosheets were applied for the removal of Hg2+ in HepG2 cells and show a similar detoxification effect as that of the common antidote meso-2,3-dimercaptosuccinic acid, indicating the potential application of MoS2 nanosheets for biological detoxification.
研究领域:
材料科学
·
环境科学
·
生物医学工程
·
纳米技术
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）