JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Mengyue Zhu,Lei Guo,Zhongyi He,Riadh Marzouki,Renhui Zhang,Elyor Berdimurodov
N -doped carbon quantum dots (NCQDs) were synthesized by a hydrothermal method using folic acid and o-phenylenediamine as precursors. The inhibition behaviour of the NCQDs on Q235 steel in 1 M HCl solution was appraised through electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves (PDP), and surface analysis. The results demonstrated that the synthesized NCQDs had an effective anticorrosion effect on Q235 steel, and the corrosion inhibition efficiency of 150 mg/L NCQDs reached 95.4%. Additionally, the analysis of the PDP corrosion potential changes indicated that the NCQDs acted as a mixed corrosion inhibitor. Moreover, the NCQDs adsorbed onto the surface of steel by coordinating its electron-rich atoms with the iron metal to form a protective film, which slowed the dissolution reaction of the anodic metal to achieve corrosion inhibition. The adsorption mechanism of the NCQDs was consistent with Langmuir adsorption, including physical and chemical adsorption. Therefore, this work can inspire and facilitate, to a certain extent, the future application of doped carbon quantum dots as efficient corrosion inhibitors in pickling solutions.
研究领域:
材料科学
·
电化学
·
防腐蚀研究
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DOI
PubMed
高影响因子
ACS Omega
·
2024
·
IF 3.7
Yun-qiong Yang,Yuan Zhang,Yang Liu,Feier Lin,Hao Zhang
The construction of tunable white-light-emitting materials has garnered increasing attention in the scientific community. In this study, N-doped carbon dots (N-CDs) were surface-modified with carboxylatopillar[5]arene (CP[5]) using an EDC–NHS coupling reaction to create CCDs. CCDs were then conjugated with rhodamine 6G (R6G) through host–guest interactions to fabricate the CCDs–R6G composites. These composites produced two-color fluorescence emission peaks at 447 and 557 nm when excited by a wavelength of 340 nm. Excitingly, white-light emission (0.28, 0.30) can be readily achieved by varying the R6G concentration. To further explore potential applications, a new detection method for rutin (RT) based on the inner filter effect (IFE) was developed. Experimental results verify the practicality and reliability of the fluorescence sensor based on CCDs–R6G composites for RT detection in real samples.
研究领域:
材料科学
·
分析化学
·
生物医学
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DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2020
·
IF 4.613
Xiufen Liao,Congjin Chen,Ruxia Zhou,Quanlong Huang,Qinglong Liang,Zuqiang Huang,Yanjuan Zhang,Huayu Hu,Yanglin Liang
In this study, N-doped carbon dots (N-CDs) synthesized from the main components of plants, including cellulose (N-cCDs), lignin (N-lCDs), and xylose (N-xCDs), were compared. TEM, XRD , FT-IR, and XPS were carried out to characterize their morphology and chemical composition. Results show that the three obtained N-CDs contained N-doped sp 2 and sp 3 hybrid carbon core, which was surrounded by oxygen- and nitrogen-containing functional groups. The three N-CDs exhibited a novel double excitation-one emission phenomenon, and their fluorescence were significantly enhanced by N-doping. Moreover, this study indicated that high lignin-containing biomass is not appropriate for producing CDs by hydrothermal method . Cellulose is conducive to produce CDs, while it needs a relatively high temperature and a long time. Low-molecular carbohydrate-rich biomass and nitrogen-containing biomass is the better carbon source to produce the CDs. Also, this study revealed that N-cCDs and N-xCDs are excellent candidates for fluorescent ink, fabrics identifying, temperature sensing, and Hg 2+ sensing. Due to its poor fluorescence property, N-lCDs is not suitable for fluorescent ink and fabrics identification.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Jiangyao Wu,Yan Dong,Xueyun Yang,Cheng Yao
The preparation of N-doped carbon dots (N-CDs) was facile and efficient by the hydrothermal method , using diethylenetriamine (DETA) and citric acid (CA) as nitrogen source and carbon source, respectively. The fluorescence of N-CDs was effectively quenched by Fe 3+ . Upon addition of hydroxylamine hydrochloride (HH) to N-CDs/Fe 3+ complex dispersion, the fluorescence of N-CDs was significantly recovered. Therefore, we developed an “off-on” fluorescence assay for the detection of HH using N-CDs/Fe 3+ as a fluorescence probe. The fluorescence intensity showed linearity with the added HH concentration ranging from 0 to 100 μM with the detection limit of 0.246 μM (S/N = 3). The proposed N-CDs sensing showed high selectivity and sensitivity to detection HH in aqueous solution.
研究领域:
分析化学
·
生物传感
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DOI
高影响因子
Food Chemistry-X
·
2024
·
IF 6.5
Doudou Lei,Lingling Li,Pengyue Song,QingBin Xu,Lihua Huang,Xiao Ma,Lidong Zhou,Weijun Kong
Glyphosate (Gly) is a widely-used herbicide in food production, while, the residue of which due to the long-term and excessive overspray poses serious threats to public health. The development of reliable methods for its sensitive detection is of great urgency. In this study, a novel ratiometric fluorescent nanosensor by encapsulating N-doped carbon dots (N-CDs) and gold nanoclusters (AuNCs) in zeolitic imidazole framework-8 (ZIF-8) as the dual-emissive fluorescence probes at 410 and 650 nm, respectively, was constructed for Gly detection. Due to the adsorption property of ZIF-8, the N-CDs/AuNCs@ZIF-8 nanoprobes accumulated Cu 2+ to quench the red fluorescence of AuNCs, and the blue fluorescence of N-CDs was stable. While thiocholine, a product of acetylthiocholine, hydrolyzed by acetylcholinesterase could coordinate with Cu 2+ , resulting in significant fluorescence recovery of AuNCs. This phenomenon was utilized for the quantitation of Gly, due to its inhibitory effect on acetylcholinesterase activity. By calculating the fluorescence intensity ratio ( I 650 /I 410 ), Gly in real sample could be accurately determined in a concentration range of 2–100 ng/mL with a limit of detection of 1.92 ng/mL because of the anti-interference and the self-correction ability of the two fluorescence signals. The N-CDs/AuNCs@ZIF-8 nanoprobes-assisted ratiometric fluorescent nanosensor exhibited unique merits of rapid construction, simple operation, high specificity, and good accuracy for Gly in edible and medicinal malt samples with recoveries of 93.7–108.2 %. This study presents a multiple tool for the versatile sensing of trace pesticides in more food matrices, which can be extended to a full range of environmental and food safety applications.
研究领域:
分析化学
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食品安全
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环境科学
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Xuejian Xing,Li Huang,Shaojing Zhao,Jiafu Xiao,Minhuan Lan
S,N-doped carbon dots (S,N-CDs) were facilely prepared via a hydrothermal method by using thiourea and citric acid (CA) as precursors. The as-prepared S,N-CDs exhibited high stability in aqueous solution and were applied for fluorometric detection of tetracyclines (TCs). The approach was developed on the basic of the fluorescence of S,N-CDs at 440 nm, which was selectively quenched by TCs through the inner filter effect (IFE) mechanism. Moreover, the fluorescence of TCs with maximum at 600 nm could be used as the internal standard signal, resulting in a fluorometric spectral response. The limit of detection (LOD) was 0.25, 0.39 and 0.26 μM for tetracycline (TC), doxycycline (DC) and oxytetracycline (OTC), respectively. Furthermore, S,N-CDs were successfully utilized for the detection of residual TCs in fish and pork samples with acceptable recovery and good RSD.
研究领域:
分析化学
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环境科学
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食品科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
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IF 9.446
Fengliang Wang,Ping Chen,Yiping Feng,Zhijie Xie,Yang Liu,Yuehan Su,Qianxin Zhang,Yingfei Wang,Kun Yao,Wenying Lv,Guoguang Liu
In this study, a novel visible-light-driven N-doped carbon dot (NCDs)/g-C 3 N 4 composite was successfully synthesized by loading NCDs nanoparticles onto the interlayers and surface of g-C 3 N 4 via a facile polymerized method. The photocatalytic activity of the NCDs/g-C 3 N 4 was remarkably higher than that of g-C 3 N 4 and CDs/g-C 3 N 4 toward the degradation of indomethacin (IDM) under visible light irradiation. With increasing NCDs loading volumes, the photocatalytic activity of NCDs/g-C 3 N 4 initially increased, and then decreased. A very low NCDs content of 1.0 wt% resulted in a 13.6 fold higher reaction rate than that of pristine g-C 3 N 4 . This enhanced photocatalytic activity might have been ascribed to the unique up-converted PL properties, efficient charge separation, as well as bandgap narrowing of the NCDs. Reactive species (RS) scavenging experiments revealed that superoxide radical anions (O 2 −) and photogenerated holes (h + ) played key roles during the photocatalytic degradation of IDM. The quantification of O 2 − showed that NCDs/g-C 3 N 4 formed a larger amount of O 2 − than that of pristine g-C 3 N 4 . Potential photocatalytic pathways of IDM were proposed through the identification of intermediates using HPLC–MS/MS and the prediction of reaction sites based on Frontier Electron Densities (FEDs) calculations, which involved decarboxylation, hydroxylation, as well as the addition and cleavage of indole rings. Toxicity and mineralization evaluations revealed that NCDs/g-C 3 N 4 provided a very desirable performance for the toxicity reduction and mineralization of IDM under longer exposures of visible light irradiation.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
LUMINESCENCE
·
2023
·Vol. 38
·期 2
·188-195
·
IF 2.9
Xin Wang,Changjian Zhu,Xuerong Yan,Sijie Cheng,Yong Zhang
N-doped carbon dots (N-CDs) were synthesized from L -glutamine and triethanolamine using a one-step hydrothermal method. The N-CDs emitting blue fluorescence had selective responses to tetracyclines (TCs) and could be used as a fluorescent probe to realize the quantitative detection and qualitative analysis of TCs. A method for the determination of TCs using the N-CDs in actual samples was successfully established. The recovery rate was maintained at 97.50–105.60%, and the relative standard deviation (RSD) was less than 3%. In addition, TCs can be visually distinguished using filter paper by the different fluorescence colours (light green, dark blue, and yellow-green) of the N-CDs/TCs system under ultraviolet light. This study provides a relatively simple method to detect and identify TCs.
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
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 1
·1-10
·
IF 5.3
Yang Dou,Shao Tong,Wang Xiaoshuang,Hong Min,Li Rui,Li Chenzhong,Yue Qiaoli
New portable hydrogel sensors for Al 3+ and Fe 3+ detection were designed based on the aggregation-induced emission (AIE) and color change of N-doped carbon dots (N-CDs). N-CDs with yellow fluorescence were prepared by a one-pot hydrothermal method from 2,5-dihydroxyterephthalic acid and acrylamide. The fluorescence of N-CDs was enhanced by Al 3+ about 20 times and quenched by Fe 3+ . It was interesting that although Fe 3+ showed obvious quenching on the fluorescence of N-CDs it did not cause a noticeable change in the fluorescence of N-CDs + Al 3+ . The colorless solution of N-CDs appeared blue in the presence of Fe 3+ without the influence of Al 3+ . Therefore, the turn-on fluorometry and colorimetry systems based on N-CDs were constructed for the simultaneous detection of Al 3+ and Fe 3+ . Furthermore, the portable sensing of Al 3+ and Fe 3+ was realized with the assistance of hydrogel, filter paper, cellulose acetate, and cellulose nitrate film. The proposed approach was successfully applied to the detection of Al 3+ and Fe 3+ in food samples and cell imaging. Graphical Abstract
研究领域:
分析化学
·
材料科学
·
环境科学
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DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Xiaoman Li,Yuanhua Liu,Haiming Huang,Jianhua Cheng
Photocatalysis-self-Fenton combining photocatalytic production of H 2 O 2 with Fenton reaction has been a hotspot, but the pH limitation and iron sludge production problems remain unsolved. Herein, we proposed a self-fenton system based on N-doped carbon dots modified ZnIn 2 S 4 (NCDs@ZnIn 2 S 4 ) composites that exhibits effective degradation of antibiotics under neutral pH using low amounts of Fe 2+ . The decoration of ZnIn 2 S 4 with NCDs significantly increased the surface area, visible light absorption, charge transfer ability and oxygen adsorption ability. NCDs@ZnIn 2 S 4 composites exhibited a high H 2 O 2 production rate (1528 μM g −1 •h −1 ) under visible light, which was 1.9 and 5.3 times higher than ZnIn 2 S 4 and NCDs, respectively. Meanwhile, the Fe 2+ /NCDs@ZnIn 2 S 4 system with a low concentration of Fe 2+ (1 mg/L) could remove over 95% levofloxacin and oxytetracycline within 30 min. Interestingly, the highest degradation efficiency occurred under neutral pH. Quenching experiments and analytical measurements indicated that the high catalytic performance under pH = 7 with low amounts of Fe 2+ stemmed from the higher amount of inner-generate H 2 O 2 under neutral pH and easy regeneration of Fe 2+ by photoinduced electrons for high •OH yields. Additionally, the Fe 2+ /NCDs@ZnIn 2 S 4 system exhibited high degradation performance under different water matrix and ultrahigh degradation efficiency towards levofloxacin under real sunlight irradiation. The work shows the prospects of photocatalysis-self-Fenton systems for overcoming the pH limitation and the difficulty of iron sludge separation in the purification of effluents.
研究领域:
环境科学
·
材料科学
·
光催化
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Hao Wu,Lan-Fang Pang,Na Wei,Xiao-Feng Guo,Hong Wang
We reported N-doped CDs (MTCDs) with excellent nucleus-targeted ability for selectively detecting ClO − . MTCDs can be easily prepared using m -phenylenediamine and 1,2,3-propanetricarboxylic acid as precursors through a solvothermal method. The maximum excitation/emission wavelengths were located at 444/513 nm, with QYs calculated to be 11.4 %. The fluorescence of MTCDs could be selectively quenched by ClO- upon the other ions, reactive oxygen species (ROS) and reactive nitrogen species (RNS). The quenching coefficient showed a good linearity versus C ClO - in the range of 1–100 μM, with detection limit of 0.48 μM. MTCDs were found to have splendid nuclear localization capabilities in MCF-7, Hela and H1299 cells and were successfully applied to image ClO − in cell nucleus and zebrafishes. During the nuclear localization mechanism study, we found a very interesting phenomenon: MTCDs were rare negatively charged CDs targeting nucleus by binding to the groove of DNA through hydrogen bond, which were different with most reported positively charged nucleus-targeted CDs via electrostatic adsorption. This finding proved that negatively charged CDs could also win the nucleus-targeted ability. Besides, this work provided a new strategy for designing nucleus-targeted CDs as well as the research of targeted release of drugs and cancer treatment.
研究领域:
生物化学
·
医学影像
·
药物设计
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DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2017
·
IF 1.932
Wei Song,Hai-Juan Zhang,Ying-Hua Liu,Cui-Ling Ren,Hong-Li Chen
A new facile fluorescence probing strategy, which was based on N -doped carbon dots (NCDs) and methyl parathion hydrolase (MPH), was developed for the determination of parathion-methyl (PM). The fluorescence intensity of NCDs-MPH system was proportional to PM concentration in the range of 2.38–73.78 μmol/L, with a detection limit of 0.338 μmol/L. Moreover, the present simple and facile method could be used to determine methyl parathion in environmental and agricultural samples successfully. Furthermore, the detection mechanism of this system is inner filter effect and molecular interactions between NCDs and p -nitrophenol, which is the hydrolysis product of PM catalyzed by methyl parathion hydrolase.
研究领域:
环境科学
·
分析化学
·
生物化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）