RSC Advances
·
2014
·Vol. 4
·期 74
·39351-39358
·
IF 3.708
Li Wenfeng,Ma Hengchang,Lei Ziqiang
Detection of explosives is of utmost importance due to the threat to human security as a result of illegal transport and terrorist activities. Picric acid (PA) is widely used in the industrial and military fields, and is inadvertently able to contaminate the environment and groundwater, posing a threat to human health. Achieving the detection of explosives at the parts per billion (ppb) level using chemosensors is a great challenge. Herein, we demonstrate that triphenylamine based fluorescent chemosensors tris(4′-carbethoxybiphenyl) amine (TCEPA) and tris(4′-carboxybiphenyl) amine (TCPA) exhibit superior detection capability for PA in solution state at the ppb level (40 ppb and 5 ppb respectively) and efficient quenching behaviours in the vapor phase at room temperature. In addition, fluorescent test strips have been prepared by dip-coating Thin Layer Chromatography (TCL) for trace detection of PA at the attogram level.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 1
·1-8
·
IF 5.833
Gao Ruru,Wang Junhong,Wang Han,Dong Wei,Zhu Junwu
A new method based on coordination polymer nanoparticles (CPNs) derived from nucleotides and Tb 3+ ions (GMP/Tb) for the selective and sensitive determination of aqueous 2,4,6-trinitrophenol (TNP) (picric acid) is established. The fluorescence of GMP/Tb nanoparticles is effectively quenched by TNP via photo-induced charge transfer (PCT), thus achieving its selectivity toward TNP over other nitroaromatic explosives. The decreased fluorescence of GMP/Tb shows a good linear relationship to the concentrations of TNP ranging from 5.0 to 40.0 μM, and the limit of detection is 26.0 nM (5.96 ppb). The proposed GMP/Tb probe also achieves satisfactory results in real samples. The obtained recoveries of this method in river water samples are in the range 93.15–106.10%. The relative standard deviation (RSD) are 0.57 to 1.01% based on three repeated determinations. This fabricated detector provides a feasible path for determination of ppb-level TNP in natural water samples, which can help humans to avoid TNP-contaminated drinking water.
Graphical abstract
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RSC Advances
·
2015
·Vol. 5
·期 106
·87157-87167
·
IF 3.84
Ma Hengchang,Zhang Zhongwei,Jin Yuanyuan,Zha Lajia,Qi Chunxuan,Cao Haiying,Yang Zengming,Yang Zhiwang,Lei Ziqiang
Triphenylamine-decorated BODIPY derivative TBMA was designed and synthesized. Luminogen aggregation was developed by taking advantage of twisted intramolecular charge transfer (TICT) and aggregation-induced emission (AIE) processes. In non-polar solvents, the locally excited (LE) states of BODIPY luminogens emitted intense yellow light. Increasing solvent polarity brought the luminogens from an LE to a TICT state, causing a large bathochromic shift in the emission color and a dramatic decrease in emission efficiency. The red emission was greatly boosted by aggregate formation or AIE effect. We also discovered that TBMA could be applied as an efficient chemical sensor for picric acid (PA) detection. The detection limit and quenching constant (KSV) were determined as 30 ppb and 2.1 × 10−6 M−1 respectively. 19F NMR and 1H NMR titration analysis verified that F⋯H hydrogen bonding is demonstrated as the mode of interaction, which possibly facilitates effective exciton migration.
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ANALYST
·
2015
·Vol. 141
·期 3
·1091-1097
·
IF 4.107
Jian Rong Zhang,Yuan Yuan Yue,Hong Qun Luo,Nian Bing Li
Picric acid (PA) explosive is a hazard to public safety and health, so the sensitive and selective detection of PA is very important. In the present work, polyethyleneimine stabilized Ag nanoclusters were successfully used for the sensitive and selective quantification of PA on the basis of fluorescence quenching. The quenching efficiency of Ag nanoclusters is proportional to the concentration of PA and the logarithm of PA concentration over two different concentration ranges (1.0 nM–1 μM for the former and 0.25–20 μM for the latter), thus the proposed quantitative strategy for PA provides a wide linear range of 1.0 nM–20 μM. The detection limit based on 3σ/K is 0.1 nM. The quenching mechanism of Ag nanoclusters by PA is discussed in detail. The results indicate that the selective detection of PA over other nitroaromatics including 2,4,6-trinitrotoluene (TNT), 2,4-dinitrotoluene (2,4-DNT), p-nitrotoluene (p-NT), m-dinitrobenzene (m-DNB), and nitrobenzene (NB), is due to the electron transfer and energy transfer between PA and polyethyleneimine-capped Ag nanoclusters. In addition, the experimental data obtained for the analysis of artificial samples show that the proposed PA sensor is potentially applicable in the determination of trace PA explosive in real samples.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Kai Li,Run-Hui Yu,Cheng-Mei Shi,Fu-Rong Tao,Tian-Duo Li,Yue-Zhi Cui
An electrospun membrane (CB-PS) was prepared by electrospinning technique from a solution of aggregation induced emission (AIE) active compound 5-( N -carbazole styryl)-1,3-dimethyl-barbituric acid (CB) and polystyrene (PS) in DMF/THF. The membrane was electrospun upon amino-functionalized glass [G-NH 2 ], producing a fluorescent sensor [CB-PS]/[G-NH 2 ] for detecting picric acid (PA). The AIE-active compound were highly photostable and the sensor [CB-PS]/[G-NH 2 ] exhibited high selectivity and sensitivity for the detection of PA over nitroaromatics (NACs) in aqueous phase. The quenching constant ( K SV ) to PA was obtained to be 3.29 × 10 4 M −1 in aqueous phase with a limit of detection (LOD) up to 228 ppb. Selectivity study demonstrates that common interferents have an insignificant effect on the emission intensity of the fluorescent nanofibers in aqueous phase, while reusability study indicates that the fluorescent nanofibers can be regenerated. Real water sample was also tested, and negligible matrix effect on explosives detection was observed. The fluorescence quenching by PA can be attributed to the photo-induced electron transfer (PET) in the quenching process. This research provides new insights into the application of AIE-active materials in fluorescent nanofibrous explosive sensor.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 3
·1757-1762
·
IF 1.354
Deng Xiang,Huang Xiaomei
A facile photoluminescent probe for picric acid (PA) detection was developed using photoluminescent carbon nanodots (C-dots), which was obtained from a traditional Chinese medicinal material Sichuan Bergamot via a one-step hydrothermal method for the first time. The as-prepared photoluminescent
C-dots show favorable blue color photoluminescence with the maximum emission at 440 nm. It has been successfully applied as a photoluminescent probe for the detection of PA. This photoluminescent probe exhibits excellent sensitivity and selectivity toward PA from 0.4 μM to 80 μM
with correlation coefficient (r) of 0.9987. The limit of detection (LOD) for PA is 82 nM. Furthermore, the proposed C-dots for photoluminescent probe detection of PA in real water samples (river water, refinery wastewater and pharmaceutical factory wastewater) by adding 5 μM
and 20 μM PA with satisfactory recoveries from 99.5% to 101.5%. These novel photoluminescent C-dots is promising in environmental analysis of PA.
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高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2017
·Vol. 35
·期 4
·447-456
·
IF 1.852
Zhongyu Ding,Hongqing Li,Wanqing Gao,Yiquan Zhang,Chunhua Liu,Yuanyuan Zhu
The synthesis of two linear terpy-based metallo-supramolecular fluorescent coordination polymers through 1∶1 complexation of Zn 2+ and Cd 2+ ions with ditopic terpyridine ligand was reported. The dispersibility of P1 and P2 was significantly improved in organic solvent and water through the introduction of hydrophilic oligo-ethyoxy side chain. Two polymers displayed yellow light emission both in solution and the solid state due to the intra-ligand charge transfer (ILCT) between the d 10 metal ions and the conjugated spacer unit. These coordination polymers were explored as fluorescent chemosensors for detecting picric acid in aqueous media, displaying high sensitivity and good selectivity. In addition, test strips were prepared from these polymers and exhibited the practical potential of detecting the NACs pollutants in the outdoor water for public safety and security.
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RSC Advances
·
2022
·Vol. 12
·期 52
·33696-33705
·
IF 4.036
Hongbo Wu,Liu Yang,Wei Sun,Ping Yang,Honglong Xing
In this work, a nanocomposite suitable for long-term storage was constructed for efficient and highly selective detection of picric acid (PA). For this purpose, nitrogen-doped carbon dots (N-CDs) were synthesized by a simple hydrothermal reaction one-step method, and the synthesized nitrogen-doped carbon dots were loaded into amine-modified mesoporous silica nanoparticles (MSN-NH2) to form N-CDs@MSN-NH2 nanocomposites. The as-synthesized N-CDs@MSN-NH2 was detected by X-ray photoelectron spectroscopy (XPS) and the Fourier transform infrared (FT-IR) analysis methods. After being coated with MSNs, the as-synthesized N-CDs@MSN-NH2 exhibits excellent photo-stability in storage for 60 days at room temperature. Furthermore, PA can significantly quench the fluorescence signal of N-CDs@MSN-NH2 through the fluorescence resonance energy transfer (FRET) effect, while other metal ions and nitro compounds only cause little change. The a-synthesized composites were used to detect PA with a detection limit of 50 nM in an aqueous solution. These results indicate that the synthesized composites have promise for application in PA detection in aqueous solution.
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MICROCHIMICA ACTA
·
2018
·Vol. 186
·期 1
·1-7
·
IF 5.705
Qi Wenjing,He Hongkun,Fu Yuling,Zhao Maoyu,Qi Lin,Hu Lianzhe,Liu Chun,Li Rong
Water-dispersed fluorescent silicon nanodots (SiNDs) were synthesized by a one-pot hydrothermal method starting from tetraethyl orthosilicate (TEOS) as silicon source and trisodium citrate as reducing reagent. The method is simple and convenient. The SiNDs, with excitation/emission peaks at 347/440 nm and with fluorescence quantum yield of 18% are shown to be viable fluorescent probes for picric acid (PA). The SiNDs strongly bind PA, and their blue fluorescence is quenched. The distance between the donor and acceptor (R 0 value) is calculated from fluorescence data to be 2.1 nm. A fluorometric method was worked out that has a linear response in the 8 nM to 50 μM PA concentration range and a 0.92 nM limit of detection. The method has a fast response (2 min) and is well selective over other nitroaromatic compounds and metal ions. The average recoveries from spiked lake water samples ranged between 98.4 and 100.8%.
Water-dispersed fluorescent silicon nanodots (SiNDs) are synthesized using tetraethyl orthosilicate (TEOS) and trisodium citrate. Based on spectral overlap of fluorescent spectrum of SiNDs and absorption spectrum of picric acid (PA), fluorometric determination of PA at concentrations as low as 0.92 nM is achieved.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Tongmou Geng,Zongming Zhu,Xie Wang,Hongyu Xia,Yu Wang,Dengkun Li
Two thiophene-based and carbazole-based conjugated microporous polymers (PTPATTh and PTPATCz) with triphenylamine core structural monomers were synthesized via straight forward anhydrous ferric chloride oxidative coupling polymerization. We first explored the fluorescent sensing performance of thienyl CMPs for picric acid (PA) and investigated comparatively the porosity and fluorescence sensing property for PA/p-nitrophenol (NP). Thanks to the propeller-like structure, high porosity, extended π-conjugation and electron-rich characteristics, the both CMPs exhibited strong fluorescent emission properties and worked as fluorescent chemosensors toward electron-deficient nitroaromatic analytes. The suspension of PTPATTh and PTPATCz given rise to the high luminescence, and showed a white and yellow emission in both THF and DOX excited under 365 nm using a UV lamp, respectively. Though BET surface area values and response speed of PTPATTh (594 m 2 g −1 ) are lower than that of PTPATCz (894 m 2 g −1 ), PTPATTh display higher selectivity for tracing PA than PTPATCz in DOX and THF. In short, the PTPATTh may be a new kind of material for detecting PA.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Tingting Luo,Yiqi Li,Yanxue Xu,Shiting Zhang,Yujue Wang,Xingming Kou,Dan Xiao
In this article, a hyperfluorescence 2-pyridone derivative (D-TPCA) has been synthesized within 5 min by the microwave-assistant heat treatment of the aqueous mixture of citric acid and 2-aminoethanethiol hydrochloride. The as-prepared D-TPCA exhibited good aqueous solubility and excellent fluorescent property with a quantum yield of 89.9%. Because the fluorescence of D-TPCA could be effectively quenched by picric acid (PA), D-TPCA could be served as a “turn-off” fluorescence sensor for PA in aqueous solution. The proposed sensing method permitted a selective and sensitive detection of PA in a linear range of 0–45 μM with a detection limit of 56.0 nM. The determination results of PA in real water samples with a recovery range of 95.4–107.3% confirmed a good analytical performance of this sensor. In addition, the possible sensing mechanism has been discussed in detail.
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INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2023
·
IF 2.6
Yanteng Xiao,Junqiu Zhang,Yaoming Liu,Yingte Wang,Sijie Cheng,Yong Zhang
Here, yellow fluorescent sulphur-doped carbon dots (S-CDs) with high quantum yield (QY) of ~27.9% were synthesised from m-cresol purple by a fast and low-cost one-step hydrothermal method without other reagents. The surface morphology, functional groups and optical properties of S-CDs were characterised by high-resolution transmission electron microscope (HRTEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectrum and ultraviolet visible (UV-vis) absorption. The fluorescence intensity of S-CDs can be specifically and stably quenched by picric acid (PA) through inner filtration effect (IFE). The linearity between fluorescent intensity and PA concentration was used for developing a fluorescent probe with detecting range of 0–259.0 μM and a detection limit as low as 14.6 nM. We developed the method by applying S-CDs to determine PA in lake water with recoveries in the range of 93.0–103.7%, which verified the feasibility of this probe in practical analysis. In addition, due to the low toxicity and good biocompatibility, S-CDs can be applied to biological imaging.
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