CHEMOSPHERE
·
2022
·
IF 8.943
Sen Lu,Xuechuan Li,Yunkai Liao,Zhenghua Zhang,Haijian Luo,Guan Zhang
Photoelectrocatalytic (PEC) process combining the merits of photocatalysis and electrocatalysis is considered as a promising ammonia oxidation technology for water treatment . However, some key issues, such as the limited in situ generation of oxidants on photoanode, slow mass transfer problem and generation of nitrate/nitrite by–products hinder the further application of PEC process in the treatment of ammonia pollutant. In this study, the graphite felt (GF) cathodes modified by different transition metals (Ni, Fe, Mn, Co, Cu) were screened by physicochemical and photoelectrochemical characterizations. The results show that the Ni–GF cathode with more Ni 0 uniformly distributed on the GF surface had the best electrocatalytic activity to generate H 2 O 2 . The PEC system composed of 10.0 wt% Ni–GF cathode and optimized titania nanotubes (TNTs) photoanode selectively converted about 96.1% ammonia to N 2 within 90 min. Compared with the single TNTs photoanode system, the ammonia oxidation reaction rate constant of the synergistic PEC oxidation system was increased by about two times, which demonstrated the role of the oxidants simultaneously generated on both anode and cathode. The in situ generated reactive oxygen-based oxidants and chlorine-based oxidants interacted together, and ClO• acted a leading role in the ammonia oxidation which were confirmed by quenching and probe experiments. In addition, the contributions of •OH and ClO• were significantly improved in the synergistic PEC oxidation system, compared with the single TNTs photoanode system. Furthermore, the nitrate by–products generated by the ammonia oxidation were further reduced on the Ni–GF cathode. The large amount of active chlorine and active oxygen generated on the electrode diffused into the bulk, effectively overcoming the mass transfer limitation of direct oxidation. Therefore, the developed TNTs photoanode/Ni-GF cathode system can continuously and efficiently convert ammonia to N 2 without the formation of nitrate/nitrite by–products.
研究领域:
环境科学
·
水处理技术
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 10
·8673-8687
·
IF 2.324
Qin Qingyuan,Shi Qingdan,Sun Wen,Wan Junmin,Hu Zhiwen
The purpose of this research is to design and fabricate a novel ternary hybrid nanostructure heterojunction with high-efficiency visible-light-driven photocatalysis. The porous layered TiO 2 nanotubular structures (TNTs) with high percentage of photocatalytic reactive facets, which were turned into by commercially available TiO 2 , were wrapped on the surface of hydroxylation carbon nanotubes (CNTs) through the formation of Ti–O=C and/or Ti–O–C bond between CNTs and TiO 2 . Then the TNT@CNT nanotubular composites were coated by ultrathin g-C 3 N 4 nanosheets with a thickness of 3–4 nm. The ternary nanocomposites owned strong absorption performance, low charge recombination rates and high-efficiency photocatalytic activities, which were all owe to high surface areas and excellent adsorptivity of the CNTs, photocatalytic performance of TiO 2 nanotubes (TNTs) and moderate band gap of g-C 3 N 4 nanosheet. What’s more, the formation of chemical bonds greatly improved visible-light photocatalytic activity with a degradation rate of 98.2 and 97.9% for methylene blue and rhodamine B in 60 min under visible-light irradiation, which showed ~ 10 times enhancement compared to pure TiO 2 . In addition, the existence of h + and ·OH and ·O 2− radicals played main role in the photocatalytic process. The new material was of great significance to environmental protection and energy criss.
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 41
·期 3
·1129-1136
·
IF 3.277
Jian Wang,Zihui Meng,Min Xue,Lili Qiu,Xiao Dong,Zhibin Xu,Xuan He,Xueyong Liu,Jinshan Li
Molecularly imprinted polymer hollow spheres (MIHSs) were produced by using hexanitrohexaazaisowurtzitane (HNIW or CL-20) as a template, silica nanospheres as a sacrificial matrix, acrylamide as a functional monomer, ethylene glycol dimethacrylate as a cross-linker and acetonitrile as a porogen at 4 °C under UV irradiation. This sorbent was applied to the selective solid-phase extraction (SPE) of several explosives simultaneously by using a newly-developed SPE procedure. For the first time, 2,4,6-trinitrotoluene (TNT), 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX), 1,3,5,7-tetranitro-1,3,5,7-tetraazacyclooctane (HMX) and CL-20 were selectively extracted and determined simultaneously from simulated post-blast samples prepared from motor oil and vacuum pump oil. The matrix effects were successfully eliminated and accurate quantization was achieved. When the loading amounts of HMX, RDX, TNT and CL-20 were, respectively, below 10, 2, 5 and 20 nmol for 100 mg of MIHS, these explosives were almost retrieved completely (above 98%). For the MIHSs and non-imprinted polymer hollow spheres (NIHSs), in acetonitrile and methanol, the imprinting factors (IFs) of CL-20 and tetraacetyldibenzylhexaazaisowurtzitane (TADB, a structural analogue of CL-20) changed dramatically, from 7.75 to 1.57 and 0.88 to 2.39, respectively. It highlighted the significant effect of solvents on imprinted sites.
研究领域:
分析化学
·
材料科学
·
环境科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Minxin Cui,Yiwei Zhuang,Gang Zou,Bing Zhu,Qijin Zhang
In this work, evanescent field initiated “click” polymerization on the surface of the waveguide is used to fabricate composite optical fiber taper probe for sensing. This improvement can effectively keep the polymerization within the scale of evanescent field on the surface of the fiber taper and prevent it in the precursor solution. Besides, for special sensing requirements, such as sensing target and sensitivity, this novel approach (photo-plating) is convenient to choose ingredients composed of the precursor solution in fabrication of a corresponding composite fiber taper probe. The photo-plating process usually completes within 30 s in specific precursor solution. As an example, a probe with a fluorescent polymer film composed of meso-tetrakis(4-allyloxyphenyl) porphyrin (TAOP) was made, which provides the binding sites for the nitro-based explosive molecules. The results indicate that the probe exhibits a good sensitivity and repeatability to trinitrotoluene (TNT), providing a fiber probe platform with miniaturization, real-time and remote monitoring for the detection of TNT vapor.
研究领域:
光学工程
·
材料科学
·
传感技术
·
化学传感
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产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2012
·
IF 5.602
Yuqi Yu,Qiao Cao,Ming Zhou,Hua Cui
We report a novel homogeneous label-free aptasensor for 2,4,6-trinitrotoluene (TNT) detection based on an assembly strategy of electrochemiluminescent graphene oxide (GO) with gold nanoparticles (AuNPs) and aptamer . In this sensing strategy, the anti-TNT aptamer was first assembled with AuNPs to form aptamer–AuNPs. Then ruthenium(II) complex functionalized GO (denoted as Ru–GO) was assembled with aptamer–AuNPs by electrostatic interaction . AuNPs could directly quench the electrochemiluminescence (ECL) emission of ruthenium(II) complex on the surface of Ru–GO due to the energy transfer from luminophore to the AuNPs. Weak ECL signal of the assembly was obtained. In the presence of target molecule TNT, the aptamer–AuNPs would aggregate partly due to the aptamer–target interaction and reduce quenching effect, leading to ECL signal restoration and strong ECL signal was obtained. TNT in a range of 0.01–100 ng mL −1 could be detected by use of the ECL intensity discrepancy with a low detection limit of 3.6 pg mL −1 . The aptasensor also showed high selectivity towards TNT against 2,4-dinitrotoluene, p-nitrotoluene and nitrobenzene . The present aptasensor has been successfully applied to the detection of TNT in real water samples. Compared with previous reported sensors, this homogenous aptasensor avoided complicated labeling and purification procedure and showed magnificent sensitivity and high selectivity, which made it not only convenient but also time-saving and applicable. Furthermore, this sensing strategy also provides a promising way to develop new ECL aptasensor for other analytes by virtue of other aptamers.
研究领域:
分析化学
·
纳米技术
·
环境科学
·
传感器
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 184
·期 1
·73-80
·
IF 4.831
Shi Jian-Jun,Meng Lei-Xia,Yang Ping
The authors describe an electrochemiluminescence (ECL) assay for the determination of 2,4,6-trinitrotoluene (TNT) in soil. It is based on the finding that graphene quantum dots (GQDs) strongly enhance the ECL of CdSe quantum dots (CdSe QDs), and ECL is strongly quenched by TNT. In order to assemble the GQDs and CdSe QDs, the latter were functionalized with carboxy groups and then coupled to amino-functionalized GQDs (afGQDs). The resulting CdSe-GQDs conjugation was placed as a thin film on a glassy carbon electrode (GCE). The modified electrode displays an about 8-fold enhanced ECL intensity compared to an GCE with CdSe QDs only, and the onset potential of the ECL reaction is positively shifted by 140 mV. In the presence of TNT, the ECL is quenched due to the formation of the TNT-amine complex. The decrease in ECL intensity is related to the logarithm of the TNT concentration in the range from 0.01 to 100 ppb, with a detection limit as low as 3 ppt. The results of TNT assays in (spiked) soil samples showed recoveries between 99.2 and 105.0 % and relative standard deviations between 3.0 and 8.2 %. This strategy offers a new perspective for developing ECL assays based on the use of semiconductor nanoparticles and graphene-based nanomaterials.
A electrochemiluminescence (ECL) assay was developed for the detection of 2,4,6-trinitrotoluene (TNT). The method utilizes a combination of CdSe and graphene quantum dots (GQDs), and a glassy carbon electrode modified with poly(diallyldimethylammonium chloride)-protected graphene. The assay is simple and displays acceptable reproducibility.
研究领域:
分析化学
·
环境科学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Piaotong Liu,Yabin Wang,Weize Shi,Xin Li
Water contamination by explosive compounds and heavy metal ions poses serious risks to ecosystems and human health worldwide. Among them, 2,4,6-trinitrotoluene (TNT), a persistent nitroaromatic explosive, is frequently found in military and industrial wastewater, as well as residues from civilian blasting activities. Ferric ions (Fe 3+ ), commonly discharged through various industrial processes, also present a significant environmental threat. Therefore, the development of effective detection methods for both TNT and Fe 3+ in aquatic environments is of great importance for environmental monitoring and pollution control. Herein, we report a novel dual-emission ratiometric fluorescent probe, CNQDs/Eu-MOF-76, capable of simultaneously and selectively detecting both TNT and Fe 3+ in aqueous environments. The probe combines blue-green fluorescence from carbon quantum dots (CNQDs, 496 nm) and red fluorescence from Eu-MOF-76 (618 nm), enabling a distinct ratiometric response upon analyte recognition. It exhibits high sensitivity, with a detection limit for TNT as low as 0.4 nM and a linear range from 0 to 6.3 nM. Moreover, the probe shows excellent selectivity toward TNT and Fe 3+ over various common ions. Its practical applicability was validated in real water samples (river, tap, and drinking water), demonstrating satisfactory recoveries and good reproducibility. This strategy offers a rapid, cost-effective, and reliable tool for environmental monitoring and water quality protection.
研究领域:
环境科学
·
分析化学
·
材料科学
·
传感器与检测
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2022
·
IF 4.458
Chi Zhong,Peiyu He,Rui Yuan,Yi Sun,Hongyang Deng,Tinghong Zhang,Shuen Liang,Biao Kang,Guanjun Chang,Yewei Xu
A series of hydrophobic porous polymer containing isoxazoline and siloxane groups were successfully prepared via catalyst-free click polymerization and freeze-drying technology. In addition to hydrophobicity , synergistic effect of three molecular aborption interactions, namely point-to-point Lewis acid-base, point-to-face dipole-π, and face-to-face π-π interactions, endowed the resulting porous polymer with good 2,4,6-trinitrotoluene (TNT) adsorption efficiency from wastewater. At the same time, the adsorption efficiency of the resulting porous polymer in different natural/polluted water samples was similar to those in laboratory, and about 80% of the initial adsorption capacity remained after five adsorption-desorption cycles. The results showed that hydrophobic porous polymer containing isoxazoline and siloxane groups is a promising adsorbent for the treatment of TNT wastewater.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 12
·9598-9605
·
IF 3.201
Yajiao Song,Haichao Duan,Siyao Zhu,Jianhua Lü,Changli Lü
Novel temperature-responsive block copolymer-functionalized graphene oxide (GO) nanosheets were successfully prepared via non-covalent π–π stacking interactions between GO and pyrene-terminated PNIPAM-b-P(OEGMA-co-MQ). The pyrene-terminated block copolymer was synthesized by reversible addition fragmentation chain transfer (RAFT) polymerization using a pyrene functional RAFT agent and the monomers N-isopropylacrylamide (NIPAM), oligo(ethylene glycol) monomethyl ether methacrylate (OEGMA) and 5-(2-methacryloyl-ethyloxymethyl)-8-quinolinol (MQ). ZnS nanoparticles were also integrated into the block copolymer-decorated GO via the coordination of MQ units of the block copolymers to fabricate a fluorescent nanocomposite with good temperature-responsive behavior based on a conformation change in the PNIPAM blocks on the GO sheets. The as-prepared block copolymer anchored graphene oxide@ZnS NPs nanocomposite can be used as a fluorescent sensing platform for sensitive and selective detection of nitroaromatic explosive 2,4,6-trinitrotoluene (TNT) with a detection limit of 4.4 nM via a fluorescence resonance energy transfer (FRET) process.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hongyang Deng,Boyuan Zhang,Yewei Xu,Yong Zhang,Jichuan Huo,Lin Zhang,Guanjun Chang
This paper presents the application of click polymerization between an in situ generated nitrile oxide and polybutadiene leading to an isoxazoline-based porous polymer for the adsorption of 2,4,6-trinitrotoluene (TNT). Because the synergistic effect of dipole–π interaction and π–π interaction enlarges the binding area between the organic porous polymer and TNT, the resulting adsorbent exhibited efficient adsorption of TNT in water. The adsorption kinetics fit well with the pseudo-second-order model, and adsorption equilibrium could be achieved in 4.0 h. The Langmuir model exhibited better correlation for equilibrium data analysis, and the maximum adsorption capacity at 298 K was as high as 177.3 mg/g. The adsorption capacity remained relatively high after five desorption–adsorption cycles for acetone eluent. Additionally, no metal ion catalyst was added to this reaction, thereby avoiding secondary pollution. This click polymerization provides a simple, yet highly effective, method for the preparation of porous organic polymers to be used in the efficient adsorption of TNT, and the synergistic effect is believed to be a novel rationale for the design of TNT adsorption materials.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 7
·5305-5311
·
IF 3.84
Lingfeng Gao,Li Ju,Hua Cui
The measurement of the binding constant of specific interactions and concentration of a target is of considerable importance in clinical diagnosis, therapy, bioassays and drug design. The development of methods that combine high sensitivity with generalization and simplicity for the measurement of both binding constant and target concentration is highly desirable. Previously, we developed a label-free chemiluminescence (CL) strategy for the measurement of the target concentration and binding constants between DNA aptamers and target simultaneously based on the fact that the target could enhance the CL produced by the reaction of the N-(4-aminobutyl)-N-ethylisoluminol (ABEI) functionalized gold colloid with H2O2. In this study, the enhancement and inhibition effect of various targets on the CL reaction is studied. The generalization of the proposed CL strategy for various targets is also explored. The results demonstrate that the proposed CL strategy is suitable for targets that can cause a change in CL intensity, which includes enhancement and inhibition. It could be applied for the measurement of the dissociation constants of aptamer-binding targets, antibody–antigen complexes, protein-binding small molecules and double-strand DNA hybrids from the millimole to picomole level. It could also be used for the sensitive determination of target concentration, including 2,4,6-trinitrotoluene (TNT), dopamine, tetracycline, human IgG (hIgG), tuberculosis (TB) DNA and mannose, with the detection limit of 0.93 nM–4.1 fM. This strategy is of great potential in fundamental research as well as in applications in life sciences.
研究领域:
分析化学
·
生物化学
·
生物技术
·
临床诊断
·
药物设计
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产品关联
DOI
高影响因子
ACS Sensors
·
2023
·
IF 8.9
Xin Liu,Alei Dang,Tiehu Li,Yiting Sun,Tung-Chun Lee,Weibin Deng,Shaoheng Wu,Amir Zada,Tingkai Zhao,Hao Li
High sensitivity, good signal repeatability, and facile fabrication of flexible surface enhanced Raman scattering (SERS) substrates are common pursuits of researchers for the detection of probe molecules in a complex environment. However, fragile adhesion between the noble-metal nanoparticles and substrate material, low selectivity, and complex fabrication process on a large scale limit SERS technology for wide-ranging applications. Herein, we propose a scalable and cost-effective strategy to a fabricate sensitive and mechanically stable flexible Ti3C2Tx MXene@graphene oxide/Au nanoclusters (MG/AuNCs) fiber SERS substrate from wet spinning and subsequent in situ reduction processes. The use of MG fiber provides good flexibility (114 MPa) and charge transfer enhancement (chemical mechanism, CM) for a SERS sensor and allows further in situ growth of AuNCs on its surface to build highly sensitive hot spots (electromagnetic mechanism, EM), promoting the durability and SERS performance of the substrate in complex environments. Therefore, the formed flexible MG/AuNCs-1 fiber exhibits a low detection limit of 1 × 10–11 M with a 2.01 × 109 enhancement factor (EFexp), signal repeatability (RSD = 9.80%), and time retention (remains 75% after 90 days of storage) for R6G molecules. Furthermore, the l-cysteine-modified MG/AuNCs-1 fiber realized the trace and selective detection of trinitrotoluene (TNT) molecules (0.1 μM) via Meisenheimer complex formation, even by sampling the TNT molecules at a fingerprint or sample bag. These findings fill the gap in the large-scale fabrication of high-performance 2D materials/precious-metal particle composite SERS substrates, with the expectation of pushing flexible SERS sensors toward wider applications.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
表面科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）