JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Wei Chen,Shu-Chang Wu,Zhi-Jun Xia,Guo-Bo Huang,Jun Hu
In this research, we rationally designed and synthesized quantum dots self-decorated SnIn 4 S 8 /g-C 3 N 4 (QDs-SISCN) nanocomposites by in situ anchoring quantum dot (QDs) self-decorated SnIn 4 S 8 (SIS) nanosheets onto the surface of mesoporous graphite carbon nitride (CN) nanosheets in a mixed solvothermal environment. The photoreduction of 4-nitroaniline (4-NA) was used to assess their photocatalytic activity. In this framework, the construction of CN nanosheets-supported QDs-decorated SIS homojunctions can integrate the advantages of both homojunctions and heterojunctions . Benefiting from those favourable properties, the QDs-SISCN nanocomposites exhibit superior photocatalytic activity towards 4-NA reduction under visible-light irradiation (λ > 400) as a result of the optimizied amount of CN nanosheets added. The recycling experiments also reveal high stability of the QDs-SISCN nanocomposites during photocatalytic reactions for 4-NA reduction. Moreover, the investigation of the photocatalytic mechanism from systematic characterizations, including measurements of the photocurrent response, electrochemical impedance spectroscopy (EIS) and photoluminescence (PL) indicate that the improved separation efficiency of charge carriers is a critical parameter for the enhanced photocatalytic activity for 4-NA reduction. We expect this research to provide a promising path to the design and synthesis of highly efficient hybrid photocatalysts for functional-group transformations.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 412
·期 23
·5653-5661
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IF 3.637
Xie Wei,Zhang Jian,Zeng Yanbo,Wang Hailong,Yang Yiwen,Zhai Yunyun,Miao Dongwei,Li Lei
A novel molecularly imprinted fluorescent sensor for the determination of 4-nitroaniline (4-NA) was synthesized via free radical polymerization with 3-[(7-methoxy-2-oxo-2 H -chromen-4-yl)methyl]-1-vinyl-1 H -imidazol-3-ium bromide as the fluorescence functional monomer, 4-NA as the template molecule, ethylene glycol dimethacrylate as the cross-linker, and 2,2′-azo(bisisobutyronitrile) as the initiator. The obtained fluorescent poly(ionic liquid) was characterized through Fourier transform infrared, scanning electron microscopy, Brunauer–Emmett–Teller analysis, and fluorescence spectrophotometry. The fluorescent sensor had high fluorescence intensity, short detection time (0.5 min), good selectivity, and excellent sensitivity (limit of detection = 0.8 nM) for 4-NA, with good linear relationships of 2.67–10,000 nM. The practical applicability of the fluorescence sensor in detecting 4-NA in industrial wastewater and spiked environmental water was demonstrated, and a satisfactory result was obtained.
Highly sensitive and selective detection of 4-nitroaniline in water by a novel fluorescent sensor based on molecularly imprinted poly(ionic liquid)
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
Nanoscale Research Letters
·
2015
·Vol. 10
·期 1
·1-8
·
IF 2.779
Shi Chaohong,Zhu Nengwu,Cao Yanlan,Wu Pingxiao
The development of green procedure for the synthesis of gold nanoparticles (AuNPs) has gained great interest in the field of nanotechnology. Biological synthetic routes are considered to be environmentally benign and cost-effective. In the present study, the feasibility of AuNPs’ synthesis via intracellular protein extract (IPE) of Pycnoporus sanguineus was explored. The characteristics of generated particles of formation, crystalline nature, and morphology and dimension were analyzed by UV-vis spectroscopy, X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. UV-vis spectra exhibited strong absorption peaks in 520 to 560 nm, indicating the formation of AuNPs. XRD analysis revealed that the formed AuNPs were purely crystalline in nature. TEM observation showed that AuNPs with various shapes including spherical, pseudo-spherical, triangular, truncated triangular, pentagonal, and hexagonal, ranging from several to several hundred nanometers, were synthesized under different conditions. The average size of AuNPs decreased from 61.47 to 29.30 nm as the IPE addition increased from 10 to 80 mL. When the initial gold ion concentration changed from 0.5 to 2.0 mM, the average size rose from 25.88 to 51.99 nm. As in the case of solution pH, the average size was 84.29 nm with solution pH of 2.0, which diminished to 6.07 nm with solution pH of 12.0. Fourier transform infrared (FTIR) analysis implied that the functional groups including hydroxyl, amine, and carboxyl were involved in the reduction of gold ions and stabilization of AuNPs. The catalysis results showed that 0.019 mg of AuNPs with average size of 6.07 nm could catalyze the complete degradation of 12.5 μmol of 4-nitroaniline within 6 min and the degradation rate increased drastically with the addition of AuNPs. All the results suggested that the IPE of P. sanguineus could be potentially applied for the eco-friendly synthesis of AuNPs.
研究领域:
纳米技术
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环境科学
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生物学
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DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Shuangying Li,Qingxiang Zhou,Zhi Li,Menghua Liu,Yanhui Li,Chunmao Chen
2,4-Dinitroaniline is a multifunctional product and has been applicated in various fields. It has absorbed much concerns due to its large consumption and occurrence in many environmental matrices. It is urgent to explore reliable and sensitive measurement technology. Present study described an outstanding fluorescence sensor constructed with carbon dots (CDs) derived from vitamin B 1 . The CDs were fabricated by dealing with a facile hydrothermal process, and exhibited good water solubility, fluorescence stability and highly fluorescence quenching characteristics in presence of 2,4-dinitroaniline. The excitation and emission wavelengths of the obtained CDs were 305 and 378 nm, respectively. The sensor displayed good selectivity and sensitivity for 2,4-dinitroaniline. Good linearity can be achieved in two-stage of 0.2–3 μmol L −1 and 3–20 μmol L −1 . The sensor earned low detection limit for 2,4-dinitroaniline down to 0.05 μmol L −1 . The sensor has been commendably employed for analysis of 2,4-dinitroaniline in real aqueous samples with spiked recoveries in the range of 95.0–99.6%. The proposed sensor provided a promising alternative for analysis of environmental pollutants or other meaningful employment.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
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IF 4.539
Jinming Ma,Huizhen Deng,Zhe Zhang,Lexin Zhang,Zhihui Qin,Yaru Zhang,Lili Gao,Tifeng Jiao
In this study, a series of Ag 3 PO 4 /PPy/PANI ternary composite catalysts were fabricated by adjusting the mixed solution of pyrrole and aniline with different volume ratios of 4:1, 3:2, 1:1, 2:3, and 1:4, and combining with the in-situ synthesis method. The synthesized Ag 3 PO 4 /PPy/PANI nanoparticles were examined by XRD , SEM, TEM and EDX , Raman spectroscopy . When the ratio of pyrrole and aniline is 1:1, the polymerized PPy/PANI acted as the supporting matrix to effectively immobilize and prevent the aggregation of Ag 3 PO 4 nanoparticles. The catalytic performances of the Ag 3 PO 4 /PPy/PANI composites were confirmed for reduction of 2-nitroaniline (2-NA) and 4-nitrophenol (4-NP) in the presence of NaBH 4 at room temperature by UV–vis spectroscopy. Results showed that the catalytic reduction effect of the Ag 3 PO 4 /PPy/PANI (1:1) on 2-NA is obviously better than that on 4-NP, which followed the pseudo-first-order kinetic, and the corresponding rate constants are 0.0053 min −1 and 0.022 min −1 , respectively, indicating that it has potential application in wastewater treatment in industries.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Qin Li,Yang Xia,Chao Yang,Kangle Lv,Ming Lei,Mei Li
Facing the requirement of modern industrial development, selective reduction of 4-nitroaniline (4-NA) into p-phenylenediamine (PPD) via a facile, economic and eco-friendly photocatalysis technique has attracted more and more attention in recent years. In this study, ZnIn 2 S 4 (ZIS) nanosheets grew in-situ on the surface of TiO 2 hollowspheres through a hydrothermal method and formed a direct Z-scheme heterojunction composite, which exhibited exceedingly better photocatalytic 4-NA reduction performance than bare ZIS and TiO 2 . Such enhancement was mainly attributed to the dissimilar dimensionalities, intimate contact, and matchable band edge positions between ZIS and TiO 2 semiconductors. Moreover, the substantial mechanism for the photocatalytic reaction in the ZIS/TiO 2 system was reasonably proposed. Inspired by recent applications of the Z-scheme heterostructured materials in solar energy conversion and artificial photosynthesis, this work would arouse an increasing interest in designing more Z-scheme photocatalyst systems with high efficiency and extensive applications.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
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IF 4.8
Ma-Lin Cui,Guo-Shi Zhang,Ze-Wen Kang,Xiao-Yan Zhang,Qing-Fan Xie,Miao-Ling Huang,Bing-Qing Wang,Da-Peng Yang
A facile strategy was proposed for the preparation of two fluorescent iridium nanoclusters of IrNCs-1 and IrNCs-2 by heating IrCl 3 in N, N -dimethylacetamide (DMA) and N -Methylformanilide (MFA), respectively. The DMA and MFA are amide compounds and contain electron-rich oxygen and nitrogen atoms. They can be used as electron donors and a fraction of electron charge was transferred to Ir atom to form ligand-to-metal charge transfer (LMCT) complexes. The Ir atoms can be stabilized in LMCT complexes via accepting and localizing the electron density. These LMCT complexes with excellent fluorescent property were defined as the IrNCs. They exhibited obvious excitation wavelength-dependent emission behavior. The emission bands of two IrNCs showed red-shifting with the increasing of excitation wavelength based on the effect of “inhomogeneous broadening”. The IrNCs-1 possessed concentration-dependent emission behavior. With the decreasing of IrNCs-1 concentrations, the fluorescence spectra showed remarkable blue-shifting due to the destruction of intermolecular hydrogen bonds between IrNCs-1. In the presence of p-nitroaniline (p-NA), the fluorescence of IrNCs-1 was significantly quenched and the fluorescence bands red-shifted strongly. According to the Stern-Volmer quenching behavior under different reaction temperature and absorbance spectra of IrNCs-1 in the presence and absence of p-NA, the dynamic quenching mechanism was included. Based on these findings, the fluorescence sensor for p-NA determination was developed with the linear range of 0.1–40 μM and the limit of detection (LOD) of 50 nM. The proposed sensor was successfully applied in the p-NA determination of tap water and lake water samples, suggesting that the novel IrNCs will be a promising candidate as a luminescence sensor.
研究领域:
分析化学
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材料科学
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DOI
高影响因子
Reaction Chemistry & Engineering
·
2021
·Vol. 6
·期 12
·2259-2265
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IF 4.239
Zhou Lan,Yangcheng Lu
A strategy of dissolving chlorine gas in 1,2-dichloroethane as the chlorine source for a liquid–liquid two-phase chlorination reaction was proposed in this study to resolve the problems of low efficiency, strong corrosivity, and poor controllability of traditional gas–liquid chlorination. Taking the chlorination reaction of 4-nitroaniline to synthesize 2,6-dichloro-4-nitroaniline as an example, the feasibility of the liquid–liquid chlorination method was verified in a microflow system. It can achieve 98.3% conversion and 90.6% selectivity within 1.6 s under the optimized reaction conditions. The recycling of HCl and 1,2-dichloroethane solvents was facile, and after three runs of recycling the chlorination reaction can still maintain good conversion and selectivity. The influence of feed mixing and the reaction networks on chlorination of 4-nitroaniline were also explored as a guide for process design. Compared with the traditional gas–liquid chlorination, the reaction efficiency of liquid–liquid two-phase chlorination is greatly improved, and it has a prospect for industrial application in terms of safety and controllability.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2023
·Vol. 7
·期 16
·3365-3372
·
IF 7
Hua-Long Li,Jing-Yi Cao,Ze-Dong Yu,Guang Yang,Zeng-Min Xue,Chuan-Zeng Wang,Wen-Xuan Zhao,Yi Zhao,Carl Redshaw,Takehiko Yamato
Nitroaniline (NA) is a kind of high toxicity and pathogenic amine derivative, and the trace monitoring of nitroaniline has become an urgent problem in terms of both the environment and security. Herein, two K-region multiple substituted pyrene-based luminogens with reasonable photoluminescence efficiency and blue emission (408–430 nm) have been synthesized and characterized. Their photophysical properties were carefully investigated in solution and in the solid state by experimental and density functional theory (DFT) methods. It is worth mentioning that both of these π-electron rich and extended π-conjugated materials were used for the detection of electron deficient nitroaromatics (NACs) based on a photo-induced electron transfer (PET) mechanism, and a sensitive response towards NA, especially for p-NA with a limit of detection (LOD) as low as 8.58 × 10−9 M, was observed, with a fluorescence quenching efficiency up to 99.5%. These research results provided a low-cost and simple strategy for trace nitroaniline sensing.
研究领域:
环境科学
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分析化学
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材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Sidra Chaudhary,Xuhao Zhang,Yi Bai,Simo Ma,Yong Wu,Qinxiang Jia,Xiaoyong Li,Yang Sun
This study introduces an innovative method for synthesizing multifunctional water-retaining agents via ammonium persulfate-initiated alkaline copolymerization of sodium humate with diverse functional components. The resulting materials exhibit exceptional and reproducible water/saline absorbing capabilities, outstanding water retention performance, and remarkable UV resistance. Structural characterization demonstrates that sodium humate's graphite backbone can be either preserved or modified depending on the copolymerized components, with polyvinyl alcohol (37.41–93.82 g g −1 ) and polyvinyl pyrrolidone (39.23–97.66 g g −1 ) composites showing particularly superior water absorption properties over 18 recycling cycles. A significant discovery is the concurrent formation of ammonium nitranilate, a high-energy-density salt, whose production from humic acid not only confirms Stevenson's structural model featuring quinone moieties but also offers an economical alternative to conventional chloranil-based synthesis that requires hazardous chlorine gas and expensive precursors. This work thus accomplishes dual breakthroughs: developing high-performance irrigation materials for arid regions while establishing a highly effective valorization pathway for humic acid to produce valuable energetic compounds.
研究领域:
高分子化学
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农业工程
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材料科学
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环境化学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2012
·
IF 5.625
Weiming Wu,Linrui Wen,Lijuan Shen,Ruowen Liang,Rusheng Yuan,Ling Wu
Photoreduction of 4-nitroaniline to p -phenylenediamine over TiO 2 , ZnO, PbBi 2 Nb 2 O 9 and CdS photocatalysts in the presence of CH 3 OH was investigated under light irradiation ( hv ≥ band gap) upon purging with N 2 . Compared with PbBi 2 Nb 2 O 9 and CdS, TiO 2 and ZnO showed photocatalytic activities for the photoreduction of 4-nitroaniline. Electron spin resonance analysis results revealed that a methanol radical could be detected in the present of TiO 2 and ZnO. Its formation was attributed to the reaction between the hydroxyl radical and CH 3 OH molecule. The species had strong reductive ability, and therefore could reduce 4-nitroaniline to p -phenylenediamine. Other alcohols (C 2 H 5 OH and i -C 3 H 7 OH) were also found to be efficient additives for the photoreduction of 4-nitroaniline. The results of the 2 H-labeled experiments indicated that the p -phenylenediamine formation was formed by the hydrogen transfer reaction between the 4-nitroaniline and H 2 O molecules. A mechanism was proposed to explain the photoreduction of 4-nitroaniline to p -phenylenediamine in the present alcohols.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Xing Lu,Yiwen Yang,Yanbo Zeng,Lei Li,Xiaohua Wu
Rapid and efficient detecting trace amount of environmental p -nitroaniline ( p -NA) is in urgent need for security concerns and pollution supervision. In this work we report the use of molecularly imprinted polymeric ionic liquid (MIPIL) microspheres to construct recognizable surfaces for detection of p -NA through fluorescence quenching . The p -NA imprinted microspheres are synthesized by precipitation polymerization upon co-polymerization of 3-(anthracen-9-ylmethyl)-1-vinyl-1H-imidazol-3-ium chloride (Fluorescent IL monomer) with ethyleneglycol dimethacrylate (EGDMA). The electron-rich group alkenyl imidazole in IL functional monomer can dramatically improve the emission of anthracene fluorophore and the π-π stacking, electronic, and hydrogen bond between p -NA and MIPIL can efficiently enhance the selective recognition force. The as-synthesized MIPIL microspheres present spherical shape, high fluorescence emission intensity and specific recognition, which showed rapid detection rate (1 min), stable reusable property (at least 4 time recycles), wonderful selectivity over several structural analogs, wide linear range (10 nM to 10 M) with a correlation coefficient of 0.992, and excellent sensitivity (LOD, 9 nM). As synthesis and surface functionalization of MIPIL microspheres are well established, the methods reported in this work are facile, rapid and efficient for monitoring p -NA in environmental wastewater.
研究领域:
环境科学
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分析化学
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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）