Polymers
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2020
·Vol. 12
·期 1
·83
·
IF 3.426
Lu Li,Tiantian Meng,Wanbin Zhang,Ying Su,Juan Wei,Xinwei Shi,Guanghua Zhang
The detection of p-nitrophenol (PNP) is of great significance for assessment of environment pollution and potential health risks. In this study, based on inverse opal polymeric photonic crystals (IOPPCs), a selective and visual sensor for high-performance PNP detection is developed. Due to their unique optical properties, IOPPCs report events by change of color, which can easily be observed by the naked eye. Hydroxyethyl methacrylate (HEMA) was selected as the functional monomer with which to fabricate the IOPPCs. By precisely adjusting the molar ratio between the functional monomer and the crosslinker, the sensors were only able to be sensitive to a specific solution, thus realizing the visual, selective, and semi-quantitative detection of PNP. When the sensors were immersed in different concentrations of PNP solution, their Bragg diffraction wavelengths showed different redshifts. The color of the IOPPCs changed from green to red as the peak shift of Bragg diffraction occurred. In addition, the IOPPCs displayed good interference immunity and reusability.Keywords:polymeric photonic crystals;structural color;p-nitrophenol
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Yaoping Hu,Zhijin Gao
Million tons of sewage sludge produced yearly creates a severe pollution problem to environment, and thus needs either to be properly disposed of, or recovered. Here, we demonstrate a value-added utilization of sewage sludge by converting its contained organics into nanosized carbon dots (CDs) with microwave irradiation. This synthetic method, using waste resources as precursors and avoiding the requirement of hazardous reagents and complex procedures, has the great advantage of low cost, environmental friendliness, and easy scalability. The resultant CDs exhibit excellent fluorescence properties with a large quantum yield (QY) of up to 21.7%, higher than the most values of waste-derived CDs. It is found that CDs can serve as a sensitive and selective sensor to detect para-Nitrophenol (p-NP), a toxic pollutant, through fluorescence quenching, giving a linear detection range of 0.2–20 μM and a detection limit of as low as 0.069 μM. Systematic investigations suggest that the inner filter effect (IFE) is the dominant sensing mechanism. Moreover, the practical applications of CDs for p-NP assay in real water samples achieve good results.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Quan Chen,Chaoran Ma,Wenyan Duan,Di Lang,Bo Pan
Biochar is an attractive class of materials because of its various feedstock and wide application potential in agricultural and environmental remediation activities. Recent studies have suggested that biochar may both adsorb and degrade organic contaminants ; however, the properties of biochar that control its apparent interactions with organic contaminants are still unknown. In this study, p -nitrophenol was chosen as a model organic pollutant . Its adsorption and degradation by biochar were investigated with a special focus on correlations with the biochar properties. The apparent removal of p -nitrophenol by biochars increased with the increase of pyrolysis temperature. After acetonitrile extraction of the biochars, p -nitrophenol adsorption increased while degradation decreased. Thus, there was no significant change in the apparent removal of p -nitrophenol across eight reaction cycles. An analysis of the physicochemical properties of biochar showed that p -nitrophenol adsorption was determined by the biochar surface area, while the degradation may be because of the varying compositions of biochars, including free radicals , functional groups determining its redox activities, and transition metals. The relative importance of these compositions varied with the pyrolysis temperature. More extensive study is warranted on the relationship between biochar properties and reactivity for targeted biochar production and application. The results of this study provide fundamental information on biochar preparation and its application in organic pollutant removal .
研究领域:
环境科学
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农业科学
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DOI
高影响因子
PROCESS BIOCHEMISTRY
·
2018
·
IF 2.616
Feng Cheng,Feifei Cheng,Jianyong Zheng,Guanzhong Wu,Yinjun Zhang,Zhao Wang
Only a few esterases have been used for the synthesis of optically pure fungicide. For example, ( R )-metalaxyl synthesized using esterase-involved bioreaction displays fungicide activity, whereas ( S )-enantiomer is redundant. However, the biosynthesis of ( R )-metalaxyl is currently hampered by the lower activity, selectivity and thermostability of esterase. Therefore, to obtain a better biocatalyst, several esterase genes were cloned from Pseudochrobactrum asaccharolyticum WZZ003. The esterase PAE07, among eight enzymes, was selected because it exhibited the highest hydrolysis activity toward ( R , S )-DMPM. The DNA and amino acid sequence analysis suggested that PAE07 is a new member of lipolytic enzyme family V. The enzymatic properties of PAE07 toward ( R , S )-DMPM and model substrate ( p- nitrophenyl acetate) were investigated. PAE07 was found to be a highly active esterase with excellent enantioselectivity . The reaction conditions including temperatureand pH were optimized, and the effects of metal ions, organic solvents and detergents were also investigated. Results indicated that PAE07 is a competitive candidate for ( R )-metalaxyl manufacturing.
研究领域:
生物化学
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酶工程
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农药合成
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Yiwei Li,Yaohong Ma,Eric Lichtfouse,Jin Song,Rui Gong,Jinheng Zhang,Shuo Wang,Leilei Xiao
Para-Nitrophenol ( p -nitrophenol) is a common industrial pollutant occurring widely in water bodies, yet actual monitoring methods are limited. Herein we proposed a fully electrochemically in situ synthesized graphene-polyarginine composite functionalized screen printed electrode, as a novel p-nitrophenol sensing platform. The electrode was characterized by morphologic, spectrometric and electrochemical techniques. p -nitrophenol in both pure aqueous solution and real water samples was tested. Results show a detection limit as low as the nanomolar level, and display a linear response and high selectivity in the range of 0.5–1250 μM. Molecular simulation reveals a detailed synergy between graphene and poly-arginine. The preferable orientation of nitrophenol molecules on the graphene interface in the presence of poly-arginine induces H- and ionic binding. This sensor is an ideal prototype for p -nitrophenol quantification in real waters.
研究领域:
环境科学
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材料科学
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分析化学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2017
·
IF 1.174
Jianhua Chen,Xue Sun,Lijing Lin,Xinfei Dong,Yasan He
In the present paper, a metal–organic framework Cr-BDC was prepared and used as adsorbent for adsorption of o -nitrophenol (ONP) and p -nitrophenol (PNP) from aqueous solutions. Cr-BDC was characterized by scanning electron microscopy, transmission electron microscope, X-ray diffraction and BET methods. The results indicate that Cr-BDC gets a very large specific surface area of 4128 m 2 ·g − 1 and pore sizes are concentrated in 1 nm, which is a benefit for using for wastewater treatment . The influences of the adsorption conditions, such as temperature, solution concentration, adsorption time and reusability on adsorption performance were investigated. Cr-BDC exhibited an encouraging uptake capacity of 310.0 mg·g − 1 for ONP, and adsorption capacity of Cr-BDC for ONP is significantly higher than that for PNP under suitable adsorption conditions. The characterizations of adsorption process were examined with the Lagergren pseudo-first-order, the pseudo-second-order kinetic model, and the intra-particular diffusion model. Kinetics experiments indicated that the pseudo-second-order model displayed the best correlation with adsorption kinetics data. Furthermore, our adsorption equilibrium data could be better described by the Freundlich equation. The results indicate that the as-prepared Cr-BDC is promising for use as an effective and economical adsorbent for ONP removal.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Hai-Bo Wang,Bei-Bei Tao,Ning-Ning Wu,Hong-Ding Zhang,Yan-Ming Liu
A simple and highly selective fluorescence biosensor has been exploited for p -nitrophenol ( p -NP) and alkaline phosphatase (ALP) activity detection based on the glutathione-stabilized copper nanoclusters (GSH-CuNCs) mediated-inner filter effect (IFE). The GSH-CuNCs were prepared by employing GSH as stabilizer and ascorbic acid (AA) as reductant. The obtained GSH-CuNCs exhibited a strong blue fluorescence emission at 420 nm with an excitation wavelength of 365 nm, which overlapped largely with the absorption spectra of p -nitrophenol ( p -NP). Therefore, the luminescence of GSH-CuNCs could be quenched by p -NP through inner filter effect. In addition, ALP catalyzed the substrate p -nitrophenyl phosphate ( p -NPP) to form p -nitrophenol ( p -NP), which also leading to the fluorescence quenching of GSH-CuNCs. The fluorescent strategy was realized for the sensitive determination of p -NP and ALP activity with the promising limit of detection of 20 nM (for p -NP) and 0.003 mU⋅mL −1 (for ALP). Furthermore, the method could be applied to detect the p -NP content in river water samples and ALP activity in human serum samples.
研究领域:
分析化学
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生物医学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 24
·8862
·
IF 3.748
Huihui Chen,Mei Yang,Jun Yue,Guangwen Chen
A facile and one-step route has been employed for the synthesis of highly uniform CoOOH nanorings assembled on the surface of reduced graphene oxide (CoOOH/rGO nanocomposite). The physicochemical properties of the obtained CoOOH/rGO nanocomposite were characterized using X-ray diffraction pattern (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2physical adsorption (BET) and X-ray photoelectron spectroscopy (XPS). The TEM and SEM results confirmed that CoOOH nanorings (edge length ∼ 95 nm) were uniformly decorated on reduced graphene oxide nanosheets using the simple precipitation–oxidation–reduction method. When used as a catalyst for the reduction of p-nitrophenol to p-aminophenol in the presence of excess NaBH4, the resulting CoOOH/rGO nanocomposite exhibited good activity and stability. When the initial concentration of p-nitrophenol was 1.25 × 10−4mol·L−1, p-nitrophenol could be fully reduced within 3.25 min at room temperature. The apparent rate constant was estimated to be 1.77 min−1, which is higher than that of pure CoOOH nanorings. Moreover, p-nitrophenol could still be completely reduced within 6 min in the fifth successive cycle. The superior catalytic performance of the nanocomposite is attributed to the synergistic effect between the highly dispersed CoOOH nanorings and the unique surface properties of the reduced graphene oxide nanosheets, which greatly increased the concentration of p-nitrophenol near CoOOH nanorings on reduced graphene oxide surface and improved the local electron density at the interface.Keywords:cobalt oxide;reduced graphene oxide;nanorings;catalysis;p-nitrophenol;reduction
研究领域:
材料科学
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化学
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DOI
PubMed
高影响因子
Current Nanoscience
·
2024
·Vol. 20
·期 2
·264-271
·
IF 1.4
Zhang Yu,Zhang Ping
Background: In this study, ampicillin sodium fluorescent carbon quantum dots were prepared by one-step hydrothermal method with ampicillin sodium as the carbon source and urea as the nitrogen source. Methods: The structure of CQDs were characterized by UV-Vis and fluorescence spectrophotometer.
The pH, reaction time and ionic strength of phenol detected by N-CQDs were optimized. The optimum experimental conditions were 40 μL ampicillin sodium N-CQDs, 2 mL buffer solution with pH 8.0, and the reaction time was 6 min. Results: Through the detection of fluorescence spectrophotometry,
p-nitrophenol had obvious fluorescence quenching phenomenon on ampicillin sodium N-CQDs, and the detection limit was 75 nM. It was used in the standard addition experiment of actual samples, and the recovery rates were more than 85%. Conclusion: Therefore, the N-CQDs could
be used as fluorescent probe to analyze the content of p-nitrophenol in the actual environment.
研究领域:
分析化学
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药物分析
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环境科学
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DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Limin Hu,Peng Wang,Guoshuai Liu,Qingzhu Zheng,Guangshan Zhang
In this study, Fe 3 O 4 and microwave (MW) were combined to activate persulfate (PS) for the removal of organic matter, resulting in the enhanced degradation of p -nitrophenol (PNP) in solution. During the preparation of Fe 3 O 4 , the effect of sodium acetate was examined, and the results showed that the concentration of sodium acetate had little effect on the catalytic activity of the Fe 3 O 4 /PS/MW system but did have an effect on the Fe 3 O 4 yield. In addition, with regards to the representative environmental factors, the degradation experiment showed that humic acid and the co-existing anions of chloride, sulfate, nitrate, and phosphate had little effects on p -nitrophenol removal; however, carbonate had a negative effect. In addition, the Fe 3 O 4 /PS/MW system performed well in the initial pH range of 3.0–9.0. According to the quenching experiment and electron paramagnetic resonance (EPR) detection, sulfate radicals and a minority of hydroxyl radicals play dominant roles in the degradation process. In addition, the role of Fe 3 O 4 was confirmed to take part in the degradation process by X-ray photoelectron spectroscopy (XPS) analysis. Because of the good performance observed in the water matrices of tap water and the Songhua River, these results demonstrate the potential application of the Fe 3 O 4 /PS/MW system for wastewater treatment .
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
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IF 8.4
Huiwen Wang,Sihao Wu,Zoujun Peng,Xiulin Wang,Juanhua Lai,Ping Qiu
The quantitative analysis of glyphosate has significant implications for the evaluation of food quality and environmental safety risks. First, copper nanoparticles (Cu NPs) were synthesized using cetyltrimethylammonium bromide (CTAB) as a stabilizing agent, which resolved the limitation associated with atmospheric oxidation of Cu NPs and provided excellent fluorescence stability. Interestingly, the fluorescence of blue-emitting CTAB-Cu NPs was quenched by pH-responsive p-nitrophenol (p-NP) via Förster resonance energy transfer. Herein, a dual read-out sensor based on CTAB-Cu NPs and p-NP was constructed for glyphosate detection. Specifically, acetic acid (HAc) from acetylcholine (ACh) via hydrolysis catalyzed by acetyl cholinesterase (AChE) reduced the pH of the mixed solution and prevented the loss of protons from p-NP, which allowed the fluorescence emission by CTAB-Cu NPs. The presence of glyphosate inhibited the activity of AChE, and the increased pH resulted in proton loss. The fluorescence intensity of CTAB-Cu NPs was quenched, and the solution color changed from colorless to yellow with a UV absorption peak at 400 nm. The sensor can detect ultra-trace levels of glyphosate residues with a limit of detection of 5.43 ng/L. The obtained biosensor was successfully utilized to monitor the degradation of glyphosate in the roots of cabbage and cultivated soil.
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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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Guang-En Yuan,Yan-Ge Ma,Kangning Huangfu,Yunbei Li,Xin Zhang,Fenglin Yang
Advanced oxidation processes based on the combination of zero-valent iron (ZVI) and S(IV) have been extensively investigated for oxidative degradation of organic pollutants, but little attention has been paid to their reducing capacities in the presence of oxygen. This work found bisulfite (BS) could greatly enhance the degradation of p-nitrophenol (PNP) by ZVI under oxic conditions and PNP was only reduced to p-aminophenol without further degradation. A combination of indirect reduction by superoxide radical (O 2 •– ) and direct reduction by ZVI was verified as the mechanism of PNP degradation. Highly oxidizing species, such as hydroxyl radical (HO • ) and sulfate radical (SO 4 •− ), were also produced in the ZVI/BS system under oxic conditions but did not contribute to pollutant degradation perhaps due to the rapid consumption by reducing substances like BS ions and the released Fe 2+ . BS concentration, ZVI dosage, initial solution pH and coexisting anions (CO 3 2– , PO 4 3– and Cl – ) affected the degradation of PNP. ZVI lost the reactivity after used for three times because of the production of goethite and lepidocrocite covered on its surface. This study will provide a new insight into degradation of organic pollutants in ZVI/BS system under oxic conditions.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
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