CHROMATOGRAPHIA
·
2016
·Vol. 79
·期 5
·327-333
·
IF 1.332
Peng Xiaofeng,Wang Huawen,Yang Binbin,Zhan Xin,Wu Yiwei
To improve the sensitivity of capillary electrophoresis, field-amplified sample injection (FASI) was developed to determine bisphenol A (BPA), α -naphthol ( α -NAP) and β -naphthol ( β -NAP) in drinks and lake water. Parameters (sample matrix, concentration of NaCl, water plug length, sample injection time and voltage) affecting FASI have been systematically investigated. Under optimum conditions, the sensitivity was improved 17.1-, 15.8- and 9.9-fold for BPA, α -NAP and β -NAP, respectively. The detection limits of BPA, α -NAP and β -NAP were 0.071, 0.038 and 0.081 μg mL −1 and the proposed method has been successfully applied to detect BPA, α -NAP and β -NAP in drinks and lake water with recoveries of 82.0–109.3 %.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Wei Chen,Jiayue Dong,Sihan Zhou,Chunyong Zhang,Degang Fu
1-naphthol (1-NAP) and 2-naphthol (2-NAP) are both hazardous pollutants which pose great threat to our living environment. In the current work, a comparative investigation on the electrochemical mineralization of 1-NAP and 2-NAP using boron-doped diamond (BDD) anode was presented. Experiments were carried out using synthetic 1-NAP or 2-NAP solutions containing Na 2 SO 4 as supporting electrolyte . A two-level factorial design methodology was adopted to optimize the mineralization process, six mathematical models were thus constructed and used to explore the structure-property relation involved. The results obtained suggested that 1-NAP was easier and faster to break down than 2-NPA under the same oxidation conditions, which were in line with the outcome obtained from cyclic voltammetry , HPLC and TOC measurements. To understand the destruction mechanism, the electron structures of 1-NAP and 2-NAP were further examined by the quantum chemistry calculations with density functional theory. It was also found that the results from frontier orbital analysis could well explain the differing mineralization performances recorded in BDD anode cell. Finally, with the aid of LC/MS analysis, the oxidation pathways of 1-NAP or 2-NAP on BDD anodes were proposed.
研究领域:
环境科学
·
电化学
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DOI
高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 3
·901-908
·
IF 2.482
Wu Yuting,Yang Long,Wu Bo,Li Jie,Liu Binyao,Ke Gaili,Dong Faqin,Zhou Yong,He Huichao
It has been reported that β -MnO 2 has photocatalytic activity for the oxidative-coupling of 2-naphthols into 1,1′-bi-2-naphthols. Nevertheless, it is hard to exclude the possibility that the oxidative-coupling of 2-naphthols is initiated by β -MnO 2 catalysis in dark due to the insufficient investigations in the related reports. In the present work, the oxidative-coupling of 2-naphthols into 1,1′-bi-2-naphthols with different phases MnO 2 catalysis in dark and under visible-light irradiation were systematically investigated. The results revealed that the oxidative-coupling of 2-naphthols is jointly initiated by MnO 2 catalysis and O 2 -oxidation, not by MnO 2 photocatalysis. Among the α -MnO 2 , β -MnO 2 , γ -MnO 2 and δ -MnO 2 catalysis, β -MnO 2 catalysis has the optimal performance, its selectivity for the oxidative-coupling of 2-naphthols into 1,1′-bi-2-naphthols is close to 100%, and its catalytic capacity could be well retained after multiple using. Our findings provide comprehensive and accurate understanding the catalytic role of MnO 2 for the oxidative-coupling of 2-naphthols into 1,1′-bi-2-naphthols. Graphic In the present work, the oxidative-coupling of 2-naphthols into 1,1′-bi-2-naphthols was proved to be jointly initiated by MnO 2 catalysis and O 2 -oxidation, not by MnO 2 photocatalysis. β -MnO 2 has the optimal catalytic activity for the oxidative-coupling of 2-naphthols relative to α -MnO 2 , γ -MnO 2 and δ -MnO 2 .
研究领域:
催化化学
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有机合成
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材料化学
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物理化学
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纳米催化
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Qingxiang Zhou,Man Lei,Jing Li,Kuifu Zhao,Yongli Liu
Magnetic Fe@MgAl-layered double hydroxides (MgAl-LDHs) composite was firstly synthesized by coating MgAl-layered double hydroxides on the surface of the dispersed nanoscale zero valent irons with co-precipitation method and characterized by transmission electron microscopy and X-ray diffraction techniques. The synthesized Fe@MgAl-LDHs nanoparticles were investigated for magnetic solid phase extraction (MSPE) of 1-naphthol and 2-naphthol from the water samples. The elutent containing 1-naphthol and 2-naphthol was analyzed by high performance liquid chromatography with variable wavelength detection (HPLC–UV). Under optimal conditions, there is good linear relationship between the concentration and the peak area in the range of 0.5–200 μg L −1 with the correlation coefficients ( r 2 ) above 0.998 for 1-naphthol and 2-naphthol. The limits of detection were 0.22 μg L −1 and 0.19 μg L −1 for 1-naphthol and 2-naphthol, respectively, and precisions were both below 2.5% ( n = 6). The real water analysis demonstrated that the spiked recoveries were in the range of 79.2–80.9% ( n = 3). All these results indicated that the developed MSPE–HPLC–UV method was proved to be an efficient tool for the analysis of naphthols.
研究领域:
环境科学
·
分析化学
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DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Kai Wu,Wenlong Wang,Shubing Yang,Xu Zhang,Peizeng Yang,Yuefei Ji,Jing Chen,Junhe Lu
As global warming intensifies freeze-thaw cycles, the understanding of environmental chemistry processes in ice and their potential impact on global water quality becomes increasingly important. This study investigated the transformation of 1-naphthol in the presence of nitrite (NO 2 - ) under slightly acidic conditions in ice, focusing on the formation of nitro-naphthol. Results demonstrated that increasing NO 2 - concentration enhanced the conversion of 1-naphthol and the formation of nitrated products. This transformation of 1-naphthol was attributed to the freeze-concentration effect, which led to the accumulation of H + , NO 2 - , and 1-naphthol in the liquid-like grain boundary layer amid ice crystals. In this brine, NO 2 - underwent protonation to form reactive nitrous acid (HNO 2 ) and nitrosonium ions (NO + ), which facilitated the nitration, nitrosation, and oxidative coupling reactions, respectively. The pH was shown to influence nitro products formation by altering the HNO 2 to NO + ratio. Toxicity assessment revealed increased toxicity of the NO 2 - /1-naphthol solution after freezing treatment, likely due to the formation of nitrated products, whereas natural organic matter (NOM) reduced this toxicity by suppressing the generation of nitrated products. The findings of this study advance the understanding of NO 2 - chemistry and the behavior of hydroxylated polycyclic aromatic hydrocarbons in cold environments.
研究领域:
环境化学
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物理化学
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化学毒理学
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大气化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Brian Musikavanhu,Dongwei Zhu,Mengran Tang,Zhaoli Xue,Shengjun Wang,Long Zhao
Naphthol hydrazone derivatives are recognized as efficient chelating agents for both qualitative and quantitative detection of metal ions. Here we design a naphthol hydrazine-based chemosensor with covalently linking a strong electron-withdrawing benzothiadiazole group to modulate the molecular electronic structure, nominated as NtHzBtd . The fluorescent probe performs excellent selectivity and sensitivity towards Fe 3+ with 1:1 binding stoichiometry, while exhibiting a quick response at 55 s with a relatively low limit of detection of 0.036 µM. A series of spectroscopic measurements in tandem with theoretical calculations suggest that the probe undergoes both intramolecular charge transfer (ICT) and chelation enhanced quenching (CHEQ) processes. Successful color rendering of paper strips and bioimaging in PC3 cells demonstrate the promising applicability of NtHzBtd for portable Fe 3+ detection in real samples and biosystems.
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
Symmetry-Basel
·
2023
·Vol. 15
·期 3
·629
·
IF 2.7
Fuchong Li,Wei Liu,Li Tian,Wei Cao,Xu Li,Junhong Guo,Jinfeng Cui,Baoping Yang
Because of easy functionalization, low cost, and large-scale fabrication, pure organic fluorescent polymers are widely applied in light-emitting display, bio-fluorescence-enhanced imaging, explosive detection, and other fields. Among these applications, due to their unique optical rotation characteristics, chiral fluorescent polymer materials are part of fluorescent polymers which could be used in chiral molecular detection and separation, biological target detection, etc. In this work, we designed and synthesized the first chiral organic fluorescent polysulfate materials through sulfur fluoride exchange polymerization (new click chemistry) by asymmetric binaphthol molecular. The chiral fluorescent polysulfate were synthesized by R/S [1,1′-binaphthalene]-2,2′-diol(Binol.), propane-2,2-diylbis(4,1-phenylene) bis(sulfurofluoridate) (FO2S–BA–SO2F) and 4,4′-(propane-2,2-diyl)diphenol(BA.) through step-by-step polymerization reaction under alkali present. It was found that the local crystallization of pure bisphenol A polysulfate was broken by the asymmetric axial chiral BINOL molecule inserted in it and let the polymer into the amorphous state. Fluorescent chiral molecules are uniformly dispersed in the polymer; the 120 µm film prepared by the film scraper was transparent and had good luminescence characteristics under ultraviolet light. After fluorescence detection, the excitation wavelength is 450 nm, and the emission wavelength is 480 and 517 nm.Keywords:polysulfate material;fluorescence;polymer;chiral binaphthol
研究领域:
有机化学
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材料科学
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DOI
高影响因子
Metals
·
2024
·Vol. 14
·期 1
·87
·
IF 2.6
Yuantao Yang,Junli Wang,Xuanbing Wang,Jinlong Wei,Xiaoning Tong,Ruidong Xu,Linjing Yang
The electrolytic refining of crude tin is generally carried out in the fluorosilicic acid (H2SiF6) system with the assistance of bone glue and β-naphthol. However, the high saturated vapor pressure and low stability of H2SiF6present environmental concerns and do not align with sustainable development goals. In this paper, the electrochemical behavior of tin on a glassy carbon (GC) electrode was studied in a relatively green and environmentally friendly methanesulfonic acid (MSA) system. Bone glue, sodium lignosulfonate, and β-naphthol were used as additives to make the deposit morphology smooth and to ensure grain refinement. The electrochemical reduction process of Sn2+in an MSA system is a quasi-reversible process controlled by diffusion. The apparent activation energyEa= 14.189 kJ/mol for the ion diffusion of Sn2+was further calculated. The results of chronoamperometry showed that the electrocrystallization of Sn2+on the GC electrode gradually tended to three-dimensional instantaneous nucleation with the increase in applied potential. The morphology and phase of the deposits were analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that the deposits were uniform and dense pure tin. This work elucidates the electrochemical behavior of tin in a methanesulfonic acid system.
研究领域:
电化学
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材料科学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Brian Musikavanhu,Zeping Huang,Quanhong Ma,Yongdi Liang,Zhaoli Xue,Lei Feng,Long Zhao
A pyridine modified naphthol hydrazone Schiff base chemosensor, NaPy , was prepared in a two-step process to detect aluminum ion (Al 3+ ) in different samples. The probe shows a turn-off emission response towards Al 3+ at a 1:1 binding stoichiometry via intramolecular charge transfer (ICT) mechanism, as validated by density functional theory (DFT) calculations and a series of spectroscopic measurements. The response time is slightly over one minute with a limit of detection (LOD) value of 0.164 µM, demonstrating the great sensitivity of the probe. It is also found that NaPy exhibits high selectivity towards Al 3+ and resists interference from seventeen other cations. Application investigations in paper strips, water samples and HeLa cells suggest that NaPy can be used as an efficient probe for sensing Al 3+ in real environmental samples and biosystems.
研究领域:
分析化学
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环境科学
·
生物医学
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产品关联
DOI
PubMed
高影响因子
Chemical Engineering Journal Advances
·
2022
·
IF 0
Hiu Lam So,Wei Chu
Degradation of 1-Naphthol by combined photocatalysis and adsorption in column reactor was studied, and the performance could be predicted by employing a proposed multiple regression model. The model includes four variables: concentration of 1-Naphthol, concentration of peroxymonosulfate (PMS), FeOOH dosage and pH, along with their second-order effects and interactions. Statistical analyses were performed to verify the statistical significance of the regressors, and extra experimental sets were conducted to validate the proposed model. The mathematical model proposed exhibited good reproducibility with no significant statistical difference between the experimental and predicted values. Response surface methodology was used to explore the relationship between the four variables and the response. The process optimal ranges can be further refined at pH 2–2.5; [PMS] = 1.2–1.4 mM; and FeOOH 2.75–3 g respectively, according to the proposed overlaid contour plots.
研究领域:
环境科学
·
化学工程
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DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Youcai Chen,Shao-Lu Li,Dandan Cheng,Jiaqi Li,Mengfan Wang,Qiyu Duan,Genghao Gong,Yunxia Hu
High-performance nanofiltration (NF) membranes prepared by interfacial polymerization (IP) are ideal choice for solving water scarcity. In this study, 7,7′-dihydroxy-2,2′-binaphthol (7,7′–OH-BINOL) with rigidly-contorted structure was used as a co-monomer with piperazine (PIP), leading to NF membranes with lower selective layer thickness and enhanced microporosity, thus facilitated the water molecules transportation. The incorporation of 7,7′–OH-BINOL could regulate the interface diffusion rate of PIP and afforded the polyesteramide selective layer with a special bowl-shaped crater surface morphology. The PIP/BINOL-TMC nanofiltration membrane with the optimal phenol/amine ratio presented water permeability of up to 17.01 L m -2 h −1 bar −1 , which was more than two times that of the pristine NF membrane (i.e. PIP-TMC). Meanwhile, it displayed comparable Na 2 SO 4 rejection (∼98%) and excellent mono-/divalent salt selectivity ( S NaCl/Na2SO4 = 44). In addition, long-term operation and pressure resistance test results demonstrated that the tailored membrane had good operational stability. In conclusion, this work provides a feasible way to overcome the perm-selectivity trade-off effect of NF membrane and potentially could be used to solve the water scarcity problem.
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Yidong Zhou,Zhijian Ke,Hangting Ye,Mengting Hong,Yifei Xu,Mingliang Zhang,Wankui Jiang,Qing Hong
Carbaryl is a widely used carbamate pesticide in agriculture. The strain Rhizobium sp. X9 possesses the typical carbaryl degradation pathway in which carbaryl is mineralized via 1-naphthol, salicylate, and gentisate. In this study, we cloned a carbaryl hydrolase gene cehA and a novel two-component 1-naphthol hydroxylase gene cehC1C2. CehA mediates carbaryl hydrolysis to 1-naphthol and CehC1, an FMNH2 or FADH2-dependent monooxygenase belonging to the HpaB superfamily, and hydroxylates 1-naphthol in the presence of reduced nicotinamide-adenine dinucleotide (FMN)/flavin adenine dinucleotide (FAD), and the reductase CehC2. CehC1 has the highest amino acid similarity (58%) with the oxygenase component of a two-component 4-nitrophenol 2-monooxygenase, while CehC2 has the highest amino acid similarity (46%) with its reductase component. CehC1C2 could utilize both FAD and FMN as the cofactor during the hydroxylation, although higher catalytic activity was observed with FAD as the cofactor. The optimal molar ratio of CehC1 to CehC2 was 2:1. The Km and Kcat/Km values of CehC1 for 1-naphthol were 74.71 ± 16.07 μM and (8.29 ± 2.44) × 10–4 s–1·μM–1, respectively. Moreover, the enzyme activities and substrate spectrum between CehC1C2 and previously reported 1-naphthol hydroxylase McbC were compared. The results suggested that McbC had a higher 1-naphthol hydroxylation activity, while CehC1C2 had a broader substrate spectrum.
研究领域:
环境微生物学
·
生物化学
·
农药生物降解
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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）