INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yong-Sheng Xu,Rui-Xiong Zhao,Kang-Kang Pei,Guo-Liang Zhang,Qing Xia,Feng-Bao Zhang
An optimal design of the neutralization process in 1,5-dihydroxynaphthalene production was proposed and discussed. In the new strategy, instead of sodium chloride, sodium sulfate was used in the salting-out process to overcome the drawbacks of the traditional strategy. Then the precipitated mixtures, mainly naphthalene-1,5-disulfonic acid (1,5-H2NDS) and sodium sulfate, were neutralized to obtain naphthalene-1,5-disulfonic acid disodium (1,5-Na2NDS) and sulfuric acid. By adjusting the concentrations of sulfuric acid solutions to 0.3 and 0.5 mass fractions, 1,5-Na2NDS and 1,5-H2NDS were precipitated out, respectively. The yields of both 1,5-H2NDS and 1,5-Na2NDS reached 0.98. 1,5-Na2NDS was sent to the alkali fusion process, while 1,5-H2NDS was reused in the neutralization. In neutralization, the mole ratio (1,5-H2NDS to sodium sulfate) was chosen as 2.5 and the reaction temperature was 353 K. In order to determine the separation conditions, the solubilities of 1,5-H2NDS·2H2O and 1,5-Na2NDS·H2O in aqueous sulfuric acid solutions were measured over the temperature range from 277 to 337 K at atmospheric pressure by a dynamic method. The new strategy is particularly instructive for the industrial production of 1,5-dihydroxynaphthalene.
研究领域:
化学工程
·
工业化学
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Waqar Uddin
A new analytical approach for the kinetic determination of 2,7-dihydroxynapthalene (2,7-DHN) by perturbation effect with its narrow concentration range on Belousov-Zhabotinsky (BZ) oscillator catalyzed by tetra-aza-macrocyclic copper complex catalyst ([CuL](ClO 4 ) 2 was reported in this paper. The Ligand “L” in this complex is 5,7,7,12,14,14-hexemethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. Perturbation experiments were performed after optimizing the oscillation parameters which indicates that the change in the oscillation amplitude (ΔA) is directly proportional to the concentration of 2,7-DHN added in the range of 4.50 × 10 -4 mol L -1 to 1.80 × 10 -3 mol L -1 with the correlation coefficient of 0.98. The calculated relative standard deviation (RSD) from the 6 measurements obtained by the injection of 5.00 × 10 -3 mol L -1 is 1.90 %. The lower limit of detection (LOD) is 2.10 × 10 -4 mol L -1 . Factors that influence the oscillation system were studied. A reaction perturbation mechanism was proposed based on a novel FKN model.
研究领域:
分析化学
·
电化学
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产品关联
DOI
PubMed
高影响因子
JACS Au
·
2025
·
IF 8.7
Xingzhong Chen,Fang Yan,Jiurong Li,Xiao Gong
Carbonized polymer dots (CDs) with sizes smaller than 10 nm have gained significant interest, particularly in the pursuit of multicolor fluorescence, which is a fascinating field of research. Here, we report the control synthesis of multicolor CDs with tunable emissions via the rational selection of isomer-based reaction precursors. Using cost-friendly dihydroxynaphthalene (DHN) isomers (1,7-DHN, 1,6-DHN, or 2,7-DHN) and l-methionine as the precursors, multicolor CDs with blue, green, and red fluorescence were obtained under ethanol-thermal conditions. It can be observed that structural changes in the coordination of the hydroxyl group within the aromatic compound DHN lead to a significant redshift in the emission of the synthesized CDs. Notably, the red-emitting CDs (r-CDs, 10 μM) at very low concentrations exhibit high sensitivity to tetracycline (TC), and the ratiometric fluorescent probe based on r-CDs enables quantitative and visual detection of TC. Compared with ratiometric fluorescent probes containing metal and rare earth elements, CDs-based ratiometric fluorescent probes are more cost-effective and environmentally friendly.
研究领域:
材料科学
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化学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 12
·1-11
·
IF 2.278
Wang Yun,Wang Feihu,Guo Yuan,Chen Rongjun,Shen Yuanyuan,Guo Aijie,Liu Jieying,Zhang Xiao,Zhou Dejian,Guo Shengrong
This paper reports the synthesis of monodisperse gold nanorods (GNRs) via a simple seeded growth approach in the presence of different aromatic additives, such as 7-bromo-3-hydroxy-2-naphthoic acid (7-BrHNA), 3-hydroxy-2-naphthoic acid (HNA), 5-bromosalicylic acid (5-BrSA), salicylic acid (SA), or phenol (PhOH). Effects of the aromatic additives and hydrochloric acid (HCl) on the structure and optical properties of the synthesized GNRs were investigated. The longitudinal surface plasmon resonance (LSPR) peak wavelength of the resulting GNRs was found to be dependent on the aromatic additive in the following sequence: 5-BrSA (778 nm) > 7-BrHNA (706 nm) > SA (688 nm) > HNA (676 nm) > PhOH (638 nm) without the addition of HCl, but this was changed to 7-BrHNA (920 nm) > SA (890 nm) > HNA (872 nm) > PhOH (858 nm) > 5-BrSA (816 nm) or 7-BrHNA (1,005 nm) > PhOH (995 nm) > SA (990 nm) > HNA (980 nm) > 5-BrSA (815 nm) with the addition of HCl or HNO 3 , respectively. The LSPR peak wavelength was increased with the increasing concentration of 7-BrHNA without HCl addition; however, there was a maximum LSPR peak wavelength when HCl was added. Interestingly, the LSPR peak wavelength was also increased with the amount of HCl added. The results presented here thus established a simple approach to synthesize monodisperse GNRs of different LSPR wavelengths.
研究领域:
纳米材料科学
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化学合成
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Zhen-Zong Bao,Si-Qi Lu,Guangzhao Wang,Zongwei Cai,Zhi-Feng Chen
The interaction of microplastics (MPs) and organic pollutants has recently become a focus of investigation. To understand how microplastic residues affect the migration of organic pollutants, it is necessary to examine the adsorption and desorption behavior of organic pollutants on MPs. In this study, integrated adsorption/desorption experiments and theoretical calculations were used to clarify the adsorption mechanism of 2-hydroxynaphthalene (2-OHN), naphthalene (NAP), phenanthrene (PHE), and pyrene (PYR) by polyvinyl chloride microplastics (PVC-MPs). Based on the phenomenological mathematical models, the rate-limiting step for analyte adsorption onto PVC-MPs was adsorption onto active sites (R 2 = 0.865–0.995). Except for PHE, analyte adsorption isotherms were well described by the Freundlich model (R 2 = 0.992–0.998), and adsorption thermodynamics showed that analyte adsorption on PVC-MPs was a spontaneous exothermic process (Δ H 0 < 0; Δ G 0 < 0). Based on the order of adsorption efficiency of 2-OHN < NAP < PHE < PYR, which is identical to the competitive adsorption experiment, polycyclic aromatic hydrocarbon (PAH) adsorption on PVC-MPs increased as the aromatic ring number increased and the hydroxyl content decreased. The release of 2-OHN (49 %–52 %) from PVC-MPs into the simulated gastrointestinal environment was greater than that of NAP (5.5 %–5.7 %). Theoretical calculations and adsorption tests indicated that hydrophobic interaction was the primary influence on the adsorption of PAHs and their hydroxylated derivatives by PVC-MPs. These findings improve our understanding of MPs' behavior and dangers as pollutant carriers in the aquatic environment and help us develop recommendations for the pollution control of MPs.
研究领域:
环境科学
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生物学
·
毒理学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2020
·
IF 3.306
Yuanming Li,Yaxiong Wei,Xiaoguo Zhou
Two new metal-free photosensitizers of Bodipy-carbazole derivatives, Phenyl-Bodipy-Carbazole (BC) and Carbazole-Bodipy-Carbazole (CBC), were synthesized. The transient absorption spectroscopy and the density functional theory calculations verify that the triplet Bodipy unit is produced in the dyads via an intramolecular charge transfer in the Franck-Condon excitation. Moreover, an apparent dependence on the solvent polarity was observed for these triplet states lifetimes, e.g. 9.6 and 118.2 μs in cyclohexane , while, 204.7 and 464.7 μs in dichloroethane for BC and CBC, respectively, as well as the triplet state quantum yields. With the increase of solvent polarity, the prolonged lifetime and the decreased quantum yield of the triplet BC and CBC convince us the charge-transfer mechanism for ISC process. In addition, the photo-oxidation rate constants of 1,5-dihydroxynaphthalene with these triplet photosensitizers are determined to be 1.11 × 10 −3 min -1 and 2.54 × 10 −3 min -1 for BC and CBC, respectively.
研究领域:
有机化学
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光化学
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材料科学
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DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 5
·1052
·
IF 4.2
Weiwei Wang,Zhengyao Li,Weiyao Zhu,Shaochun Hou,Chunlei Guo
The atomic-level structure and electronic properties of monazite were investigated using a first-principles method based on density functional theory (DFT). First, the geometric structure of monazite was optimized, followed by calculations of its Mulliken population, electron density, and density of states, which were subsequently analyzed. The findings of this analysis suggest that monazite is highly susceptible to cleavage along the {100} plane during crushing and grinding. When SPA was utilized as the collector, the recovery rate of monazite was higher than that when LF-P8 was used. The zeta potential and adsorption energy results indicated that the zeta potential after SPA adsorption tended towards negativity, and the adsorption energy was smaller, indicating that SPA exhibited stronger adsorption performance. LF-P8 was stably adsorbed on the monazite (100) surface via mononuclear double coordination. SPA was stably adsorbed on the surface of monazite (100) via binuclear double coordination. The results of this study provide valuable insights into the adsorption of monazite by commonly used flotation collectors. These findings are of substantial importance for future endeavors in designing flotation collectors capable of achieving selective monazite flotation.
研究领域:
矿物加工工程
·
理论化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Wangning Zhang,Waqar Uddin,Gang Hu,Lin Hu,Zhaohui Fang
A novel method for identification of four isomers of dihydroxynaphthalene (DHN) was reported by their different perturbation effects on a Briggs-Rauscher (BR) oscillating system. In the system, macrocyclic nickel (II) complex NiL(ClO 4 ) 2 is used as the catalyst, where the ligand L in the complex is 5,7,7,12,14,14‑hexemethyl‑1,4,8,11‑tetraazacyclotetradeca‑4,11‑diene. By putting equal amount of the same concentrations of four isomers (1,4‑dihydroxynaphthalene (1,4-DHN), 1,5‑dihydroxynaphthalene (1,5-DHN), 2,3‑dihydroxynaphthalene (2,3-DHN) and 2,7‑dihydroxynaphthalene (2,7-DHN)) into BR system, the system could or couldn't be perturbed, being reflected in quite different oscillating behaviors after addition of isomers. These four isomers were identified in their concentration range of 5.0 × 10 −6 to 2.5 × 10 −4 mol/L. An explanation of such perturbation mechanism is that, 1,4-DHN couldn't be oxidized by BR matrix, but 1,5-DHN, 2,3-DHN and 2,7-DHN could be oxidized by HOO to yield 5‑Hydrox‑1,4‑naphthoquinone, phthalic acid and 6,7‑dihydroxyperylene‑1,12‑quinone (DHPQ), respectively.
研究领域:
分析化学
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物理化学
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化学生物学
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反应动力学
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分子识别
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DOI
高影响因子
DYES AND PIGMENTS
·
2022
·
IF 5.122
Mengyao Zhang,Li Gao,Xinyi Zhao,Yuai Duan,Yi Liao,Tianyu Han
We herein present a donor-acceptor (D-A) luminogen, ( E )-(3- (((2-hydroxynaphthalen-1-yl)methylene)amino)phenyl)(phenyl)methanone ( HNPMO ), with both intramolecular charge transfer and aggregation-induced emission (ICT + AIE) properties. It was developed into a film sensor by drop-casting, exhibiting sharp increase in emission when exposing to various volatile organic compounds (VOCs), such as benzene series ( e.g. , toluene), common organic solvents ( e.g. , ethyl acetate) and alcohols ( e.g. , methanol), etc . Spectral analysis and quantum chemical calculations confirmed that the turn-on response can be ascribed to the transition from the disordered molecular arrangement to the optimized conformation driven by VOCs in the gas phase, with some major influence factors including volatility, molecular size, structural compatibility and steric hindrance . In addition, the fluorescent response is quantified by well-established image technology, using RGB and Lab color space. In the sensitivity test, Lab color shift (Δ E Lab ) was used to estimate the limit of detection (LOD) of the HNPMO film sensor, which gives a linear relation with VOC concentration. The resulting LOD value is as low as 7.04 mg/m 3 (1.8 ppm), suggesting high sensitivity intrinsic to such turn-on type sensor. We further fabricate a wearable sensor device based on HNPMO film, employing a reference substance which is inert to VOCs. Thus the presence of VOCs can be confirmed by the Lab color shift between HNPMO and the inert reference. By cutting and shaping, the film sensor applies to gloves, labor suits and even nails. It is capable of point-of-care detection of VOCs, providing an early warning of air contamination in various scenarios.
研究领域:
化学
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材料科学
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环境科学
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DOI
高影响因子
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
·
2021
·Vol. 37
·期 12
·1-9
·
IF 3.312
Wu Chuan,Zeng Yuanyuan,He Yang
Staphylococcus aureus is a common clinical bacterial pathogen that can cause a diverse range of infections . The establishment of a rapid and reliable assay for the early diagnosis and detection of S. aureus is of great significance. In this study, we developed a closed-tube loop-mediated isothermal amplification (LAMP) assay for the visual detection of S. aureus using the colorimetric indicator hydroxy naphthol blue (HNB). The LAMP reaction was optimized by adjusting the amplification temperature, the concentrations of Mg 2+ , dNTP, and HNB, and the incubation time. In the optimized reaction system, the specificity of LAMP for S. aureus was 100%. The results established that this method accurately identified S. aureus , with no cross-reactivity with 14 non- S. aureus strains. The limit of detection (LOD) of LAMP was 8 copies/reaction of purified plasmid DNA or 400 colony-forming units/reaction of S. aureus . Compared with conventional PCR, LAMP lowered the LOD by tenfold. Finally, 220 clinically isolated strains of S. aureus and 149 non- S. aureus strains were used to evaluate the diagnostic efficacy of LAMP (test accuracy, 99.46%). The findings indicated that LAMP is a reliable test for S. aureus and could be a promising tool for the rapid diagnosis of S. aureus infections.
研究领域:
微生物学
·
分子生物学
·
临床诊断
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DOI
PubMed
高影响因子
ANALYST
·
2018
·Vol. 143
·期 20
·5054-5060
·
IF 3.864
Bo Lin,Li Fan,Jinyin Ge,Wenjia Zhang,Caihong Zhang,Chuan Dong,Shaomin Shuang
A mitochondrial-targeted pH fluorescent probe 4-(2-(6-hydroxynaphthalen-2-yl)vinyl)-1-methylpyridin-1-ium was facilely synthesized via the carbon–carbon double bond bridging of 6-hydroxy-2-naphthaldehyde and 1,4-dimethylpyridinium iodide salt. The probe exhibited remarkable pH-dependent behavior in the linear range of 7.60–10.00, with a pKa value of 8.85 ± 0.04 near mitochondrial pH. A significantly large Stokes shift of 196 nm was obtained, which reduces the interference of excitation light. Application of the probe in live HepG2 cells indicated that the probe had excellent mitochondrial targeting ability and was successfully used to visualize mitochondrial pH fluctuations in live cells.
研究领域:
化学
·
生物化学
·
细胞生物学
·
荧光成像
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Wenjuan Wu,Congcong Yin,Aiqin Yue,Jingping Niu,Weijun Du,Dingbin Liu,Jinzhong Zhao
Soybean mosaic virus (SMV) is the most prevalent viral pathogen of soybean worldwide that reduces seed quality and causes serious losses in yields. The accurate, rapid and early detection of SMV strains is crucial for screening SMV-resistant soybean varieties and controlling soybean mosaic disease timely. In this study, we report a loop-mediated isothermal amplification (LAMP) assay for visual and rapid detection of SMV-SC7, the major prevalent SMV strain in China, in soybean leaves. Specific primers were rationally designed and tested to detect the SMV-SC7 strain. The detection limit for SMV-SC7 can be as low as 10 −4 ng/μL by the developed LAMP assay. These results were visualized by three indicators (SYBR green I, neutral red and hydroxy naphthol blue) with high fidelity. The high analytical performance of the LAMP assay was demonstrated with 21 soybean cultivars, among which 8 soybean cultivars were further inoculated with consistent results to those achieved by LAMP. This visual and rapid LAMP assay is highly promising for early detection of SMV-SC7-associated plant diseases.
研究领域:
植物病理学
·
分子生物学
·
农学
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DOI
高影响因子
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