JOURNAL OF CHROMATOGRAPHY A
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2020
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IF 4.049
Xiaohai Wu,Siyu Si,Wei Tan,Xin Lu,Fanggui Ye,Shulin Zhao
To address the undesirably low porosity of phenolic resin, a new material termed magnetic mesoporous metal-phenolic coordination spheres (Fe 3 O 4 @Co-TA) was synthesized by chelating tannic acid (TA) with metal ions. Fe 3 O 4 @Co-TA was characterized by transmission electron microscopy, scanning electron microscopy, hysteresis loop (B-H) analysis, Fourier-transform infrared spectroscopy, and N 2 adsorption-desorption. The results indicated that the new material comprises mesopores (2 nm and 3 nm) and exhibits a good magnetic response (44 emu/g). Combined with high-performance liquid chromatography (HPLC), a novel method for the detection of crystal violet (CV) and leucocrystal violet (LCV) by magnetic solid-phase extraction was established. Under the optimal extraction conditions, the linear ranges of CV and LCV detection were 0.2‒60 μg/L and 0.04‒40 μg/L, the detection limits were 0.04 μg/L and 0.008 μg/L, and the enrichment factors were 435 and 460, respectively. Fe 3 O 4 @Co-TA was reused ten times without significant reduction of the extraction ability. This method was successfully used for the detection of CV and LCV in fish samples, providing an effective technique for food safety monitoring and quality control.
研究领域:
食品安全
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分析化学
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材料科学
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DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Congcong Hu,Can Liu,Xu Zhang,Wei Tong,Yu Yin,Jinquan Liu,Shengyuan Yang
Crystal violet (CV), widely used as a fungicide in aquaculture, is susceptible to enrichment in fish and thus poses a threat to human health. Therefore, there is an urgent need for a simple, sensitive and cost-effective method to detect CV. To this need, duck egg white-stabilized gold-silver nanoclusters (DEW-AuAgNCs) with long wavelength fluorescence emission were synthesized via microwave method in 1 min. The raw materials used were easily available and environmentally friendly. And based on the Fluorescence resonance energy transfer (FRET) between DEW-AuAgNCs and CV, a fluorescence quenching method was established for CV detection. The detection limit of this method was 1.7 × 10 −8 mol/L, which was lower than most of the reported methods. In addition, prominent performance of DEW-AuAgNCs with long wavelength emission can be applied for the detection of CVs in real organism.
研究领域:
分析化学
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纳米技术
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环境科学
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生物技术
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产品关联
DOI
高影响因子
NANO
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2018
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IF 1.1
Yongmei Xia,Zuming He,Jiangbin Su,Ya Liu,Bin Tang,Xiaoping Li
Novel n-SrTiO 3 /p-BiOI heterojunction composites were successfully fabricated by loading SrTiO 3 particles onto the surface of BiOI nanoflakes via a two-step method. The as-prepared samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscopy (FE-SEM), energy-disperse X-ray spectroscopy (EDS), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), diffuse reflectance spectroscopy (DRS) and electrochemical measurements. The results show that the n-SrTiO 3 /p-BiOI heterojunction composites are composed of perovskite structure SrTiO 3 and tetragonal phase BiOI. The composites exhibit excellent photocatalytic performance for the degradation of crystal violet (CV) solution under simulated solar light irradiation, which is superior to that of pristine BiOI and SrTiO 3 . The 30 wt.%SrTiO 3 /BiOI composite is found to be the optimal composite, over which the dye degradation reaches 92.5% for 30 min of photocatalysis. The photocatalytic activity of the 30 wt.%SrTiO 3 /BiOI composite is found to be 3.94 times and 28.2 times higher than that of bare BiOI and SrTiO 3 , respectively. The reactive species trapping experiments suggest that • O 2 − and holes are the main active species responsible for the CV degradation. In addition, the electrochemical measurements elucidate the effective separation of photoinduced electron–hole pairs. Moreover, on the basis of experimental and theoretical results, a possible mechanism for the enhanced photocatalytic performance of the SrTiO 3 /BiOI heterojunction composites is also proposed.
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
Nanomaterials
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2019
·Vol. 9
·期 11
·1556
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IF 4.034
Dan Zhao,Xuemei Liu,Zhixia Zhang,Rui Zhang,Liangxiu Liao,Xincai Xiao,Han Cheng
The adjustment of the emitting wavelength of carbon dots (CDs) is usually realized by changing the raw materials, reaction temperature, or time. This paper reported the effective synthesis of multicolor photoluminescent CDs only by changing the solvent in a one-step solvothermal method, with 1,2,4,5-tetraaminobenzene as both the novel carbon source and nitrogen source. The emission wavelengths of the as-prepared CDs ranged from 527 to 605 nm, with quantum yields (QYs) reaching 10.0% to 47.6%, and it was successfully employed as fluorescence ink. The prepared red-emitting CDs (R-CDs, λem= 605 nm) and yellow-emitting CDs (Y-CDs, λem= 543 nm) were compared through multiple characterization methods, and their luminescence mechanism was studied. It was discovered that the large particle size, the existence of graphite Ns, and oxygen-containing functional groups are beneficial to the formation of long wavelength-emitting CDs. Y-CDs responded to crystal violet, and its fluorescence could be quenched. This phenomenon was thus employed to develop a detection method for crystal violet with a linear range from 0.1 to 11 µM and a detection limit of 20 nM.Keywords:carbon dots;multicolor luminescence;solvent control;surface state;crystal violet sensing
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
JOURNAL OF MOLECULAR LIQUIDS
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2017
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IF 3.648
Lvjie Yang,Yunhui Xiang,Lin Chen,Dan Zhang,Chenyi Wu,Shenghui Zhang,Jinshou Wang,Dating Tian
The pseudoternary phase diagrams of surfynol465/ n -butanol/ n -hexane/0.006 mol/L NaOH aqueous solution with k m = 5/3 and surfynol465/ n -butanol/ n -hexane/0.006 mol/L NaOH-heavy water solution with k m = 5/3 (where k m is mass ratio of surfynol465 to n -butanol) have been constructed. In the corresponding O/W regions of these two microemulsion systems, the kinetics of the basic hydrolysis of crystal violet has been investigated near and far away from their respective critical points by using UV spectrophotometer . It was found that no critical effects were observed in these two systems. For the first reaction system, the experimental results obeyed the Griffiths-Wheeler rule; however, it was not consistent with the prediction by the Griffiths-Wheeler rule for the second reaction system. This discrepancy of theory and experiment for the second reaction system may be related to the isotope exchange of H and D. This work extended the studies of critical effect on the chemical reaction to O/W microemulsion as reaction medium.
研究领域:
物理化学
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胶体与界面化学
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DOI
高影响因子
Journal of Ocean University of China
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2014
·Vol. 13
·期 2
·236-242
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IF 0.381
Lian Ziru,Wang Jiangtao
Molecularly imprinted polymers (MIPs) were prepared by the bulk polymerization using crystal violet as the template molecule, and the methacrylic acid and ethylene glycol dimetheacrylate as functional monomer and cross-linker, respectively. Systematic investigations of synthetic conditions were conducted. The surface morphology and recognition mechanism of the obtained polymers were studied using scanning electron microscope and spectrophotometric analysis. MIPs showed high affinity to template molecule and were successfully applied as special solid-phase extraction sorbent for selective extraction of crystal violet from natural seawater. An off-line molecularly imprinted solid-phase extraction (MISPE) method followed by high-performance liquid chromatography with diodearray detection for the analysis of crystal violet was also established. MISPE columns have good recoveries for crystal violet standard solutions and good linearity was obtained over the concentration range of 0–200 μg L −1 ( R
2 > 0.99). Finally, two natural seawater samples were investigated. The recoveries of spiked seawater on the MISPE columns were from 44.47% to 62.34%, the relative standard deviation ( n =3) being in the range of 2.89%–5.96%.
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
ENVIRONMENTAL POLLUTION
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2024
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IF 7.6
Xinyu Liu,Jianlong Wang
Ionizing radiation (mainly including gamma ray and electron beam) technology provides a more efficient and ecological option for dye-containing wastewater treatment, which is supported by its successful achievements in industrial-scale applications. However, the degradation pathway of triphenylmethane dyes by radiation technology is still unclear. In this study, crystal violet (CV) was selected as representative cationic triphenylmethane dye, the decolorization and degradation performance by electron beam radiation technology was systematically evaluated. The results showed that CV can be efficiently decolorized and mineralized by radiation, and its degradation kinetics followed the first-order kinetic model. The effect of inorganic anions and chelating agents commonly existed in dye-containing wastewater on CV decolorization and total organic carbon (TOC) removal was explored. Quenching experiments, density functional theory (DFT) calculation and high performance liquid chromatography mass spectrometry (HPLC-MS) analysis were employed to reveal CV decolorization and degradation mechanism and pathway, which mainly included N-demethylation, triphenylmethane chromophore cleavage, ring-opening of aromatic products and further oxidation to carboxylic acid, and mineralization to CO 2 and H 2 O. Additionally, electron beam radiation/PMS process was explored to decrease the absorbed dose required for decolorization and degradation, and the synergetic effect of radiation with PMS was elucidated. More importantly, the findings of this study would provide the support for treating actual dyeing wastewater by electron beam radiation technology.
研究领域:
环境科学
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化学工程
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辐射化学
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水处理
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废水管理
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产品关联
DOI
PubMed
高影响因子
Food Bioscience
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2024
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IF 4.8
Ailing Lei,Mingda Li,Siqi Zhuo,Qianjin Li,Jianlin Li
Ochratoxin A (OTA) with high toxicity is widely present in agricultural products, posing an enormous threat to human and animal health. Thus, simple, rapid, sensitive and selective detection of OTA is highly necessary. Herein, we have developed a new label-free fluorescence and naked-eye detection platform for ochratoxin A based on the interaction between OTA-antiparallel G-quadruplex(G4)/crystal violet (CV). CV and OTA aptamer could form a G4 structure with high fluorescence intensity. When OTA was present in the G4/CV mixture, it replaced CV and bound to the OTA aptamer, and then the fluorescence of the mixture remarkedly quenched. The interaction among OTA and G4/CV had been revealed by fluorescence, ultraviolet and circular dichroism (CD) spectra. The detection process could be performed by naked-eye and could be completed within 10 min. The established method showed 0.1–1000 ng/mL linear detection range with 0.07 ng/mL limit of detection (LOD). The recovery rates in cereal samples were in the range of 76–105%. Compared with the classical ELISA, the recovery rates and the detected concentration of OTA in the naturally contaminated cereal samples were consistent. The new method can provide a simple, rapid and cost-effective, label-free and naked-eye detection of OTA with high specificity, good repeatability and high precision.
研究领域:
分析化学
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毒理学
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食品安全
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生物化学
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产品关联
DOI
高影响因子
CHROMATOGRAPHIA
·
2015
·Vol. 78
·期 15
·979-985
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IF 1.411
Li Gongheng,Zhang Xinfeng,Zhang Leilei,Xu Shuxia,Li Chongying
In this study, an efficient sample pretreatment method, salt-assisted graphene oxide dispersive solid phase microextraction (SA-GO-DSPME), was established for extraction of malachite green (MG) and crystal violet (CV). The dispersive graphene oxide was found to be easily aggregated and completely centrifuged in the presence of NaCl. The adsorption kinetic of SA-GO-DSPME was shown to be quite fast (equilibrium time = 5 min). Key parameters that influenced extraction efficiency including sample pH, the eluent type, GO amount, extraction time, NaCl concentration and centrifuging time were investigated. Coupled with SA-GO-DSPME, high-performance liquid chromatography (HPLC) could be used for sensitive detection of MG and CV with detection limits down to 1.7 and 0.3 ng mL −1 for MG and CV, respectively. The relative standard deviations for extraction reproducibility ( n = 5) were 1.8 % for MG and 3.8 % for CV. The proposed method has been successfully applied for detection of MG and CV in real water samples, and the recoveries ranged from 89.7 to 116.4 %. This simple and fast extraction method may provide a promising alternative for extraction of trace amount of MG and CV in complicated samples.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2022
·
IF 5.532
Bo Li,Huan-Yan Xu,Yu-Long Liu,Li-Min Dong,Sridhar Komarneni
Due to the in-situ generation of reactive oxygen species (ROS), sulfate radical-based advanced oxidation processes (SR-AOPs) have emerged for the oxidative degradation of organic contaminants. Developing highly efficient heterogeneous catalysts is of great importance for SR-AOPs. In this work, an urchin-like Co 3 O 4 nanocatalyst with oxygen vacancies (V O ) was elaborately fabricated and employed for enhanced peroxymonosulfate (PMS) activation to degrade the high-concentration active dye crystal violet (CV). The obtained sample was characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and N 2 adsorption/desorption isotherms. Characterization results indicated that this unique V O -rich urchin-like Co 3 O 4 nanocatalyst was endowed with a larger surface area and abundant reactive sites for PMS adsorption and activation. The experimental results of CV degradation showed that nearly complete removal of 100 mg L −1 CV could be realized within 30 min of reaction time under neutral conditions at room temperature, and the degradation process followed retarded-first-order kinetics. Electron paramagnetic resonance (EPR) spectra accompanied by quenching experiments of radicals demonstrated that the contribution of ROS to CV degradation followed this sequence: 1 O 2 > ▪OH > SO 4 ▪- > O 2 ▪- . The degradation pathways of CV were proposed by a combination of density functional theory (DFT) calculations along with frontier orbit theory while the toxicity of intermediate products was evaluated by quantitative structure-activity relationship (QSAR) prediction.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Particuology
·
2021
·
IF 3.067
Tian Tian,Mengling Liu,Yinhui Li,Jian Han,Liang Ren,Heike Lorenz,Qing Wu,Jianxin Chen
Textile wastewater contains highly toxic, nondegradable, carcinogenic organic pollutants, causing severe damage to the ecological environment. In this work, β-cyclodextrin carbon-sphere-based nanocomposite (CS/SiO 2 @β-CD) with a core–shell–shell configuration was prepared by hydrothermal synthesis and subsequent sedimentation-azeotropic distillation with SiO 2 as intermediate layer for the removal of crystal violet (CV) and bisphenol A (BPA). The chemical structure and morphology of the CS/SiO 2 @β-CD were characterized by FT-IR, SEM and TEM. The effects of contact time, pH, temperature and initial concentration of the absorbates on the adsorption property were explored. The CS/SiO 2 @β-CD showed excellent adsorption capacity on CV and BPA, and the maximum adsorption capacity was 87.873 mg g –1 and 165.095 mg g –1 , respectively. Their adsorption process was in line with the pseudo-second-order and pseudo-first-order kinetic models, respectively. The adsorption thermodynamics could be better fitted by Langmuir model than by Freundlich model. The calculated thermodynamic parameters (–Δ G 0 , Δ S 0 and Δ H 0 ) illustrated the adsorption of CV was endothermic, in contrast, the adsorption of BPA was exothermic process. Furthermore, the CS/SiO 2 @β-CD showed excellent recovery performance, making it a potential adsorbent for the practical treatment of textile wastewater.
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DOI
高影响因子
Analytical Methods
·
2024
·Vol. 16
·期 44
·7460-7467
·
IF 2.7
Zhaolu He,Haiyang Xian,Liang Xu,Jianxi Zhu,Mang Lin,Xiaoliang Liang,Hongping He
Accurately quantifying hydrogen peroxide (H2O2) is essential for elucidating its role across diverse environments. Spectrophotometry is widely employed in laboratories for this purpose due to its convenience, cost-effectiveness, and low detection limits for micromolar H2O2 concentrations. However, accurate measurement of H2O2 in iron-containing solutions presents challenges due to the interference of iron ions. In this study, we propose a modified spectrophotometric method for H2O2 determination in iron-containing solutions by adding two types of iron ion chelators and selecting leuco crystal violet (LCV) as a chromogenic reagent due to its stability. By sequentially adding 1,10-phenanthroline and EDTA, and using a phosphate buffer at pH 4.2 to provide the optimal chromogenic pH condition, this modified method effectively mitigates the interference of iron ions in the LCV chromogenic reaction. The applicability of this method under aerobic and anaerobic conditions was confirmed by comparing the experimental results with theoretical simulations. Under optimal chromogenic conditions, this method achieves a detection limit of 300 nM. This improved method allows better detection of H2O2 in iron-containing systems and investigation of its significance in various environmental processes.
研究领域:
分析化学
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环境科学
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化学工程
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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）