JOURNAL OF CHROMATOGRAPHY A
·
2020
·
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
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2021
·
IF 6.789
Wei Liu,Jie Huang,Anthony J. Weatherley,Wenjun Zhai,Fuya Liu,Zhiling Ma,Yunhong Jiao,Chao Zhang,Bing Han
Turning agricultural waste into effective remediation materials is a highly promising approach for reducing in-field crop burning and promoting affordable wastewater treatment . This comparative study aims to identify active adsorption sites for methylene blue (MB), crystal violet (CV), and cadmium (Cd) as model pollutants on wheat straw materials modified by a thermal partial-oxidation process. The optimal modification temperature was found to be 160–180 °C for MB and CV adsorption, which is much lower than that of Cd(II) at 220–240 °C. A strong linear correlation exits between total surface group concentrations and Cd(II) uptake, indicating that both acidic and basic functional groups are favourable adsorption sites of Cd(II). By contrast, basic groups generated at higher modification temperatures might have adverse effects on MB and CV adsorption. These results provided mechanistic insights and predictive approach into reuse of agricultural waste for environmental remediation.
研究领域:
环境科学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Qiufeng Lan,Qingyi Li,Xueyan Zhang,Zhidong Chen
A novel electrochemiluminescence (ECL) system that consists of the copper sulphide (CuS) film and K 2 S 2 O 8 was prepared and used for detecting crystal violet in aqueous solutions. The CuS film was a luminescent semiconductor material, which was modified on glassy carbon electrode (GCE) via one-step electrodeposition . To enhance the ECL intensity, K 2 S 2 O 8 was added into the solution. The morphology and composition of the modified electrodes were analyzed with scanning electron microscope, energy-dispersed spectrum, transmission electron microscope, high resolution transmission electron microscopy , X-ray diffraction and Raman spectroscopy. Electrochemical impedance spectroscopy (EIS) was studied for different electrodeposition time. Under the optimal conditions, the ECL intensity of the quenching value (ΔECL) versus the logarithm of the concentration of crystal violet was linear over a concentration range from 5.0 × 10 − 8 to 1.0 × 10 − 5 mol L − 1 ( r = 0.9926) and the limit of detection (LOD) was up to 3.2 × 10 − 9 mol L − 1 .
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 26
·6081-6090
·
IF 3.431
Sheng Zhen,Chen Ligang
Abstract The concentration of L-cysteine (Cys) and glutathione (GSH) is closely related to the critical risk of various diseases. In our study, a new rapid method for the determination of Cys and GSH in water and urine samples has been developed using a fluorescent probe technique, which was based on crystal violet (CV)-functionalized CdTe quantum dots (QDs). The original QDs emitted fluorescence light, which was turned off upon adding CV. This conjugation of CV and QDs could be attributed to electrostatic interaction between COO − of mercaptopropionic acid (MPA) on the surface of QDs and N + of CV in aqueous solution. In addition, Förster resonance energy transfer (FRET) also occurred between CdTe QDs and CV. After adding Cys or GSH to the solution, Cys or GSH exhibited a stronger binding preference toward Cd 2+ than Cd 2+ -MPA, which disturbed the interaction between MPA and QDs. Thus, most MPA was able to be separated from the surface of QDs because of the participation of Cys or GSH. Then, the fluorescence intensity of the CdTe QDs was enhanced. Good linear relationships were obtained in the range of 0.02–40 μg mL −1 and 0.02–50 μg mL −1 , and the detection limits were calculated as 10.5 ng mL −1 and 8.2 ng mL −1 , for Cys and GSH, respectively. In addition, the concentrations of biological thiols in water and urine samples were determined by the standard addition method using Cys as the standard; the quantitative recoveries were in the range of 97.3–105.8%, and relative standard deviations (RSDs) ranged from 2.5 to 3.7%. The method had several unique properties, such as simplicity, lower cost, high sensitivity, and environmental acceptability.
Crystal violet-functionalized CdTe quantum dots for detecting L-cysteine and glutathione with switch-on fluorescent strategy
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Qingsong Ji,Haichao Li
High surface area carbons materials were prepared by a process of carbonization followed by chemical activation of biomass resources of chitin . The characterization of the carbon material was done using Scanning Electron Microscope (SEM), N 2 adsorption/desorption, Fourier Transform Infrared Spectroscopy (FTIR), Elemental Analyzer and X-ray Photoelectron Spectroscopy (XPS). The absorption of the carbon material was studied as kinetically and thermodynamically for the removal of cationic dye, Crystal Violet (CV) from wastewater. The results showed that KOH-activated samples with high BET surface area (2186.3 m 2 g −1 ) and total pore volume (0.9815 cm 3 /g). In some case, the samples are suitable for CV removal for a large range of pH and the removal efficiency is close to 100%. The adsorption process was found to follow pseudo-second order kinetics and Langmuir models. In addition, between 25 and 45 °C, the monolayer maximum adsorption capacity significantly increased and the maximum adsorption capacity was found to be 331.406, 399.943 and 420.068 mg g −1 at 25 °C, 35 °C and 45 °C, respectively.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Yupeng Sun,Kaihui Zhou,Yuxin Wang,Ye Lin,Weiran Wang,Xue Xiong,Xiangru Zhao,Huinan Cui,Min Liang,Qiao Wang,Shengnan Yang,Li Li
Rapid, low-cost, and in-situ detection of illegal residues on aquatic product surfaces remains a significant challenge. Herein, we developed a versatile surface-enhanced Raman scattering (SERS) sensor by integrating instant interfacial self-assembled silver nanostar film onto flexible polytetrafluoroethylene filter membrane (AgNS/PTFE) for sensitive detection of malachite green (MG) and crystal violet (CV) in crayfish. The entire process, from room-temperature substrate preparation to detection completion, takes less than 20 min. The AgNS/PTFE flexible substrate not only provides excellent hydrophobicity for signal enhancement with minimal sample volumes (2 μL) but also ensures good uniformity, resulting in a homogeneous and dense distribution of SERS-active hot spots with superior anti-interference properties and mechanical durability. By simple “drop/wipe” operations and data visualization treatment, this method achieved detection limits as low as 10 pg/mL for MG and 7 pg/mL for CV, with in-situ analysis in spiked and actual crayfish samples, demonstrating significant potential for food safety applications.
研究领域:
食品安全
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Yaoping Hu,Zhijin Gao
Crystal violet (CV), a hazardous dye, poses a serious threat to the environment and human health. This motivates us to develop a facile method for its sensitive detection. Herein, we demonstrate a rapid sensing of CV using a novel fluorescent nanomaterial, yellow emissive Se,N-codoped carbon dots (CDs). CDs with an intense photoluminescence peak at 566 nm are synthesized by a hydrothermal technique using selenourea and o-phenylenediamine as precursors. This material shows a high quantum yield of up to 16.7 %. It is found that the yellow fluorescence of CDs can be selectively quenched by CV, which makes them promising for CV sensing. The linearity is obeyed in the range of 0.02–1.60 μM, and the limit of detection is as low as 7.3 nM. After detailed investigations, the inner filter effect is proposed to be the sensing mechanism. For practical usage, the newly built method is applied to determine the trace amount of CV in fish tissue samples, and satisfactory results are obtained.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2015
·
IF 3.091
Xubiao Yu,Chaohai Wei,Haizhen Wu
An unusual decrease of methylene blue’s equilibrium adsorption density ( q e ) with the increasing initial concentration ( C 0 ) was observed in previous studies. Further studies are required to understand the mechanism related to this phenomenon. For exploring the effect of molecular structure on cationic dye’s adsorption, the adsorption behavior of methylene blue (MB) and crystal violet (CV) onto natural vermiculite were investigated. As a comparative dye, CV has the same ionic charge (+1) with MB, but its triangular molecular structure is significantly different with MB’s linear molecular structure. The isotherm results indicated that the MB’s q e at 25 °C decreased from 0.076 to 0.053 mmol g −1 with the C 0 increased from 0.3 to 0.5 mmol L −1 . The Langmuir model was not able to describe its isotherm curves. On the contrary, CV showed a typical Langmuir isotherm with a R 2 of 0.99 at 25 °C. Furthermore, the difference between MB and CV’s adsorption behavior was also reflected in the column experiment. The breakthrough time of MB exhibited a 71% decrease with the influent concentration increasing from 0.25 to 0.50 mmol L −1 , whereas CV only behaved a 45% decrease. Results of this study demonstrate that the molecular structure could be responsible for the unusual decline of MB’s adsorption isotherm under high initial concentrations. Due to the linear structure, the molecules of MB could cause the ‘adsorbate–adsorbate’ steric effect more easily compared to CV, leading a decline of the equilibrium adsorption density. Therefore, the initial concentration of MB should be controlled accordingly to achieve the optimal adsorption performance of natural clays such as vermiculite.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Shangwang Le,Qian Jiang,Hongcheng Pan
A crystal violet-cadmium hydroxyquinoline iodine (CV-CdqI) nanocomposite was synthesized by adsorbing crystal violet (CV) onto cadmium hydroxyquinoline iodine (CdqI) nanowires. The CdqI nanowires were synthesized by mixing 100 mL of an aqueous 0.03 M CdI 2 solution with 100 mL of a 0.01 M 8-hydroxyquinoline ethanol solution in an ultrasonic bath. Scanning electron microscopy showed that CdqI exhibited a regular nanorod morphology with diameters of 30-60 nm and lengths of 400–600 nm. After adsorbing crystal violet, the CdqI nanowires become aggregated to form the CV-CdqI nanocomposite. X-ray powder diffraction (XRD) revealed that the XRD patterns of the CdqI nanowires and CV-CdqI nanocomposite are essentially the same, and no new phase was generated in the XRD pattern after the adsorption of CV. The fluorescence and photoelectrochemical (PEC) properties of the CV-CdqI nanocomposite were investigated. The CV-CdqI nanocomposite emits a yellow-green fluorescence with a maximum emission at 575 nm, which is similar to that of the CdqI nanowires. PEC measurements showed that the photocurrent response of the CV-CdqI nanocomposite spin-coated FTO electrode was stable and repeatable under the periodic on/off illumination of a 300 W xenon lamp at 0 V bias. Furthermore, the CV-CdqI/FTO electrode was used to construct a sensor for the PEC detection of ascorbic acid (AA). In the range of 1.4 to 10 μM, the photocurrent of the CV-CdqI/FTO electrode was inversely proportional to the concentration of AA with a detection limit of 0.2 μM. The method was used for the determination of AA in oranges (varied from 32.1 to 50.8 mg/100 g fresh weight).
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2015
·
IF 1.173
Ling Li,Li Jun Yuan,Wei Hong,Lu Fan,Le Bao Mao,Li Liu
The adsorptions of methylene blue (MB) and methyl violet (MV) from an aqueous solution of Fe3O4/metal-organic frameworks (MOFs) composite were studied in view of the adsorption isotherm, kinetics and regenerate of the sorbent. The adsorption isotherms of MB and MV on Fe3O4/MOFs composite both followed the Langmuir isotherm. Adsorption kinetics were determined from the experimental data. The used Fe3O4/MOFs could be regenerated by acetonitrile, so it can be recycled for use. The excellent adsorption effect and reusability make Fe3O4/MOFs attractive for the removal of MB and MV from aqueous solution. The feasibility of Fe3O4/MOFs for application in magnetic solid-phase extraction was examined.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Guanqun Tang,Huiyin Mo,Le Gao,Yidi Chen,Xu Zhou
The purpose of this study is to investigate the optimal preparation conditions for alkali-modified pomelo peel biochar and to clarify its adsorption process towards crystal violet (CV). The pyrolysis temperature and the alkali-to-carbon ratio of pomelo peel raw materials with varying epidermal layers were evaluated and optimized. Several characterization techniques demonstrated that alkaline modification enhances the adsorption performance of biochar by modifying its pore structure and functional group composition. Notably, the biochar, derived from the outer epidermis of pomelo, modified with an alkali-to-carbon ratio of 2:1 at 900 °C (KC2), exhibited significant adsorption capacity through mechanisms such as pore filling, hydrogen bonding, π-π interactions, electrostatic interactions, and functional groups including C C and C O C. The Freundlich isotherm and the pseudo-second-order kinetic model were determined to be the most appropriate for describing the equilibrium data. Accordingly, KC2 exhibited a maximum adsorption capacity of 805.69 mg/g, which significantly exceeded that of biochar derived from pomelo peel with a basic outer epidermis pyrolyzed at 900 °C (BC-GOP900, 586.7 mg/g). This study ultimately concluded that utilizing pomelo peel biochar, particularly KC2, represents an innovative strategy to address pollution caused by CV while effectively repurposing agricultural waste.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 20
·e202401258
·
IF 1.9
Conglin Zhang,Haichao Li,Bingxuan Du
Graphical In this paper, the activated carbon material AC600 is prepared from lignin as raw material and RbCl as activator at 600 °C, and a series of characterization analysis and thermodynamic experiments are carried out. This study proves that RbCl can be used as an activator for the activation of lignin. In order to prepare carbon adsorbent materials, lignin was used as raw material and rubidium chloride as activator, activated carbon materials were prepared by chemical activation method, and its structure was characterized and its adsorption performance on methylene blue solution was investigated; the adsorption of crystalline violet dye was carried out at different temperatures, and the adsorption thermodynamics was studied. The results showed that: the specific surface area of the activated carbon was 433.32 m 2 /g, the pore volume was 0.2191 cm 3 /g, and the average pore size was 2.0222 nm; the adsorption value of methylene blue could reach 172.0 mg/g, and it could quickly and efficiently adsorb methylene blue solution; the adsorption effect on crystal violet solution was good, and the saturated adsorption amount at 40 °C was up to 279 mg/g, and the removal rate reached 93 %, belonging to the spontaneous adsorption thermodynamic reaction. The experiment proved that rubidium chloride can be used as an activator to activate lignin raw materials to prepare activated carbon samples, and can effectively adsorb dyes.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）