Analytical Methods
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2019
·Vol. 11
·期 15
·2050-2056
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IF 2.378
Jian Zhou,Rong Wang,Zilin Chen
Novel graphene oxide framework (GOF)-modified stainless-steel wires (SSWs) were prepared for stir bar sorptive extraction (SBSE). Then, they were combined with a high performance liquid chromatography-ultraviolet (HPLC-UV) method for the determination of four Sudan dyes (G, I, II, and III) in lake water and fruit juice samples. A GOF composed of graphene oxide (GO) sheets covalently interconnected by 1,4-phenylene diisocyanate (PPDI) was used as the coating material for SBSE. To immobilize the GOF on the chemically resistant surface of the SSW, polydopamine and PPDI were used to functionalize the SSW and act as linkers. The prepared GOF-SSW was applied for SBSE and showed good extraction efficiency towards Sudan dyes under optimized conditions. GOF-SSW-based SBSE was coupled with HPLC-UV for determination of Sudan dyes in aqueous solutions. This method showed good linearity (1–200 ng mL−1 for Sudan G, Sudan I and Sudan II; 1–100 ng mL−1 for Sudan III), low limits of detection (0.15–0.3 ng mL−1) and good reproducibility (relative standard deviation ≤ 5.85%). The proposed method was applied to determine Sudan dyes in lake water and fruit juice samples, and showed good selectivity and good recovery (89.38–108.54%).
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Xiuping Tang,Yu Hou,Qing Bo Meng,Guolin Zhang,Fuxin Liang,Xi-Ming Song
In this work, we developed a continuous non-aqueous flow Pickering emulsion interface catalysis (FPIC) system for heterogeneous acylation. Poly (1-vinyl-3-ethylimidazolium bromide) (PILs) functionalized silica@PS/PDVB Janus particles (JPs) were synthesized. The catalyst H 3 PW 12 O 40 (PA) was then immobilized on PIL-modified JPs by anion-exchanging. The PIL grafted on the silica side and the inherent oleophilic phenyl groups on the other side endow the Janus particle with excellent amphipathy for the immiscible ionic liquid (IL) [BMIM]BF 4 and toluene. Therefore, emulsification and catalytic capability were realized simultaneously on the PA-PILs-JPs. The FPIC column system for acylation reaction was accomplished by packing the IL-in-oil Pickering emulsion into a column reactor, and exhibited excellent catalytic performance, high stability during the reaction process as well as remarkable recyclability.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yingchun Wang,Shan Peng,Xiaomeng Shi,Yanrong Lan,Guangting Zeng,Kunmeng Zhang,Xinxin Li
In this study, fly ash (FA), which is a waste product of common flue gas, was used to effectively fabricate multifunctional superhydrophobic surfaces. FA was first coated with a TiO 2 shell layer to form a core (FA)-shell (TiO 2 ) structure via charge adsorption. FA-TiO 2 was then grafted with polydimethylsiloxane (PDMS) molecules to form FA-TiO 2 -PDMS particles, which exhibited superhydrophobicity. The PDMS molecules were grafted firmly on the TiO 2 shell through covalent bonds, therefore endowing the particles a series of durable properties. The superhydrophobic FA-TiO 2 -PDMS particles mixed with PDMS could form homogenous coating solution, which was coated onto fabrics to obtain superhydrophobic surfaces. The resulting superhydrophobic fabric exhibited the “Lotus-effect” and excellent self-cleaning ability. It also showed excellent photocatalysis ability that could repeatedly photodegrade various oils and dyes. Moreover, the coated fabric showed durable and stable superhydrophobicity, which could withstand repeated abrasion treatments, recycled peeled tests using an adhesive tape, long-duration boiling-water immersion, and recycled solvent immersion. In addition, the surface exhibited strong self-healed superhydrophobicity after a simple heat treatment even after being repeatedly treated by plasma or immersed into a strong alkali/acid solution for 8 h. The superhydrophobic fabrics also achieved self-quenched fire-retardance and could efficiently separate various oil-water mixtures.
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JOURNAL OF CHROMATOGRAPHY A
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2018
·
IF 3.716
Wei Zhou,Chenlu Wang,Xuemei Wang,Zilin Chen
Development of stir bar sorptive extraction (SBSE) device with high stability and extraction efficiency is critical and challenging by date. In this work, etched poly(ether ether ketone) (PEEK) tube with high mechanical strength and large specific surface area was used as jacket for SBSE device. By etching with concentrated sulfuric acid, the smooth outer surface of PEEK become porous with plenty of micro holes, which was beneficial for coating of sorbents and significantly improved the extraction performance. After functionalized by bio-polydopamine method, strong hydrophobic p-naphtholbenzein molecular was immobilized onto the chemical resistant PEEK surface (PNB@E-PEEK) as stationary phase. We also firstly developed a simple detachable dumbbell-shaped structure for improving the workability of PEEK jacket stir bar. The dumbbell-shaped construction can eliminate the friction between stir bar and container, and the design of detachable structure make elution can be accomplished easier with small amount of organic solvent. It was interesting that the developed detachable dumbbell-shaped PNB@E-PEEK stir bar showed exceptional stability and extraction efficiency for SBSE enrichment of multiple analytes including several Sudan dyes, triazines, polycyclic aromatic hydrocarbons (PAHs), alkaloids and flavonoid. By coupling with high performance liquid chromatography-ultraviolet detection (HPLC-UV), PNB@E-PEEK stir bar based SBSE-HPLC-UV method was applied for the analysis of common Sudan dye pollutants. The method showed low limits of detection (0.02-0.03 ng/mL), good linearity (R 2 ≥ 0.9979) and good reproducibility (relative standard deviation ≤ 7.96%). It has been successfully applied to determine three dye pollutants in tap and lake water.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
·
IF 3.235
Ning Kang,Lifei Ji,Jun Zhao,Xian Zhou,Xianjun Weng,Hui Li,Xin Zhang,Fengchun Yang
The electrochemical methods with the advantages of sensitivity, accuracy, low-cost, simplicity and real-time online determination are expected to detect organic dyes, Methyl Orange (MO) and Rhodamine B (RhB), which are harmful to human beings extensively. In this work, Fe 3 O 4 and single-walled carbon nanotubes (SWNTs) hybrid, as a non-noble metal electrocatalyst , was synthesized by hydrothermal method and modified on the electrode to prepare an electro-sensor for monitoring MO and RhB. Due to the synergistic effects between Fe 3 O 4 and SWNTs, the magnified surface area and good dispersion of SWNTs, the Fe 3 O 4 /SWNTs hybrid, has the outstanding superiority of higher-conductivity and catalytical activity with a wide linear concentration range of 0.025–4000 μM, 0.1–250 μM and a calculated low detection limit (LOD) of 4 nM, 25 nM for MO and RhB respectively. Furthermore, it's the first time that the proposed electrode achieves the simultaneous determination of both dyes. Then, from the investigation of kinetics and pH value, it's found that both oxidation reactions involve two electrons and one proton participating. The modified electrode also exhibited good selectivity, high reproducibility and promising feasibility in practical sample analysis.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2018
·
IF 3.974
Weijie Liu,Yanting You,Di Sun,Shiwei Wang,Jingrong Zhu,Cong Liu
Effluents loaded with various synthetic dyes are considered as a huge burden to the surrounding ecosystems. Sudan dyes are relatively difficult to decolorize due to its water-insolubility. In the present study, the strain Shewanella putrefaciens CN32 was firstly applied to decolorize Sudan dyes under the anaerobic condition , and the physicochemical parameters on the decolorization were optimized. The results demonstrated that the suitable decolorization condition was temperature 26 °C, initial pH 7.0–8.0 and NaCl concentrations 0–20 g/L. Electron competitive acceptors including nitrite, nitrate, dimethyl sulphoxide and oxygen could cause the significant inhibition to the decolorization of Sudan dyes. Biosurfactant rhamnolipid played a positive role in enhancing the decolorization of Sudan I. The co-culture of S. putrefaciens CN32 and Bacillus circulans BWL1061 is reported for the first time to accelerate the decolorization through improving the synergistic effect of enzymatic degradation and biological reductive effect. The highest decolorization of 90.23% to Sudan I was achieved within 108 h, suggesting that co-culture technique has a good potential in the treatment of dyeing wastewater. Furthermore, the microbial toxicity tests indicated that the toxicity of Sudan I to Escherichia coli BL21 and Bacillus subtilis 168 was obviously decreased after the decolorization.
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Analytical Methods
·
2019
·Vol. 11
·期 22
·2868-2874
·
IF 2.378
Lifei Ji,Xian Zhou,Jian Zhang,Xin Zhang,Weidong Kang,Fengchun Yang
Organic dye detection requires high sensitivity, low-cost equipment, simplified procedures, and real-time capabilities; thus, electrochemical methods are gradually emerging in this field instead of chromatography. However, much attention has been paid to toxic and complex metal or noble-metal hybrid materials for constructing electrochemical sensors, which is extremely limiting for practical applications. In this study, a metal-free electrocatalyst, MWNTs with carboxylic groups (MWNTs–COOH), was prepared through surface oxidation in a piranha solution and a simple hydrothermal treatment. The obtained MWNTs–COOH possessed superior hydrophilicity, increased conductivity and substantial active carbon or carboxylic group sites, as determined by characterization using Raman spectroscopy, contact angle measurements, electrochemical surface area analysis, and X-ray photoelectron spectroscopy. The above advantages enabled MWNTs–COOH to exhibit excellent electrochemical activities, with a satisfactory utilization for determining trace Rhodamine B (RhB), showing a lower calculated detection limitation of 2.66 nM and a wider linear range from 0.05 to 850 μM with outstanding specificity and reproducibility. Furthermore, it was found that the carboxyl group on the MWNTs would probably have triggered the electron redistribution and exposed more adjacent active carbon sites, which facilitate the electrocatalytic function to CN on the RhB directly.
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TALANTA
·
2018
·
IF 4.244
Xu Ling,Zilin Chen
Herein a facile method for immobilization of zeolitic imidazolate frameworks (ZIFs) was developed. The ZIFs grew on electrochemically deposited zinc oxide (ZnO) layer while carbon fiber bundle served as substrate. The synthesized ZIFs-ZnO composite was packed into PEEK tube as sorbent for online solid phase microextraction (SPME)-HPLC-UV analysis of Sudan dyes. Good enrichment efficiency (200–461 fold), low limits of detection (0.002 ng mL −1 ) and wide linear ranges (0.02–20 ng mL −1 , correlation coefficient > 0.9996) were achieved. The analytical method was demonstrated to be practical for analysis of Sudan dyes in environmental water samples with good recoveries (83.5%~95.0%).
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Analytical Methods
·
2013
·Vol. 5
·期 4
·925-930
·
IF 1.855
Yajing Lei,Shujie Zhang,Lizheng Fang,Muhammad Sajid Hamid Akash,Weixing Shi,Kedan Sun,Yingchun Xu,Shuqing Chen
Tartrazine is commonly used in foodstuffs, its level is controlled by government, however, it is still used in some food products at levels which are not permitted. We aimed to develop a sensitive and simple method to assess the exposure to tartrazine in pregnant women and the general population in China. A competitive enzyme-linked immunosorbent assay (ELISA) was developed based on polyclonal antibodies for tartrazine. Using this assay, we measured the urinary concentrations of tartrazine in the participants. Under optimal experimental conditions, the standard curve was constructed at concentrations of 0.04–1000 ng mL−1 and the limit of detection (LOD) was set at 0.04 ng mL−1. No cross-reactivity of the antibody was observed with seven other artificial dyes based on this assay. Human blank urine was spiked with tartrazine at concentrations of 0.1, 25, 500 ng mL−1 and analyzed by ELISA, the recoveries of tartrazine were from 99.8% to 106.6% and coefficients of variation were from 3.28% to 14.9%. The study comprised of 351 volunteers (age: 19–69 years), of which 30% were male, 16% were nonpregnant women and 54% were pregnant women. The geometric means for tartrazine in three groups were 2.64, 2.44 and 3.21, respectively. No difference was observed in these groups. The values indicated that both the general population and pregnant women are exposed to tartrazine. Sources of exposure, potential health effects and risk assessment require further investigation.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2015
·
IF 2.729
Meiling Wang,Zhengnian Chen,Yaomin Chen,Chunjin Zhan,Jianwei Zhao
Positively charged gold nanoparticles (AuNPs) were self-assembled onto the surfaces of 1-allyl-3-methylimidazolium chloride (AMIM-Cl) functionalized reduced graphene oxide sheets (RGO) here. The AMIM-Cl functionalized RGO (ILRGO) loaded with AuNPs (ILRGO@AuNPs) modified glass carbon electrodes (GCEs) possess larger effective specific surface areas which can favor the adsorption of more Sudan I into the working electrode . So the ILRGO@AuNPs composites were successfully used for the fabrication of a facile and sensitive sensor for the determination of Sudan I. And the prepared sensor exhibits a broad linear range for Sudan I spanned 4 orders of magnitude from 1.0 × 10 − 10 to 1.0 × 10 − 6 M and a detection limit as low as 5.0 × 10 − 11 M (S/N = 3). It is expected that this green sensor can be applied in the determination of other similar dyes.
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APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Kaihang Chen,Zuguang Shen,Jiwen Luo,Xiaoying Wang,Runcang Sun
There is an urgent need to develop a highly sensitive detection system for detecting trace amounts of food contaminants. In this study, optimal synthesis of silver nanoparticles (Ag NPs) with stable and narrow size distribution in the range of 15–25 nm was performed under microwave irradiation, using quaternized chitosan (QCS) as reducing and stabilizing agent. The results showed that the ratio of QCS to [Ag(NH 3 ) 2 ] + , reaction temperature, irradiation time, the degree of substitution ( DS ) and molecular weight ( Mw ) of QCS had obvious effects on the formation, particle size and size distribution of Ag NPs. In addition, utilizing QCS/Ag NPs composite as SERS substrate, tricyclazole and Sudan I could be rapidly and sensitively detected with the limit of detection (LOD) as low as 50 ppb and 10 ppm, respectively. Compared with previously reported works, our detection system are of great stability and operability. The QCS was coated on the surface of Ag core, avoiding aggregation of Ag NPs and creating hot spots, in turn, providing superior amplification of SERS. Thus, it is believed that the QCS/Ag NPs composite could be considered as an ideal SERS-active substrate for detection of food contaminants.
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JOURNAL OF CHROMATOGRAPHY A
·
2015
·
IF 4.169
Chengjiang Zhang,Gongke Li,Zhuomin Zhang
Covalent organic polymers (COPs) connected by covalent bonds are a new class of porous network materials with large surface area and potential superiority in sample pretreatment. In this study, a new hydrazone linked covalent organic polymer (HL-COP) adsorbent was well-designed and synthesized based on a simple Schiff-base reaction. The condensation of 1,4-phthalaldehyde and 1,3,5-benzenetricarbohydrazide as organic building blocks led to the synthesis of HL-COP with uniform particle size and good adsorption performance. This HL-COP adsorbent with high hydrophobic property and rich stacking π electrons contained abundant phenyl rings and imine ( C N) groups throughout the entire molecular framework. The adsorption mechanism was explored and discussed based on π–π affinity, hydrophobic effect, hydrogen bonding and electron–donor–acceptor (EDA) interaction, which contributed to its strong recognition affinity to target compounds. Enrichment factors were 305–757 for six Sudan dyes by HL-COP micro-solid phase extraction (μ-SPE), indicating its remarkable preconcentration ability. Furthermore, the adsorption amounts by HL-COP μ-SPE were 1.0–11.0 folds as those by three commonly used commercial adsorbents. Then, HL-COP was applied as adsorbent of online μ-SPE coupled with high performance liquid chromatography (HPLC) for enrichment and analysis of trace Sudan dyes in food samples with detection limit of 0.03–0.15 μg/L. The method was successfully applied for online analysis of chilli powder and sausage samples. Sudan II and Sudan III in one positive chilli powder sample were actually found and determined with concentrations of 8.3 and 6.8 μg/kg, respectively. The recoveries of chilli powder and sausage samples were in range of 75.8–108.2% and 73.8–112.6% with relative standard deviations of 1.2–8.5% and 1.9–9.4% ( n = 5), respectively. The proposed method was accurate, reliable and convenient for the online simultaneous analysis of trace Sudan dyes in food samples.
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