DIAMOND AND RELATED MATERIALS
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2023
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IF 4.1
Song He,Junwei Sun,Xin Jin,Qilin Chen,Xiya Wu,Fuliang Tian,Xiaoqian Zhang,Ping Li,Hongliang Sheng
In this study, a microporous activated carbon (AC) with excellent performance was successfully prepared by KOH impregnation activation method using edamame shell as raw material. The synthesized AC with high specific surface area and pore volume can be effectively used for the adsorption and removal of Congo red (CR) from wastewater. Nitrogen adsorption isotherms , Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS) and zeta potential were used to characterize the structure of activated carbon. The ultra-high surface area and well-developed pore volume provided sufficient adsorption sites for CR adsorption, and the maximum adsorption effect of AC on CR was up to 1509.60 mg/g at 25 °C. The effects of pH, contact time, temperature and adsorbent mass on CR adsorption were investigated. In addition, the effects of different cations (Ca 2+ , Na + , K + , NH 4 + ) on the CR adsorption of anionic dyes were focused by adding different concentrations (10 mM, 20 mM, 30 mM) of cations. The results showed that Ca 2+ , Na + and K + had a significant promotion effect on the CR adsorption of AC, among which Ca 2+ had the most obvious promotion effect. Through model fitting, CR adsorption by AC conforms to Liu adsorption isotherm model and Elovich kinetic model . The results showed that the addition of cations could substantially improve the adsorption capacity of AC on the anionic dye CR, which has potential application in the field of dye wastewater treatment .
研究领域:
环境科学
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材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Zihao Ma,Ying Han,Fuqiong Xu,Xing Wang
As a synthetic pigment, Sudan red is commonly used as a food additive and is harmful to the human kidney and can even cause cancer. In this work, we developed a one-step strategy to synthesize lignin-based hydrophobic deep eutectic solvents (LHDES), which were fabricated via methyltrioctylammonium chloride (TAC) as hydrogen bond acceptor and alkali lignin as hydrogen bond donor. LHDES with different mass ratios were synthesized and the mechanism of formation was determined by different characterization techniques. The synthetic LHDES was used as the extraction solvent to establish a vortex-assisted dispersion-liquid microextraction method for the determination of Sudan red dyes. The practicality of LHDES was evaluated by applying it to the detection of Sudan Red I in real water samples (seawater, river water) and duck blood in foodstuffs, and the obtained extraction rate reached up to 98.62 %. The method is simple and effective for the determination of Sudan Red in food.
研究领域:
环境科学
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分析化学
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食品安全
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PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
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IF 3.232
Yaoping Hu,Zhijin Gao
In this paper, we exploit an innovative strategy to reuse waste rubber tires as a low-cost source for the fabrication of a high-value material, fluorescent carbon dots (CDs). In the hydrothermal condition, ammonium persulphate is utilized to oxidize the tires and offer nitrogen atom for doping, to produce CDs with a high quantum yield (QY) of up to 23.8%. Such a QY is outstanding among the reported waste-derived CDs. It is found that the fluorescence of CDs can be remarkably quenched by Sudan I–IV with negligible interference from other substances. The corresponding linear ranges are 0.5–60, 0.5–60, 1–70, and 1–70 μM, and limits of detection are 0.17, 0.21, 0.53, and 0.62 μM for Sudan I, II, III, and IV, respectively. Systematic investigations reveal that the fluorescence quenching mainly stems from the inner filter effect. Moreover, the CD-based sensor shows an excellent applicability for the assay of Sudan dyes in chili powder sample.
研究领域:
分析化学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2022
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IF 8.91
Jia Liu,Shengzhi Wei,Huili Zhang,Yimin Deng,Jan Baeyens,Raf Dewil,Nick Sweygers,Lise Appels
Adsorption is a widely applied waste water treatment technology , especially for removing micro-pollutants and dyes of industrial effluents . Over the past decade, adsorbing metal oxide micron- and nano-particles have been successfully developed and investigated as adsorbents. In the present research, Mg-ferrite adsorbent particles were synthesized and their properties were fully determined. The pore volume is 0.139 cm 3 /g. The BET analysis reveals a surface area of 94.4 m 2 /g. The porosity is of meso- and microporous nature. The adsorbent was used to adsorb acid fuchsine, an important industrial dye. The equilibrium adsorption capacity was 796.4 mg/g, with an adsorption yield of 78.7–82.0%. The adsorption kinetics can be adequately fitted by a pseudo-second-order model. The isotherms of both Langmuir and Freundlich are applicable. The stability, recovery and reuse of the ferrite particles were proven in multi-cycle experiments, and the adsorption activity decreased by less than 3% between the first and fifth cycle. Experimental and fitting results were finally used to design a batch adsorber to remove a given concentration of acid fuchsine from different volumes of wastewater.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
RSC Advances
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2020
·Vol. 10
·期 70
·42633-42643
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IF 3.119
Runshan Chu,Yue Zhang,Tieling Xing,Guoqing Chen
CI disperse red 896 was used as a representative disperse red dye to investigate the stability of inkjet printing colour paste. Various additives were added to the dye in different mass fractions to study the thermal stability and freeze–thaw stability of the ink in terms of average particle size, viscosity, and surface tension. The centrifugal stability of the colour paste and ink was characterised by their specific absorbance. When grinding the colour paste, use of a defoamer can improve the grinding efficiency, without affecting the stability of the paste. The most stable ink prepared from the colour paste contained 20–35 wt% paste. Ethylene glycol and glycerol were combined and their amounts controlled respectively at 6–14 wt%. The triethanolamine content was <1 wt% when the fatty alcohol polyoxyethylene ether content was 0.2 wt%. The sodium dodecyl sulphate content should be less than 0.15 wt%, and that of polyvinylpyrrolidone-K30 should be <0.7 wt%.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
Applied Water Science
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2017
·Vol. 7
·期 8
·4247-4254
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IF 0
Fu Likang,Zhang Gengwei,Wang Shixing,Zhang Libo,Peng Jinhui
A new adsorbent was fabricated via grafting polyethyleneimine (PEI) on activated carbon (AC) to remove anionic amaranth from water. X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy were used to characterize the grafting process of PEI. The adsorption behavior of the anionic amaranth (AM) on the modified AC is further evaluated by adjusting pH, the modified AC dosage, contact time and the initial AM concentration. AM adsorption was dramatically dependent of solution pH and the optimum pH is 1.08. The adsorption rate was very high within 20 min and equilibrium was achieved at 180 min. The maximum adsorption amount of AM on the modified AC is 72.68 mg/g at pH 1.08. Compared with the unmodified AC, the adsorption efficiency on the modified AC was dramatically increased from 29.9 to 97%. An electrostatic interaction mechanism was proposed in the acidic solution. The adsorption isotherms were consistent with the Langmuir model and the obtained kinetic data were in accordance with a pseudo-second order adsorption behavior for the modified AC.
研究领域:
环境科学
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材料科学
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DOI
MICROCHIMICA ACTA
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2014
·Vol. 181
·期 9
·1069-1075
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IF 3.719
Ling Yu,Li Jia Xing,Qu Fei,Li Nian Bing,Luo Hong Qun
We report that the intensity of the blue fluorescence of copper nanoclusters coated with polyethyleneimine (PEI) is strongly reduced in the presence of the food dyestuffs Sudan I-IV. This finding was exploited in a label-free fluorescence assay for these Sudan dyes both in ethanol and aqueous solutions. The PEI-capped nanoclusters have an average diameter of 1.8 nm and are displaying, under 355 nm excitation, a blue emission at 480 nm that matches the absorption bands of the Sudan dyes. The clusters are stable in solution for at least 1 month. Under optimum conditions, this assay can be applied to the quantification of the dyes Sudan I, II, III, and IV, respectively, in the 0.1−30, 0.1–30, 0.1–25, and 0.1–25 μM concentration ranges, and the detection limits (3σ/slope) are 65, 70, 45, and 50 nM, respectively. The capability of reducing the fluorescence of the PEI-capped copper nanoclusters is directly related to the number of the functional groups in that Sudan III and IV give lower detection limits. This analytical scheme exhibits a remarkably high selectivity for the Sudan dyes over potentially interfering substances. The method was successfully applied to determine Sudan I, II, III, and IV in hot chilli powder.
The blue fluorescence emission of copper nanoclusters coated with polyethyleneimine (PEI) is strongly reduced in the presence of Sudan I-IV. This finding was exploited in a label-free fluorescence assay for these Sudan dyes both in ethanol and aqueous solutions.
研究领域:
分析化学
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食品安全
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纳米技术
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DOI
高影响因子
CHEMICAL PAPERS
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2024
·Vol. 78
·期 8
·4827-4839
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IF 2.1
Zhang Zhijian,Luo Wenjun
A novel monolithic amidogen-rich biomass adsorbent was successfully prepared. Corn bract (CB) was employed as adsorbent matrix, and arginine (Arg) was selected as a bonding bridge between the hydroxyls on cellulose that came from CB and modifier molecules to enrich reactive sites and improve reaction activity. Polyethyleneimine (PEI) was then grafted to the surface of CB in a heterogeneous reaction. The resultant CB-g-PEI (CB-grafted-PEI) held a grafting ratio of 60.6%. And the maximum adsorption for (acid red 18) AR18 was reached 506.7 mg/g. As a necessary content of adsorption behavior research, models about isotherm adsorption, adsorption kinetics and adsorption thermodynamics were all inspected. According to the research conclusions obtained, the pseudo-second-order model provides the best explanation for the kinetics of adsorption. The adsorption isotherm of AR18 is in better agreement with the Langmuir isotherm model. The adsorption and desorption experiments were conducted over 6 times. The samples were characterized using FT-IR, SEM and EDS. The study suggests that the CB-g-PEI is an available adsorbent. Graphical abstract
研究领域:
环境科学
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材料科学
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高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2015
·
IF 0.795
Wei Yao,Pinhua Rao,Wenqi Zhang,Liang Li,Yingjie Li
In this study, thermo-sensitive magnetic cationic hydrogel (TSMCH) based on (3-acrylamidopropyl) trimethyl ammonium chloride (APTMACl) and N-isopropylacrylamide (NIPAm) was synthesized by free radical copolymerization. The TSMCH was characterized with Fourier transform infrared spectroscopy, thermal gravimetric analysis, x-ray diffraction, scanning electron microscope with energy dispersive x-ray, vibrating sample magnetometer, and zeta potential, and employed as adsorbent for adsorbing reactive red (RR) dye. Effects of molar ratios of APTMACl to NIPAm on the adsorption capacity of TSMCH were studied, and the results showed that a maximum adsorption capacity (1428.57 mg RR g−1 TSMCH) had been achieved when the molar ratio of APTMACl to NIPAm was 1:1. The adsorption isotherm of RR was well fitted by the Langmuir isotherm equation. TSMCH had good selectivity for adsorbing RR. Solution pH hardly affected the adsorption of RR on the TSMCH. The adsorption amount of RR increased with the increase of temperature. The adsorption–desorption of TSMCH was evaluated in three circles and a high regeneration rate was demonstrated.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Fang Wang,Long Li,Jibran Iqbal,Zhuoran Yang,Yiping Du
In this study, the magnetic chitosan biochar (MCB) was magnetized by chemical coprecipitation after loading chitosan with Schiff base reaction. The prepared MCB was used to remove amaranth dye in solution. The synthesized MCB was characterized to define its surface morphology and specific elements. The amaranth dye adsorption system was optimized by varying the contact time, pH, and initial concentration. The adsorption of MCB on amaranth dye was measured in a wide pH range. According to Zeta potential , the surface of MCB was positively charged in the acidic pH region, which was more conducive to the adsorption of anionic amaranth dye. In addition, the adsorption data was fitted with the pseudo-first-order model and Langmuir adsorption model and the maximum adsorption capacity reached 404.18 mg/g. The adsorption efficiency of MCB was still above 95% after three cycles of adsorption and desorption. The removal percentage in the real sample of amaranth dye by MCB was within 94.5–98.6% and the RSD was within 0.14–1.08%. The MCB adsorbent with advantages of being easy to prepare, easy to separate from solution after adsorption, has good adsorption performance for amaranth dye and is effective potential adsorbent to remove organic anionic dye in wastewater.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Zhang Hongmei,Yang Yunxia,Wang Yanqing
Sudan dyes are recognized as carcinogens, which are strictly determined whether there are them in food for food safety. Hence, in order to understand the mechanism at the molecular level, this work investigated the binding interactions of Sudan I-IV with calfthy mus DNA. The synchronous fluorescence and UV–vis spectral results suggested the complex formation between Sudan I-IV and ct-DNA. EB and Hoechst 33258 displacement experimental results confirmed the binding sites of Sudan I-IV in ct-DNA and the minor groove-binding mode of Sudan I-IV with ct-DNA. The molecular modeling computational method also proved binding mode, which is consistent with the spectral experiments. In addition, the aromatic rings of Sudan I-IV play important roles in binding with DNA. Compared to Sudan I and II, the increase of molecular conjugation system enhances the binding abilities of Sudan III and Sudan IV with DNA. Vdm + Hbond + desolv energies of them are the main contribution of their combined energies.
研究领域:
生物化学
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食品安全
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分子生物学
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PubMed
高影响因子
WATER AND ENVIRONMENT JOURNAL
·
2018
·Vol. 32
·期 4
·630-636
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IF 1.224
Amin Ghasemi,Zarrin Es'haghi,Mohammad Reza Jamali
In this research, the amine functionalized magnetic silica-based nanocomposite as a solid-phase extraction adsorbent coupled with high-performance liquid chromatography was applied for the preconcentration and determination of Sudan dyes in environmental waters and a food sample. The synthesized core-shell Fe 3 O 4 @silica nanoparticles were functionalized with amino groups and characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy techniques. The experimental parameters optimized and under the best conditions, the sorbent was successfully used to extract the target analytes. The result showed that a good linearity with a r -value of greater 0.990, and the limits of detection were from 0.082 to 0.12 µg L −1 . The relative recoveries obtained by analysing the spiked water samples were in the range of 90–102% and the relative standard deviations were between 0.590 and 7.94%.
研究领域:
环境科学
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分析化学
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DOI
高影响因子
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