SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Ruoyu Dai,Yaoping Hu
Quantitative determination of hazardous synthetic colorants in food is quite essential for human health. Herein, a ratiometric fluorescence method is developed for sensitive and selective detection of acid red 18 (AR18) using green/red dual emissive carbon dots (g/r-CDs) as probes. The as-synthesized g/r-CDs exhibit two emission peaks at 508 and 610 nm under excitation of a UV light. When AR18 is added, the green fluorescence of g/r-CDs at 508 nm is quenched dramatically due to the strong inner filter effect; in contrast, the red fluorescence at 610 nm decreases much more mildly. The intensity ratio of I 610 /I 508 has a good linearity with the AR18 concentration over the range of 0.05–8.00 μM. A detection limit of 16 nM is obtained, much lower than the most values reported by former analytical methods. Based on the g/r-CD sensor, accurate determination of AR18 in drinks and candy is successfully realized, demonstrating the good practicability of the proposed method for AR18 monitoring in real samples.
研究领域:
分析化学
·
食品安全
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2013
·
IF 2.004
Shi Wang,Yan-Yun Zhai,Qiang Gao,Wen-Jun Luo,Hua Xia,Cheng-Gang Zhou
A new strategy to retrieve chitosan-decorated carbon nanotube (CS/CNT) from aqueous dispersion was proposed. The CS/CNT, prepared via a “surface deposition–crosslinking” method, exhibited an aggregation microstructure with plentiful interstitial spaces. By introducing magnetic nanoparticle (MNP) into CS/CNT dispersion solution, MNP was embedded in the CS/CNT aggregates, which endowed the CS/CNT with magnetic retrievability. Using this strategy, a simple and convenient operation for the removal of anionic azo dye (acid red 18 (AR18)) was achieved by directly adding CS/CNT and MNP into the dye solution, where CS/CNT acted as an adsorbent and MNP enabled all CS/CNT aggregates to be magnetically retrievable. Effects of pH, ionic strength, contact time, temperature, and initial AR18 concentration on adsorption efficiency were investigated. Results showed that AR18 adsorption could achieve equilibrium quickly and the maximum adsorption capacity could be up to 809.9 mg·g–1 at 323.15 K. Full kinetic and thermodynamic investigations as well as isotherm analysis were also undertaken. Moreover, the reusability of magnetically retrievable CS/CNT was evaluated, and the result showed that the removal of AR18 was kept relatively constant (99.11 % to 99.76 %) in 10 consecutive cycles. The study suggests that the magnetically retrievable CS/CNT is a promising adsorbent for removal of anionic azo dyes from aqueous solution.
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
CHEMICAL PHYSICS LETTERS
·
2018
·
IF 1.686
Wei-Xing Zhang,Lu Lai,Ping Mei,Yan Li,Yu-Hang Li,Yi Liu
A natural biosorbent prepared from wheat bran (WB) and multiple quaternary ammonium salts (MQAS) was used to remove dye (AR-18) from aqueous solution. The adsorption kinetics and thermodynamic mechanism of the adsorption of AR-18 on MQAS-WB were also examined. Results reveal that adsorption isotherm data can be well described by Langmuir model. The calculated thermodynamic parameters indicate that the adsorption is exothermic and spontaneous. The adsorption kinetics follows the pseudo-second-order model. MQAS-WB shows potential for large-scale wastewater treatment. Dynamic adsorption studies reveal that the dye removal efficiency of the packing column of MQAS-WB is higher than that of raw WB.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Chaoying Zhang,Yunguang Yu,Hong Wei,Kebin Li
AgCl was incorporated with clay montmorillonite to improve the individual catalytic or adsorption performance. A green method was proposed to synthesize AgCl/montmorillonite composite by intercalating silver-ammonia complexes into the interlayers of montmorillonite followed by reacting with HCl vapor to in situ form AgCl particles on montmorillonite. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscope, energy dispersive X-ray spectroscopy, transmission electron microscope, Brunauer–Emmett–Teller analysis, X-ray photoelectron spectra, and UV–vis diffuse reflectance spectrum. It was shown that AgCl not only intercalated into the interlamination of montmorillonite but also anchored on its exterior surfaces. AgCl on clay surface was cube-like particles, which were dominated by the higher activity of {1 0 0} planes. The photocatalytic activity of AgCl/montmorillonite (AgCl-Mt) composites were evaluated by degradation of azo dye Acid Red 18 (AR18) under UV-irradiation. AgCl in AgCl-Mt composites had an optimum amount. When 3CEC of silver-ammonia was used to prepare [Ag(NH 3 ) 2 ] + -exchanged Mt, the obtained 3AgCl-Mt had the best activity. The degradation of 50 mL AR18 at pH 6 with 1 g L −1 of catalyst only needed 10 min. The low pH and dye concentration, and high catalyst loading favored the removal of dye. Moreover, the superoxide radicals and holes were found to be major reactive species responsible for the photocatalytic degradation of AR18. PL revealed that besides reducing the aggregation of AgCl and tailoring morphology of AgCl, montmorillonite also suppressed the combination of photogenerated electron-hole pairs, and thus enhanced the photocatalytic activity and stability. This study may offer an efficient approach for fabricating silver-halide-based composite photocatalysts for environmental cleanup.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yan Liu,Qiang Gao,Chen Li,Shu Liu,Kaisheng Xia,Bo Han,Chenggang Zhou
Adsorption using monolithic adsorbents is an attractive emerging technology for water treatment, but it still remains a great challenge to facilely combine microscopically a well-developed surface functionality with a macroscopic architecture. In this work, we reported a simple, low-cost, and effective method for constructing uniform coating of crosslinked polyethyleneimine (PEI) on monolithic melamine sponge (MS) through pre-modification with polydopamine (PDA), followed by a rotary evaporation-driven “crosslinking–surface deposition” process. Due to the amine groups-rich surface and highly open porous structure, the resulting monolithic adsorbent (PEI@PDA/MS) exhibited high adsorption capacities and fast adsorption kinetics toward Pb(II) (231.81 mg g −1 ; < 100 min) and acid red 18 (AR18, 464.53 mg g −1 ; < 180 min). Moreover, PEI@PDA/MS possessed excellent shape memory property and could be manually collected with tweezers, indicating its great operational convenience in recycling. Cyclic adsorption/desorption experiments confirmed its satisfying reusability. Continuous flow adsorption behaviors of the PEI@PDA/MS monolith were further investigated by directly using it as stationary phase, which also exhibited high removal efficiencies for Pb(II) and AR18. Besides, adsorption mechanisms based on the characterization analyses were also proposed. Our study provides an effective strategy for fabricating high-quality PEI-based monolithic adsorbents with great potential to be used in environmental remediation.
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
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 26
·12696-12702
·
IF 3.925
Jiaman Liu,Jiping Jia,Huaqiang Yu,Jialin Zhang,Ji Li,Honghua Ge,Yuzeng Zhao
Nanoporous carbon (NPC) with microporous, mesoporous, and macroporous composite structures was designed and a new electro-Fenton cathode material was prepared by loading NPC onto graphite felt (GF) in this paper. The surface morphology and electrochemical properties of this material have been analyzed. The results show that the NPC obtained by carbonizing the composite of multi-walled carbon nanotubes and zeolite imidazole skeleton-8 has rich porosity and large specific surface area, which promotes the two-electron oxygen reduction reaction. Compared with the original GF, the NPC/GF electrode loaded with NPC has a higher current response and a lower charge transfer resistance. This modification has significantly improved the performance of the cathode to produce H2O2. Under the optimum conditions, the H2O2 yield of the NPC/GF electrode is about 17 times higher than that of the original GF and the degradation rate of acid red 18 (AR 18, 100 mg L−1) can reach 98.18% within 2 hours. After eight cycles, the H2O2 output of the NPC/GF cathode did not decrease significantly and the degradation rate of AR18 was still higher than 95%, indicating that the NPC/GF electrode has good reusability and certain practical value.
研究领域:
材料科学
·
环境工程
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Yong Chen,Jiandi Huang,Yannan Ma,Hui Xu
The limitation of low energy density of carbon-based supercapacitors can be broken through introducing redox mediators into the electrolyte. Herein, biomass porous carbon CPPS-2 with a high specific surface area of 1649 m 2 /g was prepared by KOH activation. Capitalizing on the adsorption property of porous carbon, redox mediator, acid red 18 (AR18), was confined into the nanopores of CPPS-2 to fabricate the CPPS-2-18 electrode. After adsorbing 2.72 mg AR18, the specific capacitance of CPPS-2-18 is 568F/g at a current density of 1 A/g in 1 M H 2 SO 4 , which is as same as that of CPPS-2 in 1 M H 2 SO 4 + 10 mM AR18, however, the rate performance and coulombic efficiency of CPPS-2-18 are higher than those of CPPS-2. The results reveal that the redox reaction in nanopores of CPPS-2-18 is more reversible than that on the surface of CPPS-2. Meanwhile, the symmetric supercapacitor based on CPPS-2-18 achieves a maximum energy density of 23Wh/kg and power density of 6000 W/kg. Besides, the self-discharging behavior of CPPS-2 is restrained by confining AR18 into the nanopores.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
BIOCATALYSIS AND BIOTRANSFORMATION
·
2014
·
IF 1.093
Mei Guo,Rong Jia,Xueting Yang
To optimize operating conditions for the decolorization of the azo dye Acid Red 18 (AR18) by crude manganese peroxidase (MnP), some important factors affecting enzymatic decolorization were systematically investigated. Under the optimal enzyme reaction conditions, a decolorization efficiency of more than 82.3% was achieved after 60 min treatment. Furthermore, the manganese chelators, malate, tartrate, and lactate were found to be more favorable for the decolorization of AR18 than malonate, acetate, succinate, maleate, oxalate, and citrate. However, the presence of NaCl or Na2SO4 had a negative impact on the decolorization of AR18. The Km and Vmax values of MnP for AR18 were 169.66 μmol L− 1 and 20.63 μmol L− 1 min− 1, respectively. The decolorization of AR18 by MnP followed second-order reaction kinetics with respect to the dye concentration. The decolorization rate constant increased with increasing temperature from 20°C to 35°C, which indicated an activation energy (Ea) of 15.87 kcal mol− 1 and frequency factor (k0) of 1.36 × 108 mg− 1 L min− 1 according to the Arrhenius equation. The results obtained provide experimental data for the application of crude MnP for the decolorization of AR18, and help to elucidate the biochemical mechanism of dye decolorization by the enzyme.
研究领域:
环境生物学
·
酶学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Feifei Lu,Aiqin Dong,Guanjun Ding,Ke Xu,Jumei Li,Lijun You
Magnetic porous Fe 3 O 4 /MRCS polymer composite was prepared by reacting melamine-formaldehyde resin with chitosan in the present of amino modified Fe 3 O 4 nanoparticles and used as adsorbent for acid red 18 azo dye removal. The Fe 3 O 4 /MRCS was characterized by TEM , SEM, XRD, TGA and BET analysis. The Fe 3 O 4 /MRCS possessed high BET surface area (226.6 m 2 /g), characteristic pore properties and facile magnetic separation function. The average pore width is 6.5 nm and the pore volume was 0.68 cm 3 /g. The Fe 3 O 4 /MRCS presented enhanced high adsorption performance toward acid red 18. It removed 99. 65% of acid red 18 (100 mg/L) when the adsorbent amount was over 0.8 g/L. It was found the absorption was depended on pH and the removal efficiency decreased with pH increased. The maximum adsorption capacity of acid red 18 reached as high as 301.0 mg/g. The adsorption kinetic followed the pseudo-second-order kinetics model and the activation energy of the adsorption process was 38.40 kJ/mol. The adsorption isotherms were best fitted to the Redlich–Peterson isotherm equation. Thermodynamic studies indicated the adsorption process was spontaneous and endothermic in nature. The adsorption mechanism study showed the adsorption was a heterogeneous chemisorption process with multiple interactions, involving pore filling, electrostatic attraction, affinity interaction, intra-particle diffusion, π-π interaction and polymer chain inclusion and polymer net trapping. In comparison with other reported adsorbents, the magnetic porous Fe 3 O 4 /MRCS showed superior adsorption performance for acid red 18 removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 37
·17767-17775
·
IF 3.925
Ji-Ping Jia,Yu-Lu Zhang,Jin-Yu Gou,Yi-Xuan Zhang,Yu-Ke Dai,Hong-Hua Ge,Yu-Zeng Zhao,Xin-Jing Meng
A Ti/SnO2–Sb–Cu–Zn electrode was prepared for the electrocatalytic oxidation of Acid Red 18 (AR18). The addition of Zn to the coating results in smaller surface cracks and greater roughness. When Cu and Zn coexist, high-index crystal planes are generated on smaller-sized grains formed on the coating surface, which allows the coating surface to adsorb oxygen. Sb5+ and the adjacent Cu2+–Zn2+ on the surface of the Cu–Zn co-doped coating are the advantageous active sites for adsorbed oxygen. The electrode exhibits a larger electrochemically active surface area and smaller electrochemical reaction resistance. The appearance of high-index crystal planes is beneficial to improve the electrocatalytic activity of the electrode, although the oxygen evolution potential of the electrode is not greatly improved. Cu–Zn co-doping produces synergistic mineralisation and enhances the ability to degrade AR18, and ˙OH is the main active species. During the thermal decomposition of the coating, Zn induces Cu to form more active sites on the high-index crystal planes of SnO2, a phenomenon that may be responsible for the synergistic production of more reactive oxygen species on the electrode surface.
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
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Yong Chen,Wenchao Long,Hui Xu
To improve the adsorption ability of polypyrrole(PPy), the cheap and readily available biological resources chitosan (CS) was introduced to synthesize PPy-CS composites that were uesed to remove Acid Red 18 (AR-18). The structure and morphology of PPy-CS (9:3) composites were characterized by scanning electron microscopy (SEM), Zata potential, Brunauer-Emmett-Teller (BET), and Fourier transform infrared (FT-IR). Various factors were investigated to analyze how to affect the removal process. The reaction model between PPy-CS (9:3) and AR-18 was estimated by adsorption isotherm , thermodynamic parameters, and kinetic studies . The results showed that the adsorption was a spontaneous and endothermic process and the maximum adsorption capacity reached 285.71 mg/g. The removal mechanism suggested that electrostatic attractions and hydrogen bonding played essential roles during the adsorption. Additionally, the species and numbers of functional groups of dyes' molecules exerted a certain influence on the removal process. Also, PPy-CS (9:3) composites still exhibited removal efficiency of 70.83% after six regeneration cycles, which will be helpful in the practical application.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
Houwen Hu,Haoming Xing,Linfan Wang,Ting Zhang,Guoqiang Guo,Tingting Li,Xu Wang,Da Chen
The widespread presence of acid red 18 (AR18) in the environment has raised concerns about the potential risks on human health and ecosystems. Herein, upon addition of AR18, nitrogen- doped carbon dots ( N -CDs) synthesized with catechol and 3, 3-diaminobenzidine exhibit interactive behavior with AR18. Therein, the emission peaks at 490 nm and 410 nm are quenched by internal filtering effect (IFE) and fluorescence resonance energy transfer (FRET). Notably, the former experiences a rapid decline due to robust FRET efficiencies. On this basis, a N -CDs-based fluorimetric and colorimetric sensor is developed for sensitive and selective detection of AR18 in concentrations ranging from 0.053 to 100 μM with a low detection limit (LOD) of 53 nM. In addition, a smartphone-based dual-recognition device, integrated with composite film that enhances liquid collection in determination zone, is aimed at the sensitive detection of AR18 in food samples. The LODs are determined to be 131 nM and 122 nM respectively under fluorimetric and colorimetric conditions. Concomitantly, the device exhibits satisfying accuracy and precision for practical applications. Therefore, this newly developed dual-recognition device provides reliable means to detect the presence of AR18, demonstrating promising potential for on-site monitoring and intelligent sensing applications.
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 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）