JOURNAL OF MATERIALS CHEMISTRY
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2012
·Vol. 22
·期 15
·7449-7455
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IF 5.968
Shu-Hui Huo,Xiu-Ping Yan
The adsorption of malachite green from aqueous solution on a highly porous metal–organic framework MIL-100(Fe) was studied in view of the adsorption isotherm, thermodynamics, kinetics, and regeneration of the sorbent. The adsorption isotherms of malachite green on MIL-100(Fe) followed the Freundlich model, and MIL-100(Fe) possessed heterogeneous surface caused by the presence of different functional groups on the surface. The adsorption of malachite green on MIL-100(Fe) is controlled by an entropy effect rather than an enthalpy change, and obeyed a pseudo-second-order kinetics. Analysis of the intraparticle diffusion plots revealed that more than one process affected the adsorption, and film (boundary layer) diffusion controlled the adsorption rate at the beginning. Evidence from zeta potential and X-ray photoelectron spectroscopic data showed that the adsorption of malachite green was also driven by electrostatic attraction and the interaction between the Lewis base –N(CH3)2 in malachite green and the water molecule coordinated metal sites of MIL-100(Fe). MIL-100(Fe) gave much higher adsorption capacity for malachite green than other conventional adsorbents such as activated carbon and natural zeolite. The high adsorption capacity, good solvent stability, and excellent reusability make MIL-100(Fe) attractive for the removal of MG from aqueous solution.
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Journal of Applied Spectroscopy
·
2025
·
IF 1
Xu Jia Jia,Shao Ke Man,Chen Su Yan,Lin Zheng Zhong
A rare earth complex was synthesized using α-thiophenoyltrifluoroacetone and o-phenanthroline as ligands. The complex was characterized by thermogravimetric analysis, infrared spectra, elemental analysis, and X-ray powder diffraction. The fluorescence spectra showed that the complex produced the characteristic fluorescence emission of Eu 3+ ions at 615 nm, highly overlapping with the absorption peak of malachite green to cause fluorescence quenching. Fluorescence lifetime confirmed that the quenching mechanism is a fluorescence resonance energy transfer at low concentration, and fluorescence resonance energy transfer and inner filter effect at high concentration. The complex could exclude the interference of other aquaculture fish drugs and has a specific selectivity for malachite green. Response time was within 1 min, and the linear range was 0.1–70 μmol/L. Detection limit was calculated to be 0.023 μmol/L (3σ/k, n = 9). Spiked recoveries of malachite green in water and fish were in the range of 89.2–98.6%, indicating that the complex could be used as a fluorescent probe for the detection of malachite green residues.
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TALANTA
·
2012
·
IF 3.794
Baomei Huang,Xibin Zhou,Zhonghua Xue,Guofan Wu,Jie Du,Di Luo,Tao Liu,Jing Ru,Xiaoquan Lu
Efficient and stable quenching of electrochemiluminescence of Ru(bpy) 3 2+ /TPA by malachite green(MG) and crystal violet(CV) at the glass carbon (GC) electrode is reported. A novel quenching mechanism has been proposed. Resonance energy transfer from the excited-state luminophore Ru(bpy) 3 2+⁎ to MG/CV and dynamic quenching are suggested as the mechanism for quenching ECL. The quenching mechanism is discussed in detail based on UV–visible absorption spectra, cyclic voltammograms, ECL curves and fluorescence methods . MG shows more efficient quenching than CV. Moreover, the quenched ECL intensity versus the concentration of MG and CV are linear over the concentration ranges of 8×10 −10 –8×10 −7 M and 3.46×10 −9 –5.5×10 −7 M, respectively. The corresponding limit of detection (LOD) was 1.0×10 −10 M for MG and 1.1×10 −10 M for CV ( S / N =3).
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Processes
·
2023
·Vol. 11
·期 5
·1398
·
IF 3.5
Bohan Ai,Mingsheng Luo,Iltaf Khan
Environmental protection laws require effective and green solutions to tackle water and air pollution issues. For this purpose, perovskite photocatalytic materials have proven to be a promising solution. In this study, CsSnBr3perovskite, coupled with ZIF-67 and decorated with noble metal Au, was shown to effectively enhance the charge separation and increase the light-absorbing capacity, and thus make the photocatalytic reaction more efficient by surface plasmon resonance. Characterization results from XRD, FTIR, and UV-visible diffuse reflectance spectroscopy indicated that a mixture of cubic and tetragonal crystalline phases was found in the prepared catalyst material. XPS also revealed that in the presence of two oxidation states for tin (Sn), the Au 4f XPS peaks of Au NPs coincided with those retained in colloidal Au particles. Using malachite green as a model compound, organic pollutant photocatalytic degradation tests proved that CsSnBr3generated good photocatalytic activity for aromatic pollutant degradation. In this research, the synthesized 4Au-7ZIF-CsSnBr3catalyst yielded an MG degradation rate twice as high as the unpromoted CsPbBr3.
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International Journal of Materials Research
·
2022
·Vol. 113
·期 4
·295-305
·
IF 0.678
Yanbing Yin,Hang Yang,Zhaosong Xin,Guopeng Xu,Yang Liu,Guohua Dong,Jie Ma
In this work, a novel MOF (metal organic framework) based composite of β-BCoPc/Cu-BTC is fabricated by immobilizing β-aryloxy phthalocyanine cobalt (β-BCoPc) on Cu-BTC (benzenetricarboxylic acid-Cu) via a facile impregnation approach. After a systematic characterization via X-ray diffraction, X-ray photoelectron spectroscopy, infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and N 2 adsorption–desorption isotherms, the above-synthesized catalyst is for the first time applied to photocatalytically decompose refractory malachite green (MG) dye pollutant under UV light irradiation. In comparison with that of the β-BCoPc or Cu-BTC monomers, the synthesized β-BCoPc/Cu-BTC composite shows a significantly enhanced photocatalytic degradation performance of MG with a best degradation efficiency up to 90.12 %, which can easily be attributed to the synergistic effect between the Cu-BTC and β-BCoPc effectively improving light utilization efficiency, accelerating charge transportation and reducing charge recombination due to the desirable properties such as the conjugacy of the MOFs skeleton, the positive catalytic activity of central ion and large specific surface area, etc. In conclusion, the present work provides an effective and novel strategy via preparing MOF-based composite catalyst to realize the photocatalytic degradation of MG.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Ming Li,Junying Ma,Bingli Pan,Junling Wang
A cage-covalent organic framework (COF)-TP {T = bis(tetraoxacalix[2]arene[2]triazine); P = piperazine}, a novel two-dimensional covalent organic skeleton substituted with a nucleophilic cyanuric chloride analogue, was synthesized by a simple polymerization process. Cage-COF-TP is advantageous owing to its good structural order, permanent porosity, and low preparation cost. This skeleton was employed as a cost-effective adsorbent for the intermittent adsorption of an organic dye from aqueous solutions. Adsorption experiments were carried out at different initial dye concentrations, contact times, and solution pH. The adsorption kinetics followed the pseudo-second order model, and the results of thermodynamic studies were consistent with the Langmuir isotherm model. The high degree of matching between the size and shape of malachite green (MG) and the shrunken channels present in Cage-COF-TP were responsible for the enhanced adsorption ability of this material. Furthermore, theoretical calculations indicated that the high adsorption of the studied adsorbent can be attributed to the presence of nitrogen-rich triazine units in the Cage-COF-TP, which are expected to strengthen its affinity to guest molecules. The obtained results showed that the developed adsorbent is an efficient adsorbent that is theoretically capable of stimulating the removal of ∼2000 mg/g MG from wastewater at ambient temperature. This study will therefore be expected to promote the development of new functional materials based on COFs.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 13
·10594
·
IF 5.6
Zanlin Chen,Haiming Li,Miaojia Xie,Fengguang Zhao,Shuangyan Han
This study proposes a label-free aptamer biosensor for the sensitive detection of malachite green(MG) using gold nanoparticles/multi-walled carbon nanotubes @ titanium dioxide(AuNPs/MWCNTs@TiO2). The nanocomposite provides a large surface area and good electrical conductivity, improving current transfer and acting as a platform for aptamer immobilization. The aptamer and the complementary chain(cDNA) are paired by base complementary to form the recognition element and fixed on the AuNPs by sulfhydryl group, which was modified on the cDNA. Since DNA is negatively charged, the redox probe in the electrolyte is less exposed to the electrode surface under the repulsion of the negative charge, resulting in a low-electrical signal level. When MG is present, the aptamer is detached from the cDNA and binds to MG, the DNA on the electrode surface is reduced, and the rejection of the redox probe is weakened, which leads to an enhanced electrical signal and enables the detection of MG concentration by measuring the change in the electrical signal. Under the best experimental conditions, the sensor demonstrates a good linear relationship for the detection of MG from 0.01 to 1000 ng/mL, the limit of detection (LOD)is 8.68 pg/mL. This sensor is stable, specific, and reproducible, allowing for the detection of various small-molecule pollutants by changing the aptamer, providing an effective method for detecting small-molecule pollutants.Keywords:aptamer;cyclic voltammetry;potassium hexacyanoferrate;sensitive detection;differential pulse voltammetry
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CHEMOSPHERE
·
2023
·
IF 8.8
Xueqing Wang,Xing Liu,Fan Li,Chiara Valsecchi,Zhangmei Hu,Yongzheng Zhang,Dongmei Wang,Chaoming Wang,Ji Sun,Meikun Fan
This work presents a novel strategy for the synthesis of a recyclable aerogel and its multifunctional application as effective adsorption material for organic pollutants and as a high-quality SERS substrate for on-site detection measurement. Silver nanoparticles (Ag NPs) were uniformly dispersed and adsorbed on the surface of an Fe 3 C-loaded carbon aerogel, resulting in the formation of a three-dimensional Ag–Fe 3 C–MCA (magnetic carbon aerogel) composite. The substrate preparation led to Ag–Fe 3 C–MCA with a mesoporous structure for high adsorption capacity, together with magnetic properties for easy separation capability. The Ag–Fe 3 C–MCA composite demonstrated an efficient removal ability for malachite green (MG), with an adsorption capacity of 296.7 mg g −1 . Moreover, Ag–Fe 3 C–MCA composite provided ultrasensitive surface-enhanced Raman scattering detection for MG molecules, obtaining a limit of detection (LOD) of 3 × 10 −10 M. Aquaculture water samples with spiked MG concentrations were used to simulate practical scenarios. The Ag–Fe 3 C–MCA presented has a significant potential for the removal of hazardous residues in wastewater, together with an efficient and sensitive method of quantification, all on the same substrate.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2022
·Vol. 26
·期 10
·2231-2246
·
IF 2.747
Wang Li,Wang Junbo,Yu Aishui,Yu Zuolong
In this paper, removal of malachite green (MG) by two separate processes, namely electrochemical oxidization polymerization and electrochemical reduction precipitation process, was studied. Reaction rate constants ( k 0 ), exchange current density i 0 , the transfer coefficients β and the diffusion coefficient D values were all tested. TR-FTIR (time-resolved Fourier transform infrared spectroscopy), UPLC-MS (ultra-performance liquid chromatography–mass spectrometry), and GC–MS (gas chromatography–mass spectrometer) analyses were applied to investigate the pathway and mechanism of MG degradation. The results show that both electrochemical oxidization polymerization and electrochemical reduction precipitation process were efficient to remove MG.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Zi-Bo Ma,Yan Zhang,Xing-Hui Ren,Xi-Wen He,Wen-You Li,Yu-Kui Zhang
The proposition of ratiometric detection mode has demonstrated great superiority in improving analysis accuracy by forming self-calibration. Herein, the novel dual-reverse-signal ratiometric fluorescence detection for malachite green (MG) was first achieved based on synergistic effect of fluorescence resonance energy transfer (FRET) and inner filter effect (IFE). The ratiometric fluorescence probe (B-RCDs) was self-assembled via electrostatic attraction between blue-emission carbon dots (BCDs) and red-emission carbon dots (RCDs), followed with FRET effect from BCDs to RCDs and exhibited dual-emission at 450 nm and 627 nm. In the presence of MG, the IFE effect between MG and RCDs quenched the fluorescence at 627 nm and restored the fluorescence at 450 nm, sending out two reverse signals along with an obvious color change from pink to purple (302 nm UV lamp). This ratiometric method not only simplified the preparation process, but also improved the detection sensitivity, showing a low limit of detection (LOD) of 41.8 nM, which exhibited superiority than that of single-signal RCDs (157.3 nM). This method held a rapid response of 10 min and represented satisfactory recoveries (99.14%−109.08%) in real water samples, revealing it was a promising candidate in the fast, sensitive and practical detection of MG. Moreover, the design of synergistic effect supplied a new perspective for the development of ratiometric sensing in the future.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Boyu Du,Lanfang Chai,Yumeng Wang,Xing Wang,Xiaohong Chen,Jinghui Zhou,Run-Cang Sun
Recently, the research on low-cost and renewable lignin-based adsorbent for the effective removal of organic dyes from wastewater has attracted great interest. Herein, a demethylated lignin-based micro-particle (DLMP) adsorbent with high hydroxyl content was prepared by using AlCl 3 as modification reagent, which exhibited an excellent adsorption capacity for malachite green (MG). The results showed that the size distribution of DLMP was about 100–500 nm, the surface area reached 17.35 m 2 /g, and the phenolic hydroxyl (Ar-OH) group content was up to 5.77 mmol/g, which was much better than that of originally organosolv lignin (OL). With this DLMP as the lignin-based adsorbent, all adsorption processes fitted well with the Langmuir isothermal and the Pseudo-second-order kinetic models. The maximum adsorption capacity for MG reached 168.24 mg/g, which was higher than most of the previously published biomass-based adsorbents. Simultaneously, DLMP adsorbent could be easily regenerated, obtaining outstanding recyclability. After eight cycles, the adsorption capacity of DLMP retained at 144.59 mg/g. Finally, the investigation of the possible adsorption mechanism suggested that the synergistic interactions of electrostatic force, hydrogen bonding, π-π stacking and the superior micro-size structure significantly improved the adsorption property. In conclusion, DLMP adsorbent displays a high adsorption capacity and an excellent recyclability for the removal of MG, which might have widespread prospect in the low-cost and renewable biomass-based adsorbent.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Boyu Du,Yumeng Wang,Qian Zheng,Xing Wang,Xiaohong Chen,Jinghui Zhou,Guihua Yang,Run-Cang Sun
The development of eco-friendliness and cost-effectiveness featured lignin-based adsorbents is of great interest for the removal of organic dyes and heavy metal ions. In this work, lignin was modified by 5-sulfosalicylic acid using epichlorohydrin and formaldehyde as across-linking agents. Then the prepared lignin product (C-SAL) was applied as an adsorbent for the malachite green (MG) and Pb 2+ ions, and the adsorption performances were investigated in detail via a series of experiments. The isotherm and kinetic models indicated that the chem-adsorption for both MG and Pb 2+ ions occurred in monolayer, and the thermodynamic models displayed that all processes were endothermic and spontaneous. Based on the calculation, the maximum adsorption capacities (Q max ) of C-SAL could achieve 203.45 and 115.67 mg/g for MG and Pb 2+ ions, respectively, which are superior to many other biomass-based adsorbents. Besides, 94.52 % and 88.27 % of initial adsorption capacities could be retained after eight cycles for MG and Pb 2+ ions, respectively. Additionally, the adsorption mechanism was also comprehensively investigated by the structural change characterizations, MESP analysis and DFT calculations. The results showed that the adsorption for MG molecules took place through electrostatic, hydrogen bonding and π-π interactions, while that for Pb 2+ ions was attributed to the synergistic effect of complexation, hydrogen bonding and electrostatic interactions. In summary, C-SAL has the advantages of satisfied adsorption capacity and good recyclability, which can provide a low-cost and high-efficiency way for adsorptions of pollutants in practical applications.
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