Biosensors-Basel
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2023
·Vol. 13
·期 8
·766
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IF 5.4
Xiaoxiao Zhou,Shouhui Chen,Yi Pan,Yuanfeng Wang,Naifeng Xu,Yanwen Xue,Xinlin Wei,Ying Lu
In order to improve the detection performance of surface-enhanced Raman scattering (SERS), a low-cost Au@Ag nanorods (Au@Ag NRs) substrate with a good SERS enhancement effect was developed and applied to the detection of malachite green (MG) in aquaculture water and crayfish. By comparing the SERS signal enhancement effect of five kinds of Au@Ag NRs substrates with different silver layer thickness on 4-mercaptobenzoic acid (4-MBA) solution, it was found that the substrate prepared with 100 µL AgNO3had the smallest aspect ratio (3.27) and the thickest Ag layer (4.1 nm). However, it showed a good signal enhancement effect, and achieved a detection of 4-MBA as low as 1 × 10−11M, which was 8.7 times higher than that of the AuNRs substrate. In addition, the Au@Ag NRs substrate developed in this study was used for SRES detection of MG in crayfish; its detection limit was 1.58 × 10−9M. The developed Au@Ag NRs sensor had the advantages of stable SERS signal, uniform size and low cost, which provided a new tool for SERS signal enhancement and highly sensitive SERS detection method development.Keywords:Au@Ag nanorods substrate;surface-enhanced Raman scattering (SERS);malachite green
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Xin Hong,Ruojun Mu,Ting Lin,Liping Dao,Shuyi Wu,Zhiming Yan,Jie Pang
Konjac glucomannan/zeolitic imidazole framework-67 (KGM/ZIF-67) hybrid aerogels were prepared as novel adsorbents to remove malachite green (MG) from aqueous solutions. The impacts of adsorption temperature, solution pH, and ionic strength on adsorption capacity were investigated. The results show that ZIF-67 coordinates with the molecular chain of KGM and modifies the KGM aerogel. The adsorption equilibrium time of KZ2 for MG is 150 min. The adsorption process follows the pseudo-second-order and Langmuir models, with a maximum adsorption capacity of 2891.30 mg·g −1 at 30 ℃. MG adsorption using the hybrid aerogels is a spontaneous and endothermic process. This research shows that hybrid aerogels prepared using KGM and ZIF-67 are promising for use in new water purification applications.
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JOURNAL OF MOLECULAR STRUCTURE
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2022
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IF 3.841
Minwen Jiang,Ligang Chen,Na Niu
Herein, a novel kind of magnetic amino-modified lignin (MAL) sorbents was designed through a facile strategy based on Mannich reaction, which was used for removing a typical aquatic pollutant malachite green (MG). During the synthesis procedure, the 3-amino-propyltriethoxysilane was used as the cross-linker between aminated lignin and magnetic nanoparticles. The physical and chemical structure of MAL were investigated through a series of characterization methods including FTIR, XRD, TGA, SEM, and XPS. The effect of pH shows that the adsorbent has excellent adsorption performance for MG at pH=7. According to the adsorption data, the adsorption process was in line with the Langmuir model and the pseudo-second-order model, indicating that the adsorption was monolayer adsorption and chemisorption. MAL showed excellent sorption capacity of 456.62 mg/g and high adsorption speed within 35 min. Thermodynamic studies show that the adsorption is exothermic and spontaneous. Meanwhile, MAL shows good magnetic properties with the saturation magnetization intensities of 22.61 emu/g. In addition, the MAL could be easily recovered and reused at least five times, which performed good reusability. The mechanism of MG capture onto MAL can be mainly attributed to electrostatic attraction, hydrogen bonding, and π-π stacking. In a word, the as-prepared MAL showed great potential for wastewater treatment due to its excellent adsorption efficiency, environmental friendliness, and superparamagnetic behavior.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Xuelun Zhang,Chongpeng Qiu,Feng Li,Xuefeng Zhang,Mei-Chun Li,Jiulong Xie,Cornelis F. de Hoop,Jinqiu Qi,Xingyan Huang
Herein, a novel magnetic adsorbent (BC/AA/MN@Fe 3 O 4 ) was successfully prepared from waste bamboo fiber tissue and montmorillonite, and subsequently applied for the highly selective removal of malachite green (MG, removal efficiency = 97.3 %) from the mixed dye solution of MG with methyl orange (MO, removal efficiency = 4.5 %). The magnetic adsorbent has a high porosity with abundant mesopores. In the single dye MG solution, the adsorbent could effectively remove MG over a wide pH range from 4 to 10, and the maximum adsorption capacity ( q max ) was 2282.3 mg/g. Moreover, the magnetic adsorbent could remove MG from various solutions including mixed dye solution, high salinity solution, and real river water dye solution. The thermodynamic results proved that the adsorption process of MG was spontaneous and endothermic. The adsorption of MG was due to the comprehensive effects of electrostatic attraction, hydrogen bonding interactions and ions exchange, between the adsorbent and MG. Furthermore, the BC/AA/MN@Fe 3 O 4 exhibited an excellent reusability with adsorption efficiency above 53.4 % after five consecutive cycles. Therefore, the prepared magnetic nanocellulose-based adsorbent was expected to be a promising material for highly selective adsorption and separation of MG from mixed dye solution.
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JOURNAL OF CHEMICAL SCIENCES
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2021
·Vol. 133
·期 2
·1-8
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IF 1.573
Fu Guiyu,Weng Huanyuan,Lai Zhuzhi,Lin Zhengzhong,Huang Zhiyong
A rare earth complex Eu(MAA) 3 Phen was prepared with methacrylic acid and o -phenanthroline as ligands under mild conditions. The complex has a fluorescence emission centered at 618 nm with a half-peak width of 15 nm. Since the emission peak of the complex matches the absorption peak of malachite green (MG), the fluorescence of the complex will be quenched by MG through the fluorescence resonance energy transfer effect. The fluorescence testing conditions for MG were optimized based on fluorescence intensity and fluorescence quenching efficiency. The FRET efficiency was calculated to be 0.21. Under the optimal conditions, the response time was only 5 min. Compared with sulfonamides, chloramphenicol and other banned fishery drugs, the complex exhibited the highest quenching efficiency to MG. The linear range was 0.5–20 μmol L −1 , and the detection limit was 117.29 nmol L −1 (3σ/S, n = 9). This complex was used to detect MG residue in aquaculture water, and the recoveries were between 96.10% and 98.76%, indicating that the prepared fluorescent probe could be used for the rapid detection of MG in aquaculture water. Graphical abstract
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FOOD CHEMISTRY
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2021
·
IF 7.514
Xiaoyue Yue,Yan Li,Sheng Xu,Junguang Li,Min Li,Liying Jiang,Mingsha Jie,Yanhong Bai
Developing intelligent, sensitive, and visual methods for rapidly detecting veterinary drug residues is essential for ensuring food quality and safety. A portable smartphone-assisted ratiometric fluorescent sensor was successfully designed using fluorescent Al-MOF nanosheet and rhodamine B (RhB) as fluorescent probes to adjust to the requirement of malachite green (MG) detection. The developed ratiometric fluorescent sensor allowed sensitive and selective detection of MG with good linear relationships in a wide range of 0.5–200 μg/mL. The Quantitative linear range is 5.3 μg/mL to 200 μg/mL. The limit of detection (LOD) and limit of quantification (LOQ) were calculated to be 1.6 μg/mL and 5.3 μg/mL respectively. The practicability of the proposed method was verified using high performance liquid chromatography (HPLC) in spiked fish tissues with satisfying recoveries and RSD. Moreover, portable smartphone-assisted fluorescent test papers were fabricated for the intelligent detection of MG. This integration of smartphones and fluorescent test papers was economical and saved time, providing an alternative strategy for the qualitative discernment and semi-quantitative analysis of MG on-site.
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INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
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2019
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IF 1.426
Zheng-zhong Lin,Wen-Jing Li,Qing-Chou Chen,Ai-hong Peng,Zhi-yong Huang
A fluorescent probe based on CdTe/CdS quantum dots coated with molecularly imprinted polymer shell was designed. The fluorescence emission of the probe was at 622 nm. The probe presented selective adsorption for malachite green and the adsorption caused fluorescence quenching due to fluorescence resonance energy transfer. A linear relationship ranging from 0.05 to 10 μmol·L−1 between relative fluorescence quenching intensities and malachite green concentrations was obtained with a detection limit of 0.029 μmol·L−1. The fluorescent probe was successfully applied to the determination of malachite green in fish with recoveries ranging from 93.3 to 107.7%.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Yan Jun Ju,Na Li,Shi Gang Liu,Lei Han,Na Xiao,Hong Qun Luo,Nian Bing Li
The ratiometric fluorescence measurement has drawn great attention due to its selective and sensitive sensing property for numerous analytes. In this sensing system, a ratiometric fluorescence method is described for the determination of malachite green (MG) based on bovine serum albumin-stabilized Au nanoclusters (BSA-AuNCs) with dual emission. The as-prepared BSA-AuNCs exhibit two emission peaks around 430 and 610 nm under a single excitation, which may be from the intrinsic structure of BSA and AuNCs, respectively. As MG was added, the fluorescence at 610 nm was obviously quenched, and the fluorescence intensity at 430 nm decreased slowly, which might be mainly ascribed to fluorescence resonance energy transfer and dynamic quenching. The fluorescence intensity ratio of F 430 / F 610 shows good linearity for detecting MG in the 0.3–20 μM range with a low detection limit of 0.19 μM. In addition, the ratiometric sensing strategy is successfully applied to real water samples, which reveals its potential practicability for detecting MG in environmental water samples.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2014
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IF 3.552
Xiaomei Zhang,Hongwen Yu,Hongjun Yang,Yuchun Wan,Hong Hu,Zhuang Zhai,Jieming Qin
A simple sol–gel method using non-toxic and cost-effective precursors has been developed to prepare graphene oxide (GO)/cellulose bead (GOCB) composites for removal of dye pollutants. Taking advantage of the combined benefits of GO and cellulose , the prepared GOCB composites exhibit excellent removal efficiency towards malachite green (>96%) and can be reused for over 5 times through simple filtration method. The high-decontamination performance of the GOCB system is strongly dependent on encapsulation amount of GO, temperature and pH value. In addition, the adsorption behavior of this new adsorbent fits well with the Langmuir isotherm and pseudo-second-order kinetic model.
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JOURNAL OF FLUORESCENCE
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2015
·Vol. 25
·期 5
·1397-1402
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IF 1.927
Cao Yujuan,Wei Jiongling,Wu Wei,Wang Song,Hu Xiaogang,Yu Ying
In the present work, the CdTe quantum dots were covalently conjugated with permethylated- β -cyclodextrin (OMe- β -CD) using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride as cross-linking reagent. The obtained functional quantum dots (OMe- β -CD/QDs) showed highly luminescent, water solubility and photostability as well as good inclusion ability to malachite green. A sensitive fluorescence method was developed for the analysis of malachite green in different samples. The good linearity was 2.0 × 10 −7 –1.0 × 10 −5 mol/L and the limit of detect was 1.7 × 10 −8 mol/L. The recoveries for three environmental water samples were 92.0–108.2 % with relative standard deviation (RSD) of 0.24–1.87 %, while the recovery for the fish sample was 94.3 % with RSD of 1.04 %. The results showed that the present method was sensitive and convenient to determine malachite green in complex samples.
The analytical mechanism of OMe-β-CD/QDs and its linear response to MG
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REACTIVE & FUNCTIONAL POLYMERS
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2015
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IF 2.515
Zheng-zhong Lin,Hong-yuan Zhang,Lu Li,Zhi-yong Huang
Magnetic molecularly imprinted polymers (MMIPs) synthesized through suspension polymerization were used as the adsorbent for the detection of malachite green (MG) in fish samples. The morphological, thermal and magnetic properties of the MMIPs were characterized. The influence of polymerization condition on the absorption capacity of the MMIPs for MG was explored. The results gave the optimum polymerization condition as follows: using MG (0.25 mmol) as template, methacrylic acid (1 mmol) as monomer , ethylene dimethacrylate (5 mmol) as cross linker, 2,2′-Azobis(2-methylpropionitrile) (100 mg) as initiator, Fe 3 O 4 (100 mg) as magnetic nuclei, and PVA (1%) as dispersant . Under the optimum condition the apparent maximum adsorption capacity of MMIPs is 5693 μg·g − 1 with dissociation constant being 23.5 mg·L − 1 . The MMIPs also have strong magnetic responses to an external magnet, which enable the rapid separation from the sample solution. The MMIPs were employed for the detection of MG residue in fish samples combined with HPLC . The recoveries of spiked MG in fish samples ranged from 82.7% to 111% with RSD in the range of 2.0%–12.8%. The MMIPs can retain 90% of the original adsorption capacity even if used for 5 times. Thus, the prepared MMIPs can be applied to the sample pretreatment for separation and enrichment of MG residue in fish samples.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
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IF 2.714
Zhennan Shi,Chen Xu,Han Guan,Ling Li,Lu Fan,Yingxi Wang,Li Liu,Qingtao Meng,Run Zhang
We designed and synthesized a magnetic metal organic frameworks (MOFs) composite, Cu-MOFs/Fe 3 O 4 as the adsorbent for removal of lead (Pb(II)) and malachite green (MG) in wastewater. This Cu-MOFs/Fe 3 O 4 can be easily prepared by in-situ growth of Cu-MOFs with doping Fe 3 O 4 nanoparticles . The prepared Cu-MOFs/Fe 3 O 4 composite was well characterized by SEM , XRD , and FTIR spectra. The adsorption experiments found that Cu-MOFs/Fe 3 O 4 can serve as adsorbent for removal of Pb(II) and MG simultaneously. The adsorption capacities were found to be 113.67 mg/g for MG and 219.00 mg/g for Pb 2+ , respectively, which are significantly higher than reported materials. Adsorption isotherm , kinetics and recyclability of Cu-MOFs/Fe 3 O 4 for removal of Pb(II) and MG were then studied. Adsorption of Pb(II) and MG exhibited Freundlich adsorption isotherm model, with the adsorption kinetics of available second-order kinetic. Physical adsorption for MG and chemical adsorption for Pb(II) were confirmed by Dubinin-Radushkevich (D-R) isothermal adsorption model. The adsorption of Pb(II) and MG in real water samples were then studied. The Fe 3 O 4 /Cu-MOFs was found to be recyclable for removal of Pb(II) and MG, can be explored as the potential adsorbent for waste water treatment.
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