Polymers
·
2017
·Vol. 9
·期 8
·344
·
IF 3.364
Weixin Liang,Huawen Hu,Pengran Guo,Yanfang Ma,Peiying Li,Wenrou Zheng,Min Zhang
Malachite green (MG) is currently posing a carcinogenic threat to the safety of human lives; therefore, it is highly desirable to develop an effective method for fast trace detection of MG. Herein, for the first time, this paper presents a systematic study on polymer microspheres, being prepared by combined Pickering emulsion polymerization and molecular imprinting, to detect and purify MG. The microspheres, molecularly imprinted with MG, show enhanced adsorption selectivity to MG, despite a somewhat lowered adsorption capacity, as compared to the counterpart without molecular imprinting. Structural features and adsorption performance of these microspheres are elucidated by different characterizations and kinetic and thermodynamic analyses. The surface of the molecularly imprinted polymer microspheres (M-PMs) exhibits regular pores of uniform pore size distribution, endowing M-PMs with impressive adsorption selectivity to MG. In contrast, the microspheres without molecular imprinting show a larger average particle diameter and an uneven porous surface (with roughness and a large pore size), causing a lower adsorption selectivity to MG despite a higher adsorption capacity. Various adsorption conditions are investigated, such as pH and initial concentration of the solution with MG, for optimizing the adsorption performance of M-PMs in selectively tackling MG. The adsorption kinetics and thermodynamics are deeply discussed and analyzed, so as to provide a full picture of the adsorption behaviors of the polymer microspheres with and without the molecular imprinting. Significantly, M-PMs show promising solid-phase extraction column applications for recovering MG in a continuous extraction manner.Keywords:pickering emulsion polymerization;molecular imprinting;molecularly imprinted polymer microspheres;specific adsorption;solid-phase extraction column
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Foods
·
2024
·Vol. 13
·期 17
·2855
·
IF 4.7
Yue Zhou,Yuanyuan Jiang,Xiangyu Chen,Hongchen Long,Mao Zhang,Zili Tang,Yufang He,Lei Zhang,Tao Le
The ratiometric fluorescent probe UiO-OH@Tb, a zirconium-based MOF functionalized with Tb3+, was synthesized using a hydrothermal method. This probe employs the fluorescence resonance energy transfer (FRET) mechanism between Tb3+and malachite green (MG) for the double-inverse signal ratiometric fluorescence detection of MG. The probe’s color shifts from lime green to blue with an increasing concentration of MG. In contrast, the monometallic MOFs’ (UiO-OH) probe shows only blue fluorescence quenching due to the inner filter effect (IFE) after interacting with MG. Additionally, the composite fluorescent probe (UiO-OH@Tb) exhibits superior sensitivity, with a detection limit (LOD) of 0.19 μM, which is significantly lower than that of the monometallic MOFs (25 μM). Moreover, the content of MG can be detected on-site (LOD = 0.94 μM) using the RGB function of smartphones. Hence, the UiO-OH@Tb probe is proven to be an ideal material for MG detection, demonstrating significant practical value in real-world applications.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
·
IF 4.3
Jin-Yu Zhou,Jian Zhu,Guo-Jun Weng,Jian-Jun Li,Jun-Wu Zhao
A novel surface-enhanced Raman scattering (SERS) composite substrates on the basis of Ag triangular nanoplates(Ag TNPs)-modified SiO 2 photonic crystals (PC) is fabricated and applied to the SERS detection of malachite green (MG). It consists of uniformly arranged Ag TNP@SiO 2 , a new PC. Notably, Ag TNP are uniformly aligned on the SiO 2 surface, forming a three-dimensional high-density hotspot nanostructure. With the tip “hot spots” of Ag TNPs, Bragg diffraction of SiO 2 and coupling enhancement between Ag TNPs and SiO 2 , the SERS enhancement of this composite substrates was multiplied. The effect on the SERS of Ag TNP@SiO 2 composite substrate was systematically optimized by tuning Ag TNP size, size of SiO 2 microspheres, coverage of Ag TNPs on SiO 2 and fabrication method of Ag TNPs and PC. Moreover, the uniform of SERS composite substrates and Raman signal was dramatically increased by the method of vertical deposition. Eventually, the SERS composite substrates were employed in MG detection. Its broad detection range of 1 pM–1 μM and low limit of detection (LOD) of 0.49 pM indicated acceptable sensitivity and repeatability. This work illustrates the promising applicability in food safety analysis based on SERS composite substrates composed by Ag TNP@SiO 2 with numerous SERS enhancements and excellent stability.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·Vol. 39
·期 1
·e7942
·
IF 3.7
Di Su,Wen Xu,Dongbin Yang,Jiandu Lei,Jing Liu,Chunping Chen,Dermot O'Hare
As a renewable new material with high void ratio, large adsorption surface area, and high adsorption rate, biomass carbon (BC) is a promising adsorbent, which has received wide attention for the degradation of dyes. However, physical adsorption cannot completely remove dyes, and there is also the risk of secondary pollution. ZnAl-layered double hydroxide (ZnAl-LDH) is a semiconductor photocatalyst with abundant active sites and excellent degradation efficiency. In this paper, we have designed a ZnAl-layered double oxide@biomass carbon (ZnAl-LDO@BC) formed by in situ grown LDH on the waste poplar wood as a synergistic adsorption and photocatalytic system. BC as a support could enhance the dispersity of layered double oxide (LDO), whereas LDO could provide photodegradation function to BC. Our studies indicate that the prepared ZnAl-LDO@BC presents lower bandgap energy, higher surface area, and lower complexation efficiency of holes and electrons than delignified biomass (DB). As a result, ZnAl-LDO@BC increased the removal rate of malachite green (MG) to 85.8%, which is 3.5 times higher than DB. The maximum removal rate was close to 98%, and the removal capacity was 1954 mg g −1 under an initial concentration of 200 mg L −1 of MG dye, and the possible mechanism of MG degradation was also investigated. In this study, the conversion of agroforestry wastes into high-value materials applied to dye degradation provides a new pathway for the production of stable, sustainable, and superior photocatalytic material.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
·
IF 4.3
Tianxing Fang,Qingyi Wei,Erwen Wu,Hongbin Pu
Malachite green (MG)-contaminated aquatic products pose a serious threat to animal and human health. Hence, a novel recyclable surface-enhanced Raman scattering (SERS) substrate based on AuNPs/TiO 2 /Ti 3 C 2 heterostructures was developed for the detection and degradation of MG in aquatic products. Specifically, AuNPs/TiO 2 /Ti 3 C 2 heterostructures were synthesized by in situ oxidation and electrostatic adsorption based on Ti 3 C 2 nanosheets. The excellent photocatalytic and SERS performance of the AuNPs/TiO 2 /Ti 3 C 2 was demonstrated by Density functional theory (DFT) calculations and experimental results, which was attributed to the enhancement of charge transfer (CT) after the formation of heterostructures. The results demonstrate that AuNPs/TiO 2 /Ti 3 C 2 is highly sensitive and recyclable. The detection limit of the sensor for MG is 8.91 × 10 −5 mg/L. The sensor can be recycled for five times under the condition of light, and shows satisfactory self-cleaning performance in the food matrix, providing a possible alternative solution for the recyclable detection of MG.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Xiaoqing Wang,Shangkun Liu,Shaolei Chen,Xubin He,Wenjing Duan,Siyuan Wang,Junzi Zhao,Liangquan Zhang,Qing Chen,Chunhua Xiong
Given the necessity and urgency in removing organic pollutants such as malachite green (MG) from the environment, it is vital to screen high-capacity adsorbents using artificial neural network (ANN) methods quickly and accurately. In this study, a series of ZIF-67 were synthesized, which adsorption properties for organic pollutants, especially MG, were systematically evaluated and determined as 241.720 mg g −1 (25 ℃, 2 h). The adsorption process was more consistent with pseudo-second-order kinetics and Langmuir adsorption isotherm , which correlation coefficients were 0.995 and 0.997, respectively. The chemisorption mechanism was considered to be π-π stacking interaction between imidazole and aromatic ring. Then, a Python-based neural network model using the Limited-memory BFGS algorithm was constructed by collecting the crucial structural parameters of ZIF-67 and the experimental data of batch adsorption. The model, optimized extensively, outperformed similar Matlab-based ANN with a coefficient of determination of 0.9882 and mean square error of 0.0009 in predicting ZIF-67 adsorption of MG. Furthermore, the model demonstrated a good generalization ability in the predictive training of other organic pollutants. In brief, ANN was successfully separated from the Matlab platform, providing a robust framework for high-precision prediction of organic pollutants and guiding the synthesis of adsorbents.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Qingyun Liu,Boxuan Peng,Jiahui Li,Fangzheng Zhao,Enchang Liu,Huizhen Han,Tong Wu,Jinfeng Xing
To overcome the inherent mechanical limitations of polysaccharide hydrogels for dye adsorption, we developed dual-network hydrogel microspheres via efficient one-step droplet photopolymerization initiated by green LED. The primary network was photopolymerized from sodium acrylate monomers and ethylene glycol dimethacrylate cross-linker, while the secondary network formed through Schiff base conjugation between oxidized chondroitin sulfate and carboxymethyl chitosan. Systematic characterization (FTIR, TGA, SEM, XPS) confirmed the hydrogels' structural and thermal properties. Key operational parameters including contact time, temperature, initial MG concentration, pH, and ionic strength were optimized. At room temperature, adsorption equilibrium was achieved within 3 h, following pseudo-second-order kinetics. The adsorption capacity is 806.51 mg/g and fitted the Langmuir isotherm model. Electrostatic interactions dominated the adsorption mechanism, as verified by pH and ionic strength experiments. After five adsorption-desorption cycles, MG removal efficiency remained more than 80 %.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Bingzhi Liu,Haitao Lu,Shenyu Wu,Zizeng Wang,Li Feng,Huaili Zheng
Conventional flocculants are difficult to effectively remove dissolved ions and organic matter from water. This work aims to develop an environmentally friendly and renewable core–shell type flocculant (MCHS-g-P(AM-IA)) with octopus tentacle-like strong adsorption structure. The organic shell hydrolyses into molecular chains like octopus tentacles and adsorb dissolved ions/organic macromolecules through suckers-like functional groups, while the magnetic core acts as the growth center of flocs. Configuration and physical/chemical properties of the flocculant were analyzed by a series of characterization methods. Set Cu(II) and malachite green (MG) as models of heavy metal and organic pollutants separately, the removal capacity of MCHS-g-P(AM-IA) for water contaminants was studied in single-contaminant system and binary-contaminant system. The flocculation behavior and mechanism of MCHS-g-P(AM-IA) were deeply investigated by analysis of pH-dependence, background cationic influence and flocculation kinetics and SEM-EDS/XPS analysis of flocs. Furthermore, the flocculation performance in actual water matrix and regeneration tests of MCHS-g-P(AM-IA) were carried out to evaluate the applicable feasibility of flocculants for purification of complex wastewater in single stage water treatment.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Nuo Duan,Xiaowan Chen,Xianfeng Lin,Dichen Ying,Zhouping Wang,Wenbo Yuan,Shijia Wu
Herein, a paper-based fluorescence sensor based on the metal-organic frameworks capped with aptamer and molecular imprinted polymer ( [email protected] ) was designed for malachite green (MG) and realized sensitive detection by using digital image colorimetry with the aid of smartphone. The green fluorescence terbium MOF-76 was prepared and used as a carrier to conjugate with MG specific aptamer. MG, as template molecule, was subsequently added into MOF-Apt to generate MIP layer under the action of co-polymerization process. With the addition of MG, the fluorescence of [email protected] was quenched because MG was synergistically bound with aptamer and MIP and induced photo-induced electron transfer (PET) effect. Then, the obtained [email protected] probe was applied to a circle pattern paper and measured by a smartphone, in which color recognition software was installed to read out the RGB values of the acquired images. The detection limit for paper-based detection was 0.1 ng/mL. This point of care testing (POCT) method was applied to detect MG in fish and water samples with recoveries in 94.0–105.6 %. This method endows synergistic binding effect of aptamer and MIP, enhancing the detection sensitivity and specificity, and the paper-based detection with smartphone facilitate the on-site monitoring. It is expected that this sensor will be of great significance for the detection and monitoring of illegal additive in food stuffs.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 24
·52347
·
IF 3.057
Chunyan Lei,Qian Xiao,Shanshan Zhou,Weihao Zu,Jialin Li,Jun Zeng,Lulan Yan,Yuewen Huang,Bin Wang
A new type of magnetic hydrogel (Fe 3 O 4 /CMC-co-p[AA-IA]) adsorbent was synthesized using magnetic carboxymethyl chitosan (CMC) matrix with acrylic acid and itaconic acid monomers by radical graft copolymerization and it was applied to the adsorption of malachite green (MG) aqueous solution. The chemical structural characteristics of hydrogel adsorbent were characterized by Fourier transform infrared spectra (FT-IR), scanning electrons microscope (SEM), thermogravimetric analysis (TGA), vibrating sample magnetometer (VSM), and X-ray diffraction (XRD). These characteristics revealed that acrylic acid and itaconic acid monomers were successfully grafted onto the CMC backbone. Hydrogel adsorbent in deionized water has an excellent swelling ratio. To optimize the effect of various factors including pH, adsorbent dosage, ionic strengthen, initial concentration, contact time, and temperature on the adsorption capacity of MG dye were investigated in a batch. The adsorption equilibrium in the adsorption process follows the Langmuir isotherm adsorption and belongs to the monolayer adsorption. For describing the adsorption kinetics of MG dye, the pseudo-second-order kinetic model is more suitable appropriately than the pseudo-first kinetic model. The thermodynamics model shows that the adsorption process is endothermic and spontaneous. After five cycles of adsorption and desorption, the hydrogel adsorbent also has better adsorption efficiency. These results show that the adsorbent has a better swelling capacity and a better adsorption performance.
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MARINE POLLUTION BULLETIN
·
2020
·
IF 4.049
Min Zhao,Zonghao Hou,Ziru Lian,Dan Qin,Changzi Ge
This research describes the application of magnetic molecularly imprinted nano-sized polymers (MMIPs) for the selective extraction and fast detection of malachite green (MG) from marine sediment samples followed by UV–Vis spectrophotometry . The novel material was prepared by surface imprinting using methacrylic acid as the functional monomer for fixing the template molecules. The polymers obtained at each step were thoroughly studied by transmission electron microscopy , FTIR spectroscopy and thermogravimetric analysis . Simultaneously, the adsorption performances of the resulting nanoparticles were analysed in detail and an excellent affinity with the MG was revealed. Further, the main parameters of magnetic molecular imprinted solid-phase extraction (MMIP-SPE) were screened via multivariate optimization methods. The magnetic nanoparticles were used as special adsorbents to directly extract MG from crude marine sediment extracts. The developed method exhibits satisfactory recoveries from the spiked samples, ranging from 80.40 to 92.96% with an RSD of less than 5.18% (n = 3).
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2020
·
IF 4.966
Lujian Lin,Shuai Tang,Xuesong Wang,Xuan Sun,Anqi Yu
Nylon microplastics and malachite green (MG) coexist ubiquitously in the coastal aquaculture areas. Factors controlling MG adsorption to aged and virgin nylon microplastics were identified. The microplastics were characterized by scanning electron microscope equipped with the energy dispersive X-ray spectroscope (SEM-EDAX) and Fourier transform-infrared (FTIR) spectroscopy to elucidate the possible interaction mechanism. The MG adsorption closely conformed to the pseudo-second-order model and the Langmuir isotherm. The MG uptake by the aged nylon microplastics significantly decreased with an increase in solution Pb 2+ concentration while the effect of Pb 2+ on MG uptake by the virgin microplastics was negligible. The optimum conditions for MG uptake by aged nylon microplastics obtained were 33.51 mg g −1 at initial MG concentration of 57 mg L −1 , initial solution pH of 6.84 and aged nylon microplastics dosage of 1.66 g L −1 by use of response surface methodology (RSM). Desorption efficiencies (%) of MG/nylon microplastics combinations in gut surfactant were significantly higher than those in the water, which indicates MG with nylon microplastics has the higher potential for transport to organisms. Overall, the results of this study highlight the role of surface carboxyl functional groups and H-bonding, which both jointly regulate the adsorption of MG on aged nylon microplastics.
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