MOLECULES
·
2025
·Vol. 30
·期 3
·466
·
IF 4.6
Xianlu Lei,Shuang Li,Jian Zeng,Meiqi Huang,Miaomiao Ma,Xueyan Ran,Xiang Chen,Yuting Yin,Qi Sun,Tao Le
Zinc oxide (ZnO) semiconductors are renowned for their cost-effective synthesis and superior catalytic attributes, making them prominent in environmental remediation applications. This study presents the synthesis of ZnO nanoparticles (NPs) with distinct morphologies, achieved by modulating citric acid concentrations in an ultrasonic-assisted hydrothermal process. The photocatalytic efficacy of these ZnO NPs in degrading malachite green (MG), a persistent environmental pollutant, was thoroughly investigated. Our findings reveal a strong correlation between the morphological features of ZnO catalysts and their photodegradation performance. Among the synthesized NPs, the chrysanthemum-shaped ZnO (denoted as USZ-0.1) demonstrated exceptional photocatalytic activity, attributed to its enhanced surface area and optimized nano-crystal aggregation. This structure facilitated the generation of a higher concentration of reactive oxygen species, leading to over 96.5% degradation of MG within 40 min under simulated sunlight in an acidic medium. This study underscores the potential of morphological manipulation in enhancing the photocatalytic properties of ZnO NPs for environmental applications.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Yu-ning Liu,Jian-jun Li,Guo-jun Weng,Jian Zhu,Jun-wu Zhao
Morphology regulation of heterodimer nanoparticles and the use of their asymmetric features for further practical applications are crucial because of the rich optical properties and various combinations of heterodimers. This work used silicon to asymmetrically wrap half of a gold sphere and grew gold branches on the bare gold surface to form heterogeneous nano pineapples (NPPs) which can effectively improve Surface-enhanced Raman scattering (SERS) properties through chemical enhancement and lightning-rod effect respectively. The asymmetric structures of NPPs enabled them to self-assemble into the monolayer membrane with consistent branch orientation. The prepared substrate had high homogeneity and better SERS ability than disorganized substrates, and achieved reliable detection of malachite green (MG) in clams with a detection limit of 7.8 × 10 −11 M. This work provided a guide to further revise the morphology of heterodimers and a new idea for the use of asymmetric dimers for practically photochemical and biomedical sensing.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2021
·
IF 4.556
Qin Hu,Yikun Cui,Longfei Zhang,Minjie Qian,Lixia Xiao,Ming Yang,Zhen-Quan Yang,Shengqi Rao,Xiaojuan Gong,Jie Han
In this work, a novel fluorescence method based on an orange-emissive carbon dots (O-CNDs) was for the first time reported for the rapid and ultrasensitive determination of malachite green (MG). The O-CNDs were simply produced via a one-pot hydrothermal treatment of rhodamine B. The detection mechanism was based on the interaction between O-CNDs and MG, where the fluorescence of O-CNDs was suppressed by MG via a combined effect of inner filter effect (IFE) and dynamic suppressing. Under the optimum sensing conditions, the O-CNDs were found to display rapid reaction time (1.0 min), high selectivity and excellent sensitivity with two linear concentration ranges of 0.01–0.1 and 0.1–10.0 μmol L −1 , and the corresponding detection limits were as low as 0.08 and 0.93 nmol L −1 , respectively. The developed fluorescence method was successfully applied for the determination of MG in fish samples, including silver carp, blackfish, blunt-snout bream, common carp and grass carp, with satisfactory results; the recoveries were in a range of 96.0–104.8 % and the relative standard deviations (RSDs) below 4.54 %. The results of this study validated the great potential of O-CNDs as an effective fluorescence sensing agent for MG monitoring in aquatic samples.
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Carbon Letters
·
2023
·Vol. 33
·期 7
·2029-2039
·
IF 4.5
Lou Jie,Fu Qiuping,Yu Lei,Yuan Hui,Zhao Jie,Wei Xinde,Wang Tong,Mo Changli
An environmentally friendly and low-cost chitosan-containing polysaccharide (CP) composite ZIF-8/CP was designed and prepared based on the difficulty of separating the traditional adsorbent from the water phase. ZIF-8/CP was synthesized through in-situ growth approach. The physical, chemical and structure properties of ZIF-8/CP were determined through a series of characterization methods, including SEM, FT-IR and PXRD. The effects of touch time, pH, temperature, and co-existing ions on adsorption were assessed. In addition, kinetics, isotherms of adsorption and thermodynamics were examined. The data of isotherms for adsorption indicated that the adsorption of ZIF-8/CP on MG was similar to the Langmuir model, with a maximum adsorption capacity of 1428.57 mg/g. Moreover, the kinetic parameters were consistent with the pseudo-2nd-order equation. Thermodynamic studies (Δ G < 0, Δ H > 0) demonstrated a heat-absorbing and spontaneous adsorption process. Our study reveals that ZIF-8/CP has good adsorption properties and environmental properties.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Bin Yan,Xiaoyu Wang,Xiaoling Zhang,Shengqu Liu,Honglang Lu,Rong Ran
In this study, hydroxyapatite (HAp) nanorods were prepared by a simple hydrothermal method and hydrophobically modified with lauric acid (LA). Modified HAp and magnetic triiron tetraoxide (Fe 3 O 4 ) nanoparticles as emulsifiers were loaded on polycaprolactone (PCL) microspheres by Pickering emulsion template method. The structure, composition and morphology of prepared HAp and m-RHAp-PCL microspheres were characterized by IR, XRD , SEM and TGA . Furthermore, the adsorption capacity of pure HAp and m-RHAp-PCL microspheres was investigated by malachite green (MG) as a model dye. The results showed that the adsorption processes of pure HAp and m-RHAp-PCL microspheres correlated better with the Langmuir isothermal adsorption curve. The maximum adsorption capacity of m-RHAp-PCL microspheres was 609 mg/g, and the relative adsorption capacity of HAp on microspheres was higher than that of pure HAp, indicating its greater adsorption potential for MG. The values of R L and 1/n indicated that the adsorption process was spontaneous. The adsorption kinetic data of samples was in good agreement with the pseudo-second-order kinetic model. In addition, the adsorbent could be easily recovered under magnetic fields. The removal ability of MG was retained after four cycles, which demonstrated the excellent reusability and stability of m-RHAp-PCL microspheres for MG adsorption from aqueous as a potential adsorbent candidate material.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Jing Wu,Xu Jing,Yong Liu,Luyao Zhao,Xuemeng Ji,Hanyue Fu,Bowei Zhang,Yan Zhang,Shuo Wang
Malachite green (MG) and its metabolite leucomalachite green (LMG) are aquaculture-banned drugs whose rapid detections are required yet hindered by the use of expensive instruments as well as the tedious pretreatment procedures for aquatic samples. An integrated workflow for total MG (MG and LMG) analysis in aquatic samples is reported combining a deep eutectic solvent (DES) as the extractant and a paper origami-based micro-total electrochemical immunoassay (μTEI). DES solution (mixture of glycine betaine and ethylene glycol) enables the extraction of MG and LMG with high efficiency from tissue samples and allows grease for separation. The μTEI is compartmentalized simply by manual-folding to implement multiple analytical steps in a programmable manner, including impurity removal, LMG oxidation , MG enrichment, and electrochemical analysis . The entire workflow can be accomplished in 1.0 h, showing a wide linear range of 0.5–100 ppb, a low limit of detection of 0.07 ppb, and a high recovery rate of 78.9–97.6%. The μTEI offers a solution for the rapid accurate monitoring of total MG in aquatic samples and is potentially available for the analysis of other contaminants with proper modifications.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Xiaowei Mu,Xin Liu,Xiwen Ye,Wei Zhang,Lu Li,Pinyi Ma,Daqian Song
Malachite green (MG) is an organic dye compound that is frequently used as a fungicide and antiseptic in aquaculture. However, human or animal exposure to MG causes carcinogenic, teratogenic and mutagenic effects. Herein, a novel fluorescent assay was designed for the detection of MG using manganese dioxide nanosheets (MnO 2 NS) as an energy acceptor to quench the fluorescence of branched poly(ethylenimine) carbon dots (BPEI-CDs) via Förster resonance energy transfer. When butyrylcholinesterase is introduced to form thiocholine in the presence of S-butyrylthiocholine iodide, MnO 2 NS can be recovered by thiocholine to Mn 2+ , resulting in restoration of the fluorescence of BPEI-CDs. Exploiting these changes in fluorescence intensity in the above system, a fluorescence probe was successfully developed for the quantitative detection of MG. Besides, this assay was applied to fish samples, verifying the high potential for practical application of the proposed sensor for the monitoring of MG in aquatic products.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Zi Hao Li,Jia Hao Bai,Xin Zhang,Jia Meng Lv,Cheng Shan Fan,Yong Mei Zhao,Zheng Long Wu,Hai Jun Xu
A facile method for synthesizing Au nanoparticle-coated Fe 3 O 4 magnetic composite nanospheres (Fe 3 O 4 @Au MCS) via seed-mediated growth and iterative reduction is reported. The nanospheres were then successfully used to detect malachite green (MG) residues in water bodies via surface-enhanced Raman scattering (SERS) technique. Fe 3 O 4 @Au MCS has excellent optical properties and superparamagnetism ; it can be dispersed into the solution to fully adsorb target molecules and then collected with a magnet to increase the molecular density and the number of SERS hot spots. Magnetic enrichment was superior to conventional detection method. The limit of detection for MG was 10 −7 M and the enhancement factor was 1.1 × 10 5 . The logarithm of the SERS intensity of the characteristic peak at 1618 cm −1 exhibited a linear relationship with the logarithm of the MG concentration over the range of 10 −3 – 10 −7 M, with a correlation coefficient of 0.966. The Fe 3 O 4 @Au MCS had good uniformity of SERS signals, with a 18.59% relative standard deviation for the SERS intensity. MG detection in aquaculture water conformed with the established quantitative regulations. The SERS spectrum calculated with density function theory for MG adsorbed on Fe 3 O 4 @Au MCS was very close to the experimental spectrum, which verified enhancement by the substrate. Overall, Fe 3 O 4 @Au MCS enabled ultrasensitive, quantitative SERS detection of MG.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Tao Zhang,Wanling Cai,Zuliang Chen
Bio-nanocomposites have attracted increasing research attention because they are able to integrate bio- and nano-related functions, and subsequently demonstrate potentially beneficial environmental applications. Here, a functional bionanomaterial based on Burkholderia cepacian (FZ) immobilized on GO/ZIF-8 was developed and used to remove malachite green (MG), with functions based on both biodegradation and adsorption. XRD and FTIR results showed that in situ production of GO/ZIF-8 by combining Zn 2+ in ZIF-8 with the carboxyl group on the GO surface, led to FZ immobilized in GO/ZIF-8 through covalent bonding. Zeta analysis showed that the surface of FZ and GO/ZIF-8 had different charges under pH = 9.12, suggesting immobilization also occurred via electrostatic action. BET results confirmed that the specific surface area of GO/ZIF-8 was much larger than that of GO and ZIF-8, but the reduced specific surface area of FZ@GO/ZIF-8 could be due to FZ loading on its surface. The efficiency of FZ@GO/ZIF-8 in the removal of MG reached 99% and furthermore retained good stability after five cycles. The efficiency in removing multiple ions in river water reached more than 80%, which is evidence strongly suggesting that FZ@GO/ZIF-8 is an environmental bionanomaterial with effective application potential.
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CHEMOSPHERE
·
2023
·
IF 8.8
Kangkang Wang,Yuli Kou,Kefu Wang,Siqi Liang,Changyan Guo,Wei Wang,Yi Lu,Jide Wang
Microplastics (MPs) and dye pollutants are widespread in aquatic environments. Here, the adsorption characteristics of anionic dye methyl orange (MO) and cationic dye malachite green (MG) on polyamide 6 (PA6) and polyamide 66 (PA66) MPs were investigated, including kinetics, isotherm equilibrium and thermodynamics. The co-adsorption of MO and MG under different pH was also evaluated. The results reveal that the adsorption process of MO and MG is suitably expounded by a pseudo-second-order kinetic model. The process can be characterized by two stages: internal diffusion and external diffusion. The isothermal adsorption equilibrium of MO and MG can be effectively described using the Langmuir model, signifying monolayer adsorption. Furthermore, the thermodynamic results indicated that the adsorption was spontaneous with exothermic and endothermic properties, respectively. The results of binary systems reveal that MO dominates the adsorption at low pH (2–5), while MG dominates at high pH (8–10). Strong competitive adsorption was observed between MO and MG in neutral conditions (pH 6–8). The desorption experiments confirm that PA6 and PA66 could serve as potential carriers of MO and MG. The interaction between dyes and polyamide MPs is primarily mediated through hydrogen bonds and electrostatic attraction. The results reveal that PA6 formed more hydrogen bonds with the dyes, resulting in higher adsorption capacity than that of PA66. This difference can be attributed to the disparities in the synthesis process and polymerization method. Our study uncovered the adsorption mechanism of dye pollutants on PA6 and PA66, and provided a more comprehensive theoretical basis for the risk assessment concerning different types of polyamide MPs in aquatic environments.
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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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CHINESE CHEMICAL LETTERS
·
2017
·
IF 1.932
Han Zhang,Lin Sun,Yuan Zhang,Yan Kang,Huilian Hu,Jibran Iqbal,Yiping Du
This paper reports accurate use of silanized support based substrate for surface-enhanced Raman spectroscopy (SERS) determination of illegal additives chrysoidin and malachite green. Detection of these illegal additives is very meaningful and the developed method meets this objective in a simple, rapid and cost effective way. Detection limits for chrysoidin and malachite green in aqueous solutions reached 0.001 mg/L and 0.0001 mg/L respectively. Linear relationship between the Raman intensities and chrysoidin concentrations in range of 0.001-0.05 mg/L was found with regression coefficient ( R ) of 0.994. To investigate the practical application performance of the method, the substrate was applied to detect chrysoidin in Sprite at 0.01 mg/L and malachite green in fish pond water at 0.0001 mg/L. The SERS method could be an alternative approach for monitoring illegal additives and toxic harmful substances.
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危险品化学品经营许可证（带存储）