APPLIED CATALYSIS B-ENVIRONMENTAL
·
2013
·
IF 5.825
Yanbin Wang,Hongying Zhao,Mingfang Li,Jiaqi Fan,Guohua Zhao
Highly ordered mesoporous copper ferrite (meso-CuFe 2 O 4 ) with high surface area and large pore size was successfully fabricated and firstly proposed as a heterogeneous Fenton catalyst. It was synthesized through the nanocasting strategy by using KIT-6 as hard template. The morphology and physicochemical properties of meso-CuFe 2 O 4 were characterized by SEM, TEM, XRD, XPS, FT-IR, Raman spectra, etc. The obtained results showed that the surface area and the pore size of meso-CuFe 2 O 4 were 122 m 2 g −1 and 9.2 nm, respectively. The meso-CuFe 2 O 4 presented excellent catalytic activity for the degradation of imidacloprid, achieving almost complete removal of 10 mg L −1 imidacloprid after 5 h at the reaction conditions of 0.3 g L −1 catalyst and 40 mM H 2 O 2 . Kinetic analysis showed that the degradation of imidacloprid follows the pseudo-first order. The apparent rate constant for meso-CuFe 2 O 4 was 1.0445 h −1 , which was 1.5, 2 and 2.5 times than those of meso-CoFe 2 O 4 , con-CuFe 2 O 4 and nano-Fe 3 O 4 , respectively. The amount of hydroxyl radical ( OH) generated was directly proportional to the degradation efficiency of imidacloprid, suggesting the involvement of OH in oxidizing imidacloprid. The obtained results indicated that meso-CuFe 2 O 4 presented the highest activity, which was not only due to its ordered mesoporous structure with high surface area and large pore size, but also assigned to the redox recycle of Fe 2+ /Fe 3+ and Cu + /Cu 2+ in meso-CuFe 2 O 4 . The special effect of Cu was discussed in terms of the thermodynamically favorable Fe 3+ reduction by Cu + , regenerating the active species Fe 2+ . The meso-CuFe 2 O 4 presented very low iron leaching (<1 ppm) even in acidic condition and retained almost its high catalytic activity after 5 consecutive runs. Besides, meso-CuFe 2 O 4 possessed medium saturation magnetization, which had provided a potential advantage for the recovery and reuse of catalyst.
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
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 23
·23471-23479
·
IF 2.914
Tao Zhexuan,Deng Jiaqi,Wang Yan,Chen He,Ding Yuan,Hua Xiude,Wang Minghua
A rapid and sensitive immunoassay for the simultaneous detection of imidacloprid and thiacloprid was developed by using magnetic nanoparticles (MNPs) and upconversion nanoparticles (UCNPs). The UCNPs of NaYF 4 :Yb, Er and NaYF 4 :Yb, Tm were synthesized and conjugated with anti-imidacloprid monoclonal antibody (mAb) and anti-thiacloprid mAb as signal labels, while the MNPs were conjugated with antigens of thiacloprid and imidacloprid as separation elements. The fluorescence intensities of Yb/Er- and Yb/Tm-doped UCNPs were detected simultaneously in 544 nm and 477 nm under the excitation of NIR light (980 nm). The amounts of mAb-conjugated UCNPs that were separated by antigen-conjugated MNPs were determined based on competitive immunoassays. Under the optimal conditions, the 50% inhibiting concentration (IC 50 ) and limit of detection (LOD, IC 10 ) were 5.80 and 0.32 ng/mL for imidacloprid and 6.45 and 0.61 ng/mL for thiacloprid, respectively. The immunoassay exhibited negligible cross-reactivity with analogs of imidacloprid and thiacloprid except imidaclothiz (86.2%). The average recoveries of imidacloprid and thiacloprid in environmental and agricultural samples, including paddy water, soil, pears, oranges, cucumbers, and wheat, ranged from 78.4 to 105.9% with relative standard deviations (RSDs) of 2.1–11.9% for imidacloprid and ranged from 82.5 to 102.3% with RSDs of 1.0–16.5% for thiacloprid. In addition, the results of the immunoassay correlated well with high-performance liquid chromatography for the detection of the authentic samples.
研究领域:
分析化学
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环境科学
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农业科学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROANALYSIS
·
2021
·Vol. 33
·期 9
·2048-2052
·
IF 3.223
Lei Liu,Jiawei Guo,Longhua Ding
An electrochemical sensor based on raffia derived porous carbon (RPC) and polyaniline (PANI) composite functional glass carbon electrode (GCE) was constructed for imidacloprid (IMI) determination. PANI nanowire arrays were deposited on RPC surface uniformly without aggregations. The electrochemical response of IMI at RPC@PANI/GCE is about four times than that at bare GCE, indicating high electrocatalytic activity of RPC@PANI towards IMI reduction. The prepared sensor also offers a wide linear range of 0.1–70 μg mL −1 for IMI determination with a limit of detection (LOD) of 0.03 μg mL −1 . In addition, it offers high recoveries with testing real samples.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Mengzhu Xue,Peiyao Li,Chang Li,Yonghao Qi,Zhentong Han,Jiarui Li,Ao Li,Tianjiao Xia
Graphene oxide (GO) is a representative novel carbonaceous nanomaterial, and neonicotinoid insecticides (NEOs) are currently the insecticides with the highest market share in the world. Their widespread application deservedly leads to their release to the environment. Thus, the complex interactions of these two types of organic compounds have attracted extensive attention. In this study, the effects of GO and its derivatives, reduced GO (RGO) and oxidized GO (OGO), on the photolysis of imidacloprid (IMD) (a typical NEO) under ultraviolet (UV) irradiation were systematically investigated. The results showed that the presence of the graphene-based nanomaterials (GNs) largely depressed the photodegradation of IMD, and the inhibition degree followed the order of RGO > GO > OGO. This was because the sp 2 π-conjugated structure in the GNs caused light-shielding effect and attenuated the direct photolysis of IMD, even though the GNs-generated reactive oxygen species (ROS) promoted the indirect photodegradation of IMD to a certain extent. Additionally, the rich O-functionalized GO and OGO altered the photolysis pathway of IMD and induced more toxic intermediate products. These results highlight the implication of carbonaceous nanomaterials on the behavior, fate and potential risk of NEOs in aqueous systems.
研究领域:
环境科学
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纳米技术
·
化学工程
·
毒理学
✓ 已验证
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 10
·1-10
·
IF 5.833
Chen He,Sun Wanlin,Zhang Zhongrong,Tao Zhexuan,Qin Yuling,Ding Yuan,Wang Limin,Wang Minghua,Hua Xiude
Two high-sensitivity competitive immune-nanoplatforms based on the inner filter effect (IFE-IN) and magnetic separation (MS-IN) with a positive readout were developed to rapidly detect imidacloprid (IMI) using gold nanoparticles (AuNPs). For IFE-IN, IMI competes with AuNPs-labeled IMI antigens (IMI-BSA-AuNPs) to bind with anti-IMI monoclonal antibody (mAb)-conjugated NaYF 4 :Yb,Er upconversion nanoparticles, which changes the fluorescence signal at excitation/emission wavelength of 980/544 nm. For MS-IN, the immunocomplex of IMI-BSA-AuNPs and magnetic-nanoparticles-labeled mAb (mAb-MNPs) dissociates in the presence of IMI, and the optical density of IMI-BSA-AuNPs at 525 nm increases with the IMI concentration after magnetic separation. Under the optimal conditions, the IMI concentration producing a 50% saturation of the signal (SC 50 ) and linear range (SC 10 − SC 90 ) were found to be 4.30 ng mL −1 and 0.47 − 21.37 ng mL −1 for IFE-IN, while 1.21 ng mL −1 and 0.07 − 10.21 ng mL −1 for MS-IN, respectively. Both IFE-IN and MS-IN achieved excellent accuracy for the detection of IMI in different matrices. The quantities of IMI in apple samples detected by IFE-IN and MS-IN were consistent with the high-performance liquid chromatography results. Graphical abstract For IFE-IN, analyte competes with AuNPs-labeled-antigen to bind with the mAb-conjugated-UCNPs, which changes the fluorescence signal at 544 nm. For MS-IN, the immunocomplex of AuNPs-labeled-antigen and mAb-conjugated-MNPs dissociates in the presence of analyte, and the optical density of AuNPs-labeled-antigen at 525 nm increases with increasing analyte concentration after separation.
研究领域:
分析化学
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纳米技术
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环境科学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PLoS One
·
2021
·Vol. 16
·期 9
·e0257042
·
IF 3.24
Sihua Peng,Shuyan Yang,Xi Zhang,Jingjing Jia,Qiulin Chen,Yuyang Lian,Aqiang Wang,Bei Zeng,Heming Yang,Jinlei Li,Jianguo Dan,Jianjun Liao,Shihao Zhou
Imidacloprid is a neonicotinoid insecticide widely used in the production and cultivation of crops. In recent years, the extensive use of imidacloprid in agricultural production has resulted in large amounts of pesticide residues in agricultural products and the environment. Therefore, it is necessary to establish a rapid, accurate, sensitive and convenient method for detecting imidacloprid pesticide residues to ensure the safety of agricultural products and the environment. To clarify how to use the molecular imprinting method for the electrochemical rapid residue detection of imidacloprid. This paper selected reduced graphene oxide and gold nanoparticles as modifiers modified on screen-printed carbon electrodes (SPCE) chitosan as a functional monomer, and imidacloprid as template molecule to prepare molecularly imprinted polymer, and applied this sensor to the residue detection of imidacloprid. The results showed that the concentration of imidacloprid showed a good linear relationship with the peak response current, and the detection limit of imidacloprid was 0.5 μM, while the sensor had good repeatability and interference resistance. The recoveries of imidacloprid spiked on three samples, mango, cowpea and water, were in the range of 90–110% (relative standard deviation, RSD<5%), which proved the practicality and feasibility of the assay established in this paper. The results of this paper can be used as a basis for the research on the detection of imidacloprid pesticide residues in food or environment.
研究领域:
农业科学
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环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 4
·1-14
·
IF 6.048
Liu Weiyi,Pan Ting,Liu Hang,Jiang Mengyun,Zhang Tingting
The photo-aging behavior of microplastics (MPs) in natural environment has become a global concern. The ultraviolet radiation has enough energy to change the polymer structure and physical-chemical properties of MPs. Less attention has focused on the interactions of the photo-aged polar and biodegradable MPs with organic pollutants. This work investigated the structural properties of aged polar polyamide (PA) MPs and biodegradable polylactic acid (PLA) MPs exposed to ultraviolet irradiation and their adsorption behavior and mechanism for neonicotinoid insecticide imidacloprid (IMI). The results showed that the MPs had extensive changes in surface morphology and chemical properties after photo-aging. The C−N bond of PA MPs was disrupted to form more carbonyl groups. The oxygen-containing functional groups on the surface of aged PLA MPs were broken and generated relatively smaller molecules. The adsorption capacity of IMI on PA MPs decreased by 19.2 %, while the adsorption capacity of IMI on PLA MPs increased by 41.2 % after photo-aging. This depended on the natural structure of the MPs and their ability to absorb ultraviolet light. The electrostatic interactions, hydrogen bonds, van der Waals interactions, and polar-polar interactions were the main adsorption mechanisms of IMI on MPs. High initial solution pH and low ionic strength favored the adsorption of IMI by altering charge distribution on the MPs surface. The formation of the humic acid-IMI complexes decreased the concentration of IMI in the water phase and further decreased the adsorption on MPs. These results are enlightening for a scientific comprehension of the environmental behavior of the polar MPs.
研究领域:
环境科学
·
生态学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2025
·Vol. 17
·期 24
·5034-5044
·
IF 2.6
Xinzheng Zhu,Ruimei Wu,Xu Wang,Xin Fu,Zhongshou Liu,Xiang Geng,Jie Teng
In this study, ultra-thin metal–organic framework nanosheets (MOFNs) were used for preparing an enhanced substrate to rapidly detect imidacloprid residues in citrus based on surface-enhanced Raman scattering (SERS) technology. The ultrasonic stripping method was used to prepare Co-MOFNs. Subsequently, a CoAg-MOFN-enhanced substrate was prepared by loading AgNPs onto the Co-MOFNs to enhance the SERS signal. The effects of the concentration of AgNPs, the ratio of Co-MOFNs to AgNPs, and the mixing time between the as-prepared enhanced base and imidacloprid standard solution on the SERS peak intensity were investigated, which showed that when the concentrated volume of AgNPs was 20 times and the mixed volume ratio of Co-MOFNs and AgNPs was 1 : 1, the prepared CoAg-MOFNs exhibited a good SERS enhanced effect. Notably, SERS response was the best when the CoAg-MOFN nanocomposite was mixed with an imidacloprid pesticide for 1 min. Utilizing density functional theory (DFT), four Raman characteristic peaks, specifically at 764, 784, 942 and 1035 cm−1, were identified for the qualitative and quantitative assessment of imidacloprid pesticide residues in citrus fruits. A quantitative analysis curve representing imidacloprid residues was developed, correlating the intensity at 1035 cm−1 over a range of 0.5–50 mg kg−1 (y = 2.7964x + 26.211, R2 = 0.9923), which demonstrated a strong linear relationship. The limit of detection (LOD) was 0.5 mg kg−1 and the limit of quantitation (LOQ) was 0.5 mg kg−1, which could meet the maximum residue limit (MRL) of 1 mg kg−1 stipulated by the Codex Alimentarius Commission (CAC) and European Union (EU). The recovery rates were 93.02–101.07%, and the RSD was 2.57–7.71%, indicating that the prepared CoAg-MOFN nanocomposite combined with the SERS method is suitable for the analysis of imidacloprid pesticide residues in citrus.
研究领域:
分析化学
·
材料科学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Yan Chen,Deyang Kong,Lei Huang,Jing Xu,Haiyan Wang,Feng Ge
Although imidacloprid is widely used and registered for radish cultivation in China, its metabolic fate in radish remains unclear, posing uncertainties in consumer safety. Herein, we employed 14 C-imidacloprid to elucidate its distribution and metabolism in cherry radish. Residue analysis showed higher accumulation in shoots (1.15–1.32 μmol) than roots (0.0210–0.0678 μmol). Imidacloprid in radish dissipated following first-order kinetics, with a half-life of 18.5 d. Parental imidacloprid was confirmed in roots, while four metabolites, predominantly olefin and 4/5-hydroxy imidacloprid, were identified in shoots. The proposed pathway involves hydrolysis of the imidazole ring to form hydroxyl derivatives, followed by dehydration to olefin products. Notably, dietary risk assessment revealed risk quotient values up to 20 % in some individuals consuming radish leaves, highlighting the need for stricter monitoring. Overall, these findings fill the knowledge gap regarding imidacloprid metabolism in radishes and offer vital insights into optimizing pesticide usage while maintaining food safety.
研究领域:
农业科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Haofeng Zhu,Juan Wu,Zijian Tong,Qiuyue Zhao,Qinghua Zhou,Anping Zhang,Jianqiang Sun
The continuous accumulation of metallic nanoparticles and pesticide residues in agroecosystems poses potential risks to food safety and plant health, yet their potential interactive toxicity remains poorly understood. Here, we investigated the mutual effects of zinc oxide nanoparticles (ZnONPs) and the imidacloprid (IMI) on their bioaccumulation, phytotoxicity and the underlying molecular mechanisms in lettuce. After 14 days of exposure, co-exposure to ZnONPs and IMI significantly aggravated phytotoxicity compared to individual treatments, as evidenced by greater biomass reduction, elevated oxidative stress, and intensified metabolic disruptions. Additionally, mixture treatments significantly increased both Zn and IMI accumulation in shoots, indicating enhanced uptake and upward translocation due to their coexistence. The biotransformation of IMI into 5-OH-IMI was enhanced by ZnONPs by 5.8–130 % in lettuce, with the magnitude depending on particle size and IMI concentration. For the comparison between different particle sizes, 90 nm ZnONPs led to higher Zn and IMI accumulation in shoots, whereas 30 nm ZnONPs more efficiently enhanced IMI metabolism. These accumulation patterns were closely linked to the distinct metabolic reprogramming. Co-exposure uniquely activated pathways related to amino acid and energy metabolism, indicating increased amino acid turnover and elevated energy demand for detoxification and damage repair. Altogether, the findings provide new mechanistic insights into nanoparticle–pesticide interactions in edible plants and emphasize the need to consider co-contaminant scenarios in environmental risk assessment.
研究领域:
植物科学
·
纳米毒理学
·
环境毒理学
·
农业化学
·
代谢组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Yue Sun,Ning Zhang,Chang Han,Zhiyang Chen,Xiaodong Zhai,Zhihua Li,Kaiyi Zheng,Jianfei Zhu,Xin Wang,Xiaobo Zou,Xiaowei Huang,Jiyong Shi
The sensitive detection of pesticides in complex environment is important but still challenging in presence of organic-rich water sample and food matrix. Herein, we reported a nitrile-mediated SERS immunosensor for sensitive and optical anti-interference determination of imidacloprid. Raman tag contained C N bond could provide a sharp characteristic peak in the Raman-silent spectral window (1800 ~ 2800 cm −1 ), which could resist the optical noises from the fingerprint region (<1800 cm −1 ). Au core -Ag shell bimetallic nanocuboid (AuNR@Ag) connected with antigen and Raman tag was used as Raman probe, while Fe 3 O 4 magnetic nanoparticle functionalized with anti-imidacloprid antibody was applied as signal enhancer. Owing to the specific recognition ability between antigen and antibody, the competitive system with imidacloprid was formed. Under the optimal condition, the linear relationship was developed in the range of 10–400 nM. Finally, the SERS immunosensor was successfully applied to determine imidacloprid in real samples with recoveries from 96.8% to 100.5%.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Yijian Zhao,Xiaohan Zheng,Qinzhi Wang,Taotao Zhe,Yaowen Bai,Tong Bu,Meng Zhang,Li Wang
Various pesticides employed in modern agriculture result in large amounts of pesticide residues in agricultural production, greatly threatening human health. Herein, we report a facile approach to fabricate a reduced graphene oxide/cyclodextrin modified glassy carbon electrode (rGO/CD/GCE) for the sensitive electrochemical sensing of imidacloprid (IDP). Three different modified electrodes using CDs ( α -, β -, γ -CD) were fabricated, and their electrochemical performance was further studied. The results demonstrate that α -CD possesses the best signal amplification for IDP. Compared with wet-chemical synthesis of rGO/CDs (W-rGO/CDs), the electrochemical synthesis of rGO/CDs (E-rGO/CDs) produced sensors that showed better performance for IDP sensing. Taking advantage of prepared E-rGO/ α -CD nanocomposite, the fabricated sensor offered a low detection limit (0.02 μM) with a wider linear range (0.5–40 μM) and long-term stability. The new sensor was successfully applied for the detection of IDP in brown rice, providing a new technique for efficient and convenient monitoring of pesticide residues in food.
研究领域:
分析化学
·
食品科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）