Analytical Methods
·
2023
·Vol. 15
·期 35
·4494-4505
·
IF 3.1
Chao Sun,Lizheng Wang,Naiyu Guo,Runze Hu,Li Ye,Zhiming Hu,Jianjun Ding
Surface-enhanced Raman scattering (SERS) has a unique fingerprint spectrum, which allows for rapid, highly sensitive, and non-destructive detection without the need for sample pretreatment. However, SERS substrates have disadvantages such as short storage time and poor reproducibility. In this study, carbon nanotubes, gold, and silver were combined to take advantage of their inherent structural and characteristic properties that enhance the Raman effect. A new type of SERS composite substrate, CNTs/Ag@Au/SiO2, was prepared using a hydrothermal method and seed growth method. The substrate was characterized using transmission electron microscopy (TEM), and the average distance between the core–shell nanoparticles was found to be 3.1 nm, which is more suitable than other gold–silver combined core–shell structures and significantly improves the SERS enhancement factor. The substrate demonstrated high sensitivity even at low concentrations of probe molecules and good uniformity at five randomly selected locations. After storage for 45 days, the substrate still exhibited good stability. In most gold–silver combined core–shell structures, the detection limit for Rhodamine 6G (R6G) is 10−9 mol L−1, while in this substrate, the detection limit for R6G is 10−11 mol L−1. Furthermore, the contribution of the substrate's enhancement was deeply investigated using finite-difference time-domain (FDTD), which revealed that the substrate's hotspots were present in two forms: the “hotspots generated between Ag@Au nanoparticles” and the “hotspots generated between Ag@Au nanoparticles and carbon nanotubes”. These two forms of hotspots also demonstrated that the performance brought about by the preparation of the substrate structure was reliable. The simulation results were compared with the experimental results, and the analysis showed that the real environment would have an impact on the substrate's structure during the actual substrate preparation process. Finally, the substrate was used for detecting the pesticide fipronil, and the results showed clear peaks even at a concentration of 0.1 mg L−1. The results indicated that the Raman intensity was linearly exponential with the fipronil solution concentration, with a determination coefficient of R2 = 0.991. This study provides a new SERS substrate for pesticide residue detection and further explores the improvement of pesticide detection limits.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Fu-Rong Xiu,Xue Bai,Yingying Qi,Xiang Gao,Man Zhao
Pesticide residues in agricultural products are serious threat to people's health. Real-time monitoring of pesticides residues in the environment and agricultural products posed challenges to sustainable methods with high analytical performance for pesticide detection. Herein, waste PVC/coal fly ash (the mass ratio of PVC and coal fly ash was 4:1) was dechlorinated in subcritical water at low temperature to achieve nearly 100 % dechlorination of PVC and obtain carbon-based composite materials (CM-Fe/Al/Si-dPVC) with strong sening activity. For CM-Fe/Al/Si-dPVC, C Fe bonding resulted in strong electron migration, and nano/μm SiO 2 and Al 2 O 3 doping in the layered polyene C matrix provided large specific surface area , and silicon hydroxyl created good heterogeneous catalytic interfaces. CM-Fe/Al/Si-dPVC could strongly trigger luminol chemiluminescence (CL) reaction and produce intense CL signals. Neonicotinoid pesticides (acetamiprid and imidacloprid) bonded with CM-Fe/Al/Si-dPVC through coordination chelation and hydrogen bonding , which shielded the catalytic active site and increased the Fermi level of system, thus quenching CL reaction. Inspired by these, a cheap CL assay was constructed for detecting neonicotinoids combinations of acetamiprid and imidacloprid (NICs). The detection limits of NICs were 0.7 ng/L. Satisfactory recoveries were obtained for real agricultural products and environmental samples. The results of life cycle evaluation (LCA) revealed that the strategy had significantly small global warming potential (GWP). This work presented a sustainable method with environmental benefits for the detection of neonicotinoids, and also opened up new way for the recycling of organic solid wastes .
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yong Yang,Xinxin Ma,Zifen Li,Yanru Wang,Chao Ju,Lidong Cao,Yongquan Zheng,Qingming Zhang
Neonicotinoids, ones of the most used pesticides extensively present in water environment, are hazardous to environment and human. Herein, a novel magnetic adsorbent ZIF-8-HA@MCSB is designed by modifying ZIF-8 and humic acid (HA) onto the surface of magnetic corn stalk biochar (MCSB) for removing imidacloprid (IMI) and thiamethoxam (THI) from water. MCSB has a superior adsorption performance among magnetic biochars (MBCs); the modification of ZIF-8 creating hierarchically porous structure and HA promoting the crystal growth of ZIF-8 can enhance its adsorption performance. Hence, ZIF-8-HA@MCSB exhibits the high maximum adsorption capacities for IMI (163.9 mg g −1 ) and THI (123.5 mg g −1 ). Meanwhile, the HA modification offers a protective shell for magnetic Fe 3 O 4 , which endows ZIF-8-HA@MCSB with distinguished magnetic stability. Even in pH = 2 solution, ZIF-8-HA@MCSB still possesses a saturation magnetization value of 13.07 emu g −1 , which is beneficial for its separation and reuse. Especially, ZIF-8-HA@MCSB can be repeatedly used 5 times with high removal efficiencies (over 90%). Furthermore, the low Fe (less than 0.3 mg L −1 at pH ≥ 2) and Zn (less than 1.0 mg L −1 at pH ≥ 3) leaching concentrations in a wide pH range guarantee the environmental security of ZIF-8-HA@MCSB. And a promoting effect on wheat growth enables waste ZIF-8-HA@MCSB potentially to be fertilizer for crop production, which agrees with the sustainable concept. Therefore, the advantages of having high adsorption capacities for IMI and THI, resistant to acid, and friendliness to environment indicate that ZIF-8-HA@MCSB has a significant potential for real neonicotinoids removal. Novelty Statement In this work, a novel magnetic adsorbent (ZIF-8-HA@MCSB) with the high adsorption capacities of IMI and THI is obtained by simply modifying ZIF-8 and humic acid (HA) onto the magnetic corn stalk biochar (MCSB) surface. Such a magnetic adsorbent has never been reported before. More importantly, compared with various modification methods to increase the adsorption capacity, there are few reports on concerning the acid resistance and environmental friendliness of magnetic adsorbents, especially the corresponding adsorption capacity also increases.
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
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Samaneh Rashtbari,Gholamreza Dehghan,Yasin Orooji,Simin Khataee,Arezu Marefat,Leonid G. Voskressensky,Alireza Khataee
The extensive use of pesticides in modern agriculture has raised concerns about environmental contamination and adverse human health effects. Therefore, developing highly sensitive detection methods to identify pesticide residues is crucial for food safety and ecosystem protection. In this study, the Fe 2 AlB 2 MAX phase was synthesized and characterized. After evaluating its peroxidase-mimetic performance using a colorimetric method, a new, sensitive, and simple dual fluorescence-colorimetric sensor was developed for the quantification of two common pesticides, acetamiprid (ACP) and imidacloprid (IMP), using fluorescein (FL). The developed method is based on the inhibitory impact of ACP and IMP on the enzymatic performance of the Fe 2 AlB 2 MAX phase, specifically the inhibition of hydroxyl radical ( OH) generation, which enhances the absorption and emission intensities of FL. The results confirmed that OH generated through the breakdown of H 2 O 2 via the catalytic activity of the MAX phase can decrease the intrinsic absorption and emission intensities of FL. However, ACP and IMP inhibit the peroxidase-like activity of the MAX phase, leading to increased absorption and emission intensities of FL. The limit of detection values calculated for spectrophotometric and spectrofluorimetric quantifications were 2.8 μM and 0.051 μM for ACP and 1.72 μM and 0.013 μM for IMP, respectively. Furthermore, the proposed method was successfully utilized to accurately and reliably determine ACP and IMP in spiked real samples with satisfactory accuracy and precision. These developed methods offer several advantages, making them promising candidates for the direct, rapid screening of pesticide residues.
研究领域:
食品安全
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2014
·
IF 1.321
Jie Liu,Yinfeng Li,Ge Song,Kai Zhang,Baoxian Ye
A new voltammetric sensor, based on multi-walled carbon nanotubes (MWCNTs) composite poly(aspartic acid) film modified glassy carbon electrode, was fabricated and used for determination of pesticide imidacloprid. The synergistic effect of MWCNTs and the polymer resulted in a significantly improved electrochemical response (in terms of sensitivity, accuracy and analytical range) towards imidacloprid. Under selective conditions, the determination linear range was from 1.53 × 10−5 g L−1 up to 1.53 × 10−2 g L−1 with a detection limit of 1.15 × 10−5 g L−1 (S/N = 3). The sensor also had an easily renewable surface, good fabrication reproducibility, and inherent stability. Moreover, satisfactory results were obtained with complex samples and demonstrate the reliability of the proposed method.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2021
·
IF 8.071
Sen Yan,Sinuo Tian,Zhiyuan Meng,Wei Sun,Ning Xu,Ming Jia,Shiran Huang,Yu Wang,Zhiqiang Zhou,Jinling Diao,Wentao Zhu
Although many toxicological studies on pesticides and nanoparticles have been conducted, it is not clear whether nanoparticles will increase the toxicity of pesticides. In this study, we chose imidacloprid (IMI) as a representative pesticide, and explored the influence of ZnO NPs on the toxic effect of IMI. In addition, we studied the bioaccumulation of IMI in mice. Using biochemical index analysis, liver histopathological analysis, non-targeted metabolomics, and LC/MS analysis, we found that ZnO NPs increased the toxicity of IMI, which may be related to the increase in IMI bioaccumulation in mice. In addition, we used intestinal histopathological analysis, RT-qPCR, and 16sRNA sequencing to find that the disturbance of the gut microbiota and the impaired intestinal barrier caused by ZnO NPs may be the reason for the increase in IMI bioaccumulation. In summary, our results indicate that ZnO NPs disrupted the intestinal barrier and enhanced the bioaccumulation of IMI, and therefore increased the toxicity of IMI in mice. Our research has deepened the toxicological insights between nanomaterials and pesticides.
研究领域:
毒理学
·
纳米技术
·
药理学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yong Yang,Xinxin Ma,Chunhong Yang,Yanru Wang,Jingli Cheng,Jinhao Zhao,Xiaowu Dong,Qingming Zhang
Neonicotinoids, extensively present in water environment, can adversely affect the ecological safety and human health. Herein, a low-cost magnetic porous carbon ZIF-67/CS@C derived from ZIF-67 and agricultural waste corn stalk (CS) is designed and applied for adsorptive removal of imidacloprid and thiamethoxam from water. The adsorbent is fabricated by carbonizing ZIF-67/CS hybrid pre-prepared through an in-situ decoration of ZIF-67 on the surface of CS, and then acid picking to elute the unstable constituents. In the carbonization, Co 2+ ions are reduced to magnetic Co 0 nanoparticles, with the result that ZIF-67/CS@C shows a strong magnetic response (saturation magnetization intensity is 12.25 emu‧g −1 ) and can be easily magnetically separated. Meanwhile, Co nanoparticles are protectively encapsulated in well-developed graphitized wall, which endows ZIF-67/CS@C with good acid resistance (only 0.23% of Co is leached out at pH 1.0). More importantly, reasonable pore size distribution (most pore sizes match or are 3–6 times that of imidacloprid and thiamethoxam) and high external surface area (280 m 2 ‧g −1 ) are obtained, which makes ZIF-67/CS@C super adsorbent. The adsorption capacities for imidacloprid and thiamethoxam can reach as high as 189 and 133 mg‧g −1 , respectively. Moreover, after six consecutive recycling processes, the adsorption efficiencies are still above 95%, which reveals excellent reusability of ZIF-67/CS@C. Mechanism analysis affirms that pore-filling, H-bond, and π-π EDA interaction are mainly responsible for driving imidacloprid and thiamethoxam adsorption. Finally, ZIF-67/CS@C with a great security towards Daphnia carinata survival and wheat growth is eco-friendly. This study can be easily adapted to different biomass wastes and MOFs, thus potentially enabling the preparation of more novel adsorbents.
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
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 33
·14180-14188
·
IF 3.288
Jingjing Zhang,Jingtao Dai,Jian Chen
To compare photodegradation processes in single- and binary-contaminant systems, a representative antibiotic (tetracycline) and insecticide (imidacloprid) were employed as two contaminants of emerging concern. Ag/AgBr modified BiOBr was synthesized hydrothermally in an ionic-liquid/water medium and characterized via various techniques to support mechanistic studies. As-prepared flower-shaped Ag/AgBr/BiOBr exhibits superior photocatalytic activity to Ag/AgBr and BiOBr. Parallel experiments were conducted in single-contaminant systems to optimize the solution chemistry for comparison studies; these suggested that the photodegradation rate (DR) is highest at 1.0 g L−1 at catalyst dosages ranging from 0.6 to 1.4 g L−1, while raising the initial concentration reduces the DR. Additionally, electrostatic interactions between the reactants and photocatalyst cause DR fluctuations at different pH values. In the mechanistic studies, the contributions of the dominant active species (˙O2− and h+) were analysed quantitatively through quenching tests with scavengers. Furthermore, electrostatic interactions between the reactants and the active species result in non-equilibrated contributions from ˙O2− and h+ in single-contaminant systems. Comparison studies distinctly demonstrated a synergistic effect in binary-contaminant systems, which is caused by the mutually complementary utilization of h+ and ˙O2− during the photodegradation of tetracycline and imidacloprid.
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2022
·Vol. 29
·期 1
·399-410
·
IF 2.961
Han Jia-Jun,Ma Li-Ping,Liu De-Li,Wang Yan-Fang
An electrochemical sensor based on cetyltrimethylammonium bromide–functionalized graphene oxide/multi-walled carbon nanotube (CTAB-GO/MWCNTs)nanocomposite–modified glassy carbon electrodes was designed for use in rapid detection of imidacloprid (IMD) in agricultural products. Field emission scanning electron microscopy (FE-SEM) and X-ray diffractometer (XRD) were used to elucidate the surface features of CTAB-GO/MWCNT nanocomposites. Electrochemical studies were performed using two methods, including cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Under the optimized experimental conditions, the peak current responds linearly with concentration (1.0–13.0 μM) with a limit of detection (LOD) of 0.144 μM. The sensor has good selectivity, reproducibility, and stability. The sensor was used to detect IMD in actual samples, and the recovery rate was 97.7– 101.5%, which proved the feasibility of the determination method and provided an effective way for efficient monitoring of IMD in agriculture.
研究领域:
分析化学
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 12
·3101-3109
·
IF 4.831
Li Shuhuai,Liu Chunhua,Yin Guihao,Luo Jinhui,Zhang Zhenshan,Xie Yixian
The authors describe an electrochemical sensor for the neonicotinoid insecticide imidacloprid (IMI) based on Pt-In catalytic nanocomposite film and Bromophenol blue amplification. The Pt-In nanocomposite film was deposited on the surface of a modified glassy carbon electrode. The composite molecularly imprinted polymer (MIP) was prepared by electro-polymerization using bromophenol blue doped o -aminophenol as functional monomer and 4-tert-butylcalix[6]arene-IMI supramolecular inclusion complex as template molecule. The experimental results showed that the current intensity of IMI was clearly amplified in the potential range from −0.3 to −1.8 V, because of the double amplification, based on the Pt-In film and Bromophenol blue catalysis. Moreover, the double recognition ability of the sensor, which relied on the MIP and the vacuum structure of 4-tert-butylcalix[6]arene, effectively increased the specific recognition performance. The feasibility of its practical applications has been demonstrated by the analysis of vegetable samples.
A supramolecular imprinted electrochemical sensor for imidacloprid determination was prepared based on Pt-In nanocomposite film and bromophenol blue amplification. Because of the advantages of the specific recognition sites in MIPs and supramolecular chemistry, the sensor showed good selectivity for imidacloprid.
研究领域:
分析化学
·
环境科学
·
农业科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 17
·9277-9286
·
IF 2.936
Nadeem Muhammad,Fenglian Wang,Qamar Subhani,Qiming Zhao,Muhammad Abdul Qadir,Hairong Cui,Yan Zhu
There are increasing concerns about the dietary risks of neonicotinoids (NNIs); therefore their sensitive and accurate determination in dietary products is indispensable. However, the complex composition of agricultural food matrixes makes their extraction and quantitative determination a challenging task. Realizing this need, we herein report a simple, cost-effective, selective and sensitive fluorescence analytical workflow for analyses of two non-fluorescent neonicotinoids imidacloprid (IMI) and clothianidin (CLT) in six complex food samples (honey, ginger, durian, apple, tomato, cucumber) by online clean-up of sample extracts using two-dimensional ion chromatography (2D-IC) and a subsequent online post column UV induced fluorescence detection system. This online clean-up setup has proven advantageous to improve the limit of detection, potentially diminish matrix effects, and reduce analysis time and labor. The developed method showed excellent analytical figures of merit including linearity, selectivity, repeatability, recovery, and resolution for analysis of IMI and CLT in food samples.
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Mingfei Pan,Mengmeng Gao,Jingjing Cui,Rui Gao,Huilin Li,Jingming Sun,Wenjie Chen,Shuo Wang
This study integrated nitrogen-doped carbon dots (nitrogen-doped CDs) with remarkable fluorescence into a high-porosity inverse opal photonic crystal (IOPC) structure. A portable fluorescent hydrogel strip was developed by incorporating molecular imprinted biomimetic recognition, enabling the rapid identification and accurate detection of the insecticide imidacloprid (IMI). The ordered and hierarchical architecture of the IOPCs was advantageous to the uniform dispersion of nitrogen-doped CDs while providing efficient mass transfer channels for IMI. Additionally, the sensing strips achieved adsorption equilibrium within 20 min and demonstrated excellent selectivity, stability, and reusability. They showed a linear response to IMI across the range of 0.1–50 μg/mL ( R 2 = 0.9905) with a detection limit of 0.065 μg/mL (S/N = 3). The spiked recoveries ranged from 88.2 % to 102.8 %, aligning well with HPLC results. This indicates that the developed fluorescent molecularly imprinted hydrogel sensing strip is an effective analytical tool for detecting IMI residues in food products.
研究领域:
分析化学
·
食品安全检测
·
材料科学
✓ 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）