PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Zhikang Deng,Yongtao Cheng,Jinyao Zhu,Lie Yang,Zulin Zhang,Li Wu
Thiacloprid (THI), as a commonly used neonicotinoid, is frequently detected in environmental media, posing a potential threat to the environment and organisms. In this study, microalgae fuel cells (MFCs) with Chlorella sp. as cathode and wastewater (with sludge) as anode were constructed to remove THI (10, 20 and 50 mg/L) while generating bioelectricity . The results showed that, comparing with the open-circuit condition, the generation of bioelectricity (closed-circuit) significant enhanced the removal of THI by 13.14–32.47%. The presence of low concentration of THI (10–20 mg/L) did not significantly affect the accumulation of Chlorella sp. biomass, while high concentration THI (50 mg/L) strongly depressed its biomass. It was also found that high concentration THI caused obvious oxidative damages (MDA) to Chlorella sp., although SOD activity was upregulated. Both the highest THI removal efficiency (%) and stable bioelectricity voltage (202 mV) occurred at the low THI concentration (10 mg/L). Seven degradation products of THI were identified and the oxidation of the thiazole ring was the main detoxification way of THI. Additionally, toxicity evaluation also showed that the toxicity of degradation products were lower than THI. This study implies that MFCs could be a promising application, coupling pollutants removal , bioenergy generation and biomass production.
研究领域:
环境科学
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微生物学
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 62
·38884-38894
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IF 3.108
Tianjiao Xie,Min Zhang,Pan Chen,Haitian Zhao,Xin Yang,Lei Yao,Hua Zhang,Aijun Dong,Jing Wang,Zhenyu Wang
In this study, we report a facile method for the preparation of molecularly imprinted polymer based graphene for the electrochemical detection of thiamethoxam residue. We choose p-vinylbenzoic acid as a functional monomer; it can be used to add recognition units and alkenyl units onto the surface of graphene via π–π interactions in just one step, effectively simplifying the reaction process. And an ultra-thin imprinting film (2 nm) is formed by reducing the addition step involving the alkenyl modifier. Due to the irreversible electrochemical reduction characteristics of thiamethoxam, the template can be removed easily using cyclic voltammetry scanning, without the need for organic solvents. The performance of the fabricated sensor was evaluated and the results indicated that the sensor exhibited excellent specific recognition abilities for thiamethoxam detection; the imprinting factor is 2.36. The peak current from thiamethoxam is linearly proportional to its concentration over the range from 0.5 to 20 μM, and the detection limit is 0.04 μM. The practical application of the sensor was also realized in the selective detection of thiamethoxam in real samples.
研究领域:
分析化学
·
环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Qinxue Xiong,Yi Chen,Tiefeng Xu,Zhexin Zhu,Wenxing Chen,Wangyang Lu
In this work, a flexible photocatalytic material (TiO 2 @g-C 3 N 4 -cotton) was obtained using modified graphitic carbon nitride (g-C 3 N 4 -CONH-KH550) for the a connection between the natural cotton supports and titanium dioxide (TiO 2 ) successively. Under the visible light, a valid photocatalytic activity was observed in the degradation of sulfaquinoxaline (SQX) and thiamethoxam. According to the support stability tests and the UV accelerated aging tests, g-C 3 N 4 -CONH-KH550 could shelter the supports with TiO 2 from the oxidation attack by hydroxyl radicals (•OH) generated. The investigation of antibacterial activity showed efficient inactivation of both Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ). Therefore, TiO 2 @g-C 3 N 4 -cotton showed stronger mechanical performance and much longer lifetime compared with TiO 2 @cotton. The degradation products and processes of substrates were investigated. This paper provides a new idea about the construction of an efficient and stable supported photocatalytic material.
研究领域:
环境科学
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材料科学
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微生物学
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产品关联
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2013
·
IF 1.21
Qamar Subhani,Zhong-Ping Huang,Zuo-Yi Zhu,Lu-Ye Liu,Yan Zhu
This study describes a novel application of ion chromatography coupled with post-column photochemically induced fluorimetry derivatisation in alkaline medium and fluorescence detection (IC- hv -FD) for the determination of neonicotinoid pesticide, thiacloprid. In an aqueous medium, this compound showed fluorescence with an excitation maximum at 236 nm and an emission maximum at 353 nm. The 10 mmol/L NaOH with 10% (v/v) acetonitrile solution pumped at flow rate of 1.0 mL/min was used for the chromatographic elution to isocratically separate thiacloprid on an Ion Pac ® AS 11 (250 mm × 4 mm i.d; 13 μm particle size, Dionex) anion-exchange column. The linear concentration range of application was 0.04–10.0 mg/L, with a relative standard deviation (RSD, n = 7) of 1.7% (for a level of 2.0 mg/L) and detection limit (LOD, S / N = 3) of 9.9 μg/L. The procedure was applied with satisfactory results to the analysis of thiacloprid in ground and lake water samples. Pesticide average spiked recoveries ranged between 95.5% and 114.0%.
研究领域:
环境科学
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分析化学
·
农药研究
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DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Kun Wei,Weiming Xu,Qin Liu,Liyun Yang,Zhuo Chen
Traditional pesticide spraying methods such as knapsack sprayers are inefficient. Ground application equipment is restricted by the terrain and damages the crops. Pesticides cannot be sprayed over a large area in a short time; thus, when there are concentrated outbreaks of pests with strong migration capacity, such as Spodoptera frugiperda, pests could not be controlled in a small area. Therefore, it is difficult to achieve a satisfactory control effect. Plant protection unmanned aerial vehicles (UAVs) have high efficiency and spray pesticides at low altitude and can suitably prevent and control the outbreak of pests. However, pesticide formulations suitable for UAVs are rare. In this study, we developed ultralow-volume (ULV) sprays suitable for plant protection UAVs. We studied their properties and found that the ULV sprays have good wettability and can be fully spread. The minimum contact angle on corn leaves is up to 19°, and the maximum retention is 2.7 times that of the reference product. They also have superior resistance to rain washout and can effectively extend the duration and utilization of pesticides. When sprayed by plant protection UAVs, the decrease rate of the ULV spray at 3 L/ha to S. frugiperda larvae is 81.31% and the control effect is 83.01%, both higher than those of the reference product 40% chlorantraniliprole–thiamethoxam water-dispersible granules (decrease rate 67.39%, control effect 70.35%), sprayed with a knapsack sprayer.
研究领域:
农业科学
·
害虫防治
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DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Bin Yang,Jia Liu,Xin Liu,Shiyue Niu,Fengming Zhang,Yuting Wang,Daqian Song,Shuyun Bi
The high efficient surface-enhanced Raman scatterring (SERS) methods to detect thiacloprid and imidacloprid were established using ZIF-8-wrapped Ag nanoparticles (AgNPs) modified with β -cyclodextrin ( β -CD). The substrate of ZIF-8/ β -CD@AgNPs was characterized by ultraviolet visible spectra (UV–vis), thermogravimetric analysis (TGA), X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). The interaction between the substrate and thiacloprid/imidacloprid was also explored. The optimum measurement conditions were obtained by response surface model based on single-factor experiments. Enhancement factors (EFs) of thiacloprid and imidacloprid were respectively 2.29 × 10 6 and 2.60 × 10 6 . A good linearity between the scattering intensity and the concentration of thiacloprid/imidacloprid within 3–1000 nmol L −1 /6–400 nmol L −1 was established. The interference experiments indicated that the methods had good selectivity . The SERS methods were successfully applied to detect thiacloprid and imidacloprid in several vegetables samples. The recoveries ranged from 95.5 % to 105 % (n = 5). The detection limits (LODs) (S/N = 3) for thiacloprid and imidacloprid were 1.50 and 0.83 nmol L −1 , respectively.
研究领域:
分析化学
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环境科学
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食品安全
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产品关联
DOI
PubMed
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
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农业科学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Lijun Wang,Jing Cao,Zhenni Yu,Haixia Hu,Xiao Yang,Xianggui Chen
The newly established lower maximum residue limit (MRL) for thiamethoxam (TMX) necessitates the development of more sensitive detection methods. This study presents a novel colorimetric-fluorescence sensing platform to detect TMX through graphene quantum dot (GQD)-mediated regulation of Fe 3 O 4 @Cu@PLL nanozyme activity. The mechanism investigation revealed that GQDs effectively suppress the peroxidase-like activity of Fe 3 O 4 @Cu@PLL by reducing and scavenging hydroxyl radicals (•OH) generated during catalytic reactions, which constitutes the fundamental principle of the dual-mode detection strategy. The sensing system was constructed through the hybridization of aptamer-functionalized Fe 3 O 4 @Cu@PLL (Fe 3 O 4 @Cu@PLL/Apt) with complementary DNA strand-modified GQDs (CS-GQDs), forming Fe 3 O 4 @Cu@PLL/Apt-CS/GQDs complexes. Following magnetic separation, two distinct detection channels were established: (1) The supernatant showed negligible fluorescence due to CS-GQDs removal, while (2) the precipitates exhibited suppressed peroxidase-like activity owing to GQD-induced inhibition. However, TMX presence triggered the dissociation of CS-GQDs from the complexes through competitive binding with the aptamer. This resulted in two measurable signals: a fluorescence signal recovery at 450 nm in the supernatant containing CS-GQDs, and restored nanozyme activity in the Fe 3 O 4 @Cu@PLL/Apt+TMX precipitates that catalyzed H 2 O 2 -mediated oxidation of TMB to blue-colored oxTMB. The optimized system achieved detection limits of 8 ng/mL (colorimetric) and 6 ng/mL (fluorescence), demonstrating high sensitivity. Validation experiments using three spiked samples (tea, beans, and kumquats) showed satisfactory recoveries ranging from 94.59 % to 108.23 %, confirming the method's reliability for accurate, on-site TMX detection in food matrices.
研究领域:
分析化学
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食品安全
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纳米生物技术
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农药残留检测
·
分子识别
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Tongcai Liu,Danyu Zhang,Kai Yin,Chunping Yang,Shenglian Luo,John C. Crittenden
Unactivated peroxymonosulfate (PMS) degrading organic contaminants has been reported. Previous studies have focused on direct PMS oxidation, while the role of singlet oxygen ( 1 O 2 ) is often overlooked. Here, we studied the oxidation of thiacloprid (THIA) of the neonicotinoid insecticides by PMS without explicit activation. According to electron spin resonance spectroscopy and quenching experiments, the nonradical mechanism (i.e., direct PMS oxidation and 1 O 2 oxidation) was responsible for the THIA degradation. There are two pathways to generate 1 O 2 . The pyridine nitrogen of THIA structure can combine with PMS to produce epoxide , which is beneficial to generation of 1 O 2 . However, the contribution of 1 O 2 from PMS self-decomposition can be ignored. According to kinetic solvent isotropic effect analysis, the overall THIA degradation was attributed to 36.5% 1 O 2 oxidation and 63.5% direct PMS oxidation. A structure-activity assessment and density functional theory suggested that thioether sulfur, amidine nitrogen and the cyanoimino groups were the main reaction sites. Product analysis further confirmed the involvement of 1 O 2 and PMS. Moreover, three major THIA degradation pathways were proposed, including (i) heterolytic cleavage of peroxo bonds and transfer of oxygen atoms, (ii) electron transfer and (iii) oxidation of cyanoimino groups to generate nitroso/nitro-THIA. In addition, identification byproducts (Except for TP141) had lower ecotoxicity toxicity (using ECOSAR) in fish, daphnid and green algae. Effects of pH and natural water matrices on THIA oxidation via PMS were further evaluated. This study investigated the overlooked 1 O 2 oxidation reaction to elucidate the mechanism. The new mechanistic knowledge has important implications for other contaminants for their interactions with PMS.
研究领域:
环境科学
·
化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Zhen Zhong,Min Li,Jinghao Fu,Yuexin Wang,Yaseen Muhammad,Sihan Li,Jiaxing Wang,Zhongxing Zhao,Zhenxia Zhao
Cu 2 O/MIL(Fe/Cu) composite was fabricated via an in-situ Cu-bridging strategy to enhance interfacial synergistic effect of photo-Fenton catalysis for thiacloprid (TCL) degradation. Characterization results showed that: (1) Cu 2 O was proved to grow on the surface of MIL(Fe/Cu) in Cu 2 O/MIL(Fe/Cu) composite and display a high BET surface area of 1553 m 2 /g; (2) Cu 2 O/MIL(Fe/Cu) reduced band gap from 2.5 to 1.3 eV and extended absorption from UV to visible region; (3) Cu-bridge was proved to promote the intimate interface between Cu 2 O and MIL(Fe/Cu), which accelerated charge transferred and shortened the binding gap and the reaction pathway from photo-induced electrons to Fenton-generated radicals. As a result, this boosted the redox reaction of Fe 2+ /Fe 3+ and promoted the reversible degree of this catalytic redox ability of MIL(Fe). Catalytic performance exhibited that (1) Cu 2 O/MIL(Fe/Cu) showed a fast kinetics (2–40 times faster than the state-of-the-art catalysts) and ultra-high mineralization (82.3% within 80 min) for TCL degradation; (2) Cu 2 O/MIL(Fe/Cu) showed a promising cycling stability due to improved charge transfer ability that could protect Cu 2 O from photo-corrosion during photo-Fenton reaction; (3) The catalytic performance of Cu 2 O/MIL(Fe/Cu) was characterized and seven photocatalytic intermediates were identified by both HPLC/MS and Surface Enhanced Raman Spectroscopy. The cyanoimino group in TCL was proved for the first time to be attacked primarily. Moreover, among all the detected intermediates, thiazolidin-2-amine (P6) was found to be the most stable intermediate to be degraded, and it can directly influence the TOC determination during photodegradation process.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2020
·Vol. 18
·期 1
·1-14
·
IF 6.518
Su Chenyu,Liu Shanshan,Cao Shenghan,Yin Shuyan,Zhou Chenggang,Gao Shangkun,Jia Chunyan,Ji Yingchao,Liu Yanxue
Background Trunk-boring pests (TBPs) are an important type of forest pest, TBPs not only feed on the branches and trunks of trees, but also spread quarantine diseases in forests. However, because the larvae of TBPs live inside the trunk and are well concealed, prevention and control are difficult. The lack of effective control methods leads to the death of many trees in forests. In this study, a novel nanopesticide featuring high bioactivity and slow-release properties was developed to control TBPs. Thiacloprid (THI), which is commonly used to control Coleoptera species, was used as a model pesticide.Results The oleophobic properties of bovine serum albumin (BSA) were exploited to encapsulate the hydrophobic pesticide THI by self-assembly, and the size of the obtained nanoparticles, THI@BSA·NPs, was approximately 23 nm. The loading efficiency reached 70.4%, and THI@BSA·NPs could be released continuously for over 15 days, with the cumulative release reaching 93.5%. The fluorescein isothiocyanate (FITC)-labeled nanoparticles were evenly distributed in the digestive tract and body surface of a typical TBPs, M. alternatus, and the stomach and contact toxicities increased by 33.7% and 25.9%, respectively, compared with those of free THI. Furthermore, the results showed that the transport efficiency of THI@BSA·NPs was highest at a concentration of 50 μg/mL, and the THI@BSA·NPs content in the trunk, from to lower to higher layers, was 8.8, 8.2, 7.6, and 5.8 μg/g. At the same time, THI@BSA·NPs also exhibited high transport efficiency in dead trees.Conclusion The transport efficiency and toxicity of the active ingredients are the key factors for the control of TBPs. This work provided idea for the application of biological delivery system encapsulated hydrophobic pesticides. The novel self-assembled THI@BSA·NPs have promising potential for sustainable control of TBPs.
研究领域:
农业科学
·
纳米技术
·
害虫管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Shuhuai Li,Yan Deng,Chaohai Pang,Xionghui Ma,Yuwei Wu,Mingyue Wang,Jianping Li,Zhi Xu,Lianming Zhang
The performance of an electrochemiluminescent reagent directly affects the performance of its corresponding electrochemiluminescent (ECL) sensor. In this study, Fe/Zn-benzene-1,3,5-tricarboxylic acid metal–organic framework@C-dots (Fe/Zn-BTC@C-dots), which consist of a nano-loaded carbon quantum dot material with an excellent luminescence performance, were synthesised for the first time. Subsequently, they were used to modify the surface of a glassy carbon electrode, and combined with a single-chain thiamethoxam DNA aptamer to construct a biosensor. A novel method for the detection of thiamethoxam was established based on control of the excellent luminescence signal of the Fe/Zn-BTC@C-dots by specific recognition of the aptamer by the target molecule (a signal switch). Upon capturing thiamethoxam, the electrochemical luminescence intensity of the sensor was quenched. The ability of Fe/Zn-BTC to effectively catalyse and amplify the electrochemical luminescence of the C-dots significantly improved the sensitivity of the sensor, while the specific recognition of the target by the aptamer imparted the sensor with an excellent selection ability. Such an advanced approach is promising for the detection of thiamethoxam, with a linear range of 5–5000 × 10 −11 mol/L and a sensitivity of 9.81 × 10 −12 mol/L being achieved. Moreover, the sensor exhibited recovery rates of 90.5–109.3% upon the detection of thiamethoxam in actual samples.
研究领域:
分析化学
·
环境科学
·
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）