Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Chao Kong,Caiyun Zhang,Rongfang Yuan,Tianci He,Huilun Chen,Beihai Zhou
The improvement in the degradation efficiency of dimethoate was achieved through the activation of UV light and metal ions . The study found that Fe(VI) was effectively activated by Cu(II), Fe(III), and Fe(II), resulting in an improved removal rate of dimethoate in water, with the activation efficiency of Cu(II) > Fe(III) > Fe(II). Under UV irradiation , the synergistic activation effects of UV-Cu(II) and UV-Fe(III) were most pronounced and positively correlated with light intensity. The mineralization rate of dimethoate by UV-Fe(III)-Fe(VI) reached up to 37 %, significantly outperforming the Cu(II)-Fe(VI) system. The main active species in the Cu(II)-Fe(VI) and Fe(III)-Fe(VI) systems were Cu(III) and Fe(IV)/Fe(V), while those in the UV-Fe(III)-Fe(VI) were ·OH and ·O 2 - radicals, respectively. In the UV-metal ions activated Fe (VI) system, the main degradation mechanisms of dimethoate were hydrolysis, cleavage, oxidation , and recombination. The impacts of water quality parameters on degradation efficiency were also investigated, finding that Cl - had almost no effect , while SO 4 2- had a slight repression effect, and HCO 3 - , CO 3 2- and NO 2 - exhibited strong inhibitory effects. Finally, the promising application of the UV-metal ion-Fe(VI) system in actual water environments was proposed, achieving effective removal with minimal environmental risks.
研究领域:
环境科学
·
化学
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DOI
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Fan Gao,Lanlan Yang,Jianguo Tang,Zhonglin Du,Yao Wang,Zhongyi Hu,Dongni Han,Linjun Huang,Laurence A. Belfiore
Pesticide residues in farm products create human health hazards. Hence, sensors that detect their existence are advantageous to address this critical problem. In this research contribution, fin-like CdSeS nanoplatelets were synthesized from solution by adjusting the selenium-to-sulfur molar ratio. Structural and photophysical properties were characterized via XPS, XRD, UV absorption, and fluorescence emission. CdSeS nanoplatelets exhibit a regular fin-like structure when the molar ratio of selenium-to-sulfur is 1:1. Fluorescence emission from these nanoplatelets occurs at two distinct wavelengths, characteristic of quantum dots. CdSeS fin-like nanoplatelets generate red-shifted fluorescence to 530 nm, which is useful to detect the popular organophosphorus pesticide dimethoate effectively at concentrations that range from 10–5 to 10–7 mol/L. Upon increasing dimethoate concentrations in solution, fluorescence intensity of CdSeS nanoplatelets decreases. Hence, direct sensing of dimethoate is feasible. Another important significance of this work is the use of low-toxicity and recyclable cadmium acetate instead of cancer-causing and nonrecyclable cadmium oxide, which will be helpful to reduce environmental pollution.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
FOOD CHEMISTRY
·
2017
·
IF 4.529
Ruyan Hou,Mengmeng Tong,Wanjun Gao,Lei Wang,Tianxi Yang,Lili He
To investigate the degradation and penetration behaviors of the organophosphate insecticide dimethoate applied on spinach leaves, in situ SERS and LC-MS methods were used to detect dimethoate residue on&in spinach leaves picked on different days after treatment (DAT). The SERS and LC-MS methods determined that the dimethoate degradation rate followed first-order kinetics, with a half-life of 3.56 or 4.13 days, depending on the respective method. The correlation coefficient of quantification value of these two methods was 0.9562. With the SERS method, we detected most of the penetrated dimethoate in the depth of 60–110 μm. With the LC-MS method, we detected dimethoate up to 0.17 ng in leaves and that the dimethoate on:in ratio of spinach leaves ranged from 562.25 on 0 DAT to 5.23 on 14 DAT. The combination of these two methods facilitated a better understanding of the behavior and biological fate of pesticides in a complex biological system.
研究领域:
植物学
·
农药科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Xiangqiang Zhan,Yue Tang,Yuanyuan Liu,Han Tao,Yuangen Wu
Although many colorimetric methods have been established for pesticide analysis, most of them rely on inhibiting catalytic activities of natural enzymes or nanozyme , easily leading to false positives in results of pesticide detection. Herein, a simple, stable, and rapid colorimetric method was firstly proposed to detect pesticide residues in vegetables based on enhancing the oxidase-mimicking activity of cube-shape Ag 2 O. The experiments, including fluorescence probe, electrochemistry , free radical tracking and enzymatic kinetics, confirmed that dimethoate could promote electron transfer from Ag 2 O to dissolved oxygen and accelerate the release of·O 2 - radicals as well as 1 O 2 , facilitating the catalytic oxidation of the chromogenic substrate. The colorimetric method exhibited satisfactory sensitivity with the limit of detection as low as 14 μg·L −1 . Moreover, such method showed excellent selectivity against other competitive pesticides, and achieved good recovery in several typical vegetables, which indicate that such strategy has a bright application prospect in the field of pesticide detection in food.
研究领域:
食品科学
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分析化学
·
环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Kunyu Chen,Zhanguo Cui,Zhiqiang Zhang,Heliang Pang,Jing Yang,Xiaojiang Huang,Jinsuo Lu
The present study developed a prolonged oxidizable sulfur(IV)/ferrate(VI) system for the generation of hydroxyl radical ( OH) and sulfate radical (SO 4 − ) within 120 min, and proposed a reaction mechanism. In the presence of H + in solution, the S(IV)/Fe(IV) system provided excellent oxidation performance of refractory organics O,O-dimethyl-S-methylcarbamoyl methyl phosphorothioate (dimethoate, a widely used organophosphorus pesticide) within 120 min. The degradation efficiency of dimethoate in the bisulfite/Fe(VI) system (e.g., 90.06% dimethoate) was higher than that in the sulfite/Fe(VI) system (e.g., 51.03% dimethoate), while Fe(VI) alone degraded 27.81% of dimethoate. In the S(IV)/Fe(VI) system, the active species consisted of Fe(VI) (including the highly-reactive iron-based intermediate species, i.e. Fe(V) and Fe(IV)), OH and SO 4 − , with OH being identified as the main active species, contributing more than half of the total. The degradation mechanism of dimethoate in the S(IV)/Fe(VI) system mainly included the cleavage of the S-P bond, C-S bond and the oxidation of the P = S bond. Two plausible degradation pathways were proposed based on the detected transformation products. Dimethoate could be efficiently degraded when the [bisulfite]/[Fe(VI)] molar ratio was 4:1 with a low Fe(VI) dosage (218 µM), the changes in HA and HCO 3 − concentrations affected the transformation of dimethoate, the presence of Cl − , SO 4 2− and NO 3 − had a negligible effect, and the S(IV)/Fe(VI) system performed well in real waters. The S(IV)/Fe(VI) system has excellent oxidation performance for the removal of organic pollutants in water, with a final pH (pH = 6.6) close to neutral and ultimate products of SO 4 2− and Fe(OH) 3 , which has great potential for engineering applications.
研究领域:
环境科学
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水处理技术
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Shuibing Wang,Zhizhang Shen,Junxian Gao,Yiqun Qiu,Ji Li,Zhenyu Wang,Jinze Lyu
Phosphorus shortage and pollution are two significant societal and environmental problems for human beings. Thus, this study presents a novel process to efficiently recover phosphorus from dimethoate-containing wastewater on the basis of a three-dimensional hierarchically porous carbon (3D HPC) material. The shape and size of the 3D HPC can be easily controlled by using polyurethane sponges as templates. The 3D HPC absorbed more than 80% of dimethoate at the initial concentration of 100 mg·L −1 . A total of 90.8% of the absorbed dimethoate was desorbed and mineralized to phosphate by cathodic regeneration employing 3D HPC as cathode in alkaline solution, combined with UV radiation and ozonation . The adsorption capacity and dimethoate-to-phosphate conversion efficiency remained 94.5% and 103.6%, respectively, after seven adsorption-regeneration cycles. Moreover, our study of the co-existing substances showed that they slightly competed with dimethoate. The recovery efficiency of phosphate in the regeneration solution reached 99.8% simply by adding CaCl 2 to form calcium phosphate precipitation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
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IF 4.6
Weidong Qin,Hongyuan Tian,Xinyi Feng,Zhanqiu Tang
Fluorescent nanozymes represent a class of dual-functional nanomaterials that exhibit inherent enzyme-like catalytic properties alongside fluorescent emission, making them suitable for multiple detection applications. However, the number of publications on this subject is limited, primarily due to potential interference between the two processes. In this study, oxidase-like fluorescent iron and copper codoped carbon dots (Fe,Cu-CDs) were synthesized via a one-pot pyrolysis reaction. The results demonstrated that the carbon dots could catalyze the oxidative coupling reaction between phenol and 4-aminoantipyrine, while their fluorescence emission was enhanced upon coordination with thiol compounds. By integrating the dimethoate-mediated, acetylcholinesterase-catalyzed hydrolysis of thiocholine, a dual-detection platform was developed for the colorimetric detection of phenol and the fluorometric detection of dimethoate, achieving detection limits of 0.103 μM and 1.94 × 10 −5 µg/mL, respectively. This method was subsequently applied to detect these two pollutants in real water and vegetable samples, and the results demonstrated favorable recovery rates and good reproducibility. This work not only presents a novel strategy for the synthesis and application of dual-functional carbon dots in pollutant analysis but also offers new insights into the design of dual-functional carbon dots for efficient and cost-effective multidetection.
研究领域:
纳米材料科学
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环境分析化学
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生物传感
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2019
·Vol. 11
·期 41
·5337-5347
·
IF 2.378
Yang Hu,Jinlong Wang,Yuangen Wu
The convenient detection of organophosphorus pesticides like dimethoate generally depends on the inhibitory effect of natural enzymes, which is especially susceptible to the surrounding conditions and will lead to some unreliable results. This paper reports a colorimetric chemosensor for the simple and rapid detection of dimethoate pesticide in agricultural products. The chemosensor mainly relies on the inhibition of the peroxidase-mimicking catalytic activity of gold nanoparticles (AuNPs). The nanoparticles coupled with hydrogen peroxide can oxidize substrate o-phenylenediamine (OPD) to generate the final product of 2,3-diaminophenazine, which has a characteristic absorption peak at 450 nm and displays a yellow color. In the presence of dimethoate, the catalytic activity of AuNPs is strongly inhibited, resulting in the appearance of light yellow or even colorless solutions. To improve the performance of the current chemosensor, several important parameters such as pH, and the concentrations of substrates and AuNPs have been investigated. Under the optimal catalytic conditions, the catalytic kinetics of peroxidase-mimicking AuNPs is extensively investigated, and it is found that the catalytic reaction conforms to the “ping pong” mechanism. The addition of dimethoate can lead to the decrease in Km and Vmax values of the mimetic enzymes, suggesting that the peroxidase-like activity of AuNPs will be inhibited in an anticompetitive manner. The proposed chemosensor can detect dimethoate in a linear range from 10 μg L−1 to 400 μg L−1, with a limit of detection (LOD) as low as 4.7 μg L−1 and exhibits excellent selectivity against other competitive pesticides. Moreover, the current chemosensor can generate sensing signals in a short time, which enables it to detect dimethoate pesticide quickly. Further research has revealed the accuracy and reliability of the proposed chemosensor in actual sample detection, which indicates that such a chemosensor will play a potentially vital role in the monitoring of agricultural and food products.
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
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Wen Jiang,Jia Zheng,Jian Su,Yue Tang,Yuangen Wu,Yating Cao,Wentao Cao
Colorimetric methods have the benefits of rapid detection and easy operation in dimethoate (DMT) analysis. However, the existing colorimetric sensor for DMT detection still face challenges in terms of performance stability and result reliability of sensing materials. Bimetallic Ag 2 CrO 4 nanoparticles (NPs) have been found to have both oxidase-mimic and laccase-mimic catalytic activities. DMT has opposite effect on the above dual-enzyme-mimic activities, which can enhance oxidase-mimic activity while inhibiting laccase-mimic activity of Ag 2 CrO 4 NPs. Therefore, a novel colorimetric sensor was constructed using the dual-enzyme-mimic activities as a sensing signal for rapidly detecting DMT in vegetables. The concentration of DMT is directly correlated with the absorbance change of the sensing solution, and the color change is further integrated with the smartphone to enable quantitative measurement of DMT. The limits of detection were as low as 8.7 μg L −1 in the oxidase-mimic channel and 10.9 μg L −1 in laccase-mimic channels. Besides, the colorimetric sensor has shown marked preference in selectivity over other competing pesticides, and obtained relatively preferable recovery rates in some vegetables, indicating that the established sensor has a wide range of potential applications in the area of vegetable pesticide detection.
研究领域:
分析化学
·
食品安全
·
纳米技术
·
农药检测
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Yilong Yan,Yijing Gao,Haiyang Zheng,Bowen Yuan,Qiaoqiao Zhang,Yu Gu,Guilin Zhuang,Zhongzhe Wei,Zihao Yao,Xing Zhong,Xiaonian Li,Jianguo Wang
OH radicals produced via an eco-friendly O 3 decomposition reaction in water are employed in a wide range of applications. In this work, three-dimensional (3D) β-PbO 2 /Ta 2 O 5 and Pt/Ta 3 N 5 samples with a rod-like morphology were successfully fabricated and coupled to carry out electrochemical ozone production (EOP) and hydrogen evolution reaction (HER), respectively. Moreover, the results on the in-situ electrodegradation of dimethoate also indicate that the β-PbO 2 /Ta 2 O 5 NRs show a great potential to be used in advanced oxidation processes (AOPs) applications. Experimental results and theoretical calculations reveal that the excellent EOP performance of the β-PbO 2 /Ta 2 O 5 NRs can be attributed to the adsorption energy of the O species, which can be modulated via the synergic effect between β-PbO 2 and Ta 2 O 5 . This work provides a reference for the development of stable electrocatalysts with high efficiency for the simultaneous production of O 3 and H 2 in environmental applications and energy conversion.
研究领域:
电化学
·
环境科学
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材料科学
·
能源转换
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）