Catalysts
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2024
·Vol. 14
·期 2
·144
·
IF 3.8
Jingfei Luan,Yichun Wang,Ye Yao,Liang Hao,Jun Li,Yu Cao
Eu2SmSbO7and ZnBiEuO4were synthesized for the first time using the hydrothermal method. Eu2SmSbO7/ZnBiEuO4heterojunction photocatalyst (EZHP) was synthesized for the first time using the solvothermal method. The crystal cell parameter of Eu2SmSbO7was 10.5547 Å. The band gap width of Eu2SmSbO7was measured and found to be 2.881 eV. The band gap width of ZnBiEuO4was measured and found to be 2.571 eV. EZHP efficiently degraded the pesticide chlorpyrifos under visible light irradiation (VLID). After VLID of 160 min, the conversion rate of the chlorpyrifos concentration reached 100%, while the conversion rate of the total organic carbon (TOC) concentration was 98.02% using EZHP. After VLID of 160 min, the photocatalytic degradation conversion rates of chlorpyrifos using EZHP were 1.13 times, 1.19 times, and 2.84 times those using Eu2SmSbO7, ZnBiEuO4, and nitrogen-doped titanium dioxide (N-doped TiO2), respectively. The photocatalytic activity could be ranked as follows: EZHP > Eu2SmSbO7> ZnBiEuO4> N-doped TiO2. The conversion rates of chlorpyrifos were 98.16%, 97.03%, 96.03%, and 95.06% for four cycles of experiments after VLID of 160 min using EZHP. This indicated that EZHP was stable and could be reused. In addition, the experiments with the addition of capture agents demonstrated that the oxidation removal ability of three oxidation free radicals for degrading chlorpyrifos obeyed the following order: hydroxyl radical > superoxide anion > holes. This study examined the intermediates of chlorpyrifos during the photocatalytic degradation of chlorpyrifos, and a degradation path was proposed, at the same time, the degradation mechanism of chlorpyrifos was revealed. This study provides a scientific basis for the development of efficient heterojunction photocatalysts.
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 AGRICULTURAL AND FOOD CHEMISTRY
·
2019
·
IF 3.571
Xue Cao,Chenzhi Yan,Xuerui Yang,Lei Zhou,Wenjun Zou,Guangli Xiu
Contamination of the environment by toxic pesticides has become of great concern in agricultural countries. Chlorpyrifos (CP) is among the pesticides most commonly detected in the environment owing to its wide agricultural applications. The aim of this study was to compare potential changes in the toxicity of CP after irradiation. To this end, photolysis of CP was conducted under simulated sunlight, and neurotoxicity assessment was carried out at CP of 20 and 50 μg L–1 and its corresponding irradiated mixture solutions which contain a mixture of identified intermediates using the nematode, Caenorhabditis elegans as a model organism. Photodegradation of 20 μg L–1 CP for 1 h produced no obvious reduction of physiological damage, and more serious effects on animal movement were detected after exposure of the animals to a solution of 50 μg L–1 for 1 h irradiation compared with unirradiated solution. GABAergic and cholinergic neurons were selectively vulnerable to CP exposure, and maximal neuropathological alterations were observed after 1 h irradiation of the CP solutions in coherence with the behavioral impairment. The generation of photoproducts was considered to be responsible for the enhanced disturbance on those biological processes. This work provided useful information on the toxicological assessments of chemicals that were produced during the environmental transformation of pesticides.
研究领域:
环境科学
·
毒理学
·
生物学
✓ 已验证
DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2023
·
IF 6
Honglei Zhao,Ruotong Li,Jiye Hu
A large number of apples produced in China are consumed by people around the world every year. The pesticide residues in apples and apple juice are receiving more attention. Herein, 14 frequently used pesticides and 3 metabolites were selected as targets to investigate their residues in apples (120 samples) and apple juice (40 samples) in the markets across China, and the dietary intake risk for consumers was estimated. The monitoring results showed 91.7% of apple samples contained detectable pesticide residues, and six pesticides including thiamethoxam, carbendazim, pyraclostrobin, tebuconazole, chlorpyrifos and fenpyroximate exceeded limits of quantification with a detection rate of 63.3%, 61.7%, 22.5%, 21.7%, 8.3% and 2.5%, respectively. All pesticide residues were below their maximum residue limits (MRLs) in China. However, the banned pesticide chlorpyrifos in the Europe Union and the United States exceeded the local MRL (0.01 mg kg −1 ) in 7.5% of apples. No target chemicals occurred in juice samples. Risk assessment showed in deterministic assessment, the chronic and acute risk quotients of pesticides were ≤1.66 × 10 −1 % and 6.84%, respectively. The risk quotients of probability assessment were no more than 1.56%. The results indicated a negligible risk for consumers from consuming apples and apple juice from markets across China.
研究领域:
食品安全
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环境科学
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毒理学
✓ 已验证
产品关联
DOI
高影响因子
MARINE POLLUTION BULLETIN
·
2023
·
IF 5.8
Minggu Zhang,Na Liu,Lei Hou,Chao Li,Chengliang Li
Both non-degradable and biodegradable plastics can act as vectors of diverse organic pollutants. In this study, two types of biodegradable microplastics [poly (butylene adipate- co -terephthalate) (PBAT) and polylactic acid (PLA)] and one type of non-degradable microplastics [polypropylene (PP)] were selected to investigate the impacts of ultraviolet (UV) irradiation for one month on microplastics surface modification and their adsorption behaviors for chlorpyrifos (CPF). The study revealed that PBAT held the largest adsorption capacity, and PLA held the fastest adsorption rate. The UV irradiation diminished the adsorption capacities on PLA and PP but enhanced the adsorption capacities on PBAT. The adsorption capacity normalized by specific surface area revealed that specific surface area was the dominant factor for affecting the adsorption capacities on PP and PLA after UV irradiation. These findings further clarify the interaction between CPF and microplastics, and provide a theoretical basis for assessing the ecological risk of microplastics in water.
研究领域:
环境科学
·
生态学
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污染研究
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产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2024
·
IF 15.7
Heng Zhou,Rui Zhang,Caiyan Yue,Xu Wu,Qiong Yan,Hao Wang,Heng Zhang,Tianyi Ma
ABSTRACT As a green and efficient technology, photocatalysis has practical application value, especially in terms of remediating environmental contamination issues. Biochar, the carbon material derived from sustainable calcined biomass waste, has attracted attention for its efficient adsorption capacity for pollutants. Herein, nitrogen(N)-doped biochar is prepared from sawdust biomass and dexterously coupled with Bi 2 WO 6 to synthesize a range of Bi 2 WO 6 /N-doped biochar composites (BWO/N x -BC), which are successfully utilized for photodegradation of chlorpyrifos (CPs). After introducing N atoms, BWO/N3-BC improves conductivity of electrons while maintaining strong adsorption properties, effectively preventing the charge recombination. BWO/N3-BC demonstrates high efficiency in ultrafast photodegradation of recalcitrant pesticides, destroying 99.0% of CPs in only 0.5 h. Besides, the degradation rate constants are 2.91 and 12.13 times higher than those of pure BWO and N3-BC, respectively. Given the complexity of real water environments, the effects of different operating parameters on photocatalytic activity are explored. Free radical scavenging assay and electron paramagnetic resonance are employed to uncover the key active species (•O 2 – , •OH, and h + ), with •O 2 – being the predominant contributor, and the synergistic enhancement mechanism of adsorption-photodegradation of BWO/N3-BC is successfully revealed. Also, the intermediates of CPs are identified by HPLC-MS, and three possible degradation pathways are proposed. In addition, the ecotoxicity of CPs and their intermediates are evaluated by ecotoxicity test ( E. coli culture) and Toxicity Evaluation Software Tool. This work may provide an opening for environmental remediation via photocatalysis integrated with waste biomass high-value valorization.
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
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 12
·11549-11558
·
IF 2.741
Zhou Lei,Zhang Ya,Ying Rongrong,Wang Guoqing,Long Tao,Li Jianhua,Lin Yusuo
The widespread occurrence of organophosphorus pesticides (OPPs) in the environment poses risks to both ecologic system as well as human health. This study investigated the oxidation kinetics of chlorpyrifos (CP), one of the typical OPPs, by thermoactivated persulfate (PS) oxidation process, and evaluated the influence of key kinetic factors, such as PS concentrations, pH, temperature, bicarbonate, and chloride ions. The reaction pathways and mechanisms were also proposed based on products identification by LC-MS techniques. Our results revealed that increasing initial PS concentration and temperature favored the decomposition of CP, whereas the oxidation efficiency was not affected by pH change ranging from 3 to 11. Bicarbonate was found to play a detrimental role on CP removal rates, while chloride showed no effect. The oxidation pathways including initial oxidation of P=S bond to P=O, dechlorination, dealkylation, and the dechlorination-hydroxylation were proposed, and the detailed underlying mechanisms were also discussed. Molecular orbital (MO) calculations indicated that P=S bond was the most favored oxidation site of the molecule. The toxicity of reaction solution was believed to increase due to the formation of products with P=O structures. This work demonstrates that OPPs can readily react with SO 4
·− and provides important information for further research on the oxidation of these contaminants.
研究领域:
环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Feng Jiang,Wanqin Wu,Zhengwei Zhu,Songsong Zhu,Huixia Wang,Li Zhang,Zhiyong Fan,Yiping Chen
Chlorpyrifos (CPF) is an extensively used organophosphorus pesticide. Recently, it has attracted increasing attention due to environmental health problems caused by it. Although numerous studies have discovered the dechlorinated photoproduct of CPF, its structure and toxicity remain largely unknown. In this study, we systematically investigated the structure and toxicity of dechlorinated photoproduct of CPF. The CPF degradation experiment was performed, and its products were identified by ultra high performance liquid chromatography-orbitrap fusion tribid mass spectrometer (UHPLC-Orbitrap Fusion TMS). Additionally, bond dissociation energy (BDE) calculations and photoproduct chemical synthesis were employed to determine the structure of dechlorinated photoproduct of CPF. The toxicity of CPF photoproduct was evaluated through the Ecological Structure Activity Relationships (ECOSAR) Class Program, the Toxicity Estimation Software Tool (T.E.S.T.) software, and acute toxicity testing. The results indicated that the dechlorinated photoproduct of CPF was identified as O,O-Diethyl-O-(3,5-dichloro-2-pyridyl) phosphorothioate (Dechloro-CPF), which was produced in large quantity within the first 30 min of photodegradation experiment. The acute and chronic toxicity values of Dechloro-CPF were obviously higher than those for the other two photoproducts. The median lethal dose (LD 50 ) of Dechloro-CPF was 31.6 mg/kg for female mice and 58.4 mg/kg for male mice. This study reveals the photodegradation mechanism of CPF and confirms that Dechloro-CPF was dechlorinated photoproduct of CPF with potential acute toxicity to aquatic species and mammalian (including human). Our findings will contribute to a more comprehensive risk evaluation of CPF in food and the environment.
研究领域:
环境科学
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毒理学
·
农药研究
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产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Yan Qin,Tong An,Hao Cheng,Weihua Su,Guihua Meng,Jianning Wu,Xuhong Guo,Zhiyong Liu
Intelligent responsive pesticide delivery systems have been used in agricultural applications to improve pesticide utilization. To improve the bioavailability of pesticides for combating the growth of beet armyworm (which grows fastest at 35°C), we constructed a halloysite nanotubes (Hal)-based sustained release system with intelligent temperature-responsive release properties and strong adhesion to leaves. Hal, N -isopropylacrylamide (NIPAm), dopamine (DA, polydopamine is abbreviated as PDA) and chlorpyrifos (CPF) were used as the raw materials to prepare (PNIPAm- g -Hal)@CPF@PDA (PHCP). PHCP had excellent thermosensitive release performance, and the average release rate at 35°C was approximately 2.5 times higher than that at 25°C. Through a simulated rainwater scour experiment, the retention rate of PHCP on corn leaves was 83.52% (2.25 times higher than that of (PNIPAm- g -Hal)@CPF) (PHC). The continuous release time of CPF from PHCP was more than 60 h. PHCP improved the UV-shielding performance of CPF, and it took 12 times longer than the original CPF to reach the same degradation rate . This study demonstrates a strategy to design pesticide carriers according to the characteristics of the target, which is widely applicable to protect crops, improve the utilization rate of pesticides, and protect the environment.
研究领域:
农业科学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2025
·
IF 6.1
Jingchong Li,Wende Zheng,Jingkun Li,Komelle Askari,Zhixiang Tian,Aohui Han,Runqiang Liu
Chlorpyrifos (CHP) contamination affects agricultural land and poses significant risks to plants and humans. Chitosan-oligosaccharide (COS) enhances plant resilience under stress and boosts the activity of enzymes metabolizing exogenous substances. This study aimed to explore the potential and mechanism of COS in mitigating CHP phytotoxicity and reducing CHP accumulation through both pot and field experiments. The results indicated that CHP exposure caused oxidative stress and decreased photosynthesis by 18.5 % in wheat. COS up-regulated the expression of antioxidant enzyme genes in CHP-stressed plants, resulting in a 12.1 %-29.4 % increase in antioxidant enzyme activity, which resulted in an 11.3 %-12.8 % reduction in reactive oxygen species (ROS) and an 11.5 %-14.7 % reduction in malondialdehyde (MDA) content in leaves and roots, respectively. Additionally, COS increased chlorophyll content by 6.6 % by regulating genes related to chlorophyll metabolism, enhancing photosynthesis by 13.6 %. COS also reduced CHP uptake and accelerated its metabolism by upregulating CYP450 , GST , and lignin biosynthesis-related genes. Wheat treated with COS exhibited a 26.7 %-28.7 % reduction in grains' CHP content, resulting in a lower health risk index (HRI). These findings provide novel insights into the potential of COS in alleviating CHP phytotoxicity and reducing its accumulation.
研究领域:
植物学
·
环境科学
·
农业科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yiting Yang,Huimin Jia,Gaotian Bian,Xianmin Zeng,Peilong Shi,Shunan Lu,Mengkai Jiang,Weiwei He
Chlorpyrifos (CPF) is one of the representative organophosphorus pesticides (OPs) that posing huge risks to both human health and ecological integrity. Building a highly sensitive detection platform to achieve accurate detection of trace CPF is of vital importance for real-time evaluation of environmental and food safety. In this work, a novel organic photoelectrochemical transistor (OPECT) with TiO 2 /CdS heterojunction serving as the photogating module against the (3,4-ethylenedioxythiophene) poly (styrenesulfonate) (PEDOT:PSS) channel was developed for the high sensitive and selective detection of CPF. The TiO 2 /CdS heterojunction significantly improves the light absorption and charge separation efficiency of gate (G), and drives the directional migration of cations in the electrolyte to the channel under light conditions, reducing the channel carrier concentration. The C=N and P=S in CPF chelate with cadmium (Cd) ions, blocking the electron transfer between electron donor and gate, resulting in changes in effective gate voltage, which in turn leads to changes in channel current, and realizing highly sensitive and specific detection of CPF. The platform demonstrated a good linear response in the detection range of 100 ng/mL to 0.1 pg/mL, with detection limit as low as 2.2 fg/mL. This work provides an efficient and sensitive detection platform for the design of novel organic photochemical transistors for the detection of low concentration organophosphorus pesticides.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 9
·646
·
IF 3.8
Jingfei Luan,Yang Xiao,Liang Hao,Ye Yao,Bowen Niu,Guangmin Yang,Yichun Wang
For the first time, a novel catalyst named Dy2EuSbO7was successfully synthesized via the high-temperature solid-state sintering method (HTSSM). Dy2EuSbO7/ZnBiDyO4heterojunction photocatalyst (DZHP) was fabricated through the HTSSM for degrading chlorpyrifos (CPS) in the pesticide wastewater under visible light irradiation (VSLID). Under VSLID, DZHP could effectively degrade CPS in pesticide wastewater. The experimental outcomes suggested that the kinetic curve with the Dy2EuSbO7/ZnBiDyO4heterojunction (DZH) as a photocatalyst for the reduction of CPS under VSLID conformed to the first-order kinetics (FOKT). After VSLID of 156 min, the photocatalytic degradation (PTD) removal rate of CPS using DZH as photocatalyst was 1.12 times, 1.21 times, or 2.96 times that using Dy2EuSbO7as a photocatalyst, ZnBiDyO4as a photocatalyst, or nitrogen-doped titanium dioxide as a photocatalyst. After VSLID of 156 min for four cycle degradation tests (FCDTS) with DZH as a photocatalyst, the removal rate of CPS reached 98.78%, 97.66%, 96.59%, and 95.69%, respectively. Above results indicated that the DZHP possessed high stability. Experiments with the addition of trapping agents showed that hydroxyl radicals (•OH) owned the strongest oxidative removal ability for degrading CPS compared with superoxide anions (•O2−) or holes (h+). The oxidation capacity of three oxidation radicals for eliminating CPS was ranked in the ascending order as follows: h+< •OH < •O2−. Lastly, the possible degradation pathway and degradation mechanism of CPS were discussed in detail. A visible light responsive heterojunction catalyst with high catalytic activity and a photocatalytic reaction system which were capable of efficiently removing toxic organic pollutants from pesticide wastewater were obtained.
研究领域:
环境科学
·
催化材料科学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Zhijiao Tang,Zhengyi Chen,Gongke Li,Yuling Hu
The development of sensitive fluorescence sensors and efficient preparation of samples is a challenge in the detection of pesticides in complex samples. In this study, multicolor nitrogen dots (M-Ndots) were synthesised via microwave irradiation at 140 °C for 10 min with 5-amino-1H-tetrazole and p-phenylenediamine as precursors, which have a high fluorescence quantum yield of up to 31%. Furthermore, the M-Ndots were employed as fluorescence sensors for pesticide detection by being combined with a gas membrane separation device, to eliminate the interference from the complex sample matrix. In this process, the M-Ndots were used for sensing thiram and chlorpyrifos through their affinities to Cu 2+ and Fe 3+ , respectively. Because thiram could decompose into volatile CS 2 , its derivate was sensed using the fluorescence of M-Ndots via a complexation reaction with Cu 2+ . Chlorpyrifos, due to its volatility, can reduce the Fe 3+ ion by inhibiting the activity of acetylcholinesterase , which produces H 2 O 2 to oxidise Fe 2+ . In a real application, the time consumption for 96 samples was less than 30 min in one run of the gas membrane separation device. The recoveries for thiram and chlorpyrifos ranged from 90.0% to 115.0%, and the analytical results were validated using LC-MS/MS methods, with relative errors ranging from −7.4% to 10.1%.
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
危险品化学品经营许可证（带存储）