ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Zihang Zeng,Bingni Jia,Xiaofeng Liu,Lixiang Chen,Peng Zhang,Taiping Qing,Bo Feng
The presence of microplastics in the ecological environment, serving as carriers for other organic pollutants , has garnered widespread attention. These microplastics exposed in the environment may undergo various aging processes. However, there is still a lack of information regarding how these aged microplastics impact the environmental behavior and ecological toxicity of pollutants. In this study, we modified polystyrene microplastics by simulating the aging behavior that may occur under environmental exposure, and then explored the adsorption behavior and adsorption mechanism of microplastics before and after aging for typical triazine herbicides. It was shown that all aging treatments of polystyrene increased the adsorption of herbicides, the composite aged microplastics had the strongest adsorption capacity and the fastest adsorption rate, and of the three herbicides, metribuzin was adsorbed the most by microplastics. The interactions between microplastics and herbicides involved mechanisms such as hydrophobic interactions, surface adsorption, the effect of π-π interactions, and the formation of hydrogen bonds . Further studies confirmed that microplastics adsorbed with herbicides cause greater biotoxicity to E. coli . These findings elucidate the interactions between microplastics before and after aging and triazine herbicides. Acting as carriers, they alter the environmental behavior and ecological toxicity of organic pollutants, providing theoretical support for assessing the ecological risk of microplastics in water environments.
研究领域:
环境科学
·
生态学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Xiao-Ting Zhen,Yan Chen,Juan Yang,Xin Dong,Hui Zheng,Jun Cao
A fast, simple, environmentally friendly and sensitive on-line concentration method using microemulsion system as background solution (BGS) was developed for the trace detection of propazine, atrazine, simazine in food samples. The electrokinetic injection assisted micelle to cyclodextrin stacking (MCDS) was designed for the enrichment of target compounds. The factors affected enrichment performance, such as the kind of CDs, the amount of CDs, the concentration of methanol in BGS, the concentration of micelle in sample matrix, the concentration of phosphoric acid in BGS and the sample injection time were optimized. The optimized electrophoretic condition was obtained as following: 50 mM α-CD, 20 mM SDS in sample matrix., 80 mM PA and 20% MeOH (v/v) in BGS, sample solution by electrokinetic injection at -10 kV for 80 s. Under the optimized conditions described above, the linear range was 0.1–20 ug/mL with a good linear relationship with a correlation coefficient (r) ≥ 0.9985. The SEFs for the propazine, atrazine, simazine were found to be 123, 85 and 62 respectively. The proposed MCDS-MEEKC method provided an efficient method for trace analysis of triazine herbicides in honey and dendrobium officinale samples.
研究领域:
分析化学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2016
·Vol. 39
·期 23
·4585-4591
·
IF 2.741
Xinpei Li,Shigang Wei,Ying Sun,Qun Sun,Li Liang,Bo Zhang,Huilan Piao,Daqian Song,Xinghua Wang
A novel and simple supported ionic-liquid-based solid-phase extraction method for the determination of triazine herbicides in rice was developed. Glass slides were functionalized by an ionic liquid, 1-carboxyethyl-3-methylimidazolium chloride, and were used for the simultaneous extraction of seven triazine herbicides in rice samples. The effects of the type of extraction solvent, the extraction time, the type and volume of loading solvent, and the type of eluting solvent on the extraction efficiency were investigated and optimized. Under the optimum operation conditions, the limits of detection for seven triazine herbicides in rice samples obtained by high-performance liquid chromatography were 3.16–5.42 ng/g, which were lower than the maximum residue levels established by various organizations. The linear correlation coefficients were higher than 0.9975 in the concentration range of 0.015–1.08 μg/g for the seven triazine herbicides. The recoveries of the seven triazine herbicides at the two concentration levels of 0.15 and 0.45 μg/g are between 82.47 and 104.21%, with relative standard deviations of 0.69–9.19%. The intra- and inter-day ( n = 5) precisions for all triazine herbicides at the spiked level of 0.30 μg/g were 1.72–11.71%.
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
TALANTA
·
2014
·
IF 3.511
Zeying He,Peng Wang,Donghui Liu,Zhiqiang Zhou
In this study, a novel hydrophilic–lipophilic balanced magnetic nanoparticle , magnetic poly(divinylbenzene-co-N-vinylpyrrolidone) (HLB-MPNP) was successfully synthesized and applied for the extraction and determination of triazine and organochlorine pesticides in environmental water samples. The specific ratio of two monomers , hydrophilic N-vinylpyrrolidone and lipophilic divinylbenzene, endowed the magnetic nanoparticles with hydrophilic–lipophilic balanced character, which made it capable of extracting both polar and nonpolar analytes. The experimental parameters affecting extraction efficiency, including desorption conditions, sample pH, sample volume and extraction time were investigated and optimized. Under the optimum conditions, good linearity was obtained in the range of 0.20–10 μg L −1 for triazine herbicides and 5.0–100 ng L −1 for organochlorine pesticides, with correlation coefficients ranging from 0.994 to 0.999. The limits of determination were between 0.048 and 0.081 μg L −1 for triazine herbicides and 0.39 and 3.26 ng L −1 for organochlorine pesticides. The proposed method was successfully applied in the analysis of triazine and organochlorine pesticides in environmental water samples (ground, river and reservoir).
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2022
·
IF 5.477
Hailin Zhu,Jianhua Liu,Xiaomeng Lu,Dehua Wang,Tao Geng,Li Feng,Dong Liang,Xuemei Ma,Zhiyong Hu
Background Epoxy coatings usually have cavities and defects, leading to their anticorrosion properties reduced significantly. The purpose of this paper is to improve the hydrophobic properties of epoxy coatings to obtain good corrosion resistance. Methods A superhydrophobic hybrid epoxy coating (SHEP) with excellent anticorrosive performance was prepared by the combination of internal modification of mesoporous molecular sieve loaded with triazine corrosion inhibitor and external superhydrophobic surface modification. The surface topography, wettability, and anticorrosion efficiency for prepared coating have been analyzed through scanning electron microscopy measurement (SEM), atomic force microscopy measurement (AFM), contact angle test, and electrochemical impedance spectroscopy measurement (EIS). Significant findings The water contact angle of SHEP coating is 169.3°, and the roll angle is less than 1°. The surface of SHEP remains superhydrophobic after immersing in strong acidic or alkaline solution for 6 h. Compared with pure epoxy resin coating (EP), the |Z| 0.01 Hz of SHEP is bigger than two orders of magnitude, demonstrating good corrosion resistance.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2020
·
IF 4.032
Quan Wu,Jia Guo,Bin Fei,Xinjian Li,Jun Sun,Xiaoyu Gu,Hongfei Li,Sheng Zhang
A novel polyhydroxy triazine-based charring agent, N-tris(hydroxymethyl)-amino triazine-piperazine copolymer (TTPC), was synthesized from piperazine, cyanuric chloride and tris(hydroxymethyl) aminomethane. The chemical structure of TTPC was characterized by Fourier transform infrared spectroscopy and 13 C solid-state nuclear magnetic resonance. TTPC, ammonium polyphosphate (APP) and zinc borate (ZB) were then introduced into polypropylene (PP) by melt compounding to improve the fire performance of the composites. The test results showed that the presence of 21% APP-TTPC-ZB with mass ratio of 16:4:1 could significantly reduce the peak heat release rate from 1547 to 230 kW/m 2 , increase the limiting oxygen index value from 18.0 to 29.6% and upgrade the UL-94 rating from no rating to V-0, accompanied by the elimination of melt dripping. The thermal stability and charring behaviors of the composite samples were investigated by thermogravimetric analysis . The results showed that TTPC was a highly efficient charring agent, and ZB could act as synergist in the intumescent system. Based on the comprehensive study of fire performance, char morphology and mechanical properties, it can be concluded that TTPC is a superior charring agent, especially compared with the generally used pentaerythritol.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Renjing Zhang,Yanjian Wan,Jiali Peng,Gang Yao,Yunhong Zhang,Bo Lai
In this study, LaCoO 3 /Al 2 O 3 (LCA) was utilized as a heterogeneous catalyst to activate peroxymonosulfate (PMS) to degrade atrazine (ATZ). The structural properties of the catalysts were characterized by SEM, EDS, XRD, XPS and TPD. The effects of some key parameters (i.e., loadings of LCA, ATZ concentration, catalyst dosage, PMS concentration, initial pH and coexisting ions) were optimized. In addition, under the optimal conditions of 100 mg/L 23LCA, 100 mg/L PMS and initial solution pH 6.8, the removal rate and mineralization efficiency of ATZ (5 mg/L) reached 100% and 30.8%, respectively. The superiority of the 23LCA/PMS system was verified by two controlled experiments. After three cycles of experiments, the degradation effect of ATZ was within an acceptable range. The degradation intermediates of ATZ were detected by UPLC-QTOF-MS/MS, and the possible degradation pathway of ATZ was proposed. In addition, the presence of SO 4 − and HO was identified by quenching experiments and SO 4 − was verified as the predominant radical. Finally, based on the comprehensive analysis, a reasonable reaction mechanism of the 23LCA/PMS system was proposed. In a word, these results indicate that LCA can act as a highly efficient heterogeneous catalyst to activate PMS to degrade ATZ in water.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2019
·
IF 5.399
Gaigai Li,Xufeng Meng,Junmin Wang,Qianqian Wang,Junhong Zhou,Chun Wang,Qiuhua Wu,Zhi Wang
In this study, a porous organic polymer (denoted as Car-DMB) was fabricated by a simple one-step crosslinking polymerization of carbazole and p -dimethoxybenzene for the first time. Then the Car-DMB was served as adsorbent of solid phase extraction to enrich triazine herbicides from white gourd, tomato and soybean milk samples prior to their determination by high performance liquid chromatography. Under the optimal conditions, the response linearity was in the range of 0.3–100.0 ng g −1 for white gourds and tomato samples, and 0.5–100.0 ng mL −1 for soybean milk, with the coefficient of determination higher than 0.996. The detection limits were 0.1–0.2 ng g −1 for white gourd and tomato samples, and 0.15–0.3 ng mL −1 for soybean milk. The adsorption mechanism of the Car-DMB for the triazines was attributed to the strong H-bonding and weak π-π interactions. The efficient extraction for several other compounds demonstrated that Car-DMB holds great potential for diverse analysis applications.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE SCIENCES
·
2012
·
IF 1.856
Chunjing Zhang,Jinlong Yan,Chunxiao Zhang,Zhengpeng Yang
TiO 2 film imprinted by atrazine molecule at the surface of quartz crystal was prepared using molecular imprinting and surface sol-gel process. The molecularly imprinted TiO 2 film was characterized by scanning electron microscopy and cyclic voltammetry , and the atrazine adsorption was investigated by quartz crystal microbalance (QCM) technique. In comparison with non-imprinted TiO 2 film, the molecularly imprinted TiO 2 film exhibits high selectivity for atrazine, better reversibility and a much higher adsorption capacity for the target molecule, the adsorption equilibrium constant estimated from the in situ frequency measurement is about 6.7 × 10 4 M −1 , which is thirteen times higher than that obtained on non-imprinted TiO 2 film.
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
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Liwei Chen,Xiaoxin Hu,Ying Yang,Canlan Jiang,Cheng Bian,Chao Liu,Miaoyue Zhang,Tianming Cai
The occurrence of s -triazine herbicides in soils and groundwaters has been reported globally and remediation of these contaminated sites are essentially imperative, especially at accidental spill sites. Present work investigated the feasibility of using Fe 2+ catalyzed persulfate (PS) to effectively degrade s -triazine herbicides (e.g., atrazine (ATZ), terbuthylazine (TEA) and ametryn (AMT)) in soils. The degradation kinetics, mechanisms and soil-types effects were systematically investigated. For arable soil A1, extent of degradation reached 80% for 100 mg kg −1 ATZ contaminated soil after 600 min (PS/Fe 2+ of 16.6 mM/16.6 mM) at 23 °C. Increasing PS and Fe 2+ dosages could enhance ATZ degradation. Acidic condition was favorable for the degradation of ATZ with Fe 2+ /PS process and the contribution of SO 4 − to the overall degradation of ATZ decreased as initial pH increased. The ethyl group and chloride substituent on molecular structure of ATZ affected its degradation comparing to other two s -triazine herbicides. ATZ degradations in two arable soils and one paddy soil indicated that different soils with various physical-chemical properties, such as soil organic matter, available and total Fe contents, may influence the ATZ degradation. Moreover, a total of five degradation products of ATZ were identified in soil A1 by Fe 2+ /PS process. Three degradation pathways including alkyl chain oxidation, dealkylation and dechlorination-hydroxylation reactions with the underlying oxidation mechanisms were tentatively proposed.
研究领域:
环境科学
·
土壤修复
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 40
·期 14
·2992-2998
·
IF 2.557
Xinpei Li,Ying Sun,Qun Sun,Li Liang,Huilan Piao,Yanxiao Jiang,Aimin Yu,Daqian Song,Xinghua Wang
Zinc oxide nanoparticles have recently been used as effective adsorbent materials for sample pretreatment in analytical chemistry because of their excellent properties, such as high specific surface area, high effective porosity, non-toxicity, and ease of fabrication. In this study, the zinc oxide nanoparticles functionalized by an ionic liquid, 1-carboxyethyl-3-methylimidazolium chloride, were fabricated and used as the adsorbent for the solid phase extraction of five triazine herbicides in corn for the first time. High-performance liquid chromatography was employed for the determination of these triazine herbicides. Several experimental parameters affecting the extraction efficiency were investigated, including the volume of extraction solvent, the extraction time, the type of extraction solvent and elution solvent, the amount of absorbent, and the volume of elution solvent. By using the proposed method, low limits of detection and quantification for all the five triazine herbicides were obtained between 0.71–1.08 and 2.67–3.64 ng/g, respectively. Recoveries of the proposed method range from 89.05 to 100.33% with intra- and inter-day relative standard deviations lower than 8.45%. The calibration curves are linear in the concentration range of 0.005–1.00 μg/g with the correlation coefficient higher than 0.9954.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 21
·9114-9120
·
IF 1.821
Mingzhu Hu,Lijie Wu,Ying Song,Zhanchao Li,Qiang Ma,Hanqi Zhang,Ziming Wang
Microwave-assisted liquid–liquid microextraction based on solidification of floating organic droplet (MA-LLME-SFO) was first developed and applied to the extraction of triazines in honey samples. 1-Dodecanol, which is of low toxicity, low density and has an appropriate melting point near room temperature, was chosen as the extraction solvent. Furthermore, traditional organic dispersive solvents were avoided in this method with the aid of microwave irradiation. Several experimental parameters, including the type and volume of extraction solvent, microwave power and irradiation time, pH of the sample solution, ionic strength and centrifugation rate were investigated and optimized. The proposed method showed a good linearity within the range of 5.00–250.00 μg kg−1 with the correlation coefficients ranging from 0.9994 to 0.9998. The limits of detection for cyanazine, desmetryn, terbuthylazine and dimethametryn were 1.39, 0.95, 1.20, and 1.07 μg kg−1, respectively. The recoveries of the analytes ranged from 74.84 to 112.74% and the relative standard deviations were lower than 13.10%, when the present method was applied to the analysis of real samples.
研究领域:
分析化学
·
食品科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）