CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Bangyuan Song,Yifan Li,Fei Han,Yandong Lu
Membrane distillation (MD) shows great potential in hypersaline water treatment, but it is invariably constrained by temperature polarization. Conductive heating vacuum membrane distillation (CHVMD), a single-pass system without recirculating feed, effectively alleviates temperature polarization by introducing a thermal conducting layer that enhances the transfer of external heat to the membrane-water interface. However, this process exacerbates concentration polarization, raising the scaling potential. Gypsum scaling, a common issue in MD, has been effectively alleviated by using carboxyl antiscalants. However, the mechanisms by which different carboxyl antiscalants influence gypsum scaling in MD remain poorly understood. In this study, the performance and mechanism of three carboxyl antiscalants—polyacrylic acid (PAA), polymethacrylic acid (PMAA) and hydrolyzed polymaleic anhydride (HPMA)—in CHVMD using gypsum solution as the feed were investigated. The results show that these carboxyl antiscalants enhance the membrane durability in the single-pass CHVMD system, while improving both initial and stabilized flux in the order: PAA > HPMA > PMAA. PAA exhibits a more pronounced effect on reducing the evaporation enthalpy of water through the formation of intermediate water, and lowering the resistance to heat and mass transfer with the formation of vertical, large lamellar gypsum crystals, achieving an initial flux of 12.79 kg/m 2 h and a stabilized flux of 10.20 kg/m 2 h. For PMAA, increasing feed salinity significantly reduces the evaporation enthalpy, and lowers the transfer resistance by the formation of larger needle-like gypsum crystals, thereby obtaining the highest initial flux of 15.45 kg/m 2 h and stabilized flux of 11.35 kg/m 2 h.
研究领域:
环境工程
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水处理技术
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材料科学
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化学工程
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Xiaomei Chen,Jingchan Zhao
A simple and efficient method for the determination of five phenoxy carboxylic acid herbicides (PCAs) in environmental water samples was developed based on thermosensitive polymer assisted metal–organic framework as the adsorbent for micro-solid phase extraction. Under the optimized working conditions, the linearity was in the concentration ranges of 5–300 μg L −1 with a determination coefficient higher than 0.9980, respectively. The limits of detection and limits of quantification were in the range of 0.34–0.55 μg L −1 and 1.13–1.83 μg L −1 , respectively. The intra-day and inter-day precision were in the range of 0.7–3.4 % and 2.6–3.5 %, respectively. The method was applied successfully to analyze PCAs in environmental water samples. The satisfactory relative recoveries (92.7 %–117.8 %) for the spiked samples in environmental water samples were achieved which demonstrated the proposed method has a potential application for the trace determination of PCAs from complex matrix. Besides, the developed method is proved to be simple, environmentally friendly and inexpensive.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
Analytical Methods
·
2023
·Vol. 15
·期 41
·5483-5491
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IF 3.1
Shengyu Cao,Shanshan Huang,Chudi Yang,Lili Lian,Minhong Ren,Dazhi Sun
Phenoxy carboxylic acid (PCA) herbicides are commonly used herbicides that can easily accumulate in soil, groundwater, crops, and vegetable surfaces. Thus, they pose a serious risk to human health. Accurate detection of trace amounts of PCAs in various matrixes is crucial. Herein, ZIF-67-modified magnetic nanoparticles (MNPs, ZIF-67@Fe3O4) were prepared by growing ZIF-67 on the surface of Fe3O4 MNPs. The introduction of ZIF-67 improved the dispersion of Fe3O4 nanoparticles in water and enhanced their extraction performance for PCAs. When an eluent consisting of ammonia water and acetonitrile (5% : 95%; v/v) was employed, 10 mg of ZIF-67@Fe3O4 displayed optimal extraction performance for PCAs in a 20 mL sample solution at a pH of 3. We achieved a limit of detection ranging from 0.014 μg L−1 to 0.056 μg L−1 for four types of PCA herbicides by using the newly developed method. Notably, the values were considerably lower than the maximum concentration levels of PCAs in drinking water set by the Environmental Protection Agency. The relative recovery rate of PCAs using ZIF-67@Fe3O4 ranged from 83.75% to 117.07% when applied to river water and apple samples. These results demonstrate the great potential of ZIF-67@Fe3O4 in determining the residues of organic pesticides in real samples.
研究领域:
环境科学
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分析化学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2022
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IF 4.601
Xiaoning Di,Na Li,Meng-Jun Li,Xiaoli Wang,Hai-Long Jiang,Ling-Xi Zhao,Xiangfeng Chen,Jin-Ming Lin,Ru-Song Zhao
High-efficiency caption of pesticide residue is of vital significance for environmental safety monitoring. Herein, a hexagonal boron nitride nanosheets-based magnetic composite (Fe 3 O 4 @h-BNNSs) was synthesized and applied for the magnetic solid phase extraction (MSPE) of five phenoxy carboxylic acid (PCA) herbicides from water samples. Based on the π-π interaction, hydrogen bond and halogen bond, the Fe 3 O 4 @h-BNNSs composite showed excellent adsorption ability towards PCA herbicides. Several main variables that influenced the extraction efficiencies of PCA herbicides were investigated and optimized via single-factor experiment. Combining this Fe 3 O 4 @h-BNNSs composite-based MSPE with high-performance liquid chromatography-tandem mass spectrometry, a novel sensitive method for the analysis of PCA herbicides was developed. Under the most favorable conditions, the proposed method displayed good linear ranges (20.0-10000.0 ng L −1 ), low limits of detection (5.6-10.3 ng L −1 ), satisfactory precisions (1.1-6.8%) and recoveries (76.6-107.2%). Overall, the present work can be a versatile and worthy utility for the determination of PCA herbicides from different water samples.
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL PAPERS
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2022
·Vol. 76
·期 7
·4379-4392
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IF 2.146
Zhang Huixian,Hu Xizhou,Xia Hong,Zhou Youxiang,Peng Lijun,Wu Jianyuan,Peng Xitian
Phenoxy carboxylic acid herbicides (PCAs) are widely used in agricultural production. However, due to their potential threat to human health, it is necessary to develop efficient analysis method for monitoring PCA concentration in environment and food samples. Based on dispersive micro-solid phase extraction (D-μ-SPE) with amine-functionalized metal–organic framework MIL-101(Fe)-NH 2 , a selective, sensitive, and cost-efficient method was proposed for the extraction of PCAs from environmental water and rice samples in this study. From the perspective of adsorption kinetics and isotherms, interaction mechanisms between MIL-101(Fe)-NH 2 and PCAs were investigated. Key parameters of D-μ-SPE procedure including adsorbent dosage, solution pH, ionic strength, eluting solution, and washing solutions were optimized. Using of small amount of MIL-101(Fe)-NH 2 could achieve desirable extraction effect due to its large surface area and multiple interactions with PCAs. Under the optimized D-μ-SPE conditions, calibration curves of 8 PCAs were linear within a concentration range of 0.05–5 ng/mL for water samples ( r 2 > 0.9898) and 0.5–50 ng/g for rice samples ( r 2 > 0.9879). Limits of detection of water and rice samples were as low as 0.004–0.008 ng/mL and 0.05–0.1 ng/g, respectively. The recoveries of 8 PCAs ranged from 83.0 to 109.3%. Both inter- and intra-day relative standard deviations were less than 10.3%. Our proposed method was successfully employed in actual environmental water and rice samples.
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
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Gege Wu,Jiping Ma,Shasha Wang,Huining Chai,Liang Guo,Jinhua Li,Abbas Ostovan,Yafeng Guan,Lingxin Chen
A novel kind of cationic metal-organic framework(MOF) based mixed-matrix membrane(MMM) namely cationic MOF-MMM was firstly designed and used for simultaneous dispersive membrane extraction(DME) of six phenoxy carboxylic acid(PCA) herbicides from water samples followed by determination using ultrahigh-performance liquid chromatography tandem mass spectrometry. The cationic MOF-MMM was synthesized by soaking the zirconium-based MOFs in a polyvinylidene fluoride(PVDF) solution and further functionalization with quaternary amine groups, viz., UiO-66-NMe 3 + MMM. The well-prepared UiO-66-NMe 3 + MMM was characterized by FT-IR, SEM, XRD, XPS, NMR and etc. Several main variables influencing the MMM based DME efficiency were investigated and optimized in detail, such as dosage ratio of MOF/PVDF, solution pH, extraction time, coexistent anions and ionic strength. Electrostatic interactions dominated adsorption mechanism between anionic PCAs and cationic UiO-66-NMe 3 + MMM, along with π π conjugation and cation-π bonding, leading to better adsorption performance. Low limits of detection in the range of 0.03–0.59 ng/L and satisfactory recoveries within 80.06–117.40 % for all the PCAs are a reliable witness to demonstrate supreme sensitivity and the applicability of the developed method. By relying on the obtained results, the present work implied cationic MOF-MMM based DME can be a versatile and worthy utility for extraction of pollutants from different water samples with high throughput.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
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2020
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IF 6.306
Xucan Yuan,Yunxia Yuan,Xun Gao,Zhili Xiong,Longshan Zhao
A novel of magnetic dummy-template molecularly imprinted polymers (mag-MWCNTs-DMIPs) were prepared by surface molecular imprinting technique. The structure of polymers were characterized and the binding properties were assessed by adsorption experiments. The synthetic mag-MWCNTs-DMIPs exhibit satisfying adsorption capacity, excellent selectivity and fast adsorption rate toward phenoxy carboxylic acid (PCA) herbicides. Afterwards, a reliable analytical method for selective separation and determination of trace PCA herbicides in cereals was established by using magnetic solid-phase extraction (mag-MWCNTs-DMIPs as magnetic adsorbent) and UPLC-MS/MS detection. A series of requisite factors were optimized in detail to achieve expected extraction performance. Under the optimum MSPE parameters, the mean spiked recoveries for analytes in different cereals ranged from 86.7% to 95.2% with intra- and inter-day precision not greater than 8.5% and 10.6%, respectively. At last, the developed method was successfully utilized for determination the four PCA herbicides in actual cereals.
研究领域:
分析化学
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环境科学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2020
·
IF 4.192
Long Zhang,Ping Hang,Xi-Yi Zhou,Wen-Jing Qiao,Jian-Dong Jiang
Dichlorprop [(RS)-2-(2,4-dichlorophenoxy)propanoic acid; DCPP], an important phenoxyalkanoic acid herbicide (PAAH), is extensively used in the form of racemic mixtures (Rac-DCPP), and the environmental fates of both DCPP enantiomers [(R)-DCPP and (S)-DCPP] mediated by microorganisms are of great concern. In this study, a bacterial strain Sphingopyxis sp. DBS4 was isolated from contaminated soil and was capable of utilizing both (R)-DCPP and (S)-DCPP as the sole carbon source for growth. Strain DBS4 preferentially catabolized (S)-DCPP as compared to (R)-DCPP. The optimal conditions for Rac-DCPP degradation by strain DBS4 were 30 °C and pH 7.0. In addition to Rac-DCPP, other PAAHs such as (RS)-2-(4-chloro-2-methylphenoxy)propanoic acid, 2,4-dichlorophenoxyacetic acid, 4-chloro-2-methylphenoxyacetic acid, and 2,4-dichlorophenoxyacetic acid butyl ester could also be catabolized by strain DBS4. Bioremediation of Rac-DCPP-contaminated soil by inoculation of strain DBS4 exhibited an effective removal of both (R)-DCPP and (S)-DCPP from the soil. Due to its broad substrate spectrum, strain DBS4 showed great potential in the bioremediation of PAAH-contaminated sites.
研究领域:
环境微生物学
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生物修复
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化学生态学
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环境科学
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产品关联
DOI
PubMed
高影响因子
PHARMACOLOGICAL RESEARCH
·
2020
·
IF 5.893
Ruocong Yang,Hao Liu,Chen Bai,Yingchao Wang,Xiaohui Zhang,Rui Guo,Siying Wu,Jianxun Wang,Elaine Leung,Hang Chang,Peng Li,Tiegang Liu,Yi Wang
The Coronavirus Disease 2019 (COVID-19) pandemic has become a huge threaten to global health, which raise urgent demand of developing efficient therapeutic strategy. The aim of the present study is to dissect the chemical composition and the pharmacological mechanism of Qingfei Paidu Decoction (QFPD), a clinically used Chinese medicine for treating COVID-19 patients in China. Through comprehensive analysis by liquid chromatography coupled with high resolution mass spectrometry (MS), a total of 129 compounds of QFPD were putatively identified. We also constructed molecular networking of mass spectrometry data to classify these compounds into 14 main clusters, in which exhibited specific patterns of flavonoids (45 %), glycosides (15 %), carboxylic acids (10 %), and saponins (5 %). The target network model of QFPD, established by predicting and collecting the targets of identified compounds, indicated a pivotal role of Ma Xing Shi Gan Decoction (MXSG) in the therapeutic efficacy of QFPD. Supportively, through transcriptomic analysis of gene expression after MXSG administration in rat model of LPS-induced pneumonia, the thrombin and Toll-like receptor (TLR) signaling pathway were suggested to be essential pathways for MXSG mediated anti-inflammatory effects. Besides, changes in content of major compounds in MXSG during decoction were found by the chemical analysis. We also validate that one major compound in MXSG, i.e. glycyrrhizic acid, inhibited TLR agonists induced IL-6 production in macrophage. In conclusion, the integration of in silico and experimental results indicated that the therapeutic effects of QFPD against COVID-19 may be attributed to the anti-inflammatory effects of MXSG, which supports the rationality of the compatibility of TCM.
研究领域:
药理学
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医学
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中医药
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生物信息学
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分子生物学
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免疫学
✓ 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）