ADSORPTION SCIENCE & TECHNOLOGY
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2018
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IF 0.609
Liyun Yang,Xiaoming Qian,Zhi Wang,Yuan Li,Hao Bai,Hong Li
This study investigates the removal effectiveness and characteristics of phenanthrene and naphthalene using low-cost steel slag with batch experiments. The adsorption characteristics of steel slag were measured and analysed using X-ray fluorescence, X-ray diffraction, and Fourier transform infrared spectroscopy. The batch experiments investigated the effect of the time gradient, pH, and steel slag dosage gradient on the adsorption of the steel slag. The results show that with time and dosage of steel slag increased, the adsorption capacity of phenanthrene and naphthalene increased and gradually became balanced, but pH had no obvious effect on the adsorption of phenanthrene and naphthalene. The Langmuir isotherm model best describes the phenanthrene and naphthalene removal by the steel slag, which shows the adsorption occurring in a monolayer. The maximum adsorption capacity of the steel slag to phenanthrene and naphthalene is 0.043 and 0.041 mg/g, respectively. A pseudo-first-order kinetic model can better represent the adsorption of phenanthrene and naphthalene by steel slag. The research demonstrates that the steel slag has a certain adsorption capacity for phenanthrene and naphthalene.
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ANALYTICA CHIMICA ACTA
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2018
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IF 5.123
Yinhui Yang,Zhengfeng Chang,Xiaohong Yang,Meiling Qi,Jinliang Wang
Herein we report a propeller-like hexaphenylbenzene-based hydrocarbon material (denoted as BT) as the stationary phase for capillary gas chromatography (GC). The statically-coated BT capillary column showed a high column efficiency of 4340 plates m −1 and weak polarity. Owing to its unique conformation, π-electron toroidal delocalization and intrinsic microporosity , the BT stationary phase exhibited interesting selectivity for aromatic compounds over alkanes. Compared with the graphene (G) column, the BT column showed much prolonged retention and high selectivity for aromatic isomers, especially methylnaphthalenes , dimethylnaphthalenes and phenanthrene/anthracene, mainly because of its propeller-like conformation with rich intercalation effects. Moreover, it exhibited good column repeatability (intra-day, inter-day) and reproducibility (between-column) with RSD values on the retention times less than 0.08% for intra-day, 0.32% for inter-day and 3.8% for between-column, respectively. Also, it showed good potential for determination of minor isomer impurities in real samples. To the best of our knowledge, this work presents the first example of employing an neat aromatic hydrocarbon material as the GC stationary phase with high selectivity for analytes of a wide ranging polarity.
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JOURNAL OF CHROMATOGRAPHY A
·
2018
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IF 3.716
Tianfu Wei,Zhengyi Chen,Gongke Li,Zhuomin Zhang
Aflatoxins are highly toxic mycotoxin contamination, which pose serious food safety incidents. It is very important to precisely and rapidly determine trace aflatoxins in food. In this study, we designed porous monolithic column based on covalent cross-linked polymer gels for online extraction and analysis of trace aflatoxins in food samples with complicated matrices coupled with high-performance liquid chromatography-ultraviolet detector (HPLC-UV). The prepared monolithic column showed excellent enrichment performance due to its good permeability, good reproducibility and long life span. The study of adsorption mechanism suggested that the excellent enrichment performance of this monolithic column was attributed to the multiple effect of π-π stacking interaction, hydrophobic effect and steric effect. When the online analytical method was applied for the determine of trace aflatoxins in real food samples, aflatoxins G 1 and aflatoxins B 1 could be actually found in one positive bean sauce sample and quantified to be 32.8 and 26.4 μg/kg, respectively. Aflatoxins G 1 in one bean sample could be also found and quantified to be 25.9 μg/kg. The low detection limits of the developed method were achieved in range of 0.08-0.2 μg/kg. And the recoveries for spiked samples were in range from 76.1 to 113% with RSDs of 1.1-9.6%. The developed method was proved to be a promising method for online enrichment and analysis of trace aflatoxins in complicated food samples.
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FOOD CHEMISTRY
·
2024
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IF 8.5
Shenling Wang,Xiaofeng Hu,Wenqin Wu,Du Wang,Peiwu Li,Zhaowei Zhang
The coexistence of multiple contaminates in the environment and food is of growing concern due to their extremely hazard as a well-known class I carcinogen, like aflatoxin B1 (AFB1) and benzo(α)pyrene (BaP). AFB1 and BaP are susceptible to coexistence in environmental water and edible oil , posing a significant potential risk to environmental monitoring and food safety. The remaining challenges in detecting multiple contaminates include unsatisfied sensitivity, insufficient targets selectivity , and interferences in complex matrices. Here, we developed dual-template magnetic molecularly imprinted polymers (DMMIPs) for selective extraction of dual targets in complex matrices from the environment and food. The DMMIPs were fabricated by surface imprinting with vinyl-functionalized Fe 3 O 4 as carrier, 5,7-dimethoxycoumarin and pyrene as dummy templates, and methacrylamide as functional monomer . The DMMIPs showed excellent adsorption ability (12.73–15.80 mg/g), imprinting factors (2.01–2.58), and reusability of three adsorption-desorption cycles for AFB1 and BaP . The adsorption mechanism including hydrogen bond , electrostatic interaction and van der Waals force was confirmed by physical characterization and DFT calculation. Applying DMMIPs in magnetic solid phase extraction (MSPE) followed by high-performance liquid chromatography (HPLC) analysis enabled detection limits of 0.134 μg/L for AFB1 and 0.107 μg/L for BaP. Recovery rates for water and edible oil samples were recorded as 86.2%–110.3% with RSDs of 4.1%–11.9%. This approach demonstrates potential for simultaneous identification and extraction of multiple contaminants in environmental and food.
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GREEN CHEMISTRY
·
2024
·Vol. 26
·期 6
·3211-3220
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IF 9.3
Pengfei Li,Yehong Han,Dandan Han,Hongyuan Yan
An innovative solid-phase microextraction (SPME) fiber coating, melamine–formaldehyde resin (MFR), was synthesized with a green cross-linker (paraformaldehyde), and it exhibited high heat resistance (up to 350 °C). Seven polycyclic aromatic hydrocarbons (PAHs) were chosen as analytes, and the results demonstrated the MFR-based SPME fiber's exceptional enrichment capabilities and efficient extraction, with high enrichment factors and significantly improved efficiency compared to the conventional polydimethylsiloxane (PDMS) fibers. The unique superiority of the MFR was attributed to its strong π–π interactions and amino-associated enhancement, as well as its porous structure and rough surface, which provided abundant adsorption sites and facilitated rapid mass transport of analytes. Furthermore, the preparation conditions of the MFR-coated SPME fiber were compared with those of commercially available and reported fibers, emphasizing the advantages of the MFR-coated fiber, such as its simplicity, cost-effectiveness, reproducibility, and eco-friendliness. The MFR-based SPME fiber exhibited significant advantages, including high enrichment factors (ranging from 1906- to 7153-fold) for PAHs and good fiber-to-fiber reproducibility (8.7–14.6%), outperforming commercially available PDMS fibers by a factor of 4.9–82.8-fold. This study also considered important factors affecting the extraction process, such as ionic strength, temperature, and time, and optimized these parameters for the best extraction efficiency. The greenness of the developed method was assessed using the Analytical Eco-Scale, and the results showed that it was green in terms of reagent dosage, energy consumption, and waste. The developed headspace solid phase microextraction–gas chromatography–tandem mass spectrometry (HS-SPME-GC-MS/MS) method based on the MFR coating exhibited excellent precision, accuracy, and repeatability, making it a reliable method for the determination of trace PAHs in environmental water samples.
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FOOD CHEMISTRY
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2024
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IF 8.5
Hua Wang,Lin Hao,Yaxing Guo,Chun Wang,Qiuhua Wu,Zhi Wang
Porous electron-rich organic frameworks have attracted an increased attention in the adsorption and removal of pollutants due to their abundant electron-rich nitrogen atoms, which can effectively interact with positively charged substance. In this study, a porous electron-rich organic framework (Car-POF) and positively charged amino-functionalized magnetic nanoparticles (Fe 3 O 4 -NH 2 ) were used to construct a magnetic electron-rich Fe 3 O 4 -NH 2 @Car-POF for the enrichment of some phenylurea herbicides from water and milk samples prior to high performance liquid chromatographic detection. The adsorption capacity of Fe 3 O 4 -NH 2 @Car-POF for the phenylureas ranged from 14.93 to 28.83 mg g −1 . The LODs were observed in the range of 0.05–0.20 ng mL −1 and 0.5–1.5 ng mL −1 , and LOQs in the range of 0.17–0.66 ng mL −1 and 1.7–5.0 ng mL −1 for water and milk samples with RSD less than 9.0. The adsorption studies with cationic and anionic dyes revealed that Fe 3 O 4 -NH 2 @Car-POF is favorable for the adsorption of positively charged compounds.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Guijiao Zhao,Chenhuan Wang,Min Kang,Lin Hao,Weihua Liu,Zhi Wang,Xiaodong Shi,Qiuhua Wu
Developing effective methods for highly sensitive detection of phenolic endocrine disruptors (EDCs) is especially urgent. Herein, a magnetic hydroxyl-functional porous organic polymer (M-FH-POP) was facilely synthesized by green diazo-couple reaction using basic fuchsin and hesperetin as monomer for the first time. M-FH-POP delivered superior adsorption performance for phenolic EDCs. The adsorption mechanism was hydrogen bonds, hydrophobic interaction and π-π interplay. With M-FH-POP as adsorbent, a magnetic solid phase extraction method was established for extracting trace phenolic EDCs (bisphenol A, 4- tert -butylphenol, bisphenol F and bisphenol B) in water and fish before ultra-high performance liquid chromatography tandem mass spectrometry analysis. The method displayed low detection limit (S/N = 3) of 0.05–0.15 ng mL −1 for water and 0.08–0.3 ng g −1 for fish. The spiked recoveries were 88.3 %–109.8 % with the relative standard deviations of 2.4 %–6.4 %. The method offers a new strategy for sensitive determination of phenolic EDCs in water and fish samples.
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MICROCHIMICA ACTA
·
2024
·Vol. 192
·期 1
·1-11
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IF 5.3
Zhou Binbin,Li Xinyi,Xie Hao,Sheng Xingxin,Huang Lijun,Zhu Yongbo,Liang Meng,Zhong Ming
A novel molecular-imprinted electrochemical sensor for 3,4-benzopyrene (3, 4-BaP) in food samples, with high sensitivity and selective detection, is introduced. Firstly, graphene oxide was modified onto a glassy carbon electrode (GCE) by electroreduction deposition to form an RGO/GCE sensing platform, thereby enhancing the sensitivity and stability of the sensor. Then, magnetic molecularly imprinted polymer-zeolite imidazole framework-8 (MMIP-ZIF-8) was synthesized in one step using the crystal growth method and modified onto RGO/GCE, endowing the sensor with good adsorption capacity and selectivity. The performance of the sensor for 3, 4-BaP was studied using differential pulse voltammetry (DPV), and the detection conditions of the constructed sensor were optimized. The results showed that under the optimal conditions, the constructed sensor exhibited a wide linear range (0.5 ~ 1000 nmol L −1 ), a low limit of detection (0.16 nmol L −1 ), and good selectivity and stability for the detection of 3, 4-BaP. It also showed a good recovery (99.74 ~ 102.58%) for the detection of 3, 4-BaP in actual corn meal samples. The MMIP-ZIF-8/RGO/GCE sensor developed has potential application prospects in the precise detection of 3, 4-BaP in food. Graphical
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MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Jian Wei,Jianjun Sun,Yucui Hou,Zhuosen He,He Li,Shuhang Ren,Weize Wu
The structural analysis of lignin is highly significant in practical terms. We investigated the presence of fused aromatic multirings (FARs) distinct from conventional phenylpropane units in seven lignin types using synchronous fluorescence spectroscopy (SFS) and quantified their relative proportions. Our findings reveal that FARs are present in all lignin samples, primarily composed of 2–6 rings. The relative distribution of FARs in lignin is ranked as follows: 2 rings > 1 ring > 4 rings > 3 rings > 6 rings > 5 rings. The relative contents of these FARs (1–6 rings) exhibit slight variations across all lignin samples. Notably, FARs with 2 rings are the highest at 35 %−53 %, while those with 5 and 6 rings are the lowest, collectively accounting for less than 1.37 %. Moreover, the relative contents of FARs with 1 and 2–6 rings range approximately 24 %−32 % and 68 %−76 %, respectively. Furthermore, the catalytic hydro-depolymerization of lignin was performed and the experimental results demonstrate that the hydro-liquefied oil from lignin contains aromatic compounds with 1–7 rings, and the relative contents of aromatic compounds with 1 ring and 2–7 rings in the oil are 29 % and 71 %, respectively, which is consistent with that of lignin SFS. These findings are also consistent with the existing literature and experimental results. This study offers an explanation for the low yields observed in current depolymerization processes targeting small molecules within lignin and establishes a theoretical foundation for achieving high yields in the preparation of multiring aromatic hydrocarbons.
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Min Sun,Jiaqing Feng,Yang Feng,Xubo Xin,Yali Ding,Juanjuan Feng
Background Because of the advantages of good selectivity , high sensitivity, and fast analysis, high performance liquid chromatography (HPLC) has become one of the modern analytical techniques in wide application range, such as biological analysis, environmental detection, pharmaceutical and food inspection, agriculture and other fields. The stationary phase greatly decides the chromatographic separation performance, so the development of novel stationary phase is most important for HPLC. Results Pyridyl conjugated microporous polymers (P-CMP) with one to four layers were modified on the surface of amino silica to obtain a novel core-shell material (SiO2@P-CMP) by the layer-by-layer assembly strategy and Chichibabin reaction . The relationship between the structure of SiO2@P-CMP and chromatographic performance was carefully investigated, and the retention mechanism was revealed. The interactions including π-π stacking, hydrophobic effect and hydrogen bond gradually enhanced with the increase of P-CMP layers on the silica surface. Compared with C18 column, SiO2@P-CMP columns displayed better separation selectivity for polycyclic aromatic hydrocarbons (PAHs). According to the relative retention values ( α ), the separation performance of SiO2@P-CMP columns ( α = 1.144–1.884) for PAH isomers and other analytes was obviously better than that of C18 column ( α = 0.998–1.487). Furthermore, the SiO2@P-CMP column with four layers was selected to separate different types of analytes (eight PAHs, four bisphenols , four estrogens and nine phthalates), and the peak order of analytes was different from that on the C18 column due to the influence of hydrogen-bonding and π-π interactions. The relative standard deviations (n = 10) of retention time and peak area on SiO2@P-CMP column were between 0.28 % and 1.98 %. Significance and novelty Pyridyl conjugated microporous polymer was introduced as the stationary phase for the first time in HPLC. The proposed column displayed better separation characteristics compared to Zorbax SB-C 18 column. It provided a new idea for the separation of small molecules and the development of chromatographic packing or extraction material.
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CHEMICAL ENGINEERING SCIENCE
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2024
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IF 4.1
Xiangyang Liu,Yue Pan,Yichen Huang,Yubin Li,Qianqian Wang,Sha Li,Li Qiu,Ruifeng Li,Xiaoliang Yan
Simultaneous hydrogenation of polycyclic aromatic hydrocarbons and sulfur contaminates (dibenzothiophene, DBT) in coal tar remains a challenge for energy utilization and environmental remediation. Herein, Ni 3 Zn/ZnO–Al 2 O 3 catalysts with different ZnO loading were prepared for deep hydrogenation of phenanthrene (PHE) and synchronous removal of DBT in a fixed-bed reactor. Compared to Ni/Al 2 O 3 , the optimal Ni 3 Zn/ZnO–Al 2 O 3 exhibited superior catalytic performance of 100.0% PHE conversion and 92.5% perhydrophenanthrene selectivity with 100.0% DBT conversion at 300 °C under 6 MPa for 10 h in a fixed-bed reactor. The kinetic study for PHE hydrogenation and mechanism for DBT hydrodesulfurization on Ni catalysts were discussed. Electron transfer from Zn to Ni over the active sites weakened DBT adsorption rather than PHE adsorption. The strong interactions between Ni 3 Zn and ZnO–Al 2 O 3 supports facilitated sulfur migration from the alloy to intimate ZnO, preventing the deactivation of Ni active centers by sulfur deposition and poisoning.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Liuyuan Tang,Jing Yang,Xiaona Liu,Lingke Kang,Wenjun Li,Ting Wang,Tianwei Qian,Bo Li
Microorganisms capable of simultaneously remediating heavy metals (HMs) and polycyclic aromatic hydrocarbons (PAHs) pollution hold significant importance in bioremediation efforts. In this study, we investigated the ability of Pseudomonas aeruginosa AO-4 to simultaneously degrade phenanthrene (PHE) and reduce Cr (VI). Specifically, it has the ability to reduce 100 % of Cr (VI) (30 mg/L) while degrading 43.8 % of PHE (50 mg/L). In batch experiments, it was observed that the presence of Cr (VI) can enhance the degradation of PHE by strain AO-4. The solubility of PHE in soluble extracellular polymeric substances (S-EPS) was found to be related to the initial concentration of Cr (VI), which could explain why Cr (VI) promotes the degradation of PHE. Additionally, XPS analysis confirmed that Cr (VI) was reduced to Cr (III) with S-EPS produced by Pseudomonas aeruginosa AO-4. GC–MS analysis was conducted to analyze the degradation metabolites of phenanthrene, di(2-ethylhexyl) phthalate and 2TMS derivatives of salicylic acid were detected, indicating that Pseudomonas aeruginosa AO-4 is capable of degrading phenanthrene through two distinct pathways. These findings demonstrate the potential of Pseudomonas aeruginosa AO-4 in the treatment of co-contamination scenarios involving PAHs and HMs.
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