ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 27
·7857-7864
·
IF 3.125
Li Chunying,Ma Xiaoguo,Zhang Xiaojun,Wang Rui,Chen Yuan,Li Zhongyang
Novel magnetic molecularly imprinted polymer nanoparticles (MMIPs) were synthesized by surface imprinting technology with a sol–gel process, using di(2-ethylhexyl)phthalate (DEHP) as the template. The MMIPs were characterized using Fourier transform–infrared spectroscopy (FT–IR), transmission electron microscopy (TEM), and vibrating sample magnetometry (VSM). The MMIPs displayed good adsorption selectivity for DEHP, with selectivity coefficients of 5.2 and 4.8 with respect to di- n -octyl phthalate and dibutyl phthalate, respectively. The reusability of MMIPs was demonstrated for at least eight repeated cycles without significant loss in adsorption capacity. A novel method for selective preconcentration and determination of trace DEHP in aqueous solutions was developed by using the magnetic DEHP-imprinted nanoparticles as adsorbent for solid-phase extraction (SPE) coupled with gas chromatography–mass spectrometry (GC–MS). The optimum SPE conditions were as follows: adsorbent amount, 50 mg; sample volume, 100 mL; adsorption time, 20 min; eluent, chloroform; and desorption time, 5 min. Results showed that the limit of detection (LOD) and limit of quantification (LOQ) for DEHP were 0.02 and 0.075 μg L −1 , respectively. The proposed method was applied to the determination of DEHP in different real water samples, with spiked recovery of 93.3–103.2 % and RSD of 1.2–3.2 %. Therefore, the developed analytical method is rapid, sensitive, and accurate, which provides a new option for the detection of trace DEHP in aqueous samples.
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JOURNAL OF CHROMATOGRAPHY A
·
2013
·
IF 4.612
Zhanqi Gao,Yuehua Deng,Xiaobin Hu,Shaogui Yang,Cheng Sun,Huan He
A simple, low-cost and sensitive method for determining organophosphate esters (OPEs) in water samples has been developed based on headspace solid-phase microextraction (SPME) followed by gas chromatography-flame photometric detector. The ionic liquid (1-allyl-3-methylimidazolium tetrafluoroborate, [AMIM][BF 4 ])-based coating was developed by sol–gel technology and employed for extracting analytes. The prepared coating performed stably at high temperatures (up to 335 °C) and with a range of solvents. It can be used at least 200 times without an obvious decrease in extraction efficiency. The extraction capability of the new fiber was much higher than polydimethylsiloxane (PDMS), polydimethylsiloxane/divinylbenzene (PDMS/DVB) and polyacrylate (PA) fibers. The experimental parameters that influenced the extraction efficiency, including extraction time, extraction temperature, stirring rate and ionic strength were investigated and optimized. Under the optimal conditions, the method detection limits (S/N = 3) were in the range of 0.7–12 ng L −1 , and the limits of quantification (S/N = 10) were between 1.0 and 28 ng L −1 . The repeatability of a single fiber varied from 3.3 to 7.6% (intra-day precision, n = 6) and 4.3 to 8.9% (inter-day precision, n = 6). The reproducibility of fiber-to-fiber ( n = 6) was in the range of 3.1–9.4%. The proposed method was applied successfully for the determination of OPEs in lake water, wastewater, sewage treatment plant effluent, and tap water with recoveries varying from 75.2 to 101.8%. The results demonstrate that the proposed method is highly effective for analyzing OPEs in water samples.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yalin Niu,Peng Jiang,Tianying Guo
Organophosphate nerve agents (OPs) are widely used as pesticides and chemical agents and pose a threat to human health and life. At present, most personal protective equipment usually only serves as physical protection and does not have an effect of chemical detoxification. In this work, ultra lightweight graphene oxide aerogels (GAs) have been used as a multifunctional skeleton to integrate the metal–organic frameworks (MOFs) and molecularly imprinted polymers (MIPs) together for obtaining a high-performance hybrid material (MOFs/MIPs@GAs) on hydrolysis detoxification of OPs. As a porous three-dimensional material full of carboxyl groups, GAs can not only support excellent mass transfer performance but also provide a proper pH self-buffering catalytic reaction external environment for hydrolyzing OPs. The obtained MOFs/MIPs@GAs can catalyze dimethyl-4-nitrophenyl phosphate (DMNP) hydrolysis detoxification rapidly in pure water (kobs = 0.2227 min–1, t1/2 = 3.11 min). This ternary hybrid material with exceptional performance and practical applicability has vast application prospects for the development of protective equipment.
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ACS Omega
·
2024
·
IF 3.7
Xiaoying Ji,Jia Guo,Bingbing Zeng,Xiaopeng Li,Xue Liao,Wanjiao Fang,Juan Liu,Yu Zheng,Dongliang Li,Jinshan Lei
Sustainable poly(lactic acid) (PLA)/poly(propylene carbonate) (PPC) blends were compatibilized by the environmentally friendly epoxidized soybean oil (ESO) through the chemical reaction of epoxy functional groups on ESO with the terminated carboxyl and hydroxyl groups of PLA/PPC. The compatibilization effect of ESO was confirmed by Fourier transform infrared spectroscopy, rheological property testing, differential scanning calorimetry, and morphological observations. It was revealed that the molecular chain entanglement between PLA and PPC was significantly enhanced and the dispersed PPC phase size was decreased, which endowed the blend with high viscosity modulus, low tan δ, and great stretchability, especially for the blend containing 1.0 wt % ESO. The compatibilization effect dramatically reinforced the toughening modification of PPC on PLA, resulting in a great ductility with a fracture strain up to 187.3%, more than 20 times that of the pristine PLA, while maintaining a high strength of 44.5 MPa. Compared to the neat PLA and the PLA/PPC blend, the compatibilized blend showed a much larger draw ratio of up to 6.5 × 6.5 during biaxial stretching, producing a uniform film with balanced mechanical properties, high optical transparency, and good oxygen barrier performance. This work will be of vital importance for guiding the preparation of PLA-based films with superior comprehensive properties.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhikun Wang,Zhihua Zhao,Chen Chen,Guixin Jin,Xiaoqing Shen,Zhigang Shao,Lan Wu
Environmental safety monitoring has significantly benefited from the incorporation of gas sensors. Given the pernicious effects of ammonia and acetic acid gases on the environment and human health, it is imperative to develop a room temperature dual-functional gas sensor capable of simultaneously detecting both these gases. In this research endeavor, acid-functionalized multi-walled carbon nanotubes (f-MWCNTs) were integrated with Bi 2 S 3 through a hydrothermal approach, leading to the fabrication of a Bi 2 S 3 /f-MWCNTs-2 nanocomposite-based chemoresistive gas sensor. The results demonstrate that the Bi 2 S 3 /f-MWCNTs-2 sensor exhibits a response value of 52.7 % towards 100 ppm NH 3 at room temperature (25℃), displaying a declining resistance curve upon exposure to the target gas. Similarly, for 100 ppm CH 3 COOH under ambient conditions (25℃), the sensor records a response value of 72.55 %, accompanied by a rising resistance curve when in contact with CH 3 COOH gas. The distinctive feature of this dual-functional sensor lies in its ability to detect opposing transient response curves for the two gases, which is crucial for distinguishing between different gases. Furthermore, the sensor boasts swift response recovery, excellent repeatability, and robust stability. This study underscores the promising potential of the Bi 2 S 3 /f-MWCNTs-2 nanocomposite sensor in applications such as environmental monitoring.
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JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Di Chen,Man-Yu Zhang,Xin-Miao Bu,Bin Wang,Xin-Li Xu,Sen Yang,Zhi Sun,Xia Xu
In the current study, natural cotton fiber was served as the supporter of water, and the water acted as an extractant for liquid-phase microextraction of polar components in low-polar edible oils. An in-syringe extraction device was constructed to facilitate the extraction process by simply loading a certain amount of cotton fibers between the syringe needle and the plastic syringe tube. Then, the extraction process can be conveniently conducted by pull-push the syringe plunger. It can be regarded as a new type of dynamic liquid-phase microextraction method while operated more convent. For the feasibility study, the novel in-syringe cotton fiber-supported liquid extraction (CF-SLECF-SLE) pretreatment method was applied to extract free 3-mono-chloropropane-1,2-diol (3-MCPD) in edible oils. Specifically, the cotton fibers supported a certain amount of water by successfully pulling-pushing 1 mL of water and 1 mL of HEX in/out twice, respectively. Then, 2.0 mL of diluted oil sample (containing 0.4 g oil) was loaded in and out four times for extraction, during which process 3-MCPD was extracted into the supported water. The extracted 3-MCPD was desorbed with 1 mL of ethyl acetate (EA), derivatized with trimethyl silane imidazole (TMSI), and analyzed by gas chromatography-tandem mass spectrometry (GC-MS/MS). For three different spiked edible oils, the internal standard normalized matrix effect (IS-normalized ME) values were in ranges of 96.3–104.8% with RSD being 4.3%, benefiting the accurate quantitative analysis. The limit of quantification (LOQ) was calculated to be 2 ng/g, which met the regular determination requirement of 3-MCPD in edible oils. Satisfied linearity was obtained in 2–500 ng/g, with correlation coefficients (R 2 ) being 0.998. The relative recoveries were in the ranges of 96.9–110.5%. The intra-/inter-day RSDs were less than 8.2% and 10.2%, respectively. The proposed method provides an efficient, simple, low-cost, and easy to automate strategy for determining free 3-MCPD in edible oils.
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JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Qiulin Zhang,Beibei Chen,Xueyuan Qin,Zhen Zhou,Yong Liang,Man He,Bin Hu
In this work, porous aromatic frameworks (PAFs) with different pore size were evaluated for simultaneous adsorption of 16 polycyclic aromatic hydrocarbons (PAHs) with large difference in polarity and molecular size. Two other porous organic polymers containing electron pushing/withdrawing group were investigated along for a comparison, and PAF-120 with the pore size of appr. 2.1 nm exhibited the highest extraction efficiency. Based on water contact angle and molecular dynamics simulation, the adsorption of 16 PAHs on PAF-120 was attributed to hydrophobic interaction, π-π interaction and molecular sieving effect. PAF-120/PDMS coated stir bar was then prepared by physical adhesion, and a method of stir bar sorptive extraction-gas chromatography-flame ionization detector was established for trace PAHs analysis in environmental samples. Under the optimal experimental conditions, the limits of detection (S/N = 3) for 16 PAHs were found to be in the range of 42-375 ng/L, with the relative standard deviations of 4.1-14.6% (n = 7). The enrichment factors varied from 31 (Indeno[1,2,3-cd]pyrene) to 80-fold (anthracene), with the maximal enrichment factor of 100-fold. The proposed method was applied to the analysis of PAHs in local environmental water and atmospheric particle samples. None of the 16 PAHs were detected in the collected water samples. While for the collected atmospheric particles, 12 PAHs were detected in fine particulate matter (PM 2.5 ) within the range of 0.6-2.8 ng/m 3 . For inhalable particulate matter (PM 10 ) and total suspended particulate matter (TSP), 16 PAHs were all detected in the range of 0.6-3.8 ng/m 3 and 0.6-5.9 ng/m 3 , respectively. Quantitative recoveries were obtained in recovery test, demonstrating the accuracy and application potential of the proposed method.
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JOURNAL OF FOOD SCIENCE
·
2022
·Vol. 87
·期 10
·4491-4503
·
IF 3.693
Lingyun Yao,Shuangfei Guo,Huatian Wang,Tao Feng,Min Sun,Shiqing Song,Feina Hou
In this work, the volatile fingerprints of different parts of Chongming saffron flowers (stigmas, stamens, and tepals) were analyzed and compared for the first time by headspace-gas chromatography-ion mobility spectrometry. Three different parts of saffron flowers could be clearly distinguished using principal component analysis based on signal intensity data of gas chromatography-ion mobility spectrometry. Therefore, gas chromatography-ion mobility spectrometry coupled with principal component analysis method could be employed as a new method for authentication and quality control of saffron for the reason of frequent addition with stamens and/or tepals as adulterants in saffron. Moreover, the bioactive composition (total flavonoids, total phenolics, and total anthocyanins) and bioactive properties of saffron tepals were evaluated. The results indicated that aqueous, ethanol, and ethyl acetate extracts of saffron tepals exhibited good radical scavenging (2,2-Diphenyl-1-picrylhydrazyl, ABTS, and OH) and enzyme (α-amylase/α-glucosidase) inhibition activities, which probably were attributed to the bioactive components contained in the extracts. This approach would provide the important information for monitoring the quality of saffron as well as exploring the utilization of saffron tepals in functional food technology. Practical Application This study demonstrated that the HS-GC-IMS method might be used as a new strategy for quality control of saffron, and the saffron tepals were rich source of bioactive components that could be used in health-promoting products.
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WATER RESEARCH
·
2025
·
IF 12.4
Linjun Wu,Huan Li,Yanyue Gu,Zhiqiang Shen,Yuexi Zhou,Jiane Zuo
This research introduces an innovative full-process treatment technology that integrates dual-stage gas permeable membranes (GPM) and humic acid (HA) recovery to enhance Fenton oxidation of landfill leachate (LFL). In terms of full-process performance, this integrated approach (LFL-GPM-HA (Fenton)) synergistically combines LFL concentration, ammonia recovery, HA recovery, purified water reclamation, and efficient Fenton oxidation, thereby achieving holistic minimization, detoxification, and resource recovery of LFL. Specifically, under the conditions of low-intensity aeration and a temperature gradient of 65–55–25 °C, the GPM achieved an ammonia recovery rate exceeding 96 %, while the LFL was concentrated by a factor of 4.72 within 12 h. During HA recovery at pH 2, the HA yield from the concentrated LFL reached 3.68 g/L, representing an 88.72 % increase compared to the raw LFL. Due to the significant consumption of bicarbonate alkalinity during the GPM process, the required dosage of H₂SO₄ per gram of HA recovered was reduced by 86.72 %. Under different dimensionless oxidant dosages, the LFL-GPM-HA (Fenton) demonstrated a significant improvement in COD removal efficiency compared to standalone Fenton oxidation. In terms of dissolved organic matter (DOM) molecular-level transformation, ESI FT-ICR-MS analysis showed a significant enhancement in the removal of CHOS and CHONS in LFL-GPM-HA (Fenton), with a concurrent reduction in the produced sulfurous byproducts. Additionally, the LFL-GPM-HA (Fenton) notably increased the frequency of decarboxylation, desulfurization, and dealkylation reactions. In terms of operational stability and economic feasibility, this integrated system demonstrates excellent long-term stability and robust membrane fouling-cleaning recovery properties, achieving LFL treatment at a cost of approximately 12.142 $/m³, which is significantly more cost-effective than conventional full-process advanced treatment technologies (20–30 $/m³). In conclusion, the findings offer a pathway for developing more efficient and cost-effective strategies for LFL management.
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ELECTROCHEMISTRY COMMUNICATIONS
·
2011
·Vol. 13
·期 10
·1119-1122
·
IF 4.287
Dongling Jia,Fenfen Li,Linfeng Sheng,Qiaoqiao Ren,Song Dong,Shanling Xu,Ying Mu,Yuqing Miao
A facile strategy was reported to synthesize and assemble a stable ultrathin film of Ni(OH) 2 nanoparticles at gas/liquid interface where the aqueous phase contained Ni 2+ and the organic phase was composed of triethylamine toluene solution. The ultrathin film of Ni(OH) 2 nanoparticles that precipitated at the interface was transferred onto the electrode surface for the electrocatalysis of bio-thiols and selective electroanalysis of cysteine. The preparation of Ni(OH) 2 ultrathin film and its transfer to an electrode substrate is very simple. The obtained Ni(OH) 2 ultrathin film modified electrodes are stable, showing high electrochemical oxidation toward bio-thiols and good selectivity toward cysteine in phosphate buffered solution of pH 7.5.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2026
·
IF 5.3
Xiuli Ren,Yunheng Yao,Xinzi Wu,Lunpeng Wu,Hanghong Guo,Nanzhe Jiang
In this study, a modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) method coupled with gas chromatography-tandem mass spectrometry (GC-MS/MS) was developed for the simultaneous quantification of 16 pesticide residues in three typical vegetable matrices, using amino-functionalized halloysite nanotubes (HNTs-NQ-62) as a novel cleanup adsorbent. Three modified HNTs, namely HNTs-KH-540, HNTs-KH-792, and HNTs-NQ-62, were synthesized and systematically compared. The results demonstrated that HNTs-NQ-62 yielded lower matrix effects (MEs) values than HNTs-KH-540 and HNTs-KH-792 and exhibited a greater capacity to alleviate matrix interferences. Method validation confirmed that the proposed method achieved favorable linearity, with correlation coefficients ( R 2 ) higher than 0.9989 for all target pesticides. The limits of detection (LODs) and quantification (LOQs) ranged from 0.02 to 1.5 μg/kg and from 0.06 to 5.0 μg/kg, respectively. Satisfactory recoveries of 80.8%-113.7% were obtained, while the intraday and interday relative standard deviations (RSDs) were below 8.8% and 7.2%, respectively. Comparative tests further revealed that HNTs-NQ-62 performed better than the commercial adsorbent in mitigating MEs to a certain extent. This study indicates that HNTs-NQ-62 holds a great promise as a favorable alternative to conventional QuEChERS cleanup adsorbents and that the developed method provides reliable analytical performance for the quantification of the 16 target pesticides in vegetable matrices.
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RSC Advances
·
2022
·Vol. 12
·期 31
·20251-20258
·
IF 4.036
Ying Yang,Jianbo Yin,Fangsheng Tao,Yunshan Zhou,Lijuan Zhang,Yuxu Zhong,Yong'an Wang
By combining the anionic salt meso-tetra(4-carboxyphenyl)porphyrin (TCPP4−) and the Keggin polyoxometalate cation cluster [Al13O4(OH)24(H2O)12]7+ via a simple ion-exchange method, a hybrid (C48H26N4O8)[Al13O4(OH)24(H2O)12]2(OH)10·18H2O (Al13–TCPP) was prepared and thoroughly characterized as a prototype of polyoxometalate–porphyrin hybrids for the photocatalytic degradation of the mustard gas simulant 2-chloroethyl ethyl sulfide (CEES). The experimental results showed that the catalytic degradation rate of CEES in the presence of Al13–TCPP reached 96.16 and 99.01% in 180 and 90 min in methanol and methanol–water solvent mixture (v/v = 1 : 1), respectively. The reaction followed first-order reaction kinetics, and the half-life and kinetic constant in methanol and solvent mixture were 39.8 min, −0.017 min−1 and 14.7 min, −0.047 min−1. Mechanism analysis indicated that under visible light irradiation in air, CEES was degraded through a combination of oxidation and alcoholysis/hydrolysis in methanol and the methanol–water solvent mixture. The superoxide radical (O2˙−) and singlet molecular oxygen (1O2) generated by Al13–TCPP selectively oxidized CEES into a non-toxic sulfoxide. The singlet oxygen capture experiments showed that Al13–TCPP (Φ = 0.236) had a higher quantum yield of singlet oxygen generation than H4TCPP (Φ = 0.135) under visible light irradiation in air. The material Al13–TCPP has good reusability, and the degradation rate of CEES can still reach 98.37% after being recycled five times.
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