MICROCHIMICA ACTA
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2017
·Vol. 185
·期 1
·1-9
·
IF 4.58
Zang Xiaohuan,Chang Qingyun,Liang Weiqian,Wu Tong,Wang Chun,Wang Zhi
A magnetic micro-solid phase extraction method was applied for the extraction of trace levels of various chlorophenols prior to their determination by high performance liquid chromatography. The reduced graphene oxide functionalized with magnetic iron oxide nanoparticles and graphitic carbon nitride was prepared and used as adsorbent. It was characterized by scanning electron microscope, X-ray diffraction and vibrating sample magnetometer. Placed in a polypropylene hollow tube, the material was applied to the extraction of 3-chlorophenol, 2,3-dichlorophenol, 2,4-dichlorophenol, and 2,4,6-trichlorophenol in cosmetic samples. Several experimental parameters that affect extraction efficiency were optimized. Following desorption with alkaline methanol, the chlorophenols were quantified by high performance liquid chromatography. A linear response was observed in the 1.0–200 μg·kg −1 CP concentration ranges. The detection limits (at a signal-to-noise ratio of 3) are between 0.20 and 0.30 μg·kg −1 . The relative recoveries of the CPs from spiked cosmetics samples were in the range from 80.5 to 104%, with relative standard deviations lower than 12%. The filled extraction tube is high durable and stable. It can be used for 120 extraction cycles without a significant loss of extraction efficiency. The good adsorption ability of the sorbent was attributed to the strong π stacking interaction between the graphitic carbon nitride functionalized reduced graphene oxide and the aromatic rings in the CPs.
A magnetic micro-solid phase extraction (M-μSPE) method was applied to the extraction of various trace chlorophenols prior to their determination by high performance liquid chromatography. The M-μSPE method combines the advantages of both MSPE and μSPE.
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JOURNAL OF CHROMATOGRAPHY A
·
2017
·
IF 3.981
Juntao Wang,Menghua Li,Caina Jiao,Yuhong Song,Chun Wang,Qiuhua Wu,Zhi Wang
A magnetic porphyrin-based porous organic polymer (M-PPOP) with good porosity, high surface area and strong magnetism was prepared and employed as the adsorbent for the magnetic solid phase extraction of the phenylurea herbicides (metoxuron, monolinuron, chlorotoluron, and buturon) from bottled grape juice and tomato samples prior to their determination by high performance liquid chromatography. Under the optimized conditions, the developed method exhibited a good linear range, low limits of detection, low relative standard deviations (<6.8%), good method recoveries between 80.8% and 117%, and high enrichment factors (51–106). For a better elucidation of the adsorption of the M-PPOP towards the analytes, the extraction performance of the M-PPOP for different types of organic compounds including polycyclic aromatic hydrocarbons, phenylurea insecticides, phenylurea herbicides and phenols was studied. The results indicated that the π- stacking, hydrogen-bonding and hydrophobic interactions between the M-PPOP and the analytes played a main role for the adsorption. The results revealed that the M-PPOP material had a great potential for the enrichment of more organic pollutants from real samples.
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JOURNAL OF CHROMATOGRAPHY A
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2017
·
IF 3.981
Juanjuan Wu,Ruiyang Ma,Lin Hao,Chun Wang,Qiuhua Wu,Zhi Wang
A hypercrosslinked organic polymer material (named as PPTPA) was prepared by a simple one-step self-polycondensation of triphenylamine. A series of characterization experiments, including N 2 adsorption, scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectra, and thermogravimetric analysis, were carried out to evaluate the morphology, structure and other intrinsic properties of the PPTPA. To investigate its adsorption performance, the PPTPA was used as the solid-phase extraction adsorbent for the extraction of phenylurea herbicides from water, milk and tomato juice samples followed by high-performance liquid chromatographic analysis. Under optimum conditions, good linearity for the analytes was observed in the range of 0.05–40.0 ng mL −1 , 0.1-40.0 ng mL −1 and 0.5–40.0 ng mL −1 for water, milk and tomato juice samples, respectively. The established method also showed low limits of detection (S/N = 3) in the range of 0.008–0.01 ng mL −1 , 0.01–0.03 ng mL −1 and 0.05–0.1 ng mL −1 for water, milk and tomato juice samples, respectively. The possible adsorption mechanism of the PPTPA towards the analytes was investigated, and the results demonstrated that the hydrogen bonding was the main interaction force between the PPTPA and the analytes. It suggests that the PPTPA can serve as a promisingadsorbent for the efficient pre-enrichment of organic compounds with more hydrogen-bonding donor sites.
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ADSORPTION SCIENCE & TECHNOLOGY
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2012
·
IF 0.606
Jinyu Chu,Bing Wang,Yujun Song,Xiaohua Zou,Chunxiang Li,Yongsheng Yan
A highly selective imprinted amino-functionalized Fe3O4@SiO2 sorbent was prepared by surface molecular imprinting technique for selective removal of trace 2,4-dichlorophenol (2,4-DCP) in water samples. The 2,4-DCP-imprinted amino-functionalized Fe3O4@SiO2 sorbent was characterized by Fourier transform infrared, transmission electron microscopy, vibrating sample magnetometer, thermogravimetric analysis and batch-mode binding studies. The imprinted functionalized Fe3O4@SiO2 sorbent exhibited high selectivity and offered a fast kinetics for the adsorption of 2,4-DCP. The prepared sorbent was shown to be promising for selective removal of trace levels of 2,4-DCP in environmental water samples.
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JOURNAL OF SEPARATION SCIENCE
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2016
·Vol. 39
·期 16
·3186-3194
·
IF 2.741
Li Gao,Yinmao Wei
A novel mixed-mode adsorbent was prepared by functionalizing silica with tris(2-aminoethyl)amine and 3-phenoxybenzaldehyde as the main mixed-mode scaffold due to the presence of the plentiful amino groups and benzene rings in their molecules. The adsorption mechanism was probed with acidic, natural and basic compounds, and the mixed hydrophobic and ion-exchange interactions were found to be responsible for the adsorption of analytes. The suitability of dispersive solid-phase extraction was demonstrated in the determination of chlorophenols in environmental water. Several parameters, including sample pH, desorption solvent, ionic strength, adsorbent dose, and extraction time were optimized. Under the optimal extraction conditions, the proposed dispersive solid-phase extraction coupled with high-performance liquid chromatography showed good linearity range and acceptable limits of detection (0.22∽0.54 ng/mL) for five chlorophenols. Notably, the higher extraction recoveries (88.7∽109.7%) for five chlorophenols were obtained with smaller adsorbent dose (10 mg) and shorter extraction time (15 min) compared with the reported methods. The proposed method might be potentially applied in the determination of trace chlorophenols in real water samples.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2016
·
IF 3.299
Yue Zhang,Zhiyong Li,Huiyong Wang,Xiaopeng Xuan,Jianji Wang
Phenolic compounds are an important class of compounds for organic chemical industry. In their traditional production processes, strong acid and base have to be used for the separation of phenolic compounds from oils, which often causes serious environmental problems. In this work, choline derivative salts [N 1,1, n C 2 OH]Cl ( n = 1, 4, 6, 8) have been used as new extractants for the separation of 26 kinds of phenolic compounds from model oil (toluene) by forming deep eutectic solvents (DESs). It is found that only 16 kinds of phenolic compounds can be removed from toluene with single-step removal efficiency from 28.1% to 94.7%, strongly depending on the chemical structure of phenolic compounds. The nature, position and number of substituent groups in the phenolic compounds have a great effect on their removal efficiency. Far infrared spectroscopy and density functional theory calculations indicate that hydrogen bonds formed between –OH of the phenolic compounds and anion of the choline derivative salts is the main driving force for such DES-based separation. The correlation observed experimentally between structure of phenolic compounds and their removal efficiencies has been discussed from hydrogen bonding in DESs, electrostatic interaction of cation and anion of the choline salts, and solvation of the phenolic compounds and choline salts in the oil.
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JOURNAL OF COORDINATION CHEMISTRY
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2016
·
IF 1.756
Xiuling Xu,Saisai Yan,Fan Hu,Wei Zhao,Qi Shuai
Three calcium coordination compounds, [Ca(CPA)(H2O)4]·(CPA), 1, [Ca(MCPA)2(H2O)2]·H2O, 2, and [Ca(TCPA)2(H2O)3]·2H2O, 3 [HCPA = 3-chlorophenoxyacetic acid, HMCPA = 2-methyl-4-chlorophenoxyacetic acid, and HTCPA = 2,4,6-trichlorophenoxyacetic acid], have been synthesized by the microwave method with advantages that include shorter reaction times, lower energy consumption, and higher product yield. The structures have been characterized by IR, elemental analysis, and single-crystal X-ray diffraction. Influences on the crystal structures by changing the number and position of chlorine substituent group in phenoxyacetic acid are discussed. Steric hindrance effects involving the Cl and an ability to form the O–H⋯Cl hydrogen bonds enrich the structure diversity. TG analysis reveals that the thermostability for the three compounds is 3 > 1 > 2, which could be influenced by the existence of hydrogen bonds (O–H⋯Cl and O–H⋯O).
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JOURNAL OF CHROMATOGRAPHY A
·
2013
·
IF 4.612
Mei Zhang,Jun-Hui Zhang,Yan Zhang,Bang-Jin Wang,Sheng-Ming Xie,Li-Ming Yuan
This study focused on exploring the chromatographic characteristic of a homochiral MOF [Cu 2 ( d -Cam) 2 (4,4′-bpy)] n with 3-D six-connected self-penetrating architectures for the separations of positional isomers and chiral compounds. Some effects such as mobile phase composition, column temperature, and analytes mass for separations on this chiral column also have been investigated. Among thirteen tested racemates, six compounds, namely three alcohols, a diol, a naphthol and a ketone were successfully discriminated, and ten useful positional isomers which have never been separated on other MOFs stationary phases in HPLC except dichlorobenzene and cresol isomers, were also analyzed by this chiral stationary phase. The results indicated that [Cu 2 ( d -Cam) 2 (4,4′-bpy)] n exhibited good selectivity for positional isomers and enantiomers. Therefore, it is practicable that the separation of positional isomers and enantiomers are carried out on the chiral MOF column.
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JOURNAL OF LUMINESCENCE
·
2014
·
IF 2.367
Xiao Wei,Zhiping Zhou,Jiangdong Dai,Tongfan Hao,Hongji Li,Yeqing Xu,Lin Gao,Jianming Pan,Chunxiang Li,Yongsheng Yan
In this paper, a simple procedure for the determination of 2,4,5-trichlorophenol (2,4,5-TCP) is reported. Mn-doped ZnS quantum dots (QDs) capped by molecularly imprinted polymers (MIPs) were prepared. MIPs were characterized by spectrofluorometer, UV–vis spectrophotometer , X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscope (TEM) and scanning electron microscope (SEM). Meanwhile, spectrofluorometer was used to the evaluation of optical stability, the effect of pH, and the selective and sensitive determination of 2,4,5-TCP. Under optical conditions, MIPs-capped Mn-doped ZnS QDs were successfully applied to the detection of 2,4,5-TCP in water selectively and sensitively, and a linear relationship was obtained to cover the concentration range of 5.0–50 μmol L −1 with a correlation coefficient of 0.9913. Moreover, 2,4,5-TCP could quench the room temperature phosphorescence of MIPs-capped Mn-doped ZnS QDs in a concentration-dependent manner, which was best described by a Stern–Volmer-type equation.
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Food Additives and Contaminants Part A-Chemistry Analysis Control Exposure & Risk Assessment
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2015
·
IF 1.802
Xingli Liu,Xin Zhou,Chun Wang,Qiuhua Wu,Zhi Wang
A novel magnetic three-dimensional graphene nano-composite (3D-G@Fe3O4) with a high surface area was synthesised by a vacuum freeze-dried method. Due to its high surface area, specific 3D nanoporous structure and excellent magnetic properties, it can be used as a magnetic solid-phase extraction adsorbent. Some chlorophenols in a honey samples were enriched by this nanocomposite prior to their determination by HPLC with ultraviolet detection. Factors that affect the extraction efficiency, such as the amount of 3D-G@Fe3O4, extraction time, sample pH, ionic strength and desorption conditions, were investigated and optimised. Under the optimum conditions, good linearity existed in the range of 10.0–1000.0 ng g–1. The enrichment factors of the method for the analytes were in the range from 101 to 248. The limits of detection of the method (S/N = 3) were 1.0–1.5 ng g–1. The recoveries of the method for the analytes at spiking levels of 100.0 and 400.0 ng g–1 were in the range of 93.2–98.9%. The results showed that the proposed method is simple, reliable and sensitive. It will be a useful tool for the routine monitoring of chlorophenols in honey products.
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JOURNAL OF CHROMATOGRAPHY A
·
2014
·
IF 4.258
Chun Wang,Ruiyang Ma,Qiuhua Wu,Meng Sun,Zhi Wang
In this paper, porous carbon with a highly ordered structure was synthesized using zeolite ZSM-5 as a template and sucrose as a carbon source. Through the in situ reduction of Fe 3+ , magnetic property was successfully introduced into the ordered porous carbon, resulting in a magnetic porous carbon (MPC). MPC was used as an adsorbent for the extraction of some chlorophenols (2-chlorophenol, 3-chlorophenol, 2,3-dichlorophenol and 3,4-dichlorophenol) from water and peach juice samples followed by high performance liquid chromatography-ultraviolet detection. Good linearity was observed in the range 1.0–100.0 ng mL −1 and 2.0–100.0 ng mL −1 for water and peach juice sample, respectively. The limits of detection ( S / N = 3) were between 0.10 and 0.30 ng mL −1 . The relative standard deviations were less than 5.3% and the recoveries of the method for the compounds were in the range from 87.8% to 102.3%. The results demonstrated that the MPC had a high adsorptive capability toward the four chlorophenols from water and peach juice samples.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zheng Li,Jiehao Xie,Zipin Peng,Zhuo Ma,Yihui Li,Xingkun Chen,Yuan Tan,Wenshao Yang,Yunjie Ding
4-Chlorophenol (4-CP) is a pervasive environmental pollutant commonly found in wastewater and groundwater, posing great risks to both human health and the ecosystem. Catalytic hydrodechlorination (HDC) of 4-CP by utilizing hydrogen (H 2 ) as a reductant has emerged to be an efficient and sustainable way to treat pollutant water. This study focuses on the development of an efficient and stable Pd-based catalyst for the catalytic HDC of 4-CP. By incorporating an appropriate amount of Ni into Al 2 O 3 support, a NiAl 2 O 4 (NA) spinel was synthesized, enhancing the interaction between Pd and the support, leading to precise control over Pd species and oxygen vacancies. The tailored properties of the Pd/NA-1 catalyst result from meticulous adjustment of the Pd 2+ /Pd 0 ratio and oxygen vacancies, which promotes electron transfer from Pd to Ni within the NiAl 2 O 4 spinel. In comparison to the Pd/Al 2 O 3 catalyst, the Pd/NA-1 catalyst exhibits exceptional stability, with continuous operation for over 120 h without deactivation. Comprehensive characterization analyses indicate that the Pd/NA-1 catalyst effectively prevented the aggregation of Pd nanoparticles, maintaining the Pd 2+ /Pd 0 ratio at 1, which is crucial for its superior stability. This work provides valuable insights into the development of Pd-based catalysts for HDC reactions, highlighting the potential use of Pd/NA-1 catalysts in treating hazardous pollutants like 4-CP in waste systems.
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