MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Xuemei Wang,Yuan Ma,Zheng Zhou,Zhen Zhang,Jie Zhang,Lin Fan,Xinzhen Du,Xiaoquan Lu
Simple and rapid analytical methods for pharmaceuticals and personal care products (PPCPs) are in high demand for environment monitoring. Herein, an in-situ doping strategy was used to ultrarapid synthesize carbon black (CB)-doped Ce (III, IV)-MOF composite with dumbbell-shaped structure at room temperature, which had been used as an electrochemical sensor for the effective and simultaneous detection of typical PPCPs such as dopamine (DA) and acetaminophen (AC) in complex matrices samples using different pulse voltammetry (DPV). Scanning electron microscope (SEM), Nitrogen adsorption-desorption, X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and X-ray powder diffractometer (XRD) were used to characterize the morphological and electrochemical properties of synthesized a series material. The mixed-valent CB/Ce (III, IV)-MOF with excellent pore structure properties provided more exposed active sites, which were more conducive to adsorption and thus improved sensing performance. The result showed that the proposed method had a wide linear range (for DA: 0.3–252.0 µM, for AC: 0.3–252.0 µM) and low detection limits (for DA: 0.0955 µM, for AC: 0.1170 µM). Based on the synergistic effect of both CB and Ce (III, IV)-MOF, the composites modified electrodes had excellent electroanalytical capability for DA and AC, which could be used for efficient and rapid monitoring of ECs and the construction of new electrochemical sensor based on MOFs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2023
·
IF 4.1
Chun-Ying Xu,Yuan-Yuan Cui,Cheng-Xiong Yang
Endocrine disrupting chemicals (EDCs) are a typical class of natural or man-made endogenous hormone agonists or antagonists that can directly or potentially interfere with human endocrine system. However, it is still difficult to analyze trace EDCs directly from complex environment and food matrices. Therefore, the proper sample pretreatment is highly desired and the preparation of efficient adsorbents is of great challenge and importance. Herein, we report the facile one-pot solvothermal synthesis of Fe 3 O 4 nanoparticle doped magnetic β-cyclodextrin microporous organic network composites (MCD-MONs) for the magnetic solid phase extraction (MSPE) of four phenolic EDCs in water and food takeaway boxes prior to the high-performance liquid chromatography analysis. The sheet-like Fe 3 O 4 doped MCD-MONs offered good magnetic property (16.5 emu g −1 ) and stability, and provided numerous hydrogen bonding, hydrophobic, π-π, and host-guest interaction sites for EDCs. Under the optimal experimental conditions, the established method was successfully verified with wide linear range (2.0–1000 µg L −1 ), low limits of detection (0.6–1.0 µg L −1 ), good precisions (intra-day and inter-day RSDs < 5.2 %, n = 3), large enrichment factors (88–98) and adsorption capacity (90.3–255.8 mg g −1 ), short extraction time (6 min), less adsorbent consumption (3 mg), and good reusability (at least 8 times) for EDCs. The proposed method was successfully applied to detect the trace EDCs in real samples with the recovery of 84.0–99.7 %. This work demonstrated the great potential of MCD-MONs for the efficient MSPE of trace EDCs from complex food takeaway boxes and water samples and uncovered the prospect of CD-based MONs in sample pretreatment.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Zhiyuan Feng,Qingling Tian,Qianqian Yang,Yanbo Zhou,Hongying Zhao,Guohua Zhao
The fine-tuning of generating hydroxyl radical ( OH) and singlet oxygen ( 1 O 2 ) was firstly proposed via the selectively photoelectrochemical (PE) reduction of oxygen with Cu-coordinated carbon-nitride-electrode (CuCN). Complete removal efficiency and trace Cu leaching (<0.01 ppm) were achieved during treatment of dimethyl phthalate and atrazine, which were mainly oxidized by OH and 1 O 2 , respectively. Besides, no toxic intermediates was detected in the whole degradation process. The overall oxygen reduction pathway in PE system was demonstrated by electron paramagnetic resonance measurements and quenching tests. The valence band position of CuCN was designed to be more negative (−1.5 V SHE ) for favoring the photocatalytic oxygen reduction. Specifically, Cu-N 2 -C as active sites optimized the Gibbs free energy of intermediate *OOH (ΔG *OOH = 3.99 eV) to improve the reactivity of two-electron oxygen reduction. The CuCN/photoelectrochemical system is applied for treatment of coal water slurry gasification (CWS) wastewater with high concentration of salt. The TOC of CWS was successfully decreased from 127 to 1.9 mg·L −1 in 3 h with a low specific energy consumption of 0.024−0.05 kW·h·g −1 ·TOC −1 . The treated CWS wastewater can be used for recovery and utilization of salt as chemical raw materials. This work highlights the important role of synergistic photo-electro-catalytic effect in regulating the generation of active oxygen species via oxygen reduction pathway, which can be a promising way especially for salinity coal wastewater remediation.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Zong-Da Du,Yuan-Yuan Cui,Cheng-Xiong Yang
Microporous organic networks (MONs) are a potential class of microporous materials in analytical chemistry . As great efforts have been made in sample pretreatment and gas chromatography, the application of MONs in high performance liquid chromatography (HPLC) has largely lagged and has never been investigated. In addition, directly packing of MONs into columns for HPLC is impractical due to the high column pressure and low column efficiency resulted from the sub-micron sized and irregular MONs. To solve these issues and uncover the possibility of MONs in HPLC, here we report the fabrication of spherical silica amino-functionalized MON (SiO 2 @MON-NH 2 ) composite as a novel stationary phase for HPLC. Neutral, acidic and alkaline probes were evaluated on SiO 2 @MON-NH 2 packed column. A column efficiency of 21,246 plates per meter was obtained for n -propylbenzene. The results revealed the hydrophobic interaction was the main separation mechanism on SiO 2 @MON-NH 2 packed column. Baseline separation of benzenediol , dichlorophenol , chlorophenol and phenylenediamine position isomers, deoxynucleosides and nucleosides was also achieved on SiO 2 @MON-NH 2 packed column. The relative standard deviations of retention time, peak height and peak area for the studied position isomers, deoxynucleosides and nucleosides were 0.2–0.7%, 0.3–3.7% and 1.7–3.5%, respectively. The SiO 2 @MON-NH 2 packed column also offered better resolution for dichlorophenol isomers, deoxynucleosides and nucleosides than SiO 2 –NH 2 and commercial C18 columns. These results revealed the potential of MONs in HPLC and also provided a new way for the use of nano-sized or irregular MONs in HPLC.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Qingling Tian,Fan Xiao,Hongying Zhao,Xianbin Fei,Xuqian Shen,Georgeta Postole,Guohua Zhao
The regeneration of surface Fe II and the electro-formation of H 2 O 2 play crucial roles for determining the degradation efficiency of heterogeneous electro-Fenton process. The sulfide iron-based carbon aerogel was synthesized directly as cathode. The main composition of iron compounds were Fe 3 O 4 and FeS∙FeS 2 , which were embedded in the matrix of carbon aerogels. Most of sulfur was evenly distributed on carbon, favoring the formation of −COOH groups. The nature of existed sulfur were investigated by temperature-programmed reaction spectroscopy respectively under the CO 2 and air. The S-doping promoted the regeneration of Fe II and improved the selectivity of 2e − oxygen reduction with iron-based carbon materials. As high as 99 % removal of dimethyl phthalate and 3-chlorophenol were obtained in 240 min. Meanwhile, the EPR results demonstrated that HO∙ was formed by on site decomposing H 2 O 2 with FeSCA, which exhibited high stability with low Fe leaching (< 2 ppm) and high recyclability even in acidic medium.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 4
·1-11
·
IF 6.232
Wang Qianqian,Li Gaigai,Wang Chun,Wu Qiuhua,Wang Zhi
A layered porous organic framework (L-POF) with high surface area and porous volume was used as a novel adsorbent for adsorption of chlorophenols (CPs). The L-POF showed much higher adsorption capacity for four CPs (2-CP, 3-CP, 2,3-CP, 2,4-CP) compared with corresponding amorphous POF and some commercial adsorbents. Then, an L-POF-based solid-phase extraction method combined with high-performance liquid chromatography for analyzing CPs at the wavelength of 280 nm in water and honey samples was established. Under the optimum conditions, four CPs exhibited good linearity in the range 0.10–80.0 ng mL −1 for water and 2–400 ng g −1 for honey samples with determination coefficient r 2 > 0.996. The method has low limits of detection of 0.03–0.10 ng mL −1 for water and 0.5–1.0 ng g −1 for honey samples. The method presented satisfactory precision and accuracy with relative standard deviations ≤ 7.8% and recoveries of 80–115%. High enrichment factors of 123–190 for water and 63–97 for honey were obtained. The validated method was successfully used to determine CPs in water and honey samples. The L-POF also displayed prominent adsorption performance for many other dyes and organic contaminants. This suggests that it can be an ideal candidate as adsorbent for wide application in separation and analysis.
Graphical Abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 7
·2890-2896
·
IF 3.288
Yinhui Yang,Meiling Qi,Jinliang Wang
Here we report a novel hexaphenylbenzene (HPB)-based material functionalized with six tetraphenylethylene units (BPT) with unique conformation-driven selectivity for gas chromatographic (GC) separations. It is composed of a neat aromatic hydrocarbon with a rigid propeller-like conformation. As a result, the BPT capillary column exhibited high column efficiency of 5340 plates per m and high-resolution capability for aromatic to aliphatic isomers with excellent intra-day and inter-day repeatability and between-column reproducibility. The results demonstrate the unique conformation-driven selectivity of the HPB-based stationary phase, which is rarely reported for chromatography. Moreover, its application in the determination of isomer impurities in commercial products proved its good potential for practical GC analysis. This work presents a new perspective for developing selective stationary phases by engineering their structures.
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 2
·1338-1346
·
IF 8.897
Li Zhijun,Zhang Mingyang,Zhang Lili,Dong Xiuli,Leng Leipeng,Horton J. Hugh,Wang Jun
Tuning the electronic properties of single atom catalysts (SACs) between the central metal and the neighboring surface atoms has emerged as an efficient strategy to boost catalytic efficiency and metal utilization. Here we describe a simple and efficient approach to create atomically dispersed palladium atoms supported over defect-containing porous ceria nanorod containing palladium up to 0.26 wt.%. The existence of singly dispersed palladium atoms is confirmed by spherical aberration correction electron microscopy and extended X-ray absorption fine structure measurements. This catalyst shows excellent efficiency in hydrodehalogenation reactions at low H 2 pressure under mild conditions, along with satisfactory recyclability and scalability. Density functional theory (DFT) calculations reveal that the high activity stems from the spatial isolation of palladium atoms and the modified electronic structure of palladium confined in defect-containing ceria nanorod. This work may lay the foundation for the facile creation of single atom catalysts within the synthetic community and shed light on the possibility for scale-up production.
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2021
·
IF 7.514
Weihua Liu,Juntao Wang,Shuangju Song,Lin Hao,Jiajia Liu,Yangjuan An,Yaxing Guo,Qiuhua Wu,Chun Wang,Zhi Wang
A uniform spherical structure covalent organic framework (TAPA-BPDA-COF) was prepared by a facile method at room temperature with tris(4-aminophenyl)amine (TAPA) and 4,4′-biphenyldicarboxaldehyde (BPDA) as building blocks. Based on the solid phase extraction with the TAPA-BPDA-COF as the sorbent and high performance liquid chromatography-diode array detection, a sensitive analytical method was established for the determination of four neonicotinoid insecticides from water and honey samples. Under the optimum conditions, good linear response for the quantification of the analytes was achieved in the range of 0.3–50.0 ng mL −1 for water samples and in the range of 8.0–500.0 ng g −1 for honey samples. The method recoveries fell in the range of 80.0–121.9% with RSDs less than 7.6%. The limits of detection at the signal to noise ratio of 3 were measured to be in the range of 0.08–0.12 ng mL −1 for water samples and 2.6–3.3 ng g −1 for honey samples, depending on compounds.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Shengnan Huang,Fan Tian,Jiawei Dai,Xuesong Tian,Guangfang Li,Yunling Liu,Zhiquan Chen,Rong Chen
Chlorophenols (CPs) treatment in water is a huge challenge due to its native robustness and harmful chlorinated by-products in degradation. In this work, we developed a specific BiO 2-x with high density Bi-O-Bi-O vacancy via a facile hydrothermal process. Extraordinary CPs removal ability under near infrared (NIR, >700 nm) is achieved over the as-prepared product. The presence of vacancies not only induced strong interactions between CPs and photocatalyst, but also promoted singlet oxygen ( 1 O 2 ) and photogenerated holes (h + ) generation. Furthermore, the generated 1 O 2 is found mainly originating from lattice oxygen release and the superoxide radicals ( O 2 − ) oxidation from BiO 2-x . Such performance could be well-maintained under wide pH range as well as in the presence of different constitutes in water matrix. This work unravels a unique function of BiO 2-x photocatalyst for CPs decomposition and provide a rational design of highly efficient photocatalysts toward optimization of pollutants degradations.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Meng Xie,Junchuan Tang,Lingshuai Kong,Wenhui Lu,Vinothkumar Natarajan,Feng Zhu,Jinhua Zhan
In this work, monochlorophenols (MCPs) isomers degradation was investigated by Co-doped g-C 3 N 4 (CCN) using peroxymonosulfate (PMS) as the oxidant. The effects of the doping amount of Co, the concentration of PMS, the loading of catalyst and initial pH of the solution on the catalyst activity were systematically studied. The results showed that MCPs could be degraded effectively by CCN/PMS system. The degradation reaction followed pseudo-first order kinetics. Sulfate radical (SO 4 − ) was found as the major active radicals in the degradation process. MCPs were degraded effectively with the degradation rate order of 2-chlorophenol (2-CP) > 3-chlorophenol (3-CP) > 4-chlorophenol (4-CP). Except for the influence of structural characteristics of MCPs, this degradation rate order was also related to the adsorption behavior of CCN, which was based on the intermolecular interaction. Based on the analysis of the degradation products of MCPs, 1,4-benzoquinone or chlorinated 1,4-benzoquinone had been found to be the main intermediates.
✓ 已验证
产品关联
DOI
高影响因子
Food Additives and Contaminants Part A-Chemistry Analysis Control Exposure & Risk Assessment
·
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.
✓ 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）