ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Yalan Hu,Yueru Shi,Yuefan Liu,Yixin Kuang,Suxin Zhou,Luyi Chen,Sai Ouyang,Ningbo Zhou,Juan Zheng,Gangfeng Ouyang
Aromatic esters have been widely used in daily life with non-ignorable dangers, such as plasticizer , flavor , and preservative. Their wide applications and corresponding hazards caused by overuse have promoted the rapid development of sensitively analytical method for effective regulation. However, the variety makes it challenging for broad-spectrum and simultaneous extraction of diverse aromatic esters from the highly complex cosmetic samples. To our delight, a covalent organic framework, named DaTp (1, 3, 5-triformylphloroglucinol-2, 6-diaminoanthracene), possessing high specific surface, excellently thermochemical stability, and abundant electron-rich heteroatoms , has been synthesized and fabricated as a competitive solid phase microextraction coating for extracting the trace analytes with diverse polarity, through the hydrophobic interaction, π-π conjugation and hydrogen bond . Herein, this self-made SPME fiber has been further coupled with gas chromatography-tandem mass spectrometry (GC-MS) to determine the multi-polar aromatic esters in cosmetics packaged with plastic. This developed analytical method showed wide liner ranges, low limits of detection, good repeatability and reproducibility. Finally, the aromatic esters in four cosmetic samples were quantified precisely with satisfactory recoveries (80.7%–118%).
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Biomaterials Science
·
2022
·Vol. 10
·期 16
·4656-4666
·
IF 7.59
Dongya Wang,Qianqian Zhao,Jingcan Qin,Yuanyuan Guo,Chuan Zhang,Yuehua Li
Ischemic stroke often causes devastating damage to human life and health. Excess production of reactive oxygen species (ROS) during thrombolysis will paradoxically result in neuronal injury. Neuroprotection from reperfusion injury must overcome the challenge of crossing the blood–brain barrier (BBB). A strategy including thrombolysis and ROS scavenging accompanied by BBB penetration is highly desirable for improving combination therapies in ischemic stroke. Herein, urokinase plasminogen activator (uPA) loaded on black phosphorus nanosheets (BPNs) is tested as a nanodrug for sequential thrombolysis and neuroprotection. The in vitro thrombolysis shows that the uPA-loaded BPNs can efficiently deliver uPA for thrombus dissolution. The residual BPNs after uPA release exhibit ROS scavenging effects, especially for the most common H2O2 and ˙OH species. Moreover, in vivo studies show that the BPNs can cross the BBB with the assistance of laser irradiation, owing to their good photothermal properties. Further experiments show the effectiveness of BPNs for attenuating reperfusion injury and achieving neuroprotection. These results highlight the promising potential of the present BPN-based nanodrugs for the treatment of ROS-related diseases.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2022
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IF 6.437
Shiyun Tang,Qiuyuan Xu,Kexin Liu,Junjiang Guo,Anjiang Tang
Coking with carbon deposition in hydrocarbon fuel (C x H y ) pyrolysis at high temperature is a serious problem to be considered. In this work, single component C x H y with different structures was used as the probe of the carbon deposition. Thirteen simple and representative of alkanes, cycloalkanes , aromatics and O-containing C x H y were selected as the model compounds to decompose and coking in microchannel continuous flow reactor under the same conditions. The distributions of gas, liquid and solid phase products formed by C x H y pyrolysis were characterized by GC, GC-MS, SEM and TPO-IR respectively. The results demonstrate that the molecular structure of C x H y has a great influence on pyrolysis and coking behavior. For all alkanes, CH 4 , C 2 H 4 , C 3 H 6 and C 4 H 8 are the most abundant in gaseous products, and their total content exceeds 70 %. For cycloalkanes, monocyclic cyclohexane pyrolysis tends to produce C 2 H 4 , C 4 H 8 and 1,3-C 4 H 6 , while bicyclic decahydronaphthalene pyrolysis tends to produce CH 4 , C 2 H 4 and C 3 H 6 . For aromatics, CH 4 and C 2 H 4 are the main products in the pyrolysis gas phase of benzene, toluene and ethylbenzene . Interestingly, in the liquid phase of the pyrolysis of O-containing C x H y (ethanol, acetone and tetrahydrofuran), most of the products are oxygenated compounds and no aromatics. SEM and TPO-IR revealed that at least three carbon species were formed by cracking of C x H y molecules with different structures, including amorphous, filamentous and granular carbon. However, due to the great and complex influence of C x H y molecular structure on the micro morphology of carbon deposition, it is difficult to classify all carbon species at present, which needs further experiments and researches.
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JOURNAL OF SEPARATION SCIENCE
·
2022
·Vol. 45
·期 11
·1866-1873
·
IF 3.614
Gaowa Jin,Lijie Liu,Yuanliu Yang,Yan Zhang,Ping Zhao,Dongping Yu,Yongzheng Zhou,Zhimou Guo,Hui Wang,Xinmiao Liang
The availability of various high-purity unsaturated fatty acids has a wide range of needs due to their different activities. The nonlinear preparative chromatography behavior and principle for purification of palmitoleic acid with octadecyl bonded stationary phases were studied. The peak broadening and the concentration distribution of the target compounds were used to compare different C18 stationary phases. In preparative liquid chromatography, the C18 stationary phases with low, medium, and high bonding density showed different peak broadening and concentration distribution results. Medium bonding density C18 was suitable for the purification of ethyl palmitoleic acid. The forward broadening was much greater than the backward broadening on medium bonding density C18 column. And the highest concentration distribution of impurities and the main peak was not crossed in this column. Due to the low content of crude ethyl palmitoleic acid sample, a two-step purified method yields an oily product with purity of 96.57% in the GC method. This method would be universal and extensible for constructing purification method for other unsaturated fatty acids.
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Journal of Physical Chemistry C
·
2022
·
IF 4.177
Yuemiao Lai,Zhengtian Pu,Peng Liu,Fangliang Li,Jie Zeng,Xueming Yang,Qing Guo
The low-temperature C–H bond activation of alkanes remains a big challenge in alkane dehydrogenation. In this work, ethylbenzene (EB) oxidative dehydrogenation has been investigated on rutile(R)-TiO2(110) under both ultrahigh vacuum (UHV) and ambient conditions. Under UHV conditions, styrene is produced with nearly 100% selectivity in a stepwise manner, in which the first C–H bond dissociation of EB occurs at <285 K with the help of surface O22– species, followed by the second C–H bond dissociation at about 400 K. However, styrene, acetophenone, and 2,3-diphenylbutane products are produced from EB oxidative dehydrogenation under ambient conditions, suggesting that α-H dissociation is the initial step of EB oxidative dehydrogenation. This may be also possible for EB oxidative dehydrogenation on R-TiO2(110) under UHV conditions. The different pathways of EB oxidative dehydrogenation under UHV and ambient conditions may originate from different intermediates and O2 concentrations. This work provides new insight into the fundamental understandings of the low-temperature C–H bond activation of alkyl chains of aromatic hydrocarbons, which may promote the development of new catalysts for efficient styrene production from EB oxidative dehydrogenation under mild conditions.
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Solar RRL
·
2022
·Vol. 6
·期 8
·2200279
·
IF 9.173
Jie Deng,Wanying Lei,Junwei Fu,Huile Jin,Quanlong Xu,Shun Wang
Herein, photocatalytic selective oxidation of hydrocarbons through O 2 represents a promising way for fine chemical industry on account of its mild reaction condition. In this work, Co 3 O 4 -modified BiOBr/AgBr S-scheme heterojunction can effectively oxidize sp 3 C H bonds at benzylic position to its corresponding aldehydes, with a toluene to benzaldehyde selectivity of 94%, which is much higher than that of pure BiOBr (21.7%) and AgBr (58.9%). A unique S-scheme charge-transfer mode is confirmed for the ternary composites by the X-ray photoelectron spectroscopy and reactive species quenching measurement. The remaining photogenerated electrons in AgBr with powerful reduction ability can react with O 2 to generate •O 2 − species, which can further oxidize the benzyl radical formed on the Co 3 O 4 surface to peroxyl radicals and then thermodynamically decompose to benzaldehyde. Herein, this work has important guiding significance for the structure regulation of photocatalysts and application in selective oxidation of sp 3 C H bond of hydrocarbons.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Pan Cheng,Cancan Ji,Wei Hu,Peng Huang,Qihao Guo,Ming Xia,Qin Cheng,Jia Xu,Ke Liu,Dong Wang
Construction of ion-exchange chromatography membrane with appropriate pore size and high-density ligands is essential to improve its working efficiency and service life for the separation and purification of biomacromolecules such as RNA . Herein, surface aminated ethylene vinyl alcohol copolymer (EVOH) ion-exchange chromatography nanofibrous membrane (PEI-NFM) with 0.7 µm pore size was fabricated by sea-island spinning and in situ crosslinking (EVOH nanofibers reacted with glutaraldehyde (GA) and polyethyleneimine (PEI) in dispersion). Morphological and chemical characterization of PEI-NFM indicated that GA and PEI crosslinked on the surface of nanofibers uniformly. Benefiting from the 3D network scaffold structure stacked by nanofibers and high-density amine groups, PEI-NFM exhibits high saturated capacity toward RNA (191.16 mg/g), and still possesses more than 93% of its initial adsorption capacity after ten times cyclic adsorption-elution. Moreover, PEI-NFM packed syringe-driven filter shows high water flux of 10.38 L/h at 0.1 MPa and a high dynamic adsorption performance toward RNA (144.07 mg/g at 1 mm/min). Besides, PEI-NFM exhibits high-recognition binding property toward RNA mixed with other biomacromolecules by adjusting pH of mixed solution to make other biomacromolecules positively charged. This work provides a facile strategy for the preparation of high performance and long service life ion-exchange chromatography membrane.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Jiahai Ding,Wei Guan,Leiyu Zhang,Xiudong Zhang,Chundong Zhang,Lei Wang,Hui Wan,Guofeng Guan
Isobaric binary vapor–liquid equilibrium (VLE) data for ethylbenzene + ethyl benzoate, o-xylene + ethyl benzoate, m-xylene + ethyl benzoate, and p-xylene + ethyl benzoate, as well as the quinary VLE data for ethyl benzoate + o-xylene + m-xylene + p-xylene + ethylbenzene, were measured at 101.33 kPa using a modified Rose still. The thermodynamic consistency test was implemented by using the Herington method. Moreover, the VLE data for ethyl benzoate + o-xylene, ethyl benzoate + m-xylene, ethyl benzoate + p-xylene, and ethyl benzoate + ethylbenzene were correlated using the nonrandom two-liquid (NRTL) and universal quasichemical activity coefficient (UNIQUAC) models using the nonlinear least-square method. The obtained NRTL and UNIQUAC model parameters of the binary systems were utilized to predict the VLE data for the quinary system. It was shown that all the models showed a relatively small deviation from the experimental results, and the quinary predicted values obtained in this way agreed well with the experimental values, indicating that the experimental data were suitable for designing the extractive distillation process of ethyl benzoate with ethylbenzene and xylene isomers.
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TALANTA
·
2023
·
IF 6.1
Haoyu Long,Yanhao Jiang,Yanjuan Liu,Yuefei Zhang,Wei Chen,Sheng Tang
In this work, 2,4,6-tris(4-aminophenyl)-1,3,5-triazine (TAPT) and 1,3,5-tris(4-formylphenyl)benzene (TFPB) were used as monomers to construct a triazine-containing imine-linked covalent organic framework (COF), which was then bonded onto the surface of aldehydized silica (SiO 2 –CHO), and finally a COF@silica composite material (TAPT-TFPB COF@SiO 2 ) was successfully prepared. The chromatographic separation performance of SiO 2 –CHO, TAPT-TFPB COF@SiO 2 and TAPT-TFPB COF@SiO 2 /SiO 2 –CHO (80/20, mass ratio) was evaluated and compared. It was found that separation efficiency was obviously enhanced by adding an appropriate amount of SiO 2 –CHO into TAPT-TFPB COF@SiO 2 . The obtained TAPT-TFPB COF@SiO 2 /SiO 2 –CHO showed more favorable separation ability than SiO 2 –CHO and TAPT-TFPB COF@SiO 2 . Various aromatic compounds including alkylbenzenes , polycyclic aromatic hydrocarbons , environmental endocrine disruptors , foodborne stimulants and phenyl ketones were effectively separated on the TAPT-TFPB COF@SiO 2 /SiO 2 –CHO column in reversed phase chromatography mode. The silica microspheres surface-modified with triazine-containing imine-linked COFs proved to be a new type of promising chromatographic packing materials.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Zhenxing Cai,Jixiang Liu,Hui Zhao,Lingyan Wang,Xiaobo Chen,Chaohe Yang
At a pressure of 101.33 kPa, isobaric vapor–liquid equilibrium data for binary mixtures of propylene carbonate with para-xylene, ortho-xylene, meta-xylene, and ethylbenzene were obtained. Via a modified Othmer still apparatus and gas chromatography, the fractions of the vapor and liquid phases at equilibrium were measured. The experimental findings were fitted with the Wilson, NRTL, and UNIQUAC activity coefficient models, and the binary parameters of these models were calculated. The fitted models predicted the vapor–liquid equilibrium, and the calculated values agreed well with the experimental results. The Wisniak L-W and van Ness methods were used to authenticate the thermodynamic consistency of the equilibrium data.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Yajun Wei,Tan Zhao,Jiawei Wang,Yanli Chen,Qiang Wang,Xizheng Liu,Yunfeng Zhao
The development of an ultramicroporous (<7 Å) adsorbent with a narrow pore distribution for capturing and adsorbing gas molecules has received a lot of attention. In this paper, the commercial carbon molecular sieve (CMS) was used as the precursor, and a carbon molecular sieve (CMS-A-5) with better performance was obtained by activating with potassium hydroxide (KOH). After activation, the ultramicroporous volume increased from 0.163 cm3 g–1 (CMS) to 0.329 cm3 g–1 (CMS-A-5), and the CO2 capacity increased from 42.76 to 71.92 cm3 g–1 at 298 K and 1 bar. The breakthrough experiments demonstrated that the CO2 capture ability of CMS-A-5 increased by ∼9.5 times for the respiratory air containing CO2/O2/N2 (4:20:76) and was easily regenerated and reused. CMS-A-5 was also capable of selectively capturing VOC molecules including benzene, toluene, and C8 alkyl aromatics (BTEX) with a high adsorption capacity at a low pressure. The excellent CO2 and VOC molecule adsorption capacity make CMS-A-5 a promising candidate for selective separation of the gas mixture, in particular, for air purification in confined spaces.
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Catalysts
·
2023
·Vol. 13
·期 4
·781
·
IF 3.9
He Sun,Juping Zhang,Kongzhai Li,Hua Wang,Xing Zhu
HighlightsWhat are the main findings?A styrene yield of 91.4% was found for 10% k/CeO2at 500 °C and CO2-O2mixed atmosphere. The excellent catalytic performance of 10% k/CeO2is attributed to the alkali metal oxide modified cerium oxide and carbon dioxide induced oxygen vacancies to promote the dehydrogenation of ethylbenzene.What is the implication of the main finding?The proposed ODH strategy by using oxygen vacancies enriched catalysts offers an important insight into the efficient dehydrogenation of ethylbenzene at mild conditions.AbstractOxidative dehydrogenation (ODH) is an alternative for styrene (ST) production compared to the direct dehydrogenation process. However, ODH with O2or CO2suffers from either over-oxidation or endothermic property/low ethylbenzene conversion. Herein, we proposed an ODH process with a CO2-O2mixture atmosphere for the efficient conversion of ethylbenzene (EB) into styrene. A thermoneutral ODH is possible by the rationalizing of CO2/O2molar ratios from 0.65 to 0.66 in the temperature range of 300 to 650 °C. K modification is favorable for ethylbenzene dehydrogenation, and 10%K/CeO2achieved the highest ethylbenzene dehydrogenation activity due to the enhanced oxygen mobility and CO2adsorbability. The catalyst achieved 90.8% ethylbenzene conversion and 97.5% styrene selectivity under optimized conditions of CO2-4O2oxidation atmosphere, a temperature of 500 °C, and a space velocity of 5.0 h−1. It exhibited excellent catalytic and structural stability during a 50 h long-term test. CO2induces oxygen vacancies in ceria and promotes oxygen exchange between gaseous oxygen and ceria. The ethylbenzene dehydrogenation in CO2-O2follows a Mars-van Krevelen (MvK) reaction mechanism via Ce3+/Ce4+redox pairs. The proposed ODH strategy by using oxygen vacancies enriched catalysts offers an important insight into the efficient dehydrogenation of ethylbenzene at mild conditions.Keywords:ethylbenzene;oxidative dehydrogenation;ceria;CO2
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