JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Qilong Xie,Jiangping Cao,Dekui Sun,Huaiqian Lu,Ming Xia,Bo Hou,Debao Li,Litao Jia
A sample preparation method for the extraction of bisphenol A (BPA) and tetrabromobisphenol A (TBBPA), potential endocrine-disrupting chemicals common in manufacturing, from environmental water samples was established by means of molecular-complex-based liquid-liquid microextraction coupled to high-performance liquid chromatography with diode array and mass spectrometric detection. In this method, tributyl phosphate acts as an extractant of BPA and TBBPA via hydrogen bond interactions. Additionally, no dispersants are needed. Attenuated total reflection Fourier transform infrared spectroscopy provides robust evidence for the formation of hydrogen bonds between the extractant and phenols in the molecular complexes, which supports the experimental results. Under optimised conditions, calibration plots were linear in the range of 0.05–2 μg mL − 1 , and detection limits ranged from 0.16 to 0.23 ng mL − 1 . The relative standard deviations of intra-day and inter-day repeatability were in the ranges of 3.5–4.9% and 5.1–6.8%, respectively, and recoveries ranged from 84.5 to 105.6%. The method we developed has been successfully employed in the measurement of BPA and TBBPA in four aqueous environmental samples.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2021
·Vol. 100
·期 8
·1747-1754
·
IF 2.007
Jing Li,Yanjun Jiao,Qin Luo,Weixin Hu,Shenwen Fang,Chunling Tang,Qiang Liu
During the exploitation of shale gas, there are many oil-based drill cuttings (OBDC) produced, which are hazardous waste. In this paper, the characteristics of OBDC were analyzed and 25 hydrophobic deep eutectic solvents (DESs) were prepared as extractants for treating OBDC. The results showed that the DES formed by lauric acid and thymol had the highest extraction efficiency. The significant parameters of the extraction process were studied by using total petroleum hydrocarbon (TPH) as an index and the rational extraction conditions were recommended as follows: 0.8:1 mole ratio of lauric acid to thymol, 10:1 mass ratio of DES to OBDC, and 1 h extraction time at 60°C. The TPH of OBDC can be decreased from 14.75 to 0.87 wt.% at this recommended condition. The high extraction efficiency was also confirmed by energy dispersive spectrum results of treated OBDC. In addition, the lauric acid/thymol DES can be recycled and the TPH was still smaller than 1% after three cycles. This research suggests that hydrophobic DES extraction is an effective technology for TPH removal from OBDC.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Xiaoyan Pei,Jiang Liu,Weihao Rao,Xiantao Ma,Zhiyong Li
Carbon dots (CDs) have attracted great attention in recent years owing to their potential applications in such as photocatalysts, organic synthesis, and bioimaging. However, it is always difficult for the separation and recycling of carbon dots from homogeneous reaction systems, which may limit their application in catalysis. A stimuli-responsive phase transfer of CDs is promising to solve these problems. In this work, we developed a novel class of CO2-responsive carbon dots decorated with different molecular weight polyetheramines (PEAs) (Mn = 230, 400, 2000 g/mol, respectively) and investigated their phase transfer behavior. It was found that PEA230-CD were well able to reversibly transfer between water and organic solvents by alternative bubbling and removal of CO2, the phase transfer efficiency of PEA400-CD was about 40%, and PEA2000-CD cannot transfer. The mechanism of the CO2-switched phase transfer involves the reversible reaction of PEA-functionalized CDs with CO2 and reversible formation of hydrophilic bicarbonates salts. As an example of applications, the phase transfer strategy was successfully applied in a Henry reaction by using the CDs as catalysts for efficient homogeneous catalysis, heterogeneous separation, and recycling of the CDs.
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CHINESE JOURNAL OF CATALYSIS
·
2021
·
IF 8.271
Dongdong Wang,Wanbing Gong,Jifang Zhang,Miaomiao Han,Chun Chen,Yunxia Zhang,Guozhong Wang,Haimin Zhang,Huijun Zhao
Catalytic hydrodeoxygenation (HDO) is one of the most promising strategies to transform oxygen-rich biomass derivatives into high value-added chemicals and fuels, but highly challenging due to the lack of highly efficient nonprecious metal catalysts. Herein, we report for the first time of a facile synthetic approach to controllably fabricate well-defined Ni-Co alloy NPs confined on the tip of N-CNTs as HDO catalyst. The resultant Ni-Co alloy catalyst possesses outstanding HDO performance towards biomass-derived vanillin into 2-methoxy-4-methylphenol in water with 100% conversion efficiency and selectivity under mild reaction conditions, surpassing the reported high performance nonprecious HDO catalysts. Impressively, our experimental results also unveil that the Ni-Co alloy catalyst can be generically applied to catalyze HDO of vanillin derivatives and other aromatic aldehydes in water with 100% conversion efficiency and over 90% selectivity. Importantly, our DFT calculations and experimental results confirm that the achieved outstanding HDO catalytic performance is due to the greatly promoted selective adsorption and activation of C=O, and desorption of the activated hydrogen species by the synergism of the alloyed Ni-Co NPs . The findings of this work affords a new strategy to design and develop efficient transition metal-based catalysts for HDO reactions in water.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 47
·51410
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IF 3.125
Yanying Hao,Guyue Wang,Xiaoxue Shui,Anping Tian,Yong Yang,Jin Zhu
A series of bio-based diester plasticizers with various alkyl chain asymmetry and the same molecular weight were designed and synthesized, using renewable 5-hydroxymethyl-2-furancarboxylic acid (HFCA) as the raw material. The chemical structures of the HFCA-based plasticizers were characterized by Fourier transform infrared and nuclear magnetic resonance ( 1 H NMR and 13 C NMR). Besides, the influence of alkyl chain asymmetry on plasticization properties of the HFCA-based plasticizers in poly(vinyl chloride) (PVC) blends was also investigated. It was found that increasing the alkyl chain asymmetry of the diester plasticizer and keeping the molecular weight unchanged simultaneously could further improve its plasticizing efficiency, without sacrificing its volatility resistance and exudation resistance. The results showed that this study provided a new approach for further optimizing the overall properties of the asymmetric diester plasticizers.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2021
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IF 5.455
Yingqian Wang,Jihong Sun,Tallat Munir,Bingying Jia,Anadil Gul
Clinoptilolite (CP) with various morphologies, such as spherical, flower, cylindrical, and disc-shape, were successfully synthesized in the presence of alcohol solvents with different carbon chain lengths. The structural and textural properties of the resultant CPs were characterized via XRD, SEM, TG-DSC profiles, TEM, NMR, FT-IR spectra, and N 2 sorption isotherms. The effect of the additive amount of various alcohol solvents on the induction (nucleation) periods and growth stages of synthetic CPs were detailed investigated. Their activation energies of induction ( E n ) and growth ( E g ) periods during crystallization intervals were calculated according to the Arrhenius equation, where the former being larger than the latter, indicating that nucleation is the key step during the whole synthesis of CPs. Particularly, the E n value gradually increased as the increasing chain-length of the used alcohol, but smaller than that without additive alcohols. These demonstrations implied that the presence of alcohol solvents is beneficial to promote the nucleation process of synthetic CP. Furthermore, their CH 4 and N 2 adsorption capacity and selectivity were preliminary explored, showing the highest selective factor of 5.58 at 0 °C for CH 4 /N 2 separation using flower-like CP as an adsorbent. These results suggested a promising adsorbent for wide applications in gas separation.
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ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Bin Lin,Huajing Liu,Chuixiu Huang,Xianjin Xiao,Stig Pedersen-Bjergaard,Xiantao Shen
Fluorescent aptamer beacons (FABs) are a major category of biosensors widely used in environmental analysis. However, due to their low compatibility, it is difficult to use the common FABs for biological samples. To overcome this challenge, construction of FABs with complex structures to adapt the nature of biological samples is currently in progress in this field. Unlike previous works, we moved our range of vision from the FAB itself to the biological sample. Inspired by this idea, in this work, flat membrane-based liquid-phase microextraction (FM-LPME) with sufficient sample cleanup and preconcentration capacities was integrated with FABs. With the merits of both FM-LPME and FABs, the integrated LPME-FAB system displayed a clear synergistic enhancement for target analysis. Specifically, LPME in the LPME-FAB system provided purified and enriched Hg2+ for the FAB recognition, while the FAB recognition event promoted the extraction efficiency of LPME. Due to superior performances, the LPME-FAB system achieved highly sensitive analysis of Hg2+ in urine samples with a detection limit of 27 nM and accuracies in the range of 98–113%. To the best of our knowledge, this is the first time that an integrated LPME-FAB system was constructed for target analysis in biological samples. We believe that this study will provide a new insight into the next generation of biosensors, where the integration of sample preparation with detection probes is as important as the design of complex probes in the field of bioanalysis.
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PubMed
高影响因子
POLYMER
·
2019
·
IF 3.771
Ming Zhang,Mingqing Chen,Zhongbin Ni
Currently, it remains a challenge to effectively improve the toughness of epoxy polymer without impairing the processability and other properties. Herein, a novel strategy was proposed for toughening epoxy polymer using the ordered microstructure formed by the self-assembly of C 8 H 17 -alkyl branched tri-carbamates with a spacer of isocyanurate ring at relatively low concentrations in the epoxy/amine system. The employed tri-carbamates slightly affects the viscosity of the modified epoxy due to its low molecular weight and melting behavior. The dendritic spherulites microstructures self-assembled in epoxy matrix through the desired molecular interactions between branched alkyl chains, –NHCOO– and C O act as the toughening materials that absorb fracture energy and subsequently improve the impact resistance of cured epoxy without significantly sacrificing Tg and mechanic strength . Moreover, due to the good plasticization of branched C 8 H 17 - chains and excellent mechanic strength of isocyanurate ring, in-situ dispersing tri-carbamates endows the modified epoxy the balanced cured properties.
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RENEWABLE ENERGY
·
2019
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IF 5.439
Yongcheng Huang,Yaoting Li,Xudong Han,Jiating Zhang,Kun Luo,Shangsheng Yang,Jiyuan Wang
In this paper, biodiesel was used to upgrade bio-oil by extracting the high-quality fuel fractions in bio-oil through solvent extraction . After the extraction, the upper layer blends of biodiesel and the high-quality bio-oil components, also called the “extraction phase liquid”, was obtained and denoted as EPBB. Firstly, Thermogravimetric (TG) and Fourier transform infrared (FTIR) analyses indicated that the light components originally in bio-oil, such as alcohols, ethers, ketones and carboxylic acids were extracted from bio-oil to biodiesel and formed the EPBB. Then the fuel properties of EPBB were measured at different temperatures. The results showed that the density of EPBB was higher, while its viscosity, surface tension and lower heating value (LHV) were lower than those of biodiesel. Accordingly, EPBB revealed better atomization and evaporation characteristics as compared to biodiesel. Finally, the engine performance of EPBB was tested on an unmodified direct-injection diesel engine. When compared with biodiesel, the ignition delay of EPBB was longer, the premixed combustion duration was longer, while the total combustion duration was shorter. The fuel economy of EPBB was comparable to that of biodiesel, and the NOx, soot, CO and UHC emissions of EPBB were all lower than those of biodiesel.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2019
·
IF 3.571
Xuan Xin,Mengmeng Zhang,Xiao-Feng Li,Guanglei Zhao
Enzymatic acylation is commonly used to increase the lipophilicity of flavonoids. However, the absence of primary hydroxyl groups makes it challenging to acylate baicalin using traditional acylation methods. In this study, an enzymatic esterification strategy was developed to introduce fatty-acid chains into baicalin at its carboxyl group, hence successfully synthesizing a new series of baicalin ester derivatives in nonaqueous media. Under the optimal reaction conditions, up to 95% conversion of baicalin was achieved. Antimicrobial evaluation of the baicalin ester derivatives indicated a corresponding increase to that of C log P values, with a cutoff effect at C log P = 5.2. Baicalin ester derivatives with C log P values of 4.9–5.2 exhibited the most potent antimicrobial activity. Interestingly, the introduction of medium-length fatty alcohol chains not only increased lipophilicity but also endowed them with membrane-disrupting properties. This study, therefore, provides an understanding of the esterification of flavonoid glycosides and a prospective application of the ester derivatives.
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PubMed
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INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Yunchang Fan,Zeyu Niu,Chen Xu,Lei Yang,Feiyang Chen,He Zhang
Haematococcus pluvialis , a green microalga, can accumulate high level of astaxanthin which is regarded as a super antioxidant extensively used in cosmetics, poultry, food, and pharmaceutical industries. The difficult point for extraction of astaxanthin is how to break the thick resistant cell walls of Haematococcus pluvialis effectively. In this work, this difficulty was successfully solved by the biocompatible protic ionic liquids-based microwave-assisted liquid-solid extraction (PILs-MALSE). Ethanolammonium caproate (EAC), a PIL used in here, can strongly dissolve mannan, one of the main components of the cell walls of Haematococcus pluvialis , which can leave out the pretreatment process to disrupt the cell walls before extraction, thereby leading to fast extraction (extraction time, 50 s). Furthermore, EAC has the obvious advantages over the imidazolium-based ILs, such as low cost, easy synthesis, and excellent biocompatibility. The PILs-MALSE method is more effective for the extraction of astaxanthin compared with conventional extraction techniques.
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Journal of Bionic Engineering
·
2019
·Vol. 16
·期 1
·38-46
·
IF 2.463
Zhang Xuemei,Fu Feng,Gao Xiaoming,Hou Xiufang
Magnetically driven super-hydrophobic materials were prepared by Fe 3 O 4 nanoparticles and stearic acid, which were deposited on the surface of polyurethane sponges. The presence of the Fe 3 O 4 nanoparticles makes the sponge have the magnetic, and the micro-nano hierarchical structure and hydrophobic functional groups lead to the sponge have excellent superhydrophobicity. The as-prepared sponge exhibited excellent absorption capacities for various oils and organic solvents ranging from 23.8 times to 86.7 times of its own weight. Moreover, the oil separation capacities still keep a high value after 50 cycles of squeezing the saturated absorbed as-prepared sponge. All of these satisfactory properties make the as-prepared sponge as a candidate of ideal absorbents for oily industrial wastewater and oil spills in oceans.
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危险品化学品经营许可证（带存储）