ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2020
·Vol. 28
·期 10
·12909-12917
·
IF 3.056
Ren Jingyu,Li Jie,Lv Lei,Wang Jian
Ionic liquids (ILs) are a kind of promising extractants for removing undesirable organics from industrial wastewater and crude oil, etc. Herein, IL regeneration by ozonation was proposed for its recycling. 1-Butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF 4 ) and phenol were used as the representative IL and organic matter, respectively. The regeneration performance, stability of [Bmim]BF 4 , and roles of hydrogen bonds between O 3 and [Bmim]BF 4 in the phenol removal were studied. The experimental results showed that 90.2% of phenol was degraded in [Bmim]BF 4 after ozonation treatment for 30 min with the O 3 concentration of 1.2 mg/L. The nonvolatility of [Bmim]BF 4 -made phenol was adequately degraded, while the concentration of phenol increased during ozone treatment in the conventional extractants (ethanol, ethyl acetate, and dichloromethane) due to their high volatility. The reuse experiments, spectra of Fourier transform infrared spectroscopy and 1 H nuclear magnetic resonance spectroscopy indicated that [Bmim]BF 4 was steady under the ozonation process. Density functional theory simulation confirmed that hydrogen bonds between [Bmim] + and O 3 could be formed, and calculational results of Hirshfeld charges indicated that the nucleophilicity of O 3 was enhanced by the hydrogen bonds. The enhanced nucleophilicity resulted in the increase of phenol degradation efficiency by ozonation, and the synergistic effect between O 3 and ILs was proportional to the hydrogen bond donor ability of ILs.
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Processes
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2020
·Vol. 8
·期 9
·1021
·
IF 2.753
Daiyin Yin,Shuang Song,Qi Xu,Kai Liu
The matrix/fracture conductivity of a fractured low-permeability reservoir is variable, and its heterogeneity is serious. When carrying out deep profile control measures, it is difficult to inject under the premise of ensuring the plugging effect. According to the characteristics of the fractured low-permeability reservoir in Chaoyanggou Oilfield, the polymer/chromium ion deep profile control system was optimized via a viscosity evaluation experiment, liquidity experiment and oil displacement experiment. The experimental results show that the high molecular weight main agent/low concentration system and low molecular weight main agent/high concentration system can meet the gel strength requirement. The evaluation results of the injection ability and plugging performance of the fractured low-permeability core show that a high molecular weight profile control system is difficult to inject, while a low molecular weight profile control system has a poor plugging performance and high cost after simulated shear. Therefore, the formulation of the profile control system was determined to be a polymer with a molecular weight of 16 million g·mol−1as the main agent with a concentration of 1000–1500 mg·L−1. As assisting agents, the concentrations of thiourea, NaCl and NaHCO3were 900 mg·L−1, 800 mg·L−1and 700 mg·L−1, respectively. The plugging rate of the system was 87.6%, and the resistance coefficient was 19.2. Finally, a fractured low-permeability core model with parallel long cores was designed, and the optimal profile control system was used for the core oil-displacement experiment. Compared with the water-flooding experiment, the plugging rate can be increased by 6.9–8.0%.Keywords:fractured low-permeability reservoirs;polymer/chromium-ion;deep profile control system
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Yujiao Tu,Suping Wang,Xiaotian Yuan,Yingying Xiang,Kunhao Qin,Yunlin Wei,Qi Zhang,Xuemei Chen,Xiuling Ji
The blue fluorescent nitrogen, phosphorus doped carbon dots ( Tg N,P-CDs) deriving from Thelephora ganbajun Zang were successfully obtained by hydrothermal method . Tg N,P-CDs possessed excellent fluorescence features and displayed strong blue fluorescence emission at 444 nm under 356 excitation with good water solubility. Tg N,P-CDs exhibited low biotoxicity and excellent biocompatibility by live/dead bacterial differentiation, cell imaging and onion epidermal staining. Furthermore, the nanoprobes showed high selectivity and sensitivity in detecting 2,4-dinitrophenol (2,4-DNP) and 4-nitrophenol (4-NP), and excellent linear range of 0–50 μM (R 2 = 0.9923) and 0–50 μM (R 2 = 0.9926) with low detection limits of 35.09 nM and 78.62 nM for 2,4-DNP and 4-NP, respectively. The Tg N,P-CDs was successfully applied to determine 4-NP and 2,4-DNP in real water and soil samples. It revealed that the inner filter effect quenching mechanism dominated in quenching of Tg N,P-CDs fluorescent by 2,4-DNP and 4-NP. It provides a new insight on the bioimaging application and environmental pollutant detection.
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JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Rong Liu,Qing Luo,Zhongqiu Liu,Lingzhi Gong
Liquid chromatography tandem mass spectrometry has been a widely used technique for quantifying oligonucleotides in biological samples. However, lack of simple and efficient sample cleanup approach remains a challenge. Our study aimed to evaluate the major factors during the sample pretreatment process for developing optimal sample preparation workflow for oligonucleotides. In this study, we have employed a model formed with rat plasma containing a 16 mer oligonucleotide standard in order to comprehensively optimize the sample preparation procedures. These included liquid-liquid extraction (LLE), solid-phase extraction (SPE), protein precipitation (PPT) and LLE combined with SPE. LLE with phenol: dichloromethane (2:1, v:v) was found to be the most efficient sample cleanup procedure with low cost and less toxicity. Followed by the extraction, ethanol precipitation (-80 °C, 5 min) was determined to be the optimal drying conditions. Also, mass spectrometric parameters were tuned to optimal conditions. It was found that the central composite design suite was proved to be highly practical for optimizing MS parameters. Finally, the thoroughly optimized sample preparation workflow was fully validated. The developed assay provided a quantitative range of 0.25–1000 nM, with accuracy and precision were < 7.45% and < 12.20%, respectively. Matrix effect and carryover were also evaluated and no significant effect was observed.
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ACS Omega
·
2020
·
IF 2.87
Zheng Shen,Yishan Gao,Ling Kong,Minyan Gu,Meng Xia,Wenjie Dong,Wei Zhang,Xuefei Zhou,Yalei Zhang
Amine-modified Sn-β was synthesized to improve the yield of lactic acid produced from Scenedesmus. After studying the growth of Scenedesmus, we selected Scenedesmus with the highest sugar content of 46.7% after 8 days of culture as the reaction substrate. The results showed that the yield of lactic acid from Scenedesmus was greatly increased after being catalyzed by 3-aminopropyltrimethoxysilane (APTMS)-modified Sn-β. After the pretreatment of Scenedesmus in an ice bath ultrasound, under the optimal reaction conditions (190 °C and 5 h), the yield of lactic acid reached the highest (37%). The acid–base characterization results of the catalyst confirmed that there are both Lewis acidic sites and medium-strength basic sites in the catalyst. Both of these sites can promote the hydrolysis of Scenedesmus, while the Lewis acidic sites can promote the production of lactic acid and the basic sites can effectively inhibit the production of the byproduct 5-hydroxymethylfurfural (HMF). This study proved that this amination catalyst is a useful strategy to increase the yield of lactic acid.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2020
·
IF 4.551
Jun Yao,Ming Xie,Yang Li
In order to protect human health from the threat of excessive acrylamide in heat-processed foods, swift, uncomplicated, highly selective and sensitive online monitoring methods for acrylamide are urgently needed. In this study, a rare earth metal/transition metal-organic frameworks Eu/Zr-MOFs fluorescence sensor with dual-band luminescence was prepared by the solvothermal method for detection of acrylamide in fried potatoes and cookie crumbs. This sensor exhibited two different fluorescence emission peaks at 430 and 615 nm under excitation of 365 nm, and the ratio of fluorescence intensity was linear with the experimental concentration of acrylamide in the range of 1 × 10 −4 to 1 × 10 −3 M. Under the optimal conditions, the proposed fluorescence analysis method showed that the detection limit of acrylamide was as low as 2.4 × 10 −8 M, and the satisfactory recoveries of 94.05–104.04% were obtained for various spiked samples. More importantly, the sensor has ultra-high selectivity for the detection of acrylamide while other small organic molecules hardly interfere with it in the measurement environment. These studies confirmed that the ratiometric fluorescence sensing method was expected to achieve on-line rapid detection of acrylamide in real foods. In addition, the mechanism of Eu/Zr-MOFs sensing of acrylamide was analyzed and discussed in depth, and the analog computation was carried out by Materials Studio software, and the entire sensing system was studied at the micro level in combination with density functional theory.
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JOURNAL OF LIQUID CHROMATOGRAPHY & RELATED TECHNOLOGIES
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2020
·
IF 0.992
Shiyun Tang,Yuanxing Duan,Feng Chang,Wei Jiang,Fengmei Zhang,Zhihua Liu,Yuting Yang,Chunbo Liu,Yingzhuang Chen
The porous layer open-tube (PLOT) columns, which were characterized by their considerable specific surface area and high permeability, have attracted a growing attention from researchers in liquid chromatography. In this work, a hydrophilic PLOT column rich in carboxylic acid functional groups was successfully synthesized in capillary with an inner diameter of 200 µm by thermally initiated aqueous two-phase polymerization. Methacrylic acid (MAA) areas monomers that responsible for the introduction of polar functional groups, and poly(ethylene glycol) diacrylate (PEGDA) are as cross-linker. The optimized PLOT column has a uniform, moderately thick porous layer, which is tightly bonded to the inner wall without any detachment. The hollow structure gives the PLOT column good permeability, which facilitates fast mass transfer. The systematical evaluations of the resulting PLOT columns were performed by using polar analytes including nucleosides, bases, amides, phenols and carboxylic acids. Those results demonstrated excellent separation performance for the small polar molecules. Compared to the poly(PEGDA) PLOT column, the hydrophilic retention of analytes on poly(PEGDA-co-MAA) porous layer open-tube column is significantly improved by the introduction of carboxylic acids. Furthermore, with modified nucleosides and chlorophenols being disease markers and the persistent pollutant of wide concern, respectively, the separation was optimized and the linear range of the quantitative analysis was examined for both targets. which indicates the potential application of such PLOT column for analysis of real samples.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2020
·
IF 4.872
Liyang Yao,Ling Chen,Bolu Chen,Yizhou Tang,Yu Zhao,Shanji Liu,Hengyi Xu
Titanium dioxide nanoparticles (TiO 2 NPs) are amongst the most frequently used nanomaterial in everyday consumer products, and their widespread applications have raised concerns of the consequent deleterious effects on human health, particularly to vulnerable populations, such as lactating females remains elusive. Therefore, this study was initiated to investigate the detrimental effects and toxic mechanisms induced by TiO 2 NPs in maternal dams and offspring during the lactation period. Dams were randomly divided into three groups. The water (Control; Group I) and TiO 2 NPs (100 mg/kg; Group II) were orally administered from postnatal day 1–20, respectively. The results indicated that TiO 2 NPs could cause toxicity in the dams, such as pathological damages to mammary gland tissues. The excessive accumulation of TiO 2 NPs could induce oxidative stress in the mammary gland, leading to the dysfunctional blood-milk barrier; besides, TiO 2 NPs could also be transferred to offspring via breastfeeding, causing abnormal development of infant. We further accessed the possible underlying molecular mechanism; for this, we orally administered TiO 2 NPs with vitamin E (100 mg/kg; Group III). The results revealed that toxicity induced by TiO 2 NPs was rescued. Collectively, this study presented the deleterious pathological effects of oral exposure to TiO 2 NPs in the mammary gland tissues and blood-milk barrier via the production of reactive oxygen species (ROS) in dams and developmental concerns in offspring. However, the administration of VE could mitigate the toxic effects induced by the TiO 2 NPs.
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Qi Zhang,He Mei,Wantong Zhou,Xuedong Wang
Herein, we provide the first report on the effects of Ce 3+ addition on the fluorescence of copper nanoclusters (CuNCs), which have excellent optical properties and lower toxicity as compared to AgNCs and AuNCs. We synthesized glutathione-encapsulated copper nanoclusters (GSH-CuNCs) using a simple one-pot chemical reduction approach. The excitation/emission wavelengths of the GSH-CuNCs were 350/650 nm. Introduction of Ce 3+ triggered an aggregation-induced emission of GSH-CuNCs due to formation of GSH-CuNCs-Ce 3+ complexes, resulting in a prominent fluorescence enhancement (~42-fold) of the mixed system. Fluorescent intensities (FIs) for the GSH-CuNCs-Ce 3+ system were significantly quenched by introduction of p -nitrophenol ( p -NP). The aforementioned quenching mechanism resulted from an inner-filter effect producing nearly unchanged fluorescence lifetime and overlap between UV–Vis absorption of Ce 3+ and the excitation wavelength of GSH-CuNCs. Consequently, a GSH-CuNCs-Ce 3+ -based “ON-OFF” platform was constructed for fluorescent detection of p -NP in water matrices. Under optimized conditions (5-min incubation time, pH = 5.6, 20 mM Ce 3+ ), the FIs of the GSH-CuNCs-Ce 3+ system were linear for p -NP concentrations from 0.5 to 500 μM and achieved a low detection limit of 0.17 μM. Moreover, the as-constructed nanofluoroprobe demonstrated high stability and specificity to p -NP, thereby offering a simple, cheap and robust experimental method for conventional monitoring of p -NP at trace levels in real-world water samples.
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Analytical Methods
·
2020
·Vol. 13
·期 1
·133-140
·
IF 2.596
Jinna Zhang,Haiyang Wang,Longhua Xu,Zhixiang Xu
A novel mesoporous fluorescent molecularly imprinted sensor for selective detection of bisphenol A (BPA) in food materials was fabricated via a semi-covalent imprinting method. The imprinting precursor that served as an alternative template molecule for BPA was prepared via thermally reversible isocyanate bonding, which effectively improved the imprinting efficiency for the molecularly imprinted sensor. Carbon dots (CDs) were embedded in mesoporous silica as signal recognition elements that exhibited quenching upon BPA binding. Subsequently, through the sol–gel process, the molecularly imprinted layer was coated on the CDs silica layer and provided specific recognition sites for BPA. The composite of CDs embedded in the mesoporous molecularly imprinted polymer (CDs@MIP) was characterized with scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller measurements and thermogravimetric analysis. The mechanism of carbon dots quenching and the high selectivity of CDs@MIP towards BPA were explored. The linear response range of the sensor was from 0.025 mg L−1 to 2 mg L−1 with a limit of detection of 0.016 mg L−1. The method was successfully applied for the determination of food samples and recoveries ranged from 92.5% to 101.1%. The BPA contents in actual samples were determined using high performance liquid chromatography and the proposed sensor, showing no significant difference between the two methods.
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Journal of Water Process Engineering
·
2020
·
IF 3.465
Xuerui Bai,Maiqian Nie,Zhenjun Diwu,Hongyun Nie,Yan Wang
Pseudomonas stutzeri N2 and Rhodococcus qingshengii FF were combined to enhance phenol degradation, and the interaction mechanism of microorganisms was investigated. The cells in the culture of mixed strain degrading 1000 mg/L phenol exhibited a rapid growth and proliferation, and the maximum cell density of mixed strain was 34.6 ± 0.3% and 60.8 ± 0.2% higher than the single strain N2 and strain FF respectively. The degradation of phenol by mixed strain was completed within 24 h, and the phenol mineralization efficiency was up to 84.9 ± 0.4%. In addition, two ring-cleavage products of catechol accumulating from the culture of mixed strain were markedly reduced. Through the analysis of intermediates and functional groups, the enhanced phenol degradation by mixed strain was found to mainly depend on the synergistic effect of strain N2 served as an oxidant and strain FF acted as a reductant. Based on the synergic mechanism, the mixed strain might be used as a promising bacterial agent for removing phenolic compounds from the industrial wastewater.
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CHEMOSPHERE
·
2020
·
IF 5.778
Xiaoping Liao,Caixiang Zhang,Chao Nan,You Lv,Zenghui Fan,Lisong Hu
Manganese oxides (MnO 2 ), important environmental oxides, have drawn significant attention in areas such as detoxification of micro-hazardous organic contaminants with electron-donating functional groups such as –OH. However, studies on whether these oxidized processes might further impact the fate of some esters like organophosphorus pesticide (OPPs) remain poorly understood. Herein, we propose a new mechanism involved in the enhanced removal of methyl parathion in mixtures of MnO 2 and phenol. Specifically, the removal of methyl parathion (up to 73.7%) was significantly higher for a binary system than for MnO 2 alone (approximately 9.3%) and was primarily due to adsorption rather than degradation. The extent of methyl parathion adsorption was dependent significantly on pH, reactant loading and metal ion co-solutes (such as Ca 2+ , Mg 2+ , Fe 3+ and Mn 2+ ). Both spectroscopic (FT-IR, SEM-EDX and XPS) and chromatographic (LC/HRMS) analyses showed that the remarkable increase in the number of organics (e.g., polymers) onto the MnO 2 surface dominated methyl parathion adsorption via hydrogen bonding, n-π and π-π interactions, van der Waals forces and pore-diffusion. The results from this study provided evidence for the role of manganese oxides in adsorption of methyl parathion in soil-aquatic environments involving phenolic compounds .
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