MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2023
·Vol. 224
·期 23
·2300251
·
IF 2.5
Huiping Qi,Yanzhen Liu,Shi Shen,Jiafei Zhao
Green polymer poly- l -proline, as a new type of biodegradable polymer material, has a wide application prospect in the field of environmental protection. Recent studies have shown that poly- l -proline can also act as a green inhibitor that is highly effective in inhibiting the production of gas hydrates in oil–water systems. As a natural polymer material, poly- l -proline has good biocompatibility and biodegradability and will not cause pollution to the environment. It is found that adding an appropriate amount of poly- l -proline to the oil–water system can significantly inhibit the formation of gas hydrates. This is because poly- l -proline can reduce the concentration of dissolved gases in water by adsorbing and dispersing ions and molecules in water, thereby reducing the chance of gas forming hydrates with water. In addition, poly- l -proline can also prevent gas molecules from entering water molecules to form hydrates by forming hydrogen bonds with water molecules. This study provides a green, environmentally friendly and efficient solution for controlling the formation of gas hydrates in oil–water mixtures. In the future, the application prospects of poly- l -proline in oil–water separation, marine engineering, natural gas exploitation, and other fields will be broader.
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AICHE JOURNAL
·
2023
·
IF 3.7
Jingwei Zhang,Jianhong Xu,Zhuo Chen
Micro-packed beds have the advantages of excellent heat and mass transfer efficiency and high safety, which have been successfully applied to hydrogenation and oxidation reactions. The dispersion behavior of multiphase flow is closely related to mass transfer and reaction performance. However, the study of dispersion law in micro-packed beds is not sufficient. This work investigated the dispersion behavior of gas–liquid/liquid–liquid two-phase flow in micro-packed beds. The average size and distribution of droplets/bubbles were measured in different systems. Key parameters that affect the dispersion characteristics of the two phases were observed experimentally, including gas/liquid phase flow rate, size of the packing, and physical parameters of the systems. The experimental results showed that gas–liquid and liquid–liquid dispersion processes exhibited different characteristics due to the different physical parameters of liquid and gas as the dispersed phase. The fracture driving force of the gas–liquid process was mainly from the continuous liquid phase, while the fracture driving force of the liquid–liquid process came from both the dispersed phase and the continuous phase.
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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Mingmai Bao,Jiahui Bai,Ying Wang,Suzhen Zhu,Yingchao Liu,Tianlun Wen,Jing Zhang,Shuang-cheng Ma,Yinlong Guo
Liquid chromatography–mass spectrometry (LC-MS) is widely used in the detection of pesticide residues. However, the detection sensitivity of low-polarity pesticides by commonly used electrospray ionization may be severely suppressed, which greatly affects the limit of detection and repeatability. Herein, a plasma-excited nebulizer gas-assisted electrospray ionization (PENG-ESI) device has been developed. By introducing the discharge plasma formed by Tesla coil into the electrospray nebulizer gas channel, the sensitivity of low-polarity pesticides was significantly increased while maintaining sensitivity to polar pesticides. Under the optimized conditions, the limit of detection for S-bioallethrin was achieved at the level of 100 pg/g with good linearity (R2 > 0.99) and precision (RSD ≤ 4.61%). The matrix effect of a series of spiked matrix samples is less than 13.1%. Finally, different pyrethroid pesticide residues were successfully analyzed without separation, highlighting that the technology has potential application prospects in food quality control, environmental monitoring, and other fields.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Huicong Zuo,Chunqiang Lu,Lei Jiang,Xianming Cheng,Zhiqiang Li,Yuelun Li,Danyang Li,Hua Wang,Kongzhai Li
Linz-Donawitz converter gas (LDG), an important by-product in the steel industry with CO (55–60 vol%) and CO 2 (15–20 vol%) as the main components, is usually used as fuel for heating or power generation, releasing massive of diluted CO 2 with the concentration lower than 15 % that is difficult to capture. Herein, we propose a method to produce pure H 2 via chemical looping water splitting by using LDG as reducing agent, which can easily concentrate CO 2 for capture. Fe 2 O 3 , one of the most environmentally friendly and low-cost oxides, was chosen as the oxygen carrier to perform this concept. It was found that the addition of small amounts of Ce 0.75 Zr 0.25 O 2 solid solution could strongly improve the activity of Fe 2 O 3 for CO conversion, especially at relatively low temperatures. Compared with pure Fe 2 O 3 , the CO conversion and H 2 yield were increased from 39.5 % and 0.34 mmol·g −1 to 100 % and 2.32 mmol·g −1 at 650 °C, respectively, after adding 5 wt% of Ce 0.75 Zr 0.25 O 2 . The strong interaction between the two oxides contributed to the enhanced performance via promoting CO adsorption and lattice oxygen releasing. Water splitting assisted by air oxidation could fully regenerate the reduced oxygen carrier, and the oxygen carrier was stable during the long-term chemical looping process, with the CO 2 capture rate at ca. 95.8 %. In situ DRIFTS results showed that CO 2 was produced through a direct reaction of lattice oxygen with CO, and the decomposition of carbonate species intermediate by adsorption of CO on the surface of oxygen carriers. This study gave full evidence that it was feasible for achieving H 2 generation and CO 2 capture in one step via chemical looping reforming of reducing exhaust gases (e.g., LDG) from industrial emissions.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
J.Y. Yong,R.Y. Xie,Q. Huang,X.J. Zhang,B. Li,P.F. Xie,C.F. Wu,L. Jiang
Due to the superior CO 2 adsorption capacity and selectivity, amine-functional solid adsorbents have received increasing attention. Nevertheless, amine-functionalized polyporous materials have a large performance deviation when considering carbon removal capacity under wet flue gas. Therefore, a variety of metal–organic frameworks (MOFs) with amine functionality are synthesized in this work by appending diamine with a propylene linker to Mg 2 (dobpdc) (dobpdc 4- = 4,4′-dioxido-3,3′-biphenyldicarboxylate) and screened under the simulated flue gas environment with a high water content (7 v%). The results indicate that ndmpn-grafted Mg 2 (dobpdc) (ndmpn = N,N-dimethyl-1,3-propanediamine) has a high CO 2 adsorption capacity of 1.72 mmol/g at 60 °C with an extremely low regeneration heat (2.26 GJ/ton CO 2 at the desorption temperature of 145 °C). Adsorption property of ndmpn-Mg 2 (dobpdc) at high humidity is even more excellent than that of another well-reported diaminopropene-appended MOF, dmpn-Mg 2 (dobpdc) (dmpn = 2,2-dimethyl-1,3-propanediamine). Herein, van der Waals (vdW)-corrected density functional theory (DFT) calculations are used to quantitatively analyze binding strengths and water effects on it between diamine-appended Mg 2 (dobpdc) and CO 2 . It is revealed that the addition of water makes ammonium carbamate chains produced in ndmpn-Mg 2 (dobpdc) more stable. These chemisorption structures under humid conditions have also been disclosed by using 15 N solid-state nuclear magnetic resonance (NMR) spectroscopy experiments and DFT calculation. To conclude, we unveil the binary adsorption characteristics and mechanism of ndmpn-Mg 2 (dobpdc). It enables a thorough understanding of this compound and highlights its potential as a promising adsorbent under humid conditions for post-combustion applications.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 48
·105685-105699
·
IF 5.8
Dong Pei,Shan Peipei,Wang Shuaijun,Ge Baosheng,Zhao Chaocheng
In this work, efficient Fenton strategy have been proposed for degradation of shale gas fracturing flow-back wastewater using the spherical Fe/Al 2 O 3 supported catalyst. Prior to actual fracturing fluid treatment, the typical model wastewaters such as p -nitrophenol and polyacrylamide were employed to evaluate the catalytic properties of prepared catalyst, and then Fenton treatment of the shale gas fracturing flow-back wastewater was performed on the self-assembled catalytic degradation reactor for continuous flow purification. Results showed that under the conditions of 0.25 mol L −1 impregnating concentration, pH 4, 50 g L −1 catalyst and 0.75 mL L −1 30% H 2 O 2 , the removal efficiency of p -nitrophenol and polyacrylamide reached 74% and 61%, respectively, while the COD removal of fracturing flow-back fluid was approximately 48% with the residual 88 mg L −1 COD, meeting the emission standards of the integrated wastewater discharge standard (GB 8978-1996, COD < 100 mg L −1 ). This work offers new alternatives for Fenton treatment of real wastewater by efficient and low-cost supported catalysts.
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Journal of Water Process Engineering
·
2021
·
IF 5.485
Jialin Chen,Ruina Zhang,Dong Chen,Jianyong Liu,Shanping Chen
The generation process for the highly reductive carbon dioxide radical ( CO 2 − ) in the Fe(III)-oxalate system is enhanced under UV irradiation and used in nitrate (NO 3 − ) reduction with improved product selectivity to nitrogen (N 2 ). The combination of Fe(III) and residual oxalate forms Fe(III)-oxalate complexes again for an Fe(II)/Fe(III) species cycle and achieves generation of CO 2 − radical continually. The electron paramagnetic resonance (EPR) spectrum demonstrates the existence of CO 2 − radicals in this process. Some of the important control factors, such as initial concentrations of ferric ions (Fe(III)) (0.5, 1, 2, and 3 mM), NO 3 − (14, 21, and 42 mg N/L), oxalate (3, 7, and 10 mM), and pH values (2, 3, 4, 5, and 6), are systematically assessed for NO 3 − reduction efficiency and N-species selectivity. Among all the control factors mentioned, pH is a key parameter with an important role in the NO 3 − reduction process. Excellent NO 3 − reduction efficiency (∼90 %) was achieved at pH 3 in the presence of 1 mM Fe(III) and 10 mM oxalate under UV irradiation for 120 min. High Fe(III) and oxalate concentrations promote NO 3 − removal. In addition, there was an increase in the NO 3 − removal amount with a greater initial NO 3 − concentration. About 60 % of NO 3 − can be selectively reduced to N 2 with low selectivity to NO 2 − (∼3.4 % of total N) and NH 4 + (∼15.7 % of total N). In general, the UV/Fe(III)-oxalate system provided an alternative way to improve NO 3 − removal performance and selectivity to form N 2 in water and wastewater remediation processes.
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PROTEOMICS
·
2021
·Vol. 21
·期 10
·2000196
·
IF 3.984
Minqi Chen,Zhongqiu Liu,Lingzhi Gong
Plasticware and glassware used in the sample processing stage could result in different analysis performance for macromolecules, which led to the speculation that a similar effect could happen to small molecules. To confirm the speculation, pooled human plasma sample spiked with and without metabolite standards was prepared with three most commonly used container materials (glass, deactivated glass and polypropylene) supplied by different manufacturers after a two-step liquid-liquid extraction, followed by gas chromatography mass spectrometry (GC–MS) based untargeted and targeted metabolomics. The results showed that both GC–MS-based targeted and untargeted metabolomics could be influenced significantly by not only the container material but also the manufacturing procedures employed by different vendors. As a general guideline, it would be highly practical to use the same type of container from the same manufacturer during a whole project. Our study could be extremely valuable for the fellow researchers when dealing with the sample containers for GC–MS-based untargeted and targeted metabolomics.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yanling Wang,Yongfei Li,Qian Wang,Longhao Tang,Lei Liang,Yijin Zeng,Jincheng Lan,Ning Xu
Gas condensate reservoir plays an indispensable role in the supply of fossil fuels to alleviate energy shortages. However, liquid condensate near the wellbore can lead to a decrease in gas well deliverability during development. In this work, the strong gas-wetting graphene oxide is prepared by functional modification and characterized by FTIR and XPS . Thermodynamic analysis shows that surface modification can improve the temperature resistance of graphene oxide. To investigate the influence of gas-wetting alteration on the core, the contact angle of the droplets on the core surface is measured and the results exhibit that the contact angles of water and n-hexadecane increase from 23° and 0–140° and 132°, respectively. Meanwhile, the surface free energy is sharply reduced from 67.97 mN/m to 1.15 mN/m after treatment. These results are further verified by imbibition . Core flooding illustrates that the required pressure for water and n-hexadecane injection into the core is reduced by 57.06% and 54.08%, respectively, and the permeability of different cores is improved after the gas-wetting alteration. Also, the analyses of the 3D morphology and elements demonstrate that the gas-wetting adsorption layer has been formed on the core surface. These results indicate that the liquid is easier to peel from the core surface to improve the ability of transportation and distribution. Besides, this work also reveals the mechanism of gas-wetting alteration so that it can be better applied to other oil fields and engineering fields.
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ACS Applied Bio Materials
·
2021
·
IF 0
Yuhong Lin,Wukun Zhong,Min Wang,Ziyi Chen,Chunhua Lu,Huanghao Yang
Multifunctional cancer treatments based on gas therapy combined with other cancer treatments have gained tremendous attention and hold great promise in biomedical applications. In this study, a carbon monoxide-releasing nanoplatform combined with near-infrared (NIR) laser-triggered photothermal therapy (PTT) was constructed. The nanoplatform was composed of manganese pentacarbonyl bromide (MnCO)-loaded g-carbon nitride/polypyrrole (CNPpy) nanomaterials (MnCO@CNPpy). MnCO can be triggered to produce CO under H2O2 conditions. Upon exogenous NIR light stimulation and tumor microenvironment-overexpressed H2O2, MnCO@CNPpy exhibited excellent CO generation performance and photothermal effect. The generation of CO induced intracellular oxidative stress and caused cell apoptosis. Additionally, photoacoustic (PA) imaging was performed to track the delivery and accumulation of the nanomaterial in tumor sites because of the great photothermal conversion of CNPpy. The presented MnCO@CNPpy nanoplatform displayed desirable PTT and CO therapy in the inhibition of tumor growth and may provide a promising strategy for multifunctional antitumor synergistic treatments.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xiaoxiao Chen,Mengyao Liu,Lijuan Zhang,Yunshan Zhou,Enming Ping,Chunyan Ding
ZIF-67@NH 2 –SiO 2 composites were prepared by loading the metal-organic frameworks ZIF-67 on amino modified SiO 2 gel particles (NH 2 –SiO 2 , 80–100 mesh) through layer-by-layer self-assembly method. Systematic investigation on the effects of ZIF-67 loading amounts on NH 2 –SiO 2 packed stainless steel chromatographic column (specification 1.0 m×2.0 mm I.D.), the flow rate of He as carrier gas and the injection amount of mixed gas (H 2 /D 2 ) on the hydrogen isotope H 2 /D 2 separation performance at liquid nitrogen temperature, unraveled the optimal conditions for H 2 /D 2 isotope separation . The results showed that the optimal stationary phase materials under the optimized conditions can effectively separate H 2 and D 2 with separation resolution R = 1.52 and the separation time t = 10.15 min. The superior performance of the ZIF-67 is tentatively thought to be due to kinetic quantum sieving (pore size 3.3 Å) effect and chemical affinity sieving effect of Co ion in ZIF-67.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 96
·期 6
·1732-1741
·
IF 3.174
Zhiguo Sun,Jiaming Fan,Run Feng,Menglu Wang,Yue Zhou,Li Zhang
BACKGROUND In recent years, the emission of volatile organic compounds (VOCs) from different sources has caused huge environmental problems. As a ‘green’ terminal treatment technology, photocatalytic technology is a competitive technology that has practical application prospects for the emission reduction of VOCs. The core problem of photocatalysis technology is constructing a photocatalyst with higher activity. RESULTS In this work, a new hierarchical heterostructured photocatalyst of TiO 2 /Bi/Bi 2 MoO 6 was facilely fabricated by solvothermal method with the TiO 2 nanoparticles uniformly distributed on the surface of flower-like Bi 2 MoO 6 nanospheres. Compared with the bare flower-like Bi 2 MoO 6 nanospheres, the band gap width of TiO 2 /Bi/Bi 2 MoO 6 is wider, which helps to improve the Fermi level-derived oxidation–reduction capacity of the catalyst. N 2 adsorption–desorption experiments show that the composite material has a larger specific surface area, which is beneficial to improve the mass transfer efficiency in the gas–solid heterogeneous reaction. Photocatalytic data display that, under irradiation by Xenon lamp for 2 h, the degradation rate of toluene gas over TiO 2 /Bi/Bi 2 MoO 6 reached 26.08%, which is 17.92% higher than that of the bare Bi 2 MoO 6 nanospheres. CONCLUSION These results indicate that coupling TiO 2 could significantly enhance the photocatalytic degradation effect of toluene over the hierarchical heterostructured TiO 2 /Bi/Bi 2 MoO 6 , and this has practical application prospects for the use of photocatalytic technology to treat VOCs pollution. © 2021 Society of Chemical Industry
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