JOURNAL OF SEPARATION SCIENCE
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2016
·Vol. 40
·期 2
·514-523
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IF 2.741
Chaoyi Wang,Pan Zou,Ting Zhang,Haipu Li,Zhaoguang Yang
In this work, an in situ acylation combined with solid-phase microextraction coupled to gas chromatography and mass spectrometry method has been developed for simultaneously determining haloanisoles (2,4,6-trichloranisole, 2,4,6-tribromoanisole), and their direct precursors (2,4,6-trichlorophenol, 2,4,6-tribromophenol) and indirect precursors (2-chloropenol, 2,4-dichlorophenol, 2-bromophenol, 2,4-dibromophenol) in water. The key parameters for the solid-phase microextraction were determined by using Plackett–Burman screening and optimized by central composite optimization. Under optimal conditions, the eight compounds can be analyzed in a short time (33 min) with a strong linearity ranging from 2 to 200 ng/L (correlation coefficient greater than 0.996), showing good sensitivities with the limit of detection in a range of 0.23–0.91 ng/L and a limit of quantification of 0.77–3.03 ng/L, good repeatability (2.00–9.10%) and interday precision (1.67–11.3%). When environmental water samples were treated, the recoveries of target compounds were 75.5–127.3%, suggesting that the developed method could be applied in probing the origin of haloanisoles and monitoring halophenols and haloanisoles in natural waters at concentration levels of ng/L.
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APPLIED ENERGY
·
2017
·
IF 7.182
Zheng Li,Dong-Liang Zhong,Yi-Yu Lu,Jin Yan,Zhen-Lin Zou
This work presents an investigation of using tetra- n -butyl phosphonium bromide (TBPB) semiclathrate hydrate for CO 2 capture from simulated shale gas that is composed of 40% CO 2 and 60% CH 4 in mole fraction. The experiments were performed in a stirred tank reactor with the mass fraction of TBPB ( w TBPB ) varying from 5.0% to 33.2%. The phase equilibrium data of TBPB semiclathrate hydrate formed in the presence of the 40% CO 2 /CH 4 gas mixture were measured and reported. The effects of TBPB concentration on gas solubility, hydrate formation kinetics, and CO 2 separation efficiency were investigated in the temperature range of 278.1–284.2 K with the initial pressure fixed at 2.8 MPa. The results indicated that at a fixed driving force (overpressure), the gas uptake obtained at the induction time was nearly constant, despite the variation in TBPB concentration, while the rate of hydrate formation increased with the increase in TBPB concentration. Compared to the results obtained at a mole fraction of 1% THF, it was found that enhanced hydrate formation kinetics, a higher CO 2 separation factor (31.7 ± 3.3), and a higher operating temperature (284.2 K) were obtained at the stoichiometric TBPB concentration ( w TBPB = 33.2%). Therefore, TBPB may be used as a promising promoter for hydrate-based CO 2 capture from the simulated shale gas (CO 2 /CH 4 gas mixture).
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JOURNAL OF THE ENERGY INSTITUTE
·
2024
·
IF 5.6
Xu Zhao,Fuxin Yang,Wentao Li,Houzhang Tan,Lijuan Gao,Yanhao Jiao
With the urbanization and population growth, the disposal of plastic waste has become a significant challenge, as the traditional methods often result in pollution and resource wastage. Pyrolysis technology offers a sustainable solution by converting the waste plastics into valuable gas or liquid fuels. The co-pyrolysis of plastics and biomass is an effective approach for synergistically managing these two types of solid waste. The polyethylene (PE) and salix psammophila (SP) was used to investigate the gas production characteristics and polycyclic aromatic hydrocarbons (PAHs) formation during the co-pyrolysis. Additionally, Cu/ZSM-5, Co/ZSM-5, and Ni/ZSM-5 catalysts were employed to investigate the effects of different metal-loaded catalysts on the co-pyrolysis process. The results indicate that, with the increase of the pyrolysis temperature, the yield of gas-phase products gradually increases, solid residue decreases, and liquid-phase products initially increase before declining, reaching their maximum at 500 °C. The synergistic effect promotes the formation of C 2 H m (C 2 H 2 , C 2 H 4 , C 2 H 6 ) and CH 4 , leading to the increase of the gas-phase product yields compared to the individual pyrolysis. The addition of catalysts further enhances the gas production: Cu/ZSM-5 boosts H 2 yield, Co/ZSM-5 shows selectivity for CH 4 and C 2 H m , and Ni/ZSM-5 exhibits better selectivity for CO and H 2 . Under the various pyrolysis conditions, aromatic compounds and aliphatic hydrocarbons consistently dominate the liquid-phase products. With the increase of the pyrolysis temperature, the proportion of aliphatic hydrocarbons decreases, while the proportion of aromatic compounds increases. The addition of catalysts reduces the proportions of both aliphatic and aromatic compounds. PAHs generation is temperature-dependent, significantly increasing at 700 °C. At the low pyrolysis temperatures, the co-pyrolysis reduces PAHs yield, but at high temperatures, PAHs formation increases. The addition of catalysts decreases PAHs yield and toxicity equivalency. Cu/ZSM-5 promotes the cracking of two-ring PAHs, reducing two-ring PAHs yield. Co and Ni catalysts enhance the selective aromatization of small hydrocarbon molecules, forming low-ring PAHs and limiting PAHs aggregation. Overall, Ni/ZSM-5 demonstrates the best performance in enhancing gas production and reducing PAHs emissions, followed by Co/ZSM-5 and Cu/ZSM-5.
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LANGMUIR
·
2025
·
IF 3.9
Denghui Huang,Xiaolan Fu,Kaixin Wang,Zicheng Zheng,Liyuan Zhang,Zhizhen Ye,Jie Jiang,Zhong-kang Han,Liping Zhu
Oxygen vacancies play a crucial role in charge transport and surface states in semiconductor metal oxides, significantly influencing various research fields, such as photocatalysis and gas sensor. Developing effective strategies to generate oxygen vacancies and thereby enhance device performance is highly desirable. In this study, we proposed a water-based one-step electrospinning method to introduce hydroxyl groups, leading to the synthesis of Pt-decorated WO3 nanofibers (Pt-WO3(H2O)) with increased oxygen vacancies. Density functional theory calculations revealed that the dissociation energy of W–OH is lower than that of the W–O bonds, promoting the formation of oxygen vacancies via W–OH bond cleavage. These vacancies reduced the adsorption energy of acetone on the WO3 surface, enhancing surface interactions. Consequently, the Pt-WO3(H2O) sensor exhibited an ultrahigh response of 82 to 1.8 ppm acetone at 300 °C, which was about 1 order of magnitude higher than the one fabricated by conventional electrospinning. These findings indicate that water-based electrospinning is an effective technique for generating oxygen vacancies in metal oxide nanofibers. Our high-performance acetone sensor, capable of detecting low concentrations, holds great potential for applications in noninvasive health screening.
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Journal of Cleaner Production
·
2024
·
IF 9.7
Xin Li,Xifan Li,Guijing Chen,Di Zhang,Lun Tian,Jun Chen,Changhui Liu,Bo Li,Alberto Tiraferri,Baicang Liu
To minimize manganese loss during acid leaching and to enhance the lithium adsorption capacity from shale gas wastewater of H 1.33 Mn 1.67 O 4 , this adsorbent material was doped with metallic elements in this study. Doping was achieved using solid-phase synthesis, resulting first in a Li 1.33 R X Mn 1.67−X O 4 (R = Fe, Ni, Al) precursor powder through high-temperature calcination. Then, lithium was leached out under acidic environment to obtain the desired H 1.33 R X Mn 1.67−X O 4 (HMO-R) adsorbents. The equilibrium adsorption capacities of HMO-R powders were measured as 20.7 mg/g, 20.7 mg/g, and 29.0 mg/g, for Fe, Ni, and Al dopants, respectively, surpassing that of the former H 1.33 Mn 1.67 O 4 (13.7 mg/L). Moreover, an average reduction of manganese loss by 30% for HMO-R was observed during lithium recovery/extraction cycles by acid leaching compared to undoped Li 1.33 Mn 1.67 O 4 . Overall, the doped adsorbent exhibited a stable crystal structure and high adsorption capacity, enhanced stability, performance, and efficiency in cycling experiments with respect to the undoped material.
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Metabolites
·
2024
·Vol. 14
·期 4
·176
·
IF 3.4
Yuan Jing,Wei Chen,Xuebai Qiu,Shuyue Qin,Weichang Gao,Chaochan Li,Wenxuan Quan,Kai Cai
The quality of crops is closely associated with their geographical location and yield, which is reflected in the composition of their metabolites. Hence, we employed GC–MS pseudotargeted metabolomics to investigate the metabolic characteristics of high-, medium-, and low-yieldNicotiana tabacum(tobacco) leaves from the Bozhou (sweet honey flavour) and Shuicheng (light flavour) regions of Guizhou Province. A total of 124 metabolites were identified and classified into 22 chemical categories. Principal component analysis revealed that the geographical location exerted a greater influence on the metabolic profiling than the yield. Light-flavoured tobacco exhibited increased levels of sugar metabolism- and glycolysis-related intermediate products (trehalose, glucose-6-phosphate, and fructose-6-phosphate) and a few amino acids (proline and leucine), while sweet honey-flavoured tobacco exhibited increases in the tricarboxylic acid cycle (TCA cycle) and the phenylpropane metabolic pathway (p-hydroxybenzoic acid, caffeic acid, and maleic acid). Additionally, metabolite pathway enrichment analysis conducted at different yields and showed that both Shuicheng and Bozhou exhibited changes in six pathways and four of them were the same, mainly C/N metabolism. Metabolic pathway analysis revealed higher levels of intermediates related to glycolysis and sugar, amino acid, and alkaloid metabolism in the high-yield samples, while higher levels of phenylpropane in the low-yield samples. This study demonstrated that GC–MS pseudotargeted metabolomics-based metabolic profiling can be used to effectively discriminate tobacco leaves from different geographical locations and yields, thus facilitating a better understanding of the relationship between metabolites, yield, and geographical location. Consequently, metabolic profiles can serve as valuable indicators for characterizing tobacco yield and geographical location.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Leizhi Zheng,Xiemin Liu,Guoqiang Yang,Jia Liu,Bowen Jiang,Ying Liu,Xinyao Li,Xingbang Hu,Zhibing Zhang
The cycloaddition reaction of CO 2 in traditional reactors is relatively slow due to insufficient gas–liquid contact. In this work, the microdroplet reactor was set up to research the intensification effect of increasing the volumetric mass transfer coefficient on the reaction. The [C 1 C 2 Im][I]/PhOH (1-ethyl-3-methylimidazolium iodide/Phenol) with a molar ratio of 2:1 exhibited excellent catalytic activity at room temperature. Up to 85% conversion of the substrate could be achieved in the microdroplet intensification device. The intensification reaction model of the microdroplet was established, which explored the effect of the microdroplet size and gas–liquid mass transfer on the reaction. The increase of the volumetric mass transfer coefficient ( k La ) could improve the efficiency of the reaction at the gas–liquid interface of the microdroplet. The mathematical model of the microdroplet intensification reaction was established to clarify the intensification mechanism.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xue-Chun Yang,Xuan Yao,Shaqi Fu,Yuyan Cao,Tingzhan Wang,Martin Köckerling,Lingli Cheng,Zheng Jiao,Jing-Tai Zhao
Ethylene glycol (EG) is a widely used material, but its vapor is harmful to human health already in low concentrations. Thus, highly sensitive EG gas sensors are urgently needed. Herein, a series samples of ZnO and carbon dots (CDs) were synthesized at different ratios through a simple mechanical grinding method. The senor made using ZnO/CDs2 exhibits an ultra-high response (Ra/Rg) to 100 ppm EG up to 2798, 1378 and 467, and extremely low detection limit as low as 21 ppb, 13 ppb and 2 ppb, under UV light, visible light, and infrared light, respectively, as well as excellent repeatability and long-term stability. Especially, under UV light irradiation, the response of ZnO/CDs2 to 100 ppm EG is 24 times that of pure ZnO (Ra/Rg = 114.7), and more than 71 times that of 9 other gases. The outstanding gas sensing performance of ZnO/CDs2 can be attributed to the excellent light response ability of CDs at first, which greatly enriches the electron concentration in ZnO/CDs under light irradiation. Furthermore, the photo-induced electron transfer (PET) property of CDs and the p-n heterojunction formed at the interface between ZnO and CDs play a key role in rapid electron transport and transfer, avoiding a large number of electron hole recombination.
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ACS ES&T Engineering
·
2024
·
IF 7.4
Wenting Zhou,Yuanmiaoliang Chen,Dejun Feng,Lu Xiao,Xianhui Li,Zhangxin Wang
Membrane wetting induced by liquid absorbents severely hinders the practical applications of a gas–liquid membrane contactor (GLMC) for carbon dioxide (CO2) capture. To overcome this challenge, membranes with enhanced wetting resistance have been developed, but their CO2 absorption rates have often been overlooked. Herein, we unveil the interplay between membrane wetting resistance and the CO2 absorption rate for different GLMC membranes and elucidate the underlying mechanisms. Specifically, two representative membranes were used in this study: a polyvinylidene fluoride (PVDF) membrane with interconnected pores and an anodic aluminum oxide (AAO) membrane with disconnected pores. For each membrane, we modify it using fluoroalkyl silane agents with different chain lengths to obtain a range of membranes with different wetting resistances. Through GLMC tests, we identify a trade-off between membrane wetting resistance and the CO2 absorption rate for the PVDF membranes, i.e., an enhanced wetting resistance leads to a lowered initial CO2 flux. In contrast, for the AAO membranes, the CO2 absorption rate is independent of the membrane wetting resistance. Using electrochemical impedance and ultrasonic time-domain reflectometry analysis, the interplay between membrane wetting resistance and the CO2 absorption rate can be explained by the change of the gas–liquid interfaces in the GLMC membranes. This study reveals the critical role of the gas–liquid interface in GLMC for CO2 capture, providing valuable insights into membrane development for environmental applications of GLMC.
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Yuyan Hu,Boxue Wu,Ying-Shu Tang,Yi Wu,Li-Yan Liu
Background Sugar phosphates (SPx) play important role in the metabolism of the organism. SPx such as glycerate 3-phosphate, fructose 6-phosphate and glucose 6-phosphate in biological samples have the poor stability, similar structure and low abundance, which make their separation and detection more challenging. Method UiO-66-NH 2 and ZrO 2 coated SiO 2 (SBA-15) hard-core–shell adsorbents (UiO-66-NH 2 @SBA-15 and ZrO 2 @SBA-15) were synthesized, which were further used for dispersive solid-phase extraction for enriching the SPx in biological samples. The protocol was developed by UiO-66-NH 2 @SBA-15 and ZrO 2 @SBA-15 coupled with gas chromatography-mass spectrometry for the detection of trace SPx. The univariate experiment and response surface methodology were used to optimize the adsorption and desorption conditions. Results The adsorbents showed excellent adsorption capacity and specificity towards SPx, which were proved by adsorption and selective experiments. Under the optimized conditions, there were good linearity within the range of 5.0–5000.0 ng mL −1 , low limits of detection (0.001–1.0 ng mL −1 ), low limits of quantification (0.005–5.0 ng mL −1 ) and good precision (relative standard deviation less than 14.7 % for intra-day and inter-day). The satisfactory recoveries (89.1–113.8 %) and precision (0.5–14.6 %) were obtained when the sorbents were used to extract SPx from serum, saliva and cell samples. Moreover, UiO-66-NH 2 @SBA-15 was applied to the quantitative analysis of SPx from gastric cancer patients, because of a higher adsorption capacity (169.5–196.1 mg g −1 ). Conclusions UiO-66-NH 2 @SBA-15 showed great potential in the extraction of SPx in biological samples, which was beneficial to find out the metabolic change of SPx and explain the pathogenesis of the disease.
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JOURNAL OF CHROMATOGRAPHY A
·
2011
·
IF 4.194
Rongping Zheng,Hongman Zhang,Jing Zhao,Mingliu Lei,He Huang
Pretreatment is one of the most important steps in producing fuel ethanol from lignocellulosic biomass. Simple, fast and accurate quantification of byproducts in lignocellulosic hydrolysates is critical to optimize the pretreatment procedures, but still a challenge. In this paper, a new GC–MS (SIM) method based on a Deans switch has been developed for the determination of byproducts in a corn stover hydrolysate. The Deans switch was incorporated into a hardware system that facilitated the direct aqueous injection (DAI) on GC–MS system. Simultaneous chromatographic separation and quantification of 18 byproducts including four aliphatic acids, five furan derivatives, four phenolic compounds and five others were achieved within 45 min. The detection limits of the presented method for various byproducts were in the range of 0.007–0.832 mg/L. The within-day and between-day precisions of the method were less than 6.0% (RSD, n = 6). The accuracy of the method was confirmed with recoveries of 86–128%. A lignocellulosic hydrolysate sample of corn stover was successfully analyzed using this method, with aliphatic acids and furan derivatives accounting for 89.15% of the selected total byproducts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xiangchen Su,Xinrong Geng,Fang Li,Mingzhu Song,Ruizhen Lv,Yifei Zhang,Jiayu Yuan,Jia Dong,Yijie Shi,Liang Zhao
Due to the high-glucose environment of diabetic wounds, a significant proliferation of bacteria can occur, resulting in an inflammatory response that extends the inflammatory phase of the wound, thereby complicating the healing process in diabetic wounds. Eliminating the proliferation of bacteria plays a crucial role in promoting the healing of diabetic wounds. Under near-infrared (NIR) laser irradiation, l -arginine-modified natural product puerarin (Pue)-derived carbon nanoparticles ( l -Arg-CNP) not only exhibited excellent photothermal effects but also produced reactive oxygen species (ROS) to react with l -arginine ( l -Arg) for producing Nitric Oxide (NO), thus contributing to a synergistic antibacterial therapy in diabetic wound. At the same time, l -Arg-CNP retained Pue’s original characteristics to promote cell proliferation and angiogenesis. Following the loading of l -Arg-CNP into microneedle patches ( l -Arg-CNP@MN), it can deliver them into the deeper wound, effectively killing bacteria, reducing inflammatory infiltration, and promoting neovascularization at the wound site. It offers an effective therapeutic strategy for treating diabetic wound healing.
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