SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Meilin Yin,Zhen Li,LiPeng Wang,Shaokun Tang
The fabrication of structural stable metal organic frameworks (MOFs) with large pore size by facile, rapid and environmentally friendly synthetic method remains a serious challenge. Herein, it is the first time to develop a novel synthetic strategy that rapidly enlarges the pore size of microporous ZIF-8 by employing polyvinyl pyrrolidone (PVP) as a modulator to induce defect formation in environmentally friendly supercritical CO 2 (scCO 2 ). Notably, the high solubility and low mass transfer resistance of reactants in scCO 2 and low surface tension nature of scCO 2 are the key factors for the rapid preparation of structural stable PVP/ZIF-8 with hierarchically pores. And the PVP modulator as a weak ligand not only facilitates pore size but also perturbs coordination to form coordination defects, exposing more coordination metal sites. These characteristics are beneficial to fast diffusion and adsorption of CO 2 molecules. In addition, the influences of reaction conditions on the morphology, pore parameter and CO 2 adsorption performance of PVP/ZIF-8 are investigated. The result indicates that the PVP/ZIF-8 prepared with 1:1 of Zn/PVP mass ratio at 90 °C and 30 MPa in supercritical environment have the highest CO 2 adsorption equilibrium capacity (2.02 mmol CO 2 /g sorbent) and great cycle stability, which should be attributed to hierarchically porous structure with interconnected macropores and micropores.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiaoya Zang,He Li,Yubao Zhang,Yong Chen,Yong He,Nengyou Wu,Xuebing Zhou,Deqing Liang
To enhance the CO 2 separation efficiency of hydrate-based gas separation (HBGS) technology, the kinetic process of hydrate formation from synthesized CH 4 /CO 2 /N 2 gas mixtures in the presence of cyclopentane (CP) and tetra-n-butyl ammonium bromide (TBAB) and gas separation efficiency were studied at an initial pressure of 7.0 MPa and temperatures ranging from 275.1 to 290.1 K. The crystallographic properties of the mixed hydrates were also evaluated by Raman, powder X-ray diffraction(XRD) and cryo-scanning electron microscop(cryo-SEM). Results showed that the combination of CP and TBAB tended to inhibit the separation efficiency compared with pure CP. The maximum CH 4 recovery was 1.37 and the CO 2 split ratio was 0.791 when using CP and TBAB solution. The order of CO 2 split ratio in the different systems followed the order SDS > CP > TBAB/CP > CP/SDS > TBAB. Meanwhile, the adsorption capacity and gas consumption also decreased with an increase in TBAB concentration. Raman and XRD tests revealed that sI, sII, and semi-clathrate hydrates were found to coexist after hydrate formation and no other types of hydrates was formed. CH 4 could only enter the small cages (5 12 ) of the hydrate. SEM images showed that the hydrate crystals were ellipsoid-shaped with different sizes and stacked together to form a globular structure, suggesting that the specific surface area of the hydrate crystals enhanced with the increasing of TBAB concentration. These findings can be used to evaluate the feasibility of applying TBAB and CP in HBGS technology.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Xuanyu Ji,Alberto Tiraferri,Xiaofei Zhang,Peng Liu,Zhiwei Gan,John C. Crittenden,Jun Ma,Baicang Liu
Knowledge on the composition and characteristics of dissolved organic matter (DOM) in complex shale gas wastewater (SGW) is critical to evaluate environmental risks and to determine effective management strategies. Herein, five SGW samples from four key shale gas blocks in the Sichuan Basin, China, were comprehensively characterized. Specifically, FT-ICR MS was employed to provide insights into the sources, composition, and characteristics of SGW DOM. Organic matter was characterized by low average molecular weight , high saturation degree, and low aromaticity. Notably, the absence of correlations between molecular-level parameters and spectral indexes might be attributed to the high complexity and variability of SGW. The unique distribution depicted in van Krevelen diagrams suggested various sources of DOM in SGW, such as microbially derived organics in shales and biochemical transformations. Moreover, linear alkyl benzene sulfonates , as well as associated biodegraded metabolites and coproducts, were identified in SGW, implying the distinct anthropogenic imprints and abundant microbial activities . Furthermore, high DOC removal rates (31.42–79.23 %) were achieved by biological treatment, fully supporting the inherently labile nature of SGW and the feasibility of biodegradation for SGW management . Therefore, we conclude that DOM in SGW is a complex but mostly labile mixture reflecting both autochthonous and anthropogenic sources .
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ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Shendong Liu,Danxuan Lin,Yunping Lai,Li Hou,Tianran Lin,Shulin Zhao
By combining the photothermal properties of the 3,3′,5,5′-tetramethylbenzidine oxidation product (TMBox) with the sensitive quenching of perovskite fluorescence by ammonia gas, a gas-mediated immunoassay at atmospheric pressure was constructed, which took the fluorescence quenching length of perovskite fluorescent capillary as the signal output. First, a CsPbBr3 perovskite with surface modification of 3-aminopropyl triethoxysilane was synthesized by thermal injection and decorated to the capillary wall by glutaraldehyde cross-linking. In the presence of H2O2 and the tumor marker carcinoembryonic antigen (CEA), TMB was oxidized to TMBox by the horseradish peroxidase (HRP)-labeled CEA antibody. The photothermal effect of TMBox at 808 nm laser irradiation increases the concentration of ammonia gas, and the prepared fluorescent capillary can respond sensitively to ammonia gas. The fluorescence quenching length can be observed by the naked eye for a semiquantitative evaluation of CEA concentration. At the same time, we developed a mobile APP for the first time to measure the fluorescence quenching length. In the range of 0–20 ng mL–1, the quenching length increased linearly with the increase in CEA concentration, and the detection limit was 0.078 ng mL–1. This method has been successfully used for the detection of CEA in human serum with a recovery of 95.8%–106.5%.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Gaoqiang Niu,Yi Zhuang,Yushen Hu,Zong Liu,Bo Wu,Fei Wang
Due to the complicated gas-sensing process on the surface of metal oxide semiconductors (MOS), it is hard to accurately characterize the transient changes of MOS gas sensor. This paper introduces a modified Hill equation to quantitatively analyze the instantaneous resistance of MOS gas sensors operating in temperature-pulsed operation mode, to extract the gas-sensing dynamic features and key parameters for the selective identification of various volatile organic compounds (VOCs) gases (such as ethanol, formaldehyde, toluene and acetone) by machine learning algorithms. The sensors were tested with the pulse-mode at different temperatures for multiple gases. The characteristic features of the sensing process during the pulse-on period were investigated. Key parameters were extracted via the modified Hill equation, which have shown obvious dependence on the gas type and concentration. Excellent selectivity for the VOC gases was attained at low concentrations of 500 ppb thanks to the equation's further integration with the principal component analysis (PCA) approach. The incorporation of this modified Hill equation in temperature-pulsed operation mode provides the vital features for the possible applications of MOS gas sensors with the emerging machine learning algorithm.
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BIOMATERIALS
·
2023
·
IF 14
Jingdong Rao,Xiaohui Mou,Yongyi Mo,Ho-Pan Bei,Li Wang,Chuyang Y. Tang,Kai-Hang Yiu,Zhilu Yang,Xin Zhao
Stenting is the primary treatment for vascular obstruction-related cardiovascular diseases, but it inevitably causes endothelial injury which may lead to severe thrombosis and restenosis. Maintaining nitric oxide (NO, a vasoactive mediator) production and grafting endothelial glycocalyx such as heparin (Hep) onto the surface of cardiovascular stents could effectively reconstruct the damaged endothelium. However, insufficient endogenous NO donors may impede NO catalytic generation and fail to sustain cardiovascular homeostasis . Here, a dopamine-copper (DA-Cu) network-based coating armed with NO precursor L-arginine (Arg) and Hep (DA-Cu-Arg-Hep) is prepared using an organic solvent-free dipping technique to form a nanometer-thin coating onto the cardiovascular stents. The DA-Cu network adheres tightly to the surface of stents and confers excellent NO catalytic activity in the presence of endogenous NO donors. The immobilized Arg functions as a NO fuel to generate NO via endothelial nitric oxide synthase (eNOS), while Hep works as eNOS booster to increase the level of eNOS to decompose Arg into NO, ensuring a sufficient supply of NO even when endogenous donors are insufficient. The synergistic interaction between Cu and Arg is analogous to a gas station to fuel NO production to compensate for the insufficient endogenous NO donor in vivo . Consequently, it promotes the reconstruction of natural endothelium, inhibits smooth muscle cell (SMC) migration, and suppresses cascading platelet adhesion , preventing stent thrombosis and restenosis. We anticipate that our DA-Cu-Arg-Hep coating will improve the quality of life of cardiovascular patients through improved surgical follow-up, increased safety, and decreased medication, as well as revitalize the stenting industry through durable designs.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Xiaowu Wang,Zhigang Zeng,Yu Fan,Xiaoer Wang,Shenghao Wang,Jiaqiang Xu
Sn 1−x S-CdS superlattice nanowires (NWs) with fast response and good selectivity in low-temperature operating environments for potential applications as gas sensing materials, were designed rationally and synthesized controllably. This work investigated in detail the dual selective gas sensing performance of Sn 1−x S-CdS superlattice nanowires that crystal facets change with the tunable composition . The results demonstrated that the Sn 0.38 S-CdS superlattice NWs with the structure of (0 0 4) lattice plane of SnS growing epitaxially along the [0 0 2] crystallization direction of CdS . And the gas sensors based on Sn 0.38 S-CdS superlattice NWs displayed the best gas sensing properties, including ultrafast response to acetone with 1 s at 290 °C, and good selectivity to H 2 S with selectivity value of 29886% at 190 °C. The gas sensing mechanism was carefully investigated by the chemical stability of gas molecules and the adsorption energy on the different crystal planes, as well as the energy band structure of the heterostructure . The study highlights an efficient rout to the development of high-performance multi-functional gas sensors.
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Food Packaging and Shelf Life
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2022
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IF 8.749
Yi-Cai Zhang,Qin-Bao Lin,Huai-Ning Zhong,Ying Zeng
Headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry (HS-SPME-GC-MS) was used to analyze volatile flavor compounds of yogurt packaged in carton. Volatile flavor compounds of off-flavor yogurt were compared with that of fresh milk, unpackaged yogurt, non-off-flavor yogurt, and its packaging materials. Furthermore, volatile flavor substances from paper packaging materials were analyzed by migration assay. Principal component analysis (PCA) and orthogonal partial least squares discriminant analysis (OPLS-DA) were used to describe the changes of volatile compounds in different kinds of yogurt and to identify the potential markers associated with the off-flavor of yogurt. A total of 30 volatile flavor compounds were identified in two kinds of off-flavor yogurt. Importantly, three flavor compounds: Nonanal, 2-ethyl-1-hexanol, and d-limonene were not only detected in off-flavor yogurt, but also in paper packaging materials, which indicated that these substances from paper packaging materials have a certain contribution to off-flavor yogurt. Migration assay combined with VIP values showed that ethanol and ethyl acetate contributed can be considered as the other indicators for the monitoring of yogurt quality.
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Chinese Physics B
·
2022
·Vol. 31
·期 11
·110704
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IF 1.652
Wenjun Yan,Zhishen Jin,Zhengyang Lin,Shiyu Zhou,Yonghai Du,Yulong Chen,Houpan Zhou
Li dendrites and electrolyte leakage are common causes of Li-ion battery failure. H2, generated by Li dendrites, and electrolyte vapors have been regarded as gas markers of the early safety warning of Li-ion batteries. SnO2-based gas sensors, widely used for a variety of applications, are promising for the early safety detection of Li-ion batteries, which are necessary and urgently required for the development of Li-ion battery systems. However, the traditional SnO2 sensor, with a single signal, cannot demonstrate intelligent multi-gas recognition. Here, a single dual-mode (direct and alternating current modes) SnO2 sensor demonstrates clear discrimination of electrolyte vapors and H2, released in different states of Li-ion batteries, together with principal component analysis (PCA) analysis. This work provides insight into the intelligent technology of single gas sensors.
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Journal of CO2 Utilization
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2022
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IF 8.321
Jiqing Dong,Ran Ping,Xun Dai,Dongchao Wang,Fusheng Liu,Shanshan Du,Mengshuai Liu
The combination of pyrrolidine-2,5-dione-derived ionic liquids with silver acetate (AgOAc) were developed as binary catalysts for conversion of simulated flue gas CO 2 and propargylic alcohols to α-alkylidene cyclic carbonates . By tuning different catalyst components, the [HTMG][Pyrro]/AgOAc system was confirmed to be the most efficient and exhibited an excellent synergistic action in facilitating the carboxylic cyclization under room temperature and solvent-free conditions. The influence of reaction parameters on carboxylic cyclization of CO 2 with 2-methylbut-3-yn-2-ol were optimized. Under the determined conditions, the [HTMG][Pyrro]/AgOAc system was stable enough to show durable high activity in eight recycles, and also versatile in carboxylic cyclization of flue gas CO 2 with other propargylic alcohols. Moreover, a thorough comparison of [HTMG][Pyrro]/AgOAc with the reported catalysts was provided and evaluated, the results suggested that the developed catalytic system has significant advantages in practical application. Finally, the mechanistic details for the conversion of CO 2 into α-alkylidene cyclic carbonates catalyzed by [HTMG][Pyrro]/AgOAc was also elucidated on the basis of reactants activation.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Shenghong Wang,Changan Zhou,Guoqiang Shu,Yongda Cao,Li Fan,Lei Song,Kui Ma,Hairong Yue
Electrocatalytic water-gas shift reaction (EWGSR) at room temperature and atmospheric pressure is an emerging process for high-pure hydrogen production without an additional H 2 separation procedure. Therefore, developing efficient electrocatalysts of EWGSR is one of the critical factors for its wide applications. Herein, the effects of support and calcinated temperature on the EWGSR performance are highlighted by systematically investigating the Pt/γ-Fe 2 O 3 , Pt/CeO 2 , Pt/TiO 2 , and Pt/α-Fe 2 O 3 catalysts. The results reveal that the γ-Fe 2 O 3 supported Pt catalyst (calcined at 400 °C) exhibits the lowest anodic onset potential and the highest activity compared to these prepared catalysts, and the mass activity is 3.5 times as high as 20% Pt/C. Furthermore, the onset potential for the EWGSR shows a strong correlation with the active O in the amorphous PtOx structures, where the active O atoms can promote the activation of the OH − and reduce the onset potential of the reaction. The significantly enhanced catalytic performance and durability are more responsible for the exposed Pt 0 and the weak adsorption of CO on the Pt/γ-Fe 2 O 3 catalyst. This study provides a new and promising route for designing excellent Pt catalysts for EWGSR in the hope that it can be helpful to the scholars in this orientation.
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EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Ruiyuan Wang,Qingquan Liu,Qi Peng,Xiaoyu Yang,Hongwei Zhao,Hui Fan,Huan Liu,Xinxiu Cao
Porous organic polymers (POPs) have potential applications in gas capture and storage to solve the challenges including decreasing the emission of greenhouse gases and storing green energies. However, they mainly rely on the surface of pores to adsorb gas molecules, and the inner space of the pores is underutilized. Herein, we synthesized two azo-bridged porphyrin POPs with a linear (PPAPP) and bent (PDAPP) backbone, respectively. The Fourier transform infrared (FT‐IR) spectra and the element content analysis shows that the extent of reaction of PPAPP is higher than that of PDAPP. The Brunauer-Emmett-Teller surface area of PPAPP is almost 4 times higher than that of PDAPP. Nevertheless, the CH 4 and CO 2 uptake capacity of PDAPP is equal to or higher than that of PPAPP. The reason for this is that PDAPP contains many traps. Traps with a large inner space and small sized doors could act as mazes for gas molecules. Gas molecules could enter the traps, but it is hard to get out of them. As a result, traps could act as containers for gas molecules. Our research suggests that POPs with traps are potential high-efficiency gas uptake materials because the inner space of the pores could be utilized.
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