CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ting Huang,Yunyi Ge,Xiao Zhang,Boxiong Shen,Feng Shen
Water poisoning of catalysts presents a significant practical challenge in the removal of pollutants from coal-fired flue gas. Herein, a highly water-resistance Mn catalyst, with a structure of hollow spheres (NS) assembled by nanosheets and modified by inorganic siloxane was developed. The hydrophobic catalyst (Mn-Si 0.06 /NS) showed a 50% increase in VOC removal efficiency compared to Mn/Al 2 O 3 when exposed to wet flue gas containing 10 vol% water vapor. Strikingly, Mn-Si 0.06 /NS exhibited robust SO 2 resistance, especially under flue gas with high water vapor content. Mechanistic results shows that the enhanced water resistance of catalyst resulted from the synergy between morphological structure and the inorganic siloxane modification. DRIFTS and XPS analyses showed that the catalyst effectively prevented the water poisoning effect, which involves lattice oxygen consumption and transformation. The ability of catalyst to utilize oxygen under wet flue gas was also confirmed by product analysis, which revealed a clear preference for the oxidation reaction path of o-xylene compared with Mn/Al 2 O 3 . Molecular dynamics (MD) simulations show the dynamic scenario of VOC and water vapor adsorption on the catalysts and provide an intuitive picture of the catalysts' water resistance.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Liyong Du,Guoli Yang,Yi Liu
The research on the synthesis of three-dimensional (3D) porous structures has garnered significant interest among scholars. In this study, ZnSnO 3 /ZnO heterostructures are prepared using butterfly wings as biotemplates, resulting in the formation of a hierarchical porous network structure characterized by regular ridges and pillars. Subsequently, we construct a resistive gas sensor utilizing these ZnSnO 3 /ZnO heterostructures, which exhibits not only a relatively high responses (14.7) but also rapid response and recovery speed (1 s/6 s) when exposed to 100 ppm n-propanol at 220 °C. Furthermore, the sensor demonstrates a low limit of detection (LOD) of 432 ppb, strong repeatability, good long-term stability (80 days), and excellent anti-humidity properties (S 84 % /S 33 % ≈ 0.84). The enhanced gas sensing performance is primarily attributed to the formation of ZnSnO 3 /ZnO n-n heterostructures, the increase in oxygen vacancies, and the presence of ordered open porous structures. Consequently, ZnSnO 3 /ZnO heterostructures show significant potential for the detection of n-propanol gas in practical applications. This work also presents a promising strategy for the development of homogeneous/heterogeneous materials with a 3D open porous structure, which can be applied in surface-related fields.
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DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xifeng Zhu,Longchun Zhong,Yi Xiao,Yuan Liu,Jiawei Wang,Tao Wang,Wei-Ping Pan
To enhance the elimination of trace elemental mercury (Hg 0 ) from coal-fired flue gas, silver nanoparticles (AgNPs) were directionally anchored into the pores of MIL-101(Cr) using the double-solvent method (DSM) to achieve a highly dispersed fixed-bed adsorbent Ag@MIL-101 at room temperature. Various experimental characterizations were conducted to verify the Physical and chemical properties of the adsorbent, and fixed bed adsorption experiments evaluated the Hg 0 removal efficiency. Within the temperature range of 30–70 °C, Ag@MIL-101(Cr) achieved nearly 100 % Hg 0 removal efficiency, maintaining stability even at high concentrations of SO 2 (1500 ppm) and H 2 O (9 %). Density functional theory (DFT) revealed that the introduction of AgNPs greatly enhanced the adsorption capacity of MIL-101(Cr) for Hg 0 , with an evident electron exchange between Ag and Hg, and the adsorption energy changed from −36.91 kJ/mol to −68.59 kJ/mol. The interaction between Ag and Hg was a relatively strong weak interaction, which allowed for easy desorption at moderate temperatures (∼200 °C), significantly saving energy. Tests conducted with flue gas from an actual coal-fired power plant demonstrated that 2Ag@MIL-101(Cr) exhibited superior Hg 0 removal efficiency compared to activated carbon at the WESP outlet under low-temperature (about 50 °C) and high-humidity conditions, providing an efficient and economical solution for flue gas purification.
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高影响因子
CHROMATOGRAPHIA
·
2017
·Vol. 80
·期 3
·473-482
·
IF 1.402
Liu Haibo,Ousmane Diebate,Gan Ning,Wu Dazhen,Li Tianhua
Abstract This study aimed to simultaneously determine three β2-agonists (clenbuterol, salbutamol, and ractopamine) in pork samples using novel stir bar array sorptive extraction coupled with gas chromatography–mass spectrometry. Pencil refill was employed as the substrate of stir, which was covered with carboxyl graphene sheets and polyluminol coating. The coating was simply prepared by electrochemical deposition of luminol at a voltage of 0–0.6 V. Then, an automatic device with the stir bar array for extraction was used. The conditions for the extraction were optimized. Under the optimum extraction conditions, with toluene as the extraction solvent, the extraction and desorption times were 20 min. A good linearity of three β2-agonists was obtained in the range of 0.5–100 ng g −1 by gas chromatography–mass spectrometry detection. The recovery of clenbuterol, salbutamol, and ractopamine in spiked pork samples ranged from 88.7 to 93.2%, 85.5–94.2%, and 85.7–93.9%, respectively, with the relative standard deviations less than 10%. The detection limits were in the range of 0.022–0.091 ng g −1 for pork samples. The extraction coating with high extraction capacity was simply fabricated by the electrochemical method, which could simplify the pretreatment procedures. Moreover, the array could extract several samples simultaneously and improve the pretreatment efficiency. Graphical Abstract
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高影响因子
Catalysis Science & Technology
·
2021
·Vol. 12
·期 3
·737-749
·
IF 6.119
Zhicheng Xu,Yuran Li,Yuting Lin,Bin Wang,Panting Gao,Tingyu Zhu
The reduction of NO by CO was proposed to be applied for regeneration gas to remove NOx from industrial flue gas with activated carbon purification technology. To improve the activity and sulfur resistance for the reduction of NO by CO in regeneration gas, Cu and Fe modifications on activated carbon were investigated. And various samples were characterized by XRD, XPS, TPD, H2-TPR, in situ DRIFTS and DFT calculations to explain the reaction mechanism and poisoning mechanism. The synergistic effects of oxygen-containing functional groups and metal sites show that –COOH acts as an anchor site for metals and that C–O–C acts as a protective site for Fe3+ under a SO2 atmosphere. Cu2+ sites have a high activity at low temperatures due to the large amount of adsorbed NO and the intermediate NOx− participating in the reaction with the NOx− pathway. Fe3+ sites have a high activity at high temperatures due to the high N–O dissociation activity with the *N pathway and –NCO pathway. DFT calculations proved that the binding Cu2+ and Fe3+ sites have higher activity than free Cu2+ and Fe3+ sites. A high content of SO2 exhibits various poisoning effects, mainly including the sulfation of metal sites, deposition of S, and consumption of CO. AC-Fe-H exhibits excellent resistance and stability against SO2 and H2O due to less S deposition caused by consumption through the S–CO reaction, slight sulfation caused by the protective effect of Fe2+ and C–O–C on Fe3+ sites and better hydrophobicity.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2013
·
IF 2.004
Chao Chen,Xiao-Sen Li,Zhao-Yang Chen,Zhi-Ming Xia,Ke-Feng Yan,Jing Cai
The equilibrium hydrate formation conditions for ternary simulated flue gas [CO2 (0.1368) + N2 (0.8547) + SO2 (0.0085)] with SO2 aqueous solutions, and SO2 + tetra-n-butyl ammonium bromide (TBAB) aqueous solutions were measured using the temperature search method, over the temperature and pressure range of (272.85 to 283.15) K and (1.20 to 5.09) MPa, respectively. The corresponding equilibrium gas compositions were analyzed. The effects of SO2 concentration and TBAB additive on the hydrate phase equilibrium were studied. For the flue gas and SO2 aqueous solution, the presence of SO2 reduces the hydrate formation pressure. The higher is the SO2 concentration in aqueous solution, the easier the hydrate forms, and the higher the SO2 concentration in equilibrium gas phase is. N2 mole fractions in equilibrium gas phase are higher than that in the feed flue gas, while CO2 is lower due to its relative high solubility. For a given system, the equilibrium hydrates formation pressure increases with the increase in temperature. Both SO2 and N2 mole fractions in equilibrium gas phase decrease with the increase in pressure, while the CO2 mole fraction increases. TBAB solution with w4 = 0.050 not only reduces the equilibrium hydrates formation pressure markedly, but also helps the dissolution of SO2 in aqueous solution. The SO2 concentrations in equilibrium gas phase for the TBAB addition system are much smaller than those without TBAB addition. The pressure reducing effect of the TBAB promoter for SO2 containing flue gas is dependent on the SO2 concentration and smaller than that for flue gas without SO2. A small amount of SO2 produces a synergy with TBAB to promote the hydrate formation, but the high SO2 concentration produces an inhibition on the hydrate formation, and causes the hydrate equilibrium pressure increase. The optimum SO2 mass fraction in solution is lower than 0.010.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 18
·8155-8165
·
IF 3.591
Xiaoye Wen,Li Yan,Zhefeng Fan
As the environmental residues of formaldehyde and hypochlorites are very harmful to human health, a new simple and efficient aggregation-induced emission probe based on diaminomaleonitrile was designed and applied in the independent detection of hypochlorites and formaldehyde. The probe shows high selectivity and anti-interference ability against other potential competitive substances. ClO− promotes the oxidized splitting of CN in the probe, and induces evident color changes visible to the naked eye together with quenched fluorescence. The detection of ClO− by this probe was fast, sensitive, and visible to the naked eye. The detection limit of the probe to ClO− in the range of 0.70–20 μM is 18 nM. Through the condensation mechanism and with amine as the binding site of formaldehyde, the exposed amino group in the probe structure responds sensitively and efficiently to formaldehyde. The probe can effectively monitor 0.50–25 μM formaldehyde in aqueous solutions, with a detection limit as low as 42 nM. A portable solid sensor – a formaldehyde detection plate was built by directly covering the probe on a thin-layer chromatography plate. Thereby, formaldehyde gas can be effectively and sensitively detected, which offers a clue for developing solid-state formaldehyde-detection plates. The high experimental recovery rates prove that this new probe is highly promising in hypochlorite detection in the real water environment.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Fengying Shao,Li Mi,Zhaoyan Tian,Cheng Zheng,Yuanjian Zhang,Quan Li,Songqin Liu
The low solubility of oxygen in solution is the main obstacle for the biodegradation of organic pollutants in wastewater. To address this problem, inspired by the degradation mechanism of aerobic bacteria toward organic pollutants, a novel photodegradation system was presented and operated by a heterojunction photocatalyst combining with a hydrophobic triphase interface, allowing oxygen to directly diffuse from the gas phase to active catalytic sites submersed in polluted solutions. Especially, the heterojunction photocatalyst was fabricated by graphitic carbon nitride nanosheets (C3N4 NS) sensitized with 5,10,15,20-tetrakis(4-carboxylphenyl)porphyrin (TCPP). The resulting photocatalyst was coated on a certain part of the commercial superhydrophobic carbon paper (CP) and submersed in the polluted wastewater, while the other part of hydrophobic CP (without coating with C3N4-TCPP nanocomposite) was exposed to air to form a gas–liquid–solid tri-phase photodegradation system. With this system, the photodegradation rate was 10-fold higher than that of a conventional liquid/solid diphase system in oxygen-saturated solutions. This was, on one hand, due to the abundant oxygen on the surface of a photocatalyst coming from the fast and direct diffusion from the gas phase through the superhydrophobic nanoporous part of CP. On the other hand, the hybrid C3N4-TCPP nanocomposite enhanced the light absorption efficiency under simulated sunlight irradiation and restrained the recombination of photogenerated electron–hole. Moreover, the triphase photodegradation system was stable in aqueous solutions for a long time and can be reused almost without attenuation for five cycles, which provided a great potential to be utilized for practical wastewater treatment.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Baixian Lu,Ying Liu,Yanyu Zhang,Xiaoyu Tian,Chaoran Shao,Ruiyan Fan,Aimin Wang
Fe 0.3 Ni 0.7 -foam/ACF cathode coupled with GDE was fabricated to boost HEF performance. • The system realized 98.0% ENRO degradation in 90 min and 77.0% TOC removal in 360 min. • High-flux H 2 O 2 generation well matched the rapid Fe 2+ regeneration. • The final total iron leaching concentration stabilized at 0.53 mg L −1 . Conventional electro-Fenton (EF) technologies suffer from inherent pH sensitivity and massive iron sludge deposition. To address these drawbacks, a gas diffusion electrode integrated heterogeneous electro-Fenton (GDE + HEF) system was fabricated, where a high-flux H 2 O 2 -producing GDE was matched with a Fe 0.3 Ni 0.7 -foam/activated carbon fiber (ACF) composite cathode. This electrode architecture achieves low iron leaching of 0.53 mg L −1 along with high in-situ H 2 O 2 accumulation up to 47.19 mM, greatly outperforming the bare ACF counterpart. Mechanism analysis reveals that H 2 O 2 generated in-situ mildly etches the FeNi-foam substrate and drives the in-situ reconstruction of active iron nanosheets. Benefiting from this integrated design, the rigorous pH limitation of classic Fenton reactions is broken, and favorable catalytic performance with suppressed iron release is sustained over a broad pH window of 3.0–6.5. Under optimized conditions, the GDE + HEF system degrades 98.0% of 100 mg L −1 enrofloxacin (ENRO) within 90 min, with a 77.0% total organic carbon (TOC) removal efficiency after 360 min of reaction. Electron paramagnetic resonance (EPR) and radical quenching tests jointly confirms hydroxyl radicals ( • OH) as the dominant reactive oxygen species responsible for pollutant degradation. Furthermore, the stepwise oxidation pathways of ENRO are elucidated using ultra-performance liquid chromatography coupled with triple quadrupole mass spectrometry (UPLC-QqQ-MS). Featuring robust operational stability, the proposed system offers an efficient and practical route for the remediation of pharmaceutical wastewater.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yijun Xue,Wei Sun,Qian Wang,Limei Cao,Ji Yang
MOFs (metal-organic frameworks) are stable materials with both organic and inorganic pores, and possess high surface area fascinating structures. Owing to the unique octahedral of aluminum center and strong Al–O bonds, Al-based MOFs show excellent thermal stability. In this paper, MIL-96(Al) is proved to be effective at dispersing Pt particles evenly and sparsely as it is employed as catalyst support. MIL-96(Al) is synthesized via a water based route and different contents of Pt particles are directly deposited on the surface of MIL-96 in one step by hydrothermal method to prepare Pt X MIL-96 (x represents Pt content) catalysts. The catalyst are sprayed evenly on carbon paper, with Pt content of 0.03%, 0.11%, 0.27% and 0.41%, respectively, and are applied in a gas diffusion reactor with snakelike flow field for low temperature H 2 -SCR. For Pt 5 MIL-96/CP, the NO removal efficiency can reach up to 100% at 60 °C. Electron transfer between Pt and MIL-96 is observed via X-ray photoelectron spectron (XPS). It reveals that the deposited Pt is in metallic state. Meanwhile, the electronic structure of MIL-96 is kept intact in the process of Pt depositing. The excellent performance of Pt 5 MIL-96/CP catalyst strongly suggests its potential application.
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高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Cheng Wang,Lian Duan,Binwang Yang,Zhixiong Ye,Jianna Yu,Jiaxu Liu,Xiuqin Zheng,Qi Yang,Guoxin Jing,Wen Liu,Wenshan Li,Wenjie Liu
Herein, we develop a novel method using gas chromatography-ion mobility spectrometry (IMS) with an ammonia dopant for the determination of volatile N-nitrosamines in meat products. The IMS system was implemented with Fourier deconvolution multiplexing to simultaneously improve the resolving power and sensitivity. The ammonia dopant mitigated the formation of N-nitrosamine dimer ions, suppressing the ionization of interferents and shifting the reactant peak from hydrated protons to hydrated ammonium ions. The ammonium adduct product ions of N-nitrosamines were confirmed using time-of-flight mass spectrometry. The instrument limits of detection and quantitation for nitrosamines were 0.78–1.79 and 2.60–5.82 ng/mL, respectively, with recoveries between 71.39% and 110.59% using a simple water distillation method. The developed method showed satisfactory performance when applied to the detection of nitrosamines in various meat products.
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产品关联
DOI
PubMed
高影响因子
Plants-Basel
·
2025
·Vol. 14
·期 5
·708
·
IF 4.1
Zhongxiao Yue,Ruidong Zhang,Naihong Feng,Xiangyang Yuan
The flavour of foxtail millet (Setaria italica(L.) P. Beauv.) is an important indicator for evaluating the quality of the millet. The volatile components in steamed millet porridge samples were analysed using electronic nose (E-Nose) and gas chromatography–ion mobility spectrometry (GC-IMS) techniques, and characteristic volatile fingerprints were constructed to clarify the differences in the main flavour substances in different foxtail millet varieties (two hybrids and two conventional foxtail millets). After sensory evaluation by judges, Jingu 21 (JG) scored significantly higher than the other varieties, and the others were, in order, Jinmiao K1 (JM), Changzagu 466 (CZ) and Zhangzagu 3 (ZZ). E-Nose analysis showed differences in sulphides and terpenoids, nitrogen oxides, organosulphides and aromatic compounds in different varieties of millet porridge. A total of 59 volatile components were determined by GC-IMS in the four varieties of millet porridge, including 23 aldehydes, 17 alcohols, 9 ketones, 4 esters, 2 acids, 3 furans and 1 pyrazine. Comparative analyses of the volatile components in JG, JM, ZZ and CZ revealed that the contents of octanal, nonanal and 3-methyl-2-butenal were higher in JG; the contents of trans-2-butenal, 2-methyl-1-propanol, trans-2-heptenal and trans-2-pentenal were higher in JM; and the contents of 2-octanone, hexanol, 1-octen-3-ol, 2-pentanone and butyraldehyde were higher in ZZ. The contents of 2-butanol, propionic acid and acetic acid were higher in CZ. A prediction model with good stability was established by orthogonal partial least squares discriminant analysis (OPLS-DA), and 25 potential characteristic markers (VIP > 1) were screened out from 59 volatile organic compounds (VOCs). These volatile components can be used to distinguish the different varieties of millet porridge samples. Moreover, we found conventional foxtail millet contained more aldehydes than the hybridised foxtail millet; especially decanal, 1-nonanal-D, heptanal-D, 1-octanal-M, 1-octanal-D and 1-nonanal-M were significantly higher in JG than in the other varieties. These results indicate that the E-Nose combined with GC-IMS can be used to characterise the flavour volatiles of different foxtail millet, and the results of this study may provide some information for future understanding of the aroma characteristics of foxtail millet and the genetic improvement of hybrid grains.
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）