SURFACE AND INTERFACE ANALYSIS
·
2013
·Vol. 45
·期 7
·1152-1157
·
IF 1.22
Shuo Zhang,Dong Wang,Fang Bu,Xingwen Zhang,Pingping Fan
This work investigated the effect of counter-ions and interfacial turbulence on oxygen transfer from gas to liquid phase containing ionic surfactant, and experiments were performed in a mechanically stirred reactor with flat gas–liquid interface. Counter-ions in terms of hydration ability and polarizability influence the interfacial coverage of ionic surfactants (i.e. cetytrimethylammonium bromide (CTAB) and cetytrimethylammonium chloride) with the same hydrocarbon chain length, producing hindrance but in different extent on oxygen transfer. The addition of electrolyte (NH 4 Br) substantially reduced the interfacial tension and surface charge of micelles (zeta potential) in CTAB system, and this salt effect greatly compressed interfacial double layer leading to gas transfer inhibition. The surface charge, aggregation number as well as stability of micelles formed above the critical micelle concentration could also alter interfacial configuration of surfactant layer reflected by gas absorption rate. Liquid turbulence was analyzed to decide the role of surfactant present in water on gas–liquid mass transfer, since Marangoni instability effect playing positive role should be taken into consideration under moderate liquid flow, while in turbulent system, contribution of Marangoni effect became overshadowed and consequently surfactant pose ‘barrier’ effect on gas transfer due to its surface active nature. Copyright © 2013 John Wiley & Sons, Ltd.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 29
·10183-10189
·
IF 4
Wenhao Xing,Kaijin Kang,Jian Tang,Chunlan Tang,Wenlong Yin,Bin Kang,Jianguo Deng
Stability is a key factor that restricts the practical applications of metal–organic framework (MOF) materials. In this work, we report an ultrastable three-dimensional cage-like MOF, SrCu(HC3N3O3)2, constructed by a polydentate cyanurate ligand and two kinds of different metal nodes. A high ratio of coordination sites in organic ligands, specific coordination of strong acid with a strong base and weak acid with a weak base and double independent completed coordination networks endow SrCu(HC3N3O3)2 with outstanding thermal stability (up to 300 °C) and acid/alkali resistance (pH = 2–14). Moreover, SrCu(HC3N3O3)2 possesses the highest porosity up to 36.7% among cyanuric acid-based MOF materials and exhibits differentiated adsorption of C3H4 (63 cm3 g−1) and C3H6 (51 cm3 g−1). The breakthrough experiment further verified that efficient C3H4/C3H6 separation can be achieved under dynamic conditions by SrCu(HC3N3O3)2.
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SENSORS
·
2025
·Vol. 25
·期 9
·2634
·
IF 3.5
Mengxue Xu,Yihong Zhong,Hongpeng Zhang,Yi Tao,Qingqing Shen,Shumin Zhang,Pingping Zhang,Xiaochun Hu,Xingqi Liu,Xuhui Sun,Zhenxing Cheng
HighlightsWhat are the main findings?The problem of dichloromethane “poisoned” MOS materials was well solved.Gas sensing mechanism of dichloromethane on the MOS material was elucidate.What is the implication of the main finding?The best performance of significant response and excellent recoverability by the MEMS sensor to dichloromethane is attributed to a synergetic effect from Mo and Ni co-doping into SnO2.Kinetically, the transportation of dichloromethane molecules onto the surface determines the response process. Thermodynamically, the output steady electronic signal of the MEMS sensor follows the equations newly derived by statistical mechanics.The challenging problem of chlorine “poisoning” SnO2for poorly recoverable detection of dichloromethane has been solved in this work. The materials synthesized by Ni or/and Mo doping SnO2were spread onto the micro-hotplates (<1 mm3) to fabricate the MEMS sensors with a low power consumption (<45 mW). The sensor based on Mo·Ni co-doped SnO2is evidenced to have the best sensing performance of significant response and recoverability to dichloromethane between 0.07 and 100 ppm at the optimized temperature of 310 °C, in comparison with other sensors in this work and the literature. It can be attributed to a synergetic effect of Mo·Ni co-doping into SnO2as being supported by characterization of geometrical and electronic structures. The sensing mechanism of dichloromethane on the material is investigated. In situ infrared spectroscopy (IR) peaks identify that the corresponding adsorbed species are too strong to desorb, although it has demonstrated a good recoverability of the material. A probable reason is the formation rates of the strongly adsorbed species are much slower than those of the weakly adsorbed species, which are difficult to form significant IR peaks but easy to desorb, thus enabling the material to recover. Theoretical analysis suggests that the response process is kinetically determined by molecular transport onto the surface due to the free convection from the concentration gradient during the redox reaction, and the output steady voltage thermodynamically follows the equation only formally identical to the Langmuir–Freundlich equation for physisorption but is newly derived from statistical mechanics.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Shanjian Liu,Jia Liu,Wenjing Zhao,Wei Chen,Chengxizi Zhang,Weiming Yi
To synergistically achieve industrial flue gas resourcing and high-value biomass conversion, a novel process of cellulose-catalyzed nitrogen-rich pyrolysis mediated by oxygen-poor flue gas was proposed in this paper. A systematic investigation of the influences of O 2 concentration (1–7 vol%), temperature (450–600 °C), and the presence of Al-MCM-41 on the cellulose-urea co-pyrolysis for preparing nitrogen-containing compounds (NCCs) was conducted. Under optimal conditions (550 °C, 5 vol% O 2 ), the synergistic effect of mesoporous structure and acid sites of Al-MCM-41 transformed the product distribution from levoglucosan-dominated oxygenated compounds to high-value NCCs mainly comprising nitriles (25.3 %) and pyrazines (25.2 %). The relative content of NCCs reached 92.1 %, showing a 46.1 % increase compared to non-catalytic conditions. The process opens up a green and efficient synergistic path for the co-conversion of industrial waste gas and biomass, demonstrating significant industrial application value.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Zhengyi Chen,Gongke Li,Zhuomin Zhang
It remains a significant challenge for fast and high-throughput detection of trace analytes in complex samples with surface-enhanced Raman scattering (SERS) strategy due to the severe interference from matrices. In this work, a miniaturized array gas membrane separation (AGMS) device coupled with SERS was designed and drew up to eliminate matrix influence and improve the reproducibility of SERS signal during real sample analysis. The design of miniaturized AGMS tube was optimized based on quantitative calculation of its air permeability by computational fluid dynamics simulation. A 10 mm height tube was selected as an optimized design with a recovery of 98.3% for acetaldehyde. The practical feasibility of miniaturized AGMS was validated based on the applications in biochemical analysis and food analysis, such as albuminuria and acetaldehyde in urine sample and metaldehyde and thiram in food samples. The results showed that SERS responses of all analytes dramatically increased by eliminating sample matrices after miniaturized AGMS process. Acetaldehyde, albuminuria, metaldehyde and thiram in real samples could be accurately quantified with recoveries of 82.0–123.3%, and the analytical results were validated by corresponding standard methods with relative error ranging from −4.8% to 5.3%. Time consumption of miniaturized AGMS-SERS for one real sample analysis including sample preparation and determination was less than 20 min and could treat 96 samples with 45 min in one run. It is potential that the miniaturized AGMS technique automated by implementation with a robotic arm could greatly expand the range and accelerate the speed of SERS analysis.
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CLINICA CHIMICA ACTA
·
2014
·
IF 2.764
Jie Li,Yulan Peng,Yong Liu,Wenwen Li,Ya Jin,Zhentao Tang,Yixiang Duan
Background Breast cancer (BC) remains the most commonly diagnosed malignancy in women. We investigated 4 straight aldehydes in the exhaled breath as potential early BC diagnostic biomarkers. Methods End-tailed breath were collected by Bio-VOC® sampler and assayed by gas chromatography–mass spectrometry. Kruskal–Wallis one-way analysis of variance test and binary logistic regression were used for data analysis. The diagnostic accuracies were evaluated by receiver operating characteristic curves. A predictive model/equation was generated using the 4 biomarkers and validated by leave-one-out cross-validation. Results All four potential biomarkers demonstrated significant differences in concentrations between BC and healthy controls (HC) ( p < 0.05). The areas under the curves (AUCs) in HC vs BC I–II model using hexanal , heptanal, octanal , and nonanal were 0.816, 0.809, 0.731, and 0.830, respectively. The AUC for their combined use was 0.934 (sensitivity 91.7%, specificity 95.8%) in the early diagnosis of BC. The predictive model/equation exhibited good sensitivity (72.7%) and specificity (91.7%) in distinguishing between HC and BC (cross-validation: sensitivity 68.2% and specificity 91.7%). Conclusions The diagnostic values of 4 exhaled straight aldehydes as early diagnostic biomarkers for BC were successfully verified and the diagnostic accuracy improved in their combined use.
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高影响因子
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
·
2022
·Vol. 61
·期 45
·e202212338
·
IF 16.823
Long Kuai,Li Liu,Qingmei Tao,Nan Yu,Erjie Kan,Na Sun,Shoujie Liu,Baoyou Geng
The two-dimensional nanosheets are conducive to not only endow opened surfaces for loading active metal atoms but also boost the mass transfer for the heterogeneous reactions. The challenge is how to load and stabilize single-atoms on nanosheets in high-areal densities. This work reports an efficient micro-gas blasting (MGB) strategy to access versatile noble metal single-atoms/metal oxide nanosheets, including Ir 1 /CoO x , Pd 1 /CeO 2 , etc . Especially for Pt/CeO 2 nanosheets (Pt 1 /CeO 2 −S), the Pt loading is increased to 15 at%. The Pt 1 /CeO 2 −S catalysts from MGB are revealed to possess superior reactivity and tolerance in the model reaction of water-gas shift (WGS). The Pt 1 /CeO 2 −S catalyst exhibit 2–3 times reactivity that of their thicker counterpart, single-atom Pt 1 /CeO 2 microspheric catalyst. Moreover, the single-atom sites in Pt 1 /CeO 2 −S (1–10 %) catalysts are stable in a harsh WGS reaction condition of 10 % CO. This work thus paves a way to access the practical single-atom catalysts. Graphical An efficient and general micro-gas blasting (MGB) synthesis is developed to access versatile high-areal density noble metal single-atoms/metal oxide nanosheets, including Pt 1 /CeO 2 , Ir 1 /CoO x , Pd 1 /CeO 2 , etc. The as-prepared Pt 1 /CeO 2 −S catalysts are revealed to possess superior reactivity and tolerance than routinely structured alternatives by using water-gas shift (WGS) as a model reaction.
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COLLOID AND POLYMER SCIENCE
·
2025
·
IF 2.3
Li Yuan,Yalikun Nuerbiya,Wang Qiang,Yu Shenglong
The surface properties and thermodynamic properties of high-temperature coal tar pitch (HCTP) were determined by inverse gas chromatography at 323.15–353.15 K, and its surface dispersion free energy, Lewis acid–base constant, Florry-Huggins interaction parameters and Hildebrand solubility parameters of HCTP were determined. In the range of 323.15–353.15 K, the surface dispersion free energy of HCTP increased with the increase of temperature. Furthermore, the acid constant K a of HCTP calculated as 0.259, the base constant K b is 3.1, demonstrated that HCTP is an amphoteric alkaline material. The Florry-Huggins interaction parameters showed that tetrahydrofuran and butanol were good solvents for HCTP. The Hildebrand solubility parameters of HCTP at 323.15–353.15 K were 17.33, 16.76, 15.98, and 14.68 (J/cm 3 ) 0.5 , respectively, and showed a downward trend with the increase of temperature. Graphical abstract
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 5
·e70148
·
IF 0
Han Zhang,Sisi Wang,Jingshu Ban,Hao Li,Le Ruan,Fushun Tang
In this paper, the NO adsorption performances of Ni-AIP MOF and Ni-AIP-BPY MOF synthesized by solvothermal method were compared, and the NO adsorption selectivity of two samples for the simulated flue gas conditions has also been studied. The results indicated that the Ni-AIP-BPY exhibited better NO adsorption performance with an NO adsorption capacity of 115.52 cc·g −1 at 100 kPa and ambient temperature and showed better adsorption selectivity with the highest adsorption selectivities of 937 and 10,691 for NO/CO 2 and NO/O 2 , respectively. Adsorption enthalpy calculations showed that Ni-AIP-BPY had a strong interaction force on NO, XPS and in-situ NO-FTIR results also confirmed that a strong adsorption occurred on the Ni metal center, and the main adsorptive products after NO adsorption were nitrate and nitrite. The introduction of a second ligand into the saturated coordination amine-containing complexes can improve the pore structure and coordination state of the materials, so that the complexes can activate unsaturated metal sites, thus significantly improving their adsorption and separation performance for NO gas molecules in flue gas. The results provided a new idea and understanding for the synthesis of materials for selective separation of NO components in flue gas.
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SENSORS
·
2025
·Vol. 25
·期 3
·901
·
IF 3.5
Jian Wang,Caicai Sun,Jusheng Bao,Zhiwei Yang,Jian Zhang,Xiao Huang
Simple SummaryIn this work, Y-doped LTO nanosheets were synthesized for NO2gas sensing under different humidity conditions. These materials showed increased responses at higher humidity levels due to enhanced proton conduction and NO2-assisted proton generation. Notably, Y-doped LTO nanosheets exhibited higher responses than pure LTO, as Y-doping created more oxygen vacancies, improving water adsorption and proton dissociation.Water molecules from the environment or human breath are one of the main factors affecting the accuracy, efficiency, and long-term stability of electronic gas sensors. In this contribution, yttrium (Y)-doped La2Ti2O7(LTO) nanosheets were synthesized by a hydrothermal reaction, demonstrating improved proton conductivity compared to their non-doped counterparts. The response of Y-doped LTO with the optimal doping concentration to 100 ppm NO2at 43% relative humidity (RH) was −21%, which is four times higher than that of bare La2Ti2O7. As the humidity level increased to 75%, the response of Y-doped LTO further increased to −64%. Unlike the gas doping effect observed in previous studies of semiconducting metal oxides, the sensing mechanism of Y-doped LTO nanosheets is based on the enhanced dissociation of H2O in the presence of target NO2molecules, leading to the generation of more protons for ion conduction. This also resulted in a greater resistance drop and thus a larger sensing response at elevated humidity levels. Our work demonstrates that proton-conductive oxide materials are promising gas-sensing materials under humid conditions.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Leyao Bi,Boyan Fu,Jiahui Lin,Junsheng Wen,Jiaxing Fu,Binglin Zou,Ningning Su,Chunjie Wang,Yue Wang
Acetylacetone gas is a flammable, explosive, and toxic volatile compound with a pungent odor that can contaminate the atmospheric environment and pose a risk to human health. Consequently, establishing effective detection methods for acetylacetone is imperative. In this study, Co-doped ZnO (ZOC) were synthesized via a hydrothermal method with varying Co concentrations from 0 to 15 %, and used for the detection of acetylacetone for the first time. The sample with an 8 % Co/Zn mass ratio (8-ZOC) exhibits optimal gas sensing performance for acetylacetone. At a working temperature of 260 °C, the response to 100 ppm acetylacetone reaches up to 557.25, with a rapid response time of 6 s. Compared to pure ZnO, the response of 8-ZOC is increased by 5.9 times, and both the recovery time and the optimum operating temperature are reduced by 154 s and 40 °C, respectively. When exposed to UV light, the response value of 8-ZOC further improves to 682.49. Moreover, the underlying mechanisms of the enhanced gas sensing properties are also explored in detail. This research provides essential insights for the development of acetylacetone gas sensors.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Ziwei Zhang,Jiangwei Ma,Weixiao Hou,Haichao Zhai,Hui Yong,Jifan Hu,Kewei Zhang,Yu Zhang,Haiwen Wang,Jiachen Liu
Metal-organic frameworks (MOFs) are characterized by their porous structures, which provide an exceptionally large specific surface area and a precisely controlled composition. Amorphous MOFs ( a MOFs) integrate the diverse properties of MOFs with those of amorphous materials, such as hierarchical morphology and abundant deficiencies. Therefore, a MOFs serve as promising precursors for metal oxides with porous structures and rich vacancies. NH 2 -MIL-68 (In) is a novel indium-MOF material with promising features. In this research, the amorphous NH 2 -MIL-68 (In) ( a NH 2 -MIL-68 (In)) was chosen as the template. Indium oxide rough straight rods ( a -In 2 O 3 RSRs) with extensive oxygen vacancies were prepared, where a - indicates that the precursor is amorphous. As a result, the a -In 2 O 3 RSRs sensor demonstrated an outstanding gas sensing response towards 2 ppm chlorine (Cl 2 ) at a low temperature of 160℃. This study is the first to report that the a MOFs can be employed as gas sensing materials with superior Cl 2 detection capabilities, offering a promising method for real-time gas monitoring.
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