Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 45
·23999-24010
·
IF 8.867
Xiao Wang,Ruya Cao,Shouwei Zhang,Peiyu Hou,Ruxia Han,Minghui Shao,Xijin Xu
The development of advanced functional materials for catalytic reduction and gas sensing is one of the most important issues for the detection and prevention of environmental pollution. Herein, hierarchical peony-like metal/metal oxide (Co/Al2O3 and Co3O4/Al2O3) composites assembled with uniform nanosheets were successfully synthesized using CoAl layered double hydroxides as self-sacrificial templates. Co/Al2O3 composites exhibited high surface dispersions and low metal–support interactions which can be confirmed by a series of structure and morphology characterizations. With the above advantages, Co/Al2O3 composites showed remarkable catalytic ability and stability towards 4-nitrophenol (4-NP) reduction with a nearly 100% conversion within 3 minutes and a conversion efficiency over 98% after 10 successive recycles. After that, Co/Al2O3 composites with different Co/Al ratios were fabricated to investigate the optimal Co content in the catalytic reduction of 4-NP. The results indicated that when the Co/Al ratio reaches 4 : 1, the fabricated composites have the best catalytic reduction abilities. Furthermore, the fabricated Co3O4/Al2O3 gas sensors exhibited a superior response time of 1 s towards 50 ppm ethanol with a sensing response of 8.9. These excellent catalytic reduction and gas sensing abilities could be attributed to the unique peony-like hierarchical structure which could provide large surface areas and abundant active sites. More importantly, this work provided a new synthesis strategy to design materials with enhanced catalytic reduction and gas sensing abilities, which will be beneficial to the development of highly effective catalysts and gas sensing materials.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Xu Zhang,Haibiao Xu,Qin Meng,Zheng Fan,Wenhai Zhang,Chong Shen,Guoliang Zhang
In this study, novel Pebax-derived ultra-microporous carbon molecular sieve composite membrane assisted by polydopamine (PDA) interlayer was synthesized by dip-coating and pyrolysis method. Pebax was first explored as the precursor and PDA was selected as flexible coating layer on the polymeric substrate in preparation of CMS composite membranes. Pebax had long linear chain polyamine structure and contained large number of carbonyl groups and hydrogen bonds that were pyrolyzed under relatively low temperature. Compared with incorporating inorganic interlayer, the PDA organic interlayer constructed under mild condition had excellent adhesion towards the polymeric support. Since the intrusion of precursor Pebax into the pore of substrate was prevented, the channels of passage were shortened and the transport of gas molecules was greatly promoted. Through designable chemical bonding resistant to harsh conditions, the adhesion between organic interlayer and CMS layer were kept strong due to natural compatibility of materials, leading to the formation of defect-free CMS membranes with enhanced stability in operation. The fabricated CMS membrane displayed excellent H 2 /CO 2 selectivity of 40.69 and very competitive permeability of 1.23 × 10 −7 mol m −2 Pa −1 s −1 .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Zhanjian Liu,Huaiyuan Wang,Xiguang Zhang,Chijia Wang,Chongjiang Lv,Yanji Zhu
In this work, a novel bistratal gas layer structure has been used to enhance the long-term durability of a superhydrophobic surface. The design of this bistratal structure takes inspiration from the wings of the insect Notonecta glauca and a spider web. It is comprised of an underlying semi-interpenetrating array structure and a superficial microfiber network structure. On modification with 1 H ,1 H ,2 H ,2 H -perfluorooctyltriethoxysilane (POTS), the prepared surface demonstrates an excellent superhydrophobicity with a water contact angle (WCA) of 168 ± 1.4° and a sliding angle (SA) of 4 ± 0.5°. The underlying semi-interpenetrating array structure can capture more gas to form a stable underlying gas layer, which enhances its anti-static pressure capability. When the superhydrophobic surface was impacted by a high-pressure water column (250 kPa), the superficial micro fibers network structure acted as a buffer layer to disperse the impact force that spread over the network. The prepared surface with bistratal gas layer structure was thus able to high speed water jetting (22.4 m s −1 ), which is three times the speed of the heavy rain (7–9 m s −1 ) and four times that reported for polysiloxane/multiwalled carbon nanotubes (POS/MWCNTs) surfaces (5.4 m s −1 ). Furthermore, the superhydrophobic surface designed by this method was also shown to possess self-healing and hot-water-repellent (100 °C) capability. These features demonstrate the practical potential of superhydrophobic surfaces with a bistratal gas layer structure.
研究领域:
材料科学
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表面工程
·
纳米技术
·
仿生学
·
物理化学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 10
·e55068
·
IF 3
Zhu Mian,Wang Bin,Lv Chao,Yu Zhenhui,Jingxian Liu
Gas separation membranes offer a cost-effective solution for capturing greenhouse gases, mitigating the global greenhouse effect. Ionic liquids (ILs) have emerged as one of the promising materials for greenhouse gas separation due to their strong affinity for CO 2 . In this study, we propose a laboratory-scale method for preparing IL–PVDF blend membranes with high CO 2 /N 2 selectivity. The separation performance of the membranes was evaluated using a custom gas permeation measurement system. The effects of casting solution composition, solidification method, and film-forming processes on separation performance were experimental investigated, and the obtained experimental data were used to train a back propagation neural network (BPNN) optimized by the Gray Wolf Optimizer (GWO) algorithm. This hybrid GWO–BPNN model was utilized to predict separation membrane efficiency, optimize the film-forming process, and identify the optimal range of process parameters. Notably, the GWO–BPNN model demonstrated a 2.76% higher prediction accuracy compared to a standalone BPNN. The results indicated that the GWO–BPNN algorithm has a great potential to accurately predict membrane separation efficiency and apply in optimal membrane process design (OMPD), and this method can significantly reduce the number of experimental trials required to achieve OMPD.
研究领域:
材料科学
·
化学工程
·
环境科学
·
膜分离技术
·
计算材料学
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高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 35
·18019-18026
·
IF 7.443
J. J. Qi,S. Gao,K. Chen,J. Yang,H. W. Zhao,L. Guo,S. H. Yang
A three-dimensional (3D) hierarchical structure consisting of vertically aligned, double-sided, and self-supported WO3 nanocolumn bundles has been successfully synthesized via an acid-assisted (HCl) hydrothermal process without any templates, catalysts, or substrates. A possible formation mechanism is proposed, which involves dissolution–recrystallization and Ostwald ripening processes in concert with the structure-directing role of HCl, leading to the morphology grown along [200] with largely exposed (002) facets. The hierarchical monoclinic structure of the WO3-based sensor contains abundant active sites and loose structures which afford beneficial conditions for gas adsorption and diffusion, and the as-synthesized sensor proves to be an excellent NO2-sensing material with high sensitivity, good selectivity, rapid response (ca. 23 s)/recovery (ca. 11 s), and remarkable repeatability at a low operating temperature (∼110 °C). A possible gas-sensing mechanism will be discussed based on largely exposed (002) facets, the O-terminated (001) surface of which containing unsaturated coordinated O atoms is more active to adsorb NO2 molecules easily and efficiently. The superior gas sensor properties offer a potential platform for monitoring harmful and toxic gases, especially those flammable and explosive volatile organic compounds (VOCs).
研究领域:
材料科学
·
纳米技术
·
气体传感
·
化学传感器
·
无机合成
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xiangxin Nie,Zongming Zheng,Qiang Lu,Changqing Dong,Wu Qin,Tipeng Wang
The slurry discharge water from the flue gas desulfurization process in coal-fired power plant is rich in high salinity and chloride. The hardness may easily lead to scaling during the wastewater treatment. The internal airlift loop reactor based NaOH and CO 2 two-step approach is employed to investigate the softening of flue gas desulfurization wastewater treatment. NaOH is used to precipitate the dissolved magnesium in the first step. CO 2 is used to precipitate the dissolved calcium in the second step. The magnesium removal rate of 99% is obtained at the molar concentration ratio of NaOH and magnesium of 2.2 and aeration rate of 1 L min –1 . The optimized calcium removal condition is CO 2 concentration of 15% by volume, temperature of 30°C, initial pH of 12.8 and aeration gas rate of 7 L min –1 . The residual magnesium and calcium of 4.6 and 43.8 mg L –1 were detected in softening experiment with the coal-fired power plant flue gas desulfurization wastewater. The resultant CaCO 3 is the crystal calcite, which is a pure and regular flaky block and can be used as desulfurizer for wet flue gas desulfurization. This work provides the potential pretreatment solution for large scale flue gas desulfurization wastewater treatment.
研究领域:
环境工程
·
废水处理
·
化学工程
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 13.2
Lizhen Lian,Min Zhang,Liqiang Wang,You-Nian Liu
Gas–liquid–solid catalytic hydrogenation over carbon-supported catalysts is typically performed at elevated temperatures and high hydrogen pressures, primarily because hydrogen is poorly soluble in the liquid phase. Enhancing the H 2 affinity of catalysts, thereby increasing the surface coverage of active hydrogen species, is an effective strategy; however, it remains challenging. Herein, we demonstrate that the H 2 affinity of carbon-supported catalysts can be optimized by introducing metal oxides into the carbon support, thereby increasing the surface hydrogen coverage on carbon-supported catalysts and ultimately enhancing their hydrogenation performance. As a proof of concept, cobalt supported on a homogeneous composite of d-Al 2 O 3 and N-doped carbon (Co/Al 2 O 3 –NC) has been prepared. The d-Al 2 O 3 component, possessing high H 2 affinity, promotes local H 2 concentration and stabilizes the dissociated hydrogen through the formation of O–H δ+ and Al–H δ- . Consequently, Co/Al 2 O 3 –NC exhibits significantly enhanced hydrogenation performance (TOF = 343 h −1 ) across hydrogenation of p -chloronitrobenzene compared to those of Co/NC (TOF = 32 h −1 ) and Co/Al 2 O 3 (TOF = 53 h −1 ) catalysts under 100 °C and 5 bar H 2 . These findings provide new insights for designing efficient catalysts for gas–liquid–solid catalytic hydrogenation reactions over carbon-supported catalysts.
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Huanming Wang,Jinqiao Hou,Chong Li,Xinge Cui,Chenze Lu,Fujian Ren,Chen Fu,Jingting Luo,Ran Tao
Non-invasive monitoring of exhaled isopropanol (IPA) is a promising route for diabetes management. However, current analytical methods are limited by inadequate sensitivity, low selectivity, and slow response times. In this work, we report a high-performance surface acoustic wave (SAW) gas sensor engineered with Pt-doped ZnO nanoparticle films synthesized via hydrothermal growth and spin-coating. The sensitive layer is optimized with 0.5 wt% Pt doping level, which enhances the specific surface area and pore structure uniformity. At room temperature (25°C), the sensor demonstrates exceptional performance, featuring highly selective IPA detection with a sensitivity of 6.76 Hz/ppm, fast response/recovery times of 12 s/12 s, a low detection limit of 1.38 ppm, and excellent reproducibility over 30 days of operation. Mechanistic studies confirm that the high selectivity is governed by a Pt-O coordination effect that facilitates preferential IPA adsorption. This work presents a robust and practical platform for diabetes monitoring and provides a clear strategy for the rational design of next-generation metal oxide-based gas sensors.
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高影响因子
Materials
·
2020
·Vol. 13
·期 24
·
IF 3.057
Nuerguli Kari,Marco Zannotti,Gulgina Mamtmin,Rita Giovannetti,Babak Minofar,David Řeha,Patigu Maimaiti,Buayishamu Kutilike,Abliz Yimit
Substituent effect on optical gas sensing performance in porphyrin-based optical waveguide detection system was studied by molecular dynamics simulation (MDS), absorption/emission spectrum analysis, and optical waveguide (OWG) detection. The affinities of porphyrin with seven types of substituents (–H, –OH, –tBu, –COOH, –NH2, –OCH3, –SO3−) on para position of meso-phenyl porphyrin toward gas molecules in adsorption process were studied in different size of boxes with the same pressure and concentration. Analyte gases (CO2, H2S, HCl, NO2) were exposed to porphyrin film in absorption spectrophotometer, and in OWG with evanescent field excited by a guiding laser light with 670 nm wavelength. The extent of interaction between host molecule and the guest analytes was analyzed by the number of gas molecules in vicinity of 0.3 nm around substituents of porphyrin molecules. Optical waveguide results reveal that sulfonate porphyrin is mostly responsive to hydrochloride, hydrosulfide gas and nitrogen dioxide gases with strong response intensity. Molecular dynamics and spectral analysis provide objective information about the molecular state and sensing properties. Molecular rearrangements induced by gas exposure was studied by spectral analysis and surface morphology before and after gas exposure taking hydrosulfide gas as an example. Film-gas interaction mechanism was discussed in terms of each gas and substituent group characters.
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高影响因子
SENSORS
·
2017
·Vol. 17
·期 6
·1203
·
IF 2.677
Hongxiang Chen,Wei Jiang,Lianfeng Zhu,Youwei Yao
Amorphous indium gallium zinc oxide (a-IGZO) powder was prepared by typical solution-based process and post-annealing process. The sample was used as sensor for detecting C2H5OH, H2, and CO. Gas-sensing performance was found to be highly sensitive to C2H5OH gas in a wide range of concentration (0.5–1250 ppm) with the response of 2.0 towards 0.5 ppm and 89.2 towards 1250 ppm. Obvious difference of response towards C2H5OH, H2, and CO was found that the response e.g., was 33.20, 6.64, and 2.84 respectively at the concentration of 200 ppm. The response time and recovery time of was 32 s and 14 s respectively towards 200 ppm concentration of C2H5OH gas under heating voltage of 6.5 V.
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高影响因子
ChemSusChem
·
2026
·Vol. 19
·期 6
·e202502726
·
IF 5.9
Lihui Huang,Siyu Zou,MengLi Zeng,Yaolan Li,Zhiping Liu,Jun Zhang,Xinjian Feng
The enzymatic synthesis of pyruvic acid (PyA) from biomass-derived lactic acid (LA) using oxidases under mild conditions represents a promising sustainable route. However, its efficiency is hindered by insufficient O 2 mass transfer and undesired PyA degradation resulting from the enzymatic byproduct H 2 O 2 . Herein, we present an gas-liquid-solid triphase bioelectrochemical reaction system that can address these two challenges symmetrically. This design ensures an efficient supply of O 2 from the air phase to the lactate oxidase (LOx) active zone, thereby overcoming the mass-transfer constraint of oxygen. Simultaneously, the in situ electro-oxidation of H 2 O 2 minimizes the degradation of PyA. Consequently, the reaction system achieves a production rate of 54.34 µM h −1 U −1 , which is 63-fold greater than that of conventional liquid-solid diphase enzymatic systems. Mathematical modeling and electrochemical studies revealed that enhanced local O 2 levels and efficient H 2 O 2 removal are the keys to superior performance. This work provides a sustainable and efficient route for PyA biosynthesis while demonstrating the potential of engineered bioelectrocatalytic environments for green synthesis. Graphical A triphase (air–liquid–solid) bioelectrochemical cascade reaction system is utilized for enzyme-catalyzed pyruvate production. This approach effectively overcomes the challenges of hypoxic conditions and pyruvate oxidation in the presence of H 2 O 2 . Compared to the conventional diphase enzymatic system, the formation rate in this triphase bioelectrochemical cascade system is enhanced by a factor of 63.
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产品关联
DOI
PubMed
高影响因子
Processes
·
2026
·Vol. 14
·期 13
·2072
·
IF 3.4
Tao Wei,Shibing Cai,Liangning Huang,Jianwei Song,Tu Hu,Huanwu Zhan
Methane (CH4) was employed as a carbon source for the reduction and carburization of TiO2via a gas-phase infiltration process to synthesize titanium carbide (TiC). The highly reactive and diffusible carbon species derived from CH4decomposition enable a significant reduction in both reaction time and temperature compared with conventional carbothermal reduction methods. The phase evolution during the CH4-driven reduction–carburization of TiO2was analyzed, and the effects of CH4volume fraction, reaction temperature, and reaction time on the carburization efficiency were systematically investigated, with the phase composition and microstructure of the products also characterized. The optimal conditions in a CH4-Ar system were found to be 10%CH4–90%Ar at 1270 °C for 8 h, yielding a carburization efficiency of 79.1% for TiO2pellets. Increasing the CH4proportion led to more severe carbon deposition, with deposited carbon adhering to the pellet surface and clogging the internal pores. Raising the temperature promoted the reduction–carburization reaction, but excessive acceleration of CH4cracking above 1270 °C caused carbon accumulation on the TiO2surface, forming a carbon shell that lowered the carburization efficiency. Prolonging the reaction time was beneficial for achieving a higher degree of carburization.
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高影响因子
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