INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2015
·
IF 2.587
Z. B. Huang,B. S. Liu,X. H. Wang,X. Y. Tang,R. Amin
In order to improve the desulfurization efficiency of 50% MnxOy/MCM-48 sorbent, the preparation parameters including synthesis method (excessive impregnation, precipitation, and sol–gel), precursor selection (Mn(Ac)2 and Mn(NO3)2), heating rate during calcination (2°/min, 4°/min, 6°/min, and 8°/min), and calcination temperature (450 °C, 550 °C, 650 °C, and 750 °C) of sorbents were investigated systematically. The structure and composition of different sorbents were characterized by XRD, BET, TG/DSC, H2-TPR, UV–vis, TPSR, and FT-IR techniques. The results indicated that synthesis methods and precursors influenced remarkably the dispersion of active particles while the stable structure of MCM-48 and the dispersion of active particles correlated closely with the heating rate during calcination and calcination temperature of sorbents, which will influence the desulfurization efficiency of sorbents. Therefore, the better dispersion of active particles and integrity of MCM-48 structure will result in better desulfurization performance of sorbents. Thus, the best condition was the calcination temperature of 550 °C with a heating rate of 2°/min using Mn(Ac)2 as precursor by a sol–gel method.
研究领域:
环境化学
·
材料科学
·
化学工程
·
能源技术
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Zhilong Song,Jia Yan
The analysis of exhaled human breath has great significance for early noninvasive diagnosis. However, highly sensitive and selective detection against part-per-billion (ppb) biomarkers in exhaled human breath (RH ≥80%) at room temperature remains a challenge. SnO2 quantum wires (QWs) consisting of a few hundreds to thousands of atoms are demonstrated to be promising for low-power consumption gas sensors to achieve an on-chip electronic nose. Here, we propose a low-temperature doping strategy in realizing the synthesis of the transition metal (Mn, Cr, V)-doped SnO2 QWs. The doped SnO2 QWs with sub-4 nm diameters as chemiresistive gas sensors enable us to improve the adsorption activities, achieving enhanced room-temperature sensing properties toward the trace biomarkers (e.g., acetone, formaldehyde, and H2S) with the state-of-the-art limit of detection of 2.6, 1.5, and 1.3 ppb, respectively. These transition metal-doped SnO2 QWs are then integrated as a sensor array, enabling gas identification at different relative humidities by using machine learning algorithms. Moreover, systematical characterizations combined with density functional theory (DFT) calculations are conducted to figure out the effect of doping on SnO2 QW properties for the sensitive and selective ppb-level gas detection. The engineering of transition metal-doped SnO2 QWs helps us to extend the library for the design of low-power consumption gas sensors in more broad applications.
研究领域:
材料科学
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纳米技术
·
气体传感
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电子鼻
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生物医学诊断
·
机器学习应用
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2012
·
IF 1.693
Jiangfeng Yang,Qiang Zhao,Hong Xu,Libo Li,Jinxiang Dong,Jinping Li
We prepared several different surfaces and pore volumes on small pore zeolites by hydrothermal synthesis and ion exchange (Li+, Na+, and Ca2+) based on three basic gas diameter grade structures of zeolites: KFI (0.39 × 0.39 nm), CHA (0.38 × 0.38 nm), and LEV (0.36 × 0.48 nm), which were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and elemental analysis. The surface area and microporous volumes were calculated using the Dubinin–Radushkevitch (D-R) equation based on CO2 adsorption at 273 K. The CHA was synthesized with a lower Si/Al ratio, and the surfaces and microporous volumes were changed greatly by ion exchange. KFI had a higher Si/Al ratio, and the scope of the surface could be kept smaller. Focusing on the CO2, CH4, and N2 adsorption isotherms at high pressure (1 MPa), we found that the samples were exchanged by Li+ and Na+ with bigger surfaces and greater adsorption volumes. The orifice diameter was very important in the sieving of CO2 and N2 or CO2 and CH4, while Na-LEV had an excellent sieving effect because N2 and CH4 could not diffuse into its structure like CO2. From the viewpoint of the separate adsorption equilibria: Na-zeolites had the highest data adsorption equilibrium selectivity for CO2 and N2 or CO2 and CH4, followed by Li-zeolites, which only had a strong adsorption potential of CO2; K-zeolites with high SCO2/N2 and SCH4/N2, based on the strong adsorption of CO2 and CH4. We conclude that the adsorption potential order was K-zeolites > Na-zeolites > Li-zeolites, so the bigger ions had a stronger affinity.
研究领域:
材料科学
·
吸附与分离技术
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化学工程
·
多孔材料
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Jingyi Cao,Jun Pan,Zhaoliang Cui,Zhaohui Wang,Xiaozu Wang,Enrico Drioli
Membrane condenser (MC) is a novel and promising operation to recover evaporated water from highly humid gas discharged from industrial production. By means of hydrophobic membrane surface, water vapor condensed on membrane retention side, finally be collected. The aim of this paper is to enhance the recovery efficiency of poly(vinylidene fluoride) (PVDF) membrane in MC process. Significantly, coating three kinds of Hyflon ADs onto PVDF membranes effectively improved hydrophobicity of original ones. Among them, Hyflon AD40L/PVDF membrane showed the best membrane and MC performance, the LEP w and water contact angle of which reached 0.43 MPa and 126°, respectively. In terms of dehydration performance in MC, by coated with Hyflon AD40L, water recovery was increased from 7.92% to 18.85%, and condensate water flow (0.35 kg·m −2 ·h −1 ) was twice that of pristine ones (0.15 kg·m −2 ·h −1 ). These results indicate that Hyflon AD composite membrane is a promising candidate for MC process with high efficiency.
研究领域:
环境工程
·
膜科学
·
水资源回收
·
工业废气处理
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 7.7
Li Chen,Ya-Jie Wang,Xiao-Qian Kuang,Yu-Qing Zhang,Tian-Yu Yang,Min Li,Zheng Guo
Benzene, toluene, ethylbenzene, and m-xylene (BTEX) are typical volatile organic compounds (VOCs) that pose serious threats to human health. However, their inherent chemical stability and low reactivity render selective and sensitive detection particularly challenging. Herein, we report a p–n heterostructured gas sensing material comprising hollow Co 3 O 4 nanocubes embedded in porous ZnO nanotubes (Co 3 O 4 /ZnO NTs), fabricated via coaxial electrospinning and Metal-organic frameworks (MOFs)-derived pyrolysis. The engineered architecture combines the large surface area and porosity of ZnO nanotubes with the abundant active sites of Co 3 O 4 , facilitating efficient gas diffusion and charge transport. The resulting sensors exhibit markedly enhanced responses to BTEX gases, particularly ethylbenzene. At 50 ppm, the responses to benzene, toluene, ethylbenzene, and m-xylene are 2.3, 12.2, 46.5, and 30.9 times higher, respectively, than those of pristine ZnO nanotubes. In addition, the sensor demonstrates excellent selectivity for ethylbenzene and stable long-term operation. This work demonstrates an effective strategy for tuning oxide heterojunctions toward high-sensitivity, selective detection of aromatic VOCs, offering practical value for environmental monitoring.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2026
·
IF 6.1
Jiahao Li,Ren Liu,Chunshui Wang,Xiangfeng Chu,Shiming Liang
Developing a room temperature, real-time, and efficient sensor for trimethylamine (TMA) detection remains a challenge in food safety and disease screening. Ti 3 C 2 T x , a two-dimensional material with abundant surface functional groups, is expected to form sensing materials of low operating temperature when combined with metal oxides. In this work, a series of Ti 3 C 2 T x -CuGa 2 O 4 composites were prepared using the hydrothermal method. The gas-sensing experiment found that the response values of composites were improved towards TMA at room temperature (RT). Notably, the 9.1 wt% Ti 3 C 2 T x -CuGa 2 O 4 (MCU-10) composite exhibited a response value of 33.5 towards 100 ppm TMA-a 26.8-fold enhancement compared with CuGa 2 O 4 , with a response time of 4.3 s and a recovery time of 25.7 s. Meanwhile, the MCU-10 sensor showed outstanding gas-sensing selectivity, repeatability, and long-term stability in the sensing process. The reasons of enhanced gas-sensing properties are attributed to the incorporation of abundant surface functional groups and the higher content of oxygen vacancies. Besides, a potential explanation for the abnormal sensing behavior of CuGa 2 O 4 towards reducing gases is proposed. This work not only proposes a promising sensing material for TMA gas sensors but also highlights the potence of Ti 3 C 2 T x as a sensitizing agent in the field of gas-sensing materials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Xiao Xu,Qiang Yang,Chao-yang Wang,Xiao-ling Ge,Hua-lin Wang
Although compact separation by a hydrocyclone is popular in the chemical and petro-chemical industry, the separation of dissolved gas from continuous liquid in a hydrocyclone is rarely mentioned, and few investigations consider the gas solubility changes occurring with the cyclone flow. This work investigates dissolved carbon dioxide separation from water by an inner cone hydrocyclone. When the inlet mass flow is less than 1.2 m 3 /h, increasing the inlet mass flow could increase the separation efficiency. When the inlet mass flow is more than 1.2 m 3 /h, increasing the inlet mass flow will decrease the separation efficiency. An optimum inlet mass flow of 1.2 m 3 /h can provide the maximum separation efficiency of 40.2%. Turbulence simulations also assist in analyzing the flow pattern and the separation progress.
研究领域:
化学工程
·
石油工程
·
流体力学
·
分离技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2019
·Vol. 26
·期 10
·1-9
·
IF 1.53
Hou Lei,Wang Zhe,Xu Jingmei,Chen Zhaoyu
In this study, a series of poly(arylene ether ketone) containing amino and fluorenyl groups (Am-PAFEK-X) were successfully prepared by the polycondensation, which was confirmed by analizing its chemical structure with the Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance. It was found that Am-PAFEK-X exhibited high thermal stability (T d5 > 172 °C) and glass transition temperature (Tg > 191 °C) as well as good mechanical properties, and its highest Young’s modulus and tensile strength are respectively 2299 MPa and 59 MPa. In addition, the O 2 , N 2 , CO 2 and CH 4 were applied to study the gas transmission properties of Am-PAFEK-X membranes to different gases, in which the Am-PAFEK-60% had the highest selectivity to CO 2 /N 2 and CO 2 /CH 4 , respectively 31.13 and 33.36. As shown in the results, the selectivity of the membrane to CO 2 increased with the increase of the large rigid fluorenyl groups, which indicated that the gas permeation results were closely related to the intermolecular interaction and the structure of the polymer chain.
研究领域:
高分子科学
·
材料科学
·
气体分离技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Wanli Zhao,HongLi Suo,Shuo Wang,Lin Ma,Lei Wang,Qiuliang Wang,Zili Zhang
MgB 2 superconductor pellets were synthesized through Mg gas infiltration method using nanosized- and microsized B powders. There was a marked difference in the superconducting properties of the two samples, particularly in the pinning force and dominant pinning mechanism. The microstructures of the samples were observed using HR-TEM and STEM-HAADF, and the results showed that the primary reason for the difference in the superconducting properties is the distribution of the nanosized second-phase particle MgO. Additionally, a feasible reaction model for the Mg gas infiltration method was established. Compared to the Mg liquid infiltration method, the gas infiltration showed better penetrability ability with a small amount of residual Mg. This study presents a novel synthesis process to fabricate an MgB 2 pellet with superior density and superconducting properties. This method can be used in multiple applications such as superconducting bearings, compact superconductor magnets, and magnetic shielding.
研究领域:
超导物理
·
材料科学
·
陶瓷工艺
·
应用物理学
✓ 已验证
DOI
高影响因子
ACS Catalysis
·
2017
·
IF 10.614
Ming Xu,Shan He,Hao Chen,Guoqing Cui,Lirong Zheng,Bin Wang,Min Wei
The modulation of strong metal–support interaction (SMSI) plays a key role and remains a challenge in achieving the desired catalytic performance in many important chemical reactions. Herein, we report a TiO2–x-modified Ni nanocatalyst with tunable Ni–TiO2–x interaction via a two-step procedure: preparation of Ni/Ti mixed metal oxide (NiTi–MMO) from NiTi-layered double hydroxide (NiTi–LDH) precursor, followed by a further reduction treatment at different temperatures. A combination study (XRD, TEM, H2-TPR, XPS, and in situ EXAFS) verifies that a high reduction temperature enhances the Ni–TiO2–x interaction, which results in an increased coverage degree of Ni nanoparticles by TiO2–x as well as electron density of interfacial Ni (Niδ−). Moreover, the creation of a Niδ−–Ov–Ti3+ interface site (Ov denotes oxygen vacancy) induced by strong Ni–TiO2–x interaction serves as dual-active site to efficiently catalyze the water–gas shift reaction (WGSR). The optimized catalyst (Ni@TiO2–x(450)) via tuning Ni–TiO2–x interaction gives a TOF value of 3.8 s–1, which is ∼7 times larger than the conventional 15%Ni/TiO2(450) catalyst. Such a high catalytic efficiency is attributed to the interfacial site (Niδ−–Ov–Ti3+) with medium strength of metal–support interaction, as revealed by in situ diffuse reflectance Fourier transform infrared spectroscopy (in situ DRIFTS), which promotes the synergic catalysis between Niδ− and oxygen vacancy toward WGSR.
研究领域:
催化化学
·
材料科学
·
表面科学
·
能源化学
·
纳米催化
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122285
·
IF 7.5
Faruk Omar,Dian Ding,Zhuo Chen,Zhihua Zhao
Selective room-temperature detection of 1-octen-3-ol, a representative fungal volatile organic compound (VOC) associated with food spoilage, remains challenging due to limited adsorption–activation efficiency in conventional sensing materials. Herein, pristine Zeolitic imidazolate framework (ZIF-67) and Rhodium (Rh)-decorated ZIF-67 (Rh@ZIF-67) were developed as chemiresistive sensing materials via a mild solution-based strategy, achieving controlled Rh loadings (0.4–0.6%) while preserving the polyhedral ZIF-67 framework. The crystal structure, surface chemical states, porosity, and morphology were systematically characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Brunauer–Emmett–Teller (BET) surface area analysis, scanning electron microscopy (SEM), and transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy (TEM/EDS), confirming that the ZIF-67 framework was preserved and Rh species were successfully anchored on the porous host. At room temperature (25°C), the optimized 0.5%Rh@ZIF-67 sensor exhibits a stable concentration-dependent response over 5–50 ppm, delivering a response of 2.41 at 50 ppm—approximately 15.1 times higher than pristine ZIF-67 (0.16) with response and recovery times of 90 s and 119 s, respectively. The sensor further demonstrates good selectivity, repeatability, and long-term stability over 25 days. Humidity evaluation (30–90%) Relative Humidity (RH) indicates moderate response attenuation attributed to competitive adsorption of water molecules. The enhanced sensing performance is attributed to synergistic adsorption enrichment from porous ZIF-67 combined with Rh-induced catalytic and electronic sensitization, enabling efficient resistance modulation under ambient conditions. This work provides a promising strategy for low-power, selective monitoring of spoilage-related VOC biomarkers in practical storage environments.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL CHEMISTRY
·
2026
·
IF 1.5
Qi Haolong,Liu Haixin,Shen Xin,Zhang Yuanyuan,Xu Xiang,Yang Kexin,Wei Linyi,He Yongrui,Sun Tao,Cai Zhiqiang
Pillar[ n ]arenes ( n = 5–10), novel macrocycles, are gaining prominence in supramolecular studies owing to their distinctive three-dimensional architecture featuring a π-electron-rich cavity and have emerged as a key synthetic macrocyclic host in research. Extended pillar[ n ]arenes ( Ep[ n ]As ) notably feature sizable internal voids, adaptable structures, versatile cavity shapes, and ease of synthesis. This work presents the first example of imidazolium ionic liquid-functionalized Ep[ n ]As (BpP6A-C10-IM-C8[NTf 2 ]) as a gas chromatography stationary phase. The BpP6A-C10-IM-C8[NTf 2 ] column was prepared by the static method, exhibiting medium polarity and high column efficiency (4660 plates/m, k = 2.29). The separation performance of the prepared column was evaluated for analytes, including a mixture of 22 analytes, more than 12 positional isomers, and 8 cis- / trans- isomers. Furthermore, the chromatograms of the challenging isomers of bromonitrobenzenes, chloronitrobenzenes, bromobenzaldehydes, toluidines, and dimethylanilines on the BpP6A-C10-IM-C8[NTf 2 ] column were compared with those on the BpP6A-C10 column and commercial HP-5 and HP-35 columns. The BpP6A-C10-IM-C8[NTf 2 ] column also showed high selectivity for biphenyl isomers, including methylbiphenyls, iodobiphenyls, and bromobiphenyls.
✓ 已验证
DOI
高影响因子
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