CHEMOSPHERE
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2018
·
IF 4.427
Songjian Zhao,Dongyao chen,Haomiao Xu,Jian mei,Zan Qu,Ping Liu,Yong Cui,Naiqiang Yan
The zirconium metal-organic framework material UiO-66 was doped with Ag nanoparticles and investigated for the removal of elemental mercury (Hg 0 ) in flue gas . Physical and chemical characterization of the adsorbents showed that adding Ag did not change the crystal structure and morphology of the UiO-66. Ag doping can improve the redox activity of UiO-66, and the adsorbent exhibited high thermal stability and surface area. Hg 0 removal experiments indicated that UiO-66 exhibited the higher performance compared with P25 and activated carbon, and the addition of Ag exhibited a significant synergistic effect with the UiO-66, which had highest Hg 0 adsorption capacity (3.7 mg/g) at 50 °C. Furthermore, the Hg 0 removal mechanism was investigated, revealing that Hg 0 is removed by the formation of an Ag amalgam and channel adsorption at low temperature, and through Ag-activated oxygen oxidation and channel capture at high temperature.
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DOI
高影响因子
LANGMUIR
·
2014
·
IF 4.384
Xiaohui Meng,Dong Qiu
Centimeter-sized two-dimensional (2D) colloidal single crystals of polystyrene (PS) particles were fabricated at the water/air interface by capillary-modulated self-assembly. Different from previous reports, in this work, emulsifier was used to facilitate the stress release during 2D colloidal crystal formation by adjusting the interparticle lateral interactions. With the assistance of compressed nitrogen flow, 2D hexagonal colloidal single crystals of centimeter size were obtained under appropriate emulsifier concentrations. A new method was also developed to transfer the 2D colloidal crystals from the air/water interface to the desired substrate without obvious disturbance. This new transferring method was proven not to be sensitive to surface wettability nor curvature, thus 2D colloidal single crystals with large areas could be obtained on different kinds of substrate.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Hongbing Wang,Yifei Yang,Linsen Zhou,Jun Chen,Linan Lin,Xinchun Mao,Wei Cui,Yunxi Yao
The reactive interfacial sites upon supported catalysts provide an alternative pathway to enable the reactants activation in an energetically favorable mode, thus decreasing the energy barrier and promoting the catalytic efficiency. By virtue of structural characterization, in-situ spectroscopic analysis, kinetic assessments and density functional theory (DFT) calculations, supported Pt/TiN catalysts are systematically studied to interrogate H 2 O activation on the Pt-TiN interfacial sites and its catalytic function during the low-temperature water gas shift (WGS). It is found that the partially oxygen-covered TiN surface is highly efficient for H 2 O activation by oxygen-assisted dissociation with an energy barrier of 0.41 eV, much less than that on metallic Pt surface. The formed hydroxyls binding on Ti sites, observed by in-situ X-ray photoelectron spectroscopy (XPS) and temperature programmed desorption (TPD), could readily react with the adjacent CO adsorbed on Pt clusters with the reaction energy barrier of 0.43 eV to attain the individual catalytic cycle. Benefiting from the enhanced H 2 O activation, the catalytic turnover rate of CO-H 2 O reaction on Pt/TiN is 3.8 and 20.3 times higher than that on traditional Pt/TiO 2 and Pt/SiO 2 at 403 K, respectively. The interfacial reactive sites are the origin of low-temperature WGS on Pt/TiN catalysts.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Xingxing Fu,Piaoyun Yang,Xufeng Xiao,Di Zhou,Rui Huang,Xianghui Zhang,Fan Cao,Juan Xiong,Yongming Hu,Yafang Tu,Yanan Zou,Zhao Wang,Haoshuang Gu
Formaldehyde is one of the most serious threats to human health owing to the wide-spread of indoor decoration of modern buildings in recent years. The online monitoring of formaldehyde concentration of the indoor environment has become an urgent issue in modern society. In this work, an ultrafast and highly selective room-temperature formaldehyde gas sensor based on the semiconductor nanomaterials was developed. The Pt-decorated MoO 3 nanobelts were employed as the formaldehyde sensing materials, which were synthesized through hydrothermal and chemical reduction process. The results show that the Pt nanoparticles loading on the surface of the nanobelts are metallic and well crystalized. After the surface-decoration by Pt nanoparticles , the room-temperature HCHO sensing performance of the MoO 3 nanobelts could be greatly enhanced. With only 0.61% (atomic ratio) of Pt nanoparticles loading on MoO 3 , the sensor response towards 200 ppm of HCHO could be increased from 5.7% to 39.3%. The average response and recovery rate were also improved, leading to ultrafast response and recovery process at room temperature. At the LOD (limit of detection) of 1 ppm, the response and recover time of the sensor was only 8.8 s and 0.94 s, respectively. Furthermore, the Pt-decorated MoO 3 nanobelts also exhibited outstanding selectivity against other typical interference VOC including methylbenzene, methanol, ethanol and acetone, as well as good anti-interference performance towards water vapors . The great improvement of the sensor performance could be attributed to the spill-over and catalytic effect of Pt nanoparticles toward HCHO at room temperature.
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高影响因子
POLYMER
·
2021
·
IF 4.43
Yuxuan Feng,Jizhong Ren,Hui Li,Dan Zhao,Lujie Sheng,Yongdong Wu,Wenyuan Zhao,Maicun Deng
Block polymers with thermal annealing are attractive routes to produce 6FDA-based polyimide membranes with enhanced gas separation performance. However, some 6FDA-based polyimide membranes exhibit different gas separation behavior trends under the thermal annealing process. In this work, two 6FDA-DETDA/DMMDA block polyimide membranes with different 6FDA-DETDA block lengths were prepared and annealed at three temperatures (150 °C, 250 °C and 350 °C). To investigate the thermal annealing process and its influence on the thermal cross-linking behavior and aggregation structures, in situ XRD and ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) were employed. Based on the orbital-weighted Fukui function calculated by Time-dependent density functional theory (TD-DFT) and AP-XPS spectra, it's found that free radicals cross-linking that induced by 350 °C annealing occurred in imide rings, and resulted in the destroyed imide rings and decreased average interchain distances in both block polyimides. However, the massive 6FDA-DETDA block hindered imide rings from destruction and resulted in a slight molecular filtration, which benefited the gas transport of small kinetic diameter gases. As a result, 350 °C annealed membrane of bPI-2 exhibited enhanced gas separation performance. We expect that this work will shed light on the effect of thermal annealing on the gas separation behavior of block polyimides and offer a way to tune gas separation performance by thermal annealing.
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高影响因子
Research
·
2023
·
IF 11
Feng Niu,Fugong Zhou,Zhixun Wang,Lei Wei,Jie Hu,Lei Dong,Yifei Ma,Mei Wang,Suotang Jia,Xuyuan Chen,Zhaomin Tong
Traditional metal oxide semiconductor (MOS) gas sensors have limited applications in wearable devices owing to their inflexibility and high-power consumption by substantial heat loss. To overcome these limitations, we prepared doped Si/SiO2 flexible fibers by a thermal drawing method as substrates to fabricate MOS gas sensors. A methane (CH4) gas sensor was demonstrated by subsequently in situ synthesizing Co-doped ZnO nanorods on the fiber surface. The doped Si core acted as the heating source through Joule heating, which conducted heat to the sensing material with reduced heat loss; the SiO2 cladding was an insulating substrate. The gas sensor was integrated into a miner cloth as a wearable device, and the concentration change of CH4 was monitored in real time through different colored light-emitting diodes. Our study demonstrated the feasibility of using doped Si/SiO2 fibers as the substrates to fabricate wearable MOS gas sensors, where the sensors have substantial advantages over tradition sensors in flexibility, heat utilization, etc.
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Zhuang Liu,Dachao Ma,Liwu Liang,Xuan Hu,Mengxue Ling,Zhou Zhou,Lizhong Fu,Zheng Liu,Qingge Feng
Hydrothermal treatment (HTT) of polyvinyl chloride (PVC) can efficiently remove chlorine (Cl) to produce low Cl hydrochar for solid fuel. This work performed co-hydrothermal treatment of PVC recycled plastics (PVC R ) with biomass, then tried to reveal the combustion behavior and Cl migration behavior during combustion of PVC-derived hydrochar . It is shown that the hydrothermal temperature was the dominant factor affecting the degradation and dechlorination of PVC R . Treated at 220 ℃ for 60 min, the dechlorination efficiency of PVC R was 4.88 wt% and it was significantly increased to 34.09 wt%, 28.60 wt% and 32.50 wt% when PVC R was co-treated with bagasse, bagasse + high impact polystyrene (HIPS) and bagasse + acrylonitrile butadiene styrene (ABS), respectively. The substitution of Cl by hydroxyl (-OH) and elimination were two main dechlorination pathways. Bagasse could provide abundant -OH so as to promote the dechlorination of PVC R . Interestingly, in the combustion of PVC R and hydrochars, the Cl was mainly released in the form of HCl at lower temperature combustion stage but C-Cl mostly emitted at higher temperature combustion stage . The emitted Cl species strongly depends on the Cl content in hydrochar and combustion temperature , but did not show relevance to the existence form of Cl in hydrochar. Hydrothermal dechlorination could sharply reduce HCl emission.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Luyu Wang,Zhaoxi Wang,Qun Xiang,Yang Chen,Zhiming Duan,Jiaqiang Xu
In order to construct highly sensitive and stable QCM gas sensor, we present an innovative strategy. Firstly, we employ a physical vapor deposition (PVD) method to coat a thin layer of copper on the surface of QCM silver electrode. Then, a novel metal complex as sensing material, [Cu(DDS) 2 (Cl) 2 (MeOH) 2 ], is grown in-situ on the copper layer to ensure a strong coupling between metal complex sensing materials and QCM electrode. The sensing material is characterized through following instruments: elemental analysis, single crystal XRD, SEM, PXRD, IR spectra and TGA. The sensing test results indicate that the QCM sensor exhibit high sensitivity and selectivity toward gaseous formaldehyde because of a reversible interaction between amino group and HCHO molecule. The detection limit reaches down to 50 ppb. This implies the facile-fabricated sensor has a great potential in the area of rapid, stable, sensitive, and selective formaldehyde on-site detection. Based on the temperature-varying micro-gravimetric experiment, enthalpy change is quantitatively obtained, which indicates that the interaction between the complex and HCHO molecules belongs to chemical adsorption. The values of ΔH calculated by Gaussian 09 indicate that chemical adsorption between NH 2 group and aldehyde group play a leading role in detecting selectively formaldehyde gas.
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高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 15
·155503
·
IF 3.874
Wangyang Yang,Honglie Shen,Jiawei Ge,Binbin Xu
Various gas sensors have made considerable improvements to the quality of people's lives. However, in most cases, changing of materials is necessary to adapt to the changing of the target gas, which limits the further application of gas sensors. To meet this challenge, in this work, molecular imprinting (MI) technology is introduced. Acrylic acid is used as a functional monomer, while gas molecules, including acetone, are used as templates. The MI process with an acetone template helps improve the acetone selectivity of TiO2 by up to 1.74–2.80 times. Moreover, it proved that other templates can increase the corresponding selectivity by at least 1.5 times by using the same matrix material. These results demonstrate the potential importance of the MI process in constructing a highly compatible gas sensor industry. Beyond this, the MI process has proved to achieve an ultrahigh specific surface area of 384.36 m2 · g−1. The optimal acetone sensor exhibits desirable comprehensive performance compared with other reports. An excellent TiO2 based prototype acetone sensor working at 300 °C with a low detection limit of 18 ppb is obtained.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hao Chen,Chaofang Li,Jing Yuan,Ding Bao,Fenghua Shen,Pingshan Wang,Xingzheng Dai,Zhanqing Lu,Kaisong Xiang,Hui Liu
The application of Fe-based ionic liquids (ILs) in elemental mercury (Hg 0 ) removal from flue gas is limited by the low oxidative activity of the Fe(III) center. Here, a strategy of engineering halogen ligand to enhance the oxidative activity of Fe-based ILs for mercury removal was proposed. We developed a series of ionic liquids [Bmim][FeCl 4-x Br x ] (x = 0–4) with varying ratios of Cl − and Br − ligand substitutions. Mercury removal performance evaluations demonstrated a positive correlation between the oxidative activity towards Hg 0 and the number of Br ligand substitutions in the ILs. [Bmim][FeBr 4 ] achieved ∼99 % removal efficiency in the temperature range of 50–150 °C, with a saturated adsorption capacity reaching 205.4 mg/g (at 150 °C). In-situ Raman spectroscopy, DFT calculations, Hg-TPD, and XPS collectively revealed that the introduction of Br significantly lowered the excitation energy of the ligand–metal p-d orbital electron transitions, which facilitates the generation of active bromine species with unfilled 4p orbital, consequently enhancing the oxidative removal performance of Fe-based ILs for Hg 0 . This work provides an application of metal-based ILs in the realm of mercury removal and broadens the scope of ligand–metal interaction for IL design.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Lingchu Huang,Weijia Li,Huaiyuan Sun,Jianyu Zhang,Bin Wang,Qi Lu,Tong Wang,Xishuang Liang,Fangmeng Liu,Peng Sun,Fengmin Liu,Geyu Lu
Expanding the application field of fuel cell type gas sensors is of great significance for achieving high sensitivity, real-time gas detection at room temperature. Here, we developed a fuel cell type NO 2 gas sensor based on MoS 2 nanosheet/Carbon fiber (CF) sensing electrode and Nafion proton conductor , enabling the fuel cell type sensor to detect NO 2 for the first time. The effect of MoS 2 loadings(10, 20, 40, 60 and 80 mg) on the sensors’ performance and the sensitizing mechanism are investigated, the sensor containing 40 mg MoS 2 exhibits the best performance, which can be attributed to the large number of active sites and efficient carrier transport properties of the corresponding electrode materials. At room temperature, the optimal sensor demonstrates a sensitivity of 45.6 nA/ppm to 1–50 ppm NO 2 and an ultra-low detection limit of 28.8 ppb, both the response and recovery time are less than 60 s. This work not only develops a highly sensitive, reversible and fast response NO 2 gas sensor, but also provides insights into sensing electrochemistry, material selection and catalyst/support materials, offering guidelines for future fuel cell type gas sensors to monitor a wider range of environmental pollutants.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Boyan Fu,Leyao Bi,Kexin Zhao,Jiahui Lin,Junsheng Wen,Chunjie Wang,Yue Wang
In this study, LaFeO 3 nanoparticles were synthesized using the hydrothermal method with three different types of surfactants (cationic, anionic, and non-ionic). The products were characterized with various techniques to determine their phase structures, morphologies, sensing abilities, and electrochemical performance. The results indicate that LaFeO 3 prepared with cetyltrimethylammonium bromide (CTAB) as a surfactant (LFO-C) showed a pure orthorhombic perovskite phase with a highly porous surface morphology, and exhibited the largest specific surface area and the lowest impedance among the three materials. The gas-sensing properties of corresponding sensors were also investigated. It is worth noting that LFO-C demonstrated remarkable sensitivity to ethanol at the temperature of 220 °C, with the response reaching 16.1 and a response/recovery time of 35.1 and 25.2 s, respectively. The response of LFO-C is more than twice that of the other two samples with sodium dodecylbenzenesulfonate (SDBS) and polyethylene glycol (PEG) as surfactants. Moreover, LFO-C sensor demonstrated a detection limit of 500 ppb. These findings suggest that CTAB as a cationic surfactant can effectively enhance the gas-sensing performances of LaFeO 3 . Furthermore, the adsorption energy of three samples was calculated by first-principles calculation, and LFO-C possessed strong adsorption capacity for ethanol.
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高影响因子
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