JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Shujun Sun,Jun Zhang,Changdong Sheng,Hui Zhong
Currently, most advanced oxidation denitrification technologies require long flue gas residence time to obtain ideal NO removal efficiency. The NaOH-catalyzed H 2 O 2 system proposed in this paper can obtain 98% NO removal efficiency under the condition of flue gas residence time of 3 s. The mechanism of NO removal and H 2 O 2 decomposition to O 2 were proposed. It was confirmed with ESR (Electron-spin-resonance), inhibitor experiments and UV-Vis spectrophotometer that the main group in the reaction process was·O 2 - radicals, which reacted with NO to form ONOO - , and ONOO - would be gradually transformed into NO 3 - and NO 2 - in the air. The effect of some primary factors on the NO removal efficiency and the percentage of H 2 O 2 decomposition to O 2 were also investigated. The increase of initial pH has a positive effect on NO removal, while the promotion of NO removal by increasing H 2 O 2 concentration and reaction temperature is limited and the increase of NO has a negative effect on NO removal. Initial pH has a dual impact on the percentage of H 2 O 2 decomposition to O 2 , H 2 O 2 concentration and reaction temperature promote the decomposition of H 2 O 2 to O 2 , while NO concentration has an inhibiting effect on it.
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Bioactive Materials
·
2022
·
IF 16.874
Shichen Liu,Yao Sun,Teng Zhang,Longtao Cao,Zhiwei Zhong,Haoxin Cheng,Qingqing Wang,Zhuang Qiu,Weimin Zhou,Xiaolei Wang
Thromboembolism is the leading cause of cardiovascular mortality. Currently, for the lack of targeting, short half-life, low bioavailability and high bleeding risk of the classical thrombolytic drugs, pharmacological thrombolysis is usually a slow process based on micro-pumping. In addition, frequently monitoring and regulating coagulation functions are also required during (and after) the process of thrombolysis. To address these issues, a targeted thrombolytic and anticoagulation nanoplatform (UCATS-UK) is developed based on upconversion nanoparticles (UCNPs) that can convert 808 or 980 nm near-infrared (NIR) light into UV/blue light. This nanoplatform can target and enrich in the thrombus site. Synergistic thrombolysis and anticoagulation therapy thus could be realized through the controlled release of urokinase (UK) and nitric oxide (NO). Both in vitro and in vivo experiments have confirmed the excellent thrombolytic and anticoagulative capabilities of this multifunctional nanoplatform. Combined with the unique fluorescent imaging capability of UCNPs, this work is expected to contribute to the development of clinical thrombolysis therapy towards an integrated system of imaging, diagnosis and treatment.
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OPTICS AND LASER TECHNOLOGY
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2022
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IF 4.939
Cui Chen,Wenlin Feng
A novel optic-fiber intensity-modulated carbon monoxide (CO) gas sensor based on cerium dioxide (CeO 2 ) sensing film which coated thin-core fiber (TCF) was proposed and fabricated. Single-mode fiber (SMF), no-core fiber (NCF) and TCF are symmetrically spliced to form a SMF-NCF-TCF-NCF-SMF Mach-Zehnder interference structure. The crystal structure, surface morphology and composition of CeO 2 sensing membrane have been characterized by using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscope, high resolution transmission electron microscopy, high-angle annular dark-field and energy dispersive spectrum. The sensing film with the porous appearance can be successfully achieved by the hydrothermal reaction and dip-coating method. While the CO concentration is ranging from 0 to 70 ppm, the sensitivity and detection limit of the optic-fiber CO gas sensor are, respectively, 0.03224 dB/ppm and 0.07630 ppm, and it has a good linearity (0.99127) and almost insensitive to temperature. The response time and recovery time are about 40 s and 47 s, respectively. The surface adsorption and desorption sensing mechanism has been discussed in detail. In addition, CO can be detected by the sensor with unexceptionable selectivity, which has also been verified by the surface adsorption energy results between CeO 2 and seven gases, i.e., oxygen (O 2 ), carbon dioxide (CO 2 ), argon (Ar), ammonia (NH 3 ), nitrogen (N 2 ), hydrogen sulfide (H 2 S) and carbon monoxide (CO). This sensor is simple in structure, and easy to manufacture. It has a good application prospect in the toxic CO monitoring.
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JOURNAL OF POLYMER RESEARCH
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2022
·Vol. 29
·期 4
·1-11
·
IF 3.061
Lou Ching-Wen,Zhang Xiaoyang,Wang Yanting,Zhang Xuefei,Shiu Bing-Chiuan,Li Ting-Ting,Lin Jia-Horng
Sulfur dioxide (SO 2 ) pollution often poses a threat to the environment and human health, and there is an urgent need to develop flexible and convenient SO 2 detection materials. MOF-5 treated with amino groups was added to polyvinyl alcohol, and then MOF-5-NH 2 /Polyvinyl alcohol (PVA) nanocomposite films were made by electrostatic spinning technology, and the MOF-5-NH 2 /PVA composite films such as mechanical and thermal stability and sensing of SO 2 were systematically investigated. The results show that the MOF-5-NH 2 /PVA nanocomposite film has a certain tensile strength of 1.42 MPa, and the thermal stability of the MOF-5-NH 2 /PVA nanocomposite film is getting better as the ratio of MOF-5-NH 2 /PVA increases and the diameter of the fiber becomes smaller. Moreover, the produced composite film has fluorescence turn-on effect only for SO 2 , but not for other gases, showing a good specificity. Therefore, this study provides a new strategy for the preparation of highly sensitive and specific SO 2 sensors.
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Nanoscale Advances
·
2022
·Vol. 4
·期 5
·1345-1350
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IF 5.598
Jian Wang,Essalhi Fatima-Ezzahra,Jie Dai,Yanlei Liu,Chengjie Pei,Hai Li,Zhiwei Wang,Xiao Huang
The development of flexible room-temperature gas sensors is important in environmental monitoring and protection. In this contribution, by using 1-octadecanethiol (ODT) as a surface ligand, Au nanodots (NDs) with ultra-small size of ∼1.7 nm were deposited on the surface of α-Fe2O3/reduced graphene oxide (rGO). The Au ND–ODT/α-Fe2O3/rGO composite was fabricated into flexible gas sensors, which could detect NO2 gas down to 200 ppb at room temperature. Compared with α-Fe2O3/rGO, Au ND–ODT/α-Fe2O3/rGO showed enhanced sensing performance because of the beneficial effects of Au NDs, including facilitating the adsorption of NO2 molecules and forming ohmic-like contact with rGO and α-Fe2O3. In addition, the sensing performance of the composite was also influenced by the surface ligands of the Au NDs. Ligands with less polar terminal groups were found to be beneficial to charge transfer in the sensing film. Moreover, Au ND–ODT/α-Fe2O3/rGO-based flexible sensors showed negligible performance deterioration under moderately bent conditions, suggesting their potential to be used in portable and wearable devices.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Shuwen Yu,Ben Qin,Fan Yang,Meiying Xie,Liyan Xue,Zhigang Zhao,Kaixian Wang
Reduced graphene oxide (rGO) membranes have shown promising separation and purification in the fields of water treatment and gas capture due to their unique physicochemical characteristics. However, how to further reduce the transport resistance of rGO membranes and improve separation performance is still a thorny issue. In this work, the reported metal-crosslinked rGO membranes showed a reverse-selective separation behaviors for the adsorbed gas molecules at low pressure. The effect of metal ions on the membrane structure and the separation performance were investigated. Metal ions not only can improve the cross-linking structure and control interlamellar spacing of rGO membranes for the precise molecular sieve, but also can provide abundant metal sites to enhance the affinity, which led to a diffusion-controlled process for the targeted gas molecules. The resulting metal-crosslinked rGO membranes presented outstanding gas permeance and selectivity for gas pairs of the He/CO 2 , N 2 /CO 2 and Kr/Xe, with the highest selectivity of 21, 11.4 and 4.1, respectively. The work will provide a new avenue towards specific molecule capture for the development of rGO membranes in the fields of natural gas purification and radioactive gas recovery.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Chengyu Sun,Kunyin Wang,Bernard Wiafe Biney,Weining Li,Wenxu Li,Kun Chen,He Liu,Aijun Guo
Hypothesis Rigid polyurethane , a common insulation material, is difficult to degrade naturally and poses significant health and environmental risk. Consequently, the cost-effective and efficient reuse of these solid wastes is a great challenge. Experiments Herein, we report an in-situ construction of hexadecyltrimethoxysilane (HDTMS) hydrophobic films on rigid polyurethane waste particle (RPUWP) as an accumulated packing layer in the gas-liquid pre-separator for gas pre-dehydration. Findings The RPUWP grafted with HDTMS (P-HDTMS) packing layer exhibits excellent hydrophobicity in the air, acid (pH = 1), alkali (pH = 14), and high-temperature (over 95 ℃) resistance. Also, the gas pre-dehydration performance of the accumulated P-HDTMS packing layer in the gas-liquid pre-separator was evaluated by the water dew point depression (ΔT d ). It is worth mentioning that the accumulated packing layer can stabilize and greatly reduce the ΔT d by 17.8 ℃ in over 48-hour uninterrupted operation through the coalescence separation mechanism. Therefore, the low-cost accumulated P-HDTMS packing layer is expected to be an ideal candidate material for gas pre-dehydration in large-scale practical applications. This work not only provides a novel method for the resource utilization of plastic solid wastes but also provides a hitherto unexplored perspective for gas dehydration in industrial production.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Cong Guan,Jiaming Cai,Xiaotao Liu,Liangqia Guo
The detection of trace water (H 2 O) content is important and challenging in food and food-related industries. Herein, highly crystalline two-dimensional covalent organic frameworks (TAPT-BTCA-COF) with yellow-green fluorescence were prepared by using 1,3,5-tris(4-aminophenyl)triazine (TAPT) and 1,3,5-benzenetricarboxaldehyde (BTCA) as precursors. The fluorescence of TAPT-BTCA-COF is sensitive to the solvent polarity due to the intermolecular charge transfer (ICT) effect and can be quenched by trace H 2 O due to the block of ICT effect by H 2 O. On this base, TAPT-BTCA-COF is applied for sensing of trace H 2 O in common organic solvents such as DMF, acetonitrile , THF and acetone with fast response and high sensitivity. The limits of detection for H 2 O in DMF, acetonitrile, THF and acetone are 0.082 wt%, 0.0053 wt%, 0.0091 wt% and 0.0061 wt%, respectively. Furthermore, a ratiometric fluorescent sensor is proposed by using TAPT-BTCA-COF as the signal probe and red fluorescent tris(2,2′-bipyridyl)ruthenium(II) dichloride as the reference and successfully applied for quantitatively and semi-quantitatively sensing of trace H 2 O in honey sample and the moisture in N 2 gas.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Jianchun Jiang,Qingmeng Pi,Jiahang Zhou,Yixuan Du,Yunbo Li
Ammonia is increasingly deemed a significant, green sustainable fuel which requires a large number of detection devices. In this study, ultrathin AuNWs/PEDOT:PSS Janus films had been prepared with ultrathin AuNWs film treated with H 2 S which could integrate with PEDOT:PSS film closely. The resulting transparent and flexible Janus film sensor showed the good response and selectivity performance to ammonia gas. Moreover, the sensitivity of Janus film devices to ammonia was greatly improved and the conductivity of the Janus films was kept well with increasing thermal annealing temperature. The limit detection for NH 3 was 500 ppb concentration and the improvement mechanism of the sensing performance was attributed to the increased surface area of conductive polymer . This method provides a universal platform to integrate different materials into Janus films and prepare next-generation flexible detection sensors.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Qingli Qu,Anquan Yang,Jing Wang,Min Xie,Xiaoli Zhang,Dan Huang,Ranhua Xiong,Dong Pei,Chaobo Huang
Chitosan microparticles are frequently used for the encapsulation of ingredients, owing to their pH-responsive, renewable, biocompatible and antimicrobial properties. Herein, pH-responsive antibacterial encapsulation carriers in chitosan-phytate (CS-PA) microparticles with various morphologies were prepared by gas-shearing microfluidics . Microparticles sizes were tuned by gas flow rate in production, and the CS and PA concentration significantly dominated the morphology of microparticles. Additionally, microparticles exhibit great storage stability, lyophilizing rehydration performance, pH-responsive behavior, as well as antibacterial and biocompatible effect, indicating that CS-PA microparticles are expected to become an ideal carrier for the actives encapsulation in pharmaceutical, food and cosmetic industries.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Gang Li,Shuanshi Fan,Zijian Zhang,Yanhong Wang,Xuemei Lang,Jing Li
SAPO-34 zeolite membranes were activated by ultraviolet (UV) radiation at low temperatures to reduce grain boundary defects. The successful detemplation of SAPO-34 zeolite powders using UV radiation was confirmed by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and nitrogen adsorption-desorption. The irradiance exerted a significant impact on the quality of UV-detemplated SAPO-34 membranes. Under optimal UV detemplation conditions, SAPO-34 membranes showed a moderate H 2 permeance of ∼10 −7 mol Pa −1 m −2 s −1 , with a H 2 /i-C 4 H 10 permselectivity over 75 under room temperature. The membranes showed an exceptionally low CO 2 permeance in comparison with N 2 and CH 4 despite the smaller molecular size of CO 2 , resulting in an unprecedentedly high H 2 /CO 2 permselectivity over 50, which was ascribed mainly to the intense interaction between the CO 2 molecules and confined organic structure directing agent (OSDA) residue in membrane channels. The temperature dependence of singe-gas permeance through SAPO-34 zeolite membranes showed that gases, including He, H 2 , CO 2 , CH 4 , C 2 H 6 , C 3 H 8 , and i-C 4 H 10 , markedly increased as the temperature increased, indicating an activated diffusion mechanism. The activation energies for H 2 permeation through the SAPO-34 membranes were 17–23 kJ mol −1 , which were reasonable based on the correlation between the activation energy for H 2 permeation and the average pore size for reported membranes by assuming minimal grain boundary defects in the UV-detemplated SAPO-34 membranes.
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RSC Advances
·
2021
·Vol. 12
·期 1
·517-527
·
IF 3.361
Qingping Xin,Meixue Zhao,Jianping Guo,Dandan Huang,Yinan Zeng,Yuhang Zhao,Teng Zhang,Lei Zhang,Shaofei Wang,Yuzhong Zhang
Exploring a new type of smart membrane with tunable separation performance is a promising area of research. In this study, new light-responsive metal–organic framework [Co(azpy)] sheets were prepared by a facile microwave method for the first time, and were then incorporated into a polymer matrix to fabricate smart mixed matrix membranes (MMMs) applied for flue gas desulfurization and decarburization. The smart MMMs exhibited significantly elevated SO2(CO2)/N2 selectivity by 184(166)% in comparison with an unfilled polymer membrane. The light-responsive characteristic of the smart MMMs was investigated, and the permeability and selectivity of the Co(azpy) sheets-loaded smart MMMs were able to respond to external light stimuli. In particular, the selectivity of the smart MMM at the Co(azpy) content of 20% for the SO2/N2 system could be switched between 341 and 211 in situ irradiated with Vis and UV light, while the SO2 permeability switched between 58 Barrer and 36 Barrer, respectively. This switching influence was mainly ascribed to the increased SO2 adsorption capacity in the visible light condition, as verified by adsorption test. The CO2 permeability and CO2/N2 selectivity of MMMs in the humidified state could achieve 248 Barrer and 103.2, surpassing the Robeson's upper bound reported in 2019.
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