SENSORS
·
2018
·Vol. 18
·期 5
·1448
·
IF 2.475
Han Song,Zhijie Luo,Mingyao Liu,Gang Zhang,Wang Peng,Boyi Wang,Yong Zhu
In the present work, centrifugal deposited Au-Pd core-shell nanoparticle (NP) film was proposed for the room-temperature optical detection of hydrogen gas. The size dimension of 44, 48, 54, and 62 nm Au-Pd core-shell nanocubes with 40 nm Au core were synthesized following a solution-based seed-mediated growth method. Compared to a pure Pd NP, this core-shell structure with an inert Au core could decrease the H diffusion length in the Pd shell. Through a modified centrifugal deposition process, continues film samples with different core-shell NPs were deposited on 10 mm diameter quartz substrates. Under various hydrogen concentration conditions, the optical response properties of these samples were characterized by an intensity-based optical fiber bundle sensor. Experimental results show that the continues film that was composed of 62 nm Au-Pd core-shell NPs has achieved a stable and repeatable reflectance response with low zero drift in the range of 4 to 0.1% hydrogen after a stress relaxation mechanism at first few loading/unloading cycles. Because of the short H diffusion length due to the thinner Pd shell, the film sample composed of 44 nm Au-Pd NPs has achieved a dramatically decreased response/recovery time to 4 s/30 s. The experiments present the promising prospect of this simple method to fabricate optical hydrogen sensors with controllable high sensitivity and response rate at low cost.
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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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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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ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Zehui Sun,Zhihao Gu,Wei Ma
Understanding the basic physicochemical properties of gas molecules confined within nanobubbles is of fundamental importance for chemical and biological processes. Here, we successfully monitored the nanobubble-confined electrochemical behaviors of single platinum nanoparticles (PtNPs) at a carbon fiber ultramicroelectrode in HClO4 and H2O2 solution. Due to the catalytic decomposition of H2O2, a single oxygen nanobubble was formed on individual PtNPs to block the active surface of particles for proton reduction and to suppress their stochastic motion, resulting in significantly distinguished current traces. Furthermore, the combination of theoretical calculations and high-resolution electrochemical measurements allowed the nanobubble size and the oxygen gas density inside a single nanobubble to be quantified. Moreover, the ultrahigh oxygen density inside (1046 kg/m3) was revealed, indicating that gas molecules in a nanosized space existed with a high state of aggregation. Our approach sheds light on the gas aggregation behaviors of nanoscale bubbles using single-entity electrochemical measurements.
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AICHE JOURNAL
·
2022
·Vol. 69
·期 3
·e18005
·
IF 4.167
Xia Hua,Jian Han,Xin Zhou,Yong Xu
Oxygen, as a terminal electron acceptor, is an essential substrate in the aerobic bio-oxidation process, affecting bacterial vitality and bio-oxidation performance. In this study, a newfangled platform biotechnology of sealed-oxygen supply bioreactor (SOS-BR) was developed by improving gas pressure to significantly intensify oxygen transfer rate to resolve the formidable barriers of aerobic catalysis. In virtue of SOS-BR, the bio-productivity was greatly improved for three representative substrates (xylose, furfural, and glycerol) bio-oxidation with the whole-cell catalysis of Gluconobacter oxydans . The determination of oxygen transfer coefficient ( K L α ) established an upgraded theoretical dynamic model for gas pressure intensification biosystem. Additionally, viscosity measurement and combined pressure control strategy explained the inflection point phenomenon of productivity and confirmed the intensify mechanism. The smart strategy of significantly intensifying oxygen transfer provided insightful ideas for overcoming the stubborn obstacle of obligate aerobic catalysis, and further promoted the development and industrial practicability of bio-oxidation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Chunyang Lu,Yangqin Gao,Wei An,Chengcheng Yan,Fengshan Yu,Wenyi Lu,Chunxia Wang,Guoyong Huang
Distinct from the traditional synthesis of NiCo 2 O 4 nanoflowers from hydrothermal approach. Herein a facile gas-liquid diffusion method was exploited to prepare NiCo 2 O 4 and Fe-doped NiCo 2 O 4 nanoflower under ambient condition for oxygen evolution reaction (OER). The remarkable nanoflowers was generated by diffusing ammonia to the homogeneous solution of cobalt and nickel sulfate salt with slight amount of Fe sulfate salt to form a heterogeneous precipitation, followed by pyrolysis to afford the final product of NiCo 2 O 4 or Fe-doped NiCo 2 O 4 . The remarkable feature of NiCo 2 O 4 displays a spherical nanoflower morphology composed of lamellar structure with excellent dispersibility and greatly prompt the electron transfer and enable a high activity. By varying the ratio of Ni to Fe to 9:1, a superior OER performance with overpotential of 256 mV and Tafel slope of 69 mV·dec −1 at 10 mA·cm −2 was obtained. We attribute the superior performance to the excellent gas and ion transport channels due to the unique nanoflower structure as well as the well optimized electronic structure derived from Fe doping. Besides, we tentatively propose a detailed formation process for the formation of this nanoflower structure based on co-precipitation reaction. In conclusion, this approach offers a facile and efficient way for the preparation of high-performance ternary mixed metal oxides nanostructure which enable its large-scale production of OER catalyst.
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FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Luoming Kang,Airong Li,Yuan Lu,Yuling Ma,Cheng Wang
Mercaptans as volatile organic sulfur compounds would cause environmental pollution. Researches are focused on the removal of mercaptans by solvent absorption method. In this work, a new efficient absorbent of 1-butyl-3-methylimidazolyl alanine ([Bmim]Ala) was prepared and evaluated by the removal of mercaptans from the model gas containing methyl mercaptan (MeSH, 307.6 mg/m 3 ), ethyl mercaptan (EtSH, 201.1 mg/m 3 ) and propyl mercaptan (PrSH, 149.9 mg/m 3 ) in nitrogen. The results showed that the removal rate of MeSH, EtSH and PrSH was 97.77, 98.12 and 100.00%, respectively, at a temperature of 35 °C and a pressure of 1.00 bar for 2 min. After 6 recycling times, [Bmim]Ala remained a good performance for the removal of mercaptans. The desulfurization mechanism was proposed that the absorption sites were mainly on the alanine anion (Ala − ) and Ala − could be replaced by the thiol anion (RS − ) to form a new ionic liquid 1-butyl-3-methylimidazolyl thiolate ([Bmim] + RS − ). Meanwhile, since the electrostatic interaction between -COO − in Ala − and H -g on the imidazolium cation could be destroyed by the -SH group, the -COO − group would interact with mercaptans to form a strong H-bond. The amino in Ala − and the -SH group could form Lewis acid-base compounds.
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Nanomaterials
·
2022
·Vol. 12
·期 24
·4464
·
IF 5.719
Baohui Zhang,Chong Li,Min Li,Chen Fu,Ran Tao,Honglang Li,Jingting Luo
Nitrogen dioxide is one origin of air pollution from fossil fuels with the potential to cause great harm to human health in low concentrations. Therefore, low-cost, low-power-consumption sensors for low-concentration NO2detection are essential. Herein, heterojunction by SnO2quantum wires, a traditional metal oxide NO2sensing material, and Ti3C2TxMXene, a novel type of 2D layered material, was synthesized using a simple solvothermal method for enhancing gas-sensing performance and reducing operating temperature. The operating temperature was reduced to 80 °C, with a best performance of 27.8 and a fast response and recovery time (11 s and 23 s, respectively). The SnO2and Ti3C2TxMXene composite exhibits high speed and low detection limit due to the construction of the heterojunction with high conductive Ti3C2TxMXene. The selectivity and stability of gas sensors are carried out. This could enable the realization of fast response, high-sensitivity, and selective NO2sensing under low operating temperatures.Keywords:Ti3C2TxMXene;SnO2;gas sensor;NO2;nanocomposite
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高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 308
·期 5
·2200567
·
IF 4.402
Zhibo Huang,Xiaohui Wu,Yan Shi,Liqun Zhang
Organic montmorillonite/brominated butyl rubber nanocomposites are prepared by improved solution blending, i.e., preparation of organic clay suspension and suspension blending with brominated butyl rubber solution by adding polytetramethylene ether glycol as interface agent. Scanning electron microscopy and atomic force microscopy show that polytetramethylene ether glycol has good dispersing effect on organic clay. Transmission electron microscopy and X-ray diffraction analysis demonstrates that both intercalated and exfoliated structures are obtained in organic montmorillonite/brominated butyl rubber nanocomposites. The mechanical performances and the gas barrier properties of the organic montmorillonite/brominated butyl rubber nanocomposites are improved greatly, which proves that the high-performance clay/rubber nanocomposites are prepared in nonpolar solvent.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jiajie Wang,Bairen Yang,Zhuqiu Sun,Qingqing Shang,Junheng Zhang
This study aimed to investigate the performance of biotrickling filters (BTFs) in the microbial degradation of m -dichlorobenzene ( m -DCB) to construct an enhanced treatment of removing m -dichlorobenzene ( m -DCB) at different concentrations of rhamnolipids (RLs) and lanthanum (La 3+ ) or neodymium (Nd 3+ ) ions. We found a significantly enhanced removal of m -DCB when 110 mg/L of RLs and 0.2 mg/L La 3+ or 0.4 mg/L Nd 3+ ions were added. The addition of RLs and La 3+ or Nd 3+ ions increased the m -DCB average removal efficiency (101–110 days) by 19.7% and 22.7%, respectively, when the inlet m -DCB concentration was 800 mg/m 3 and the empty bed residence time (EBRT) was 60 s. Further, the mechanisms that strengthened the mass transfer were the decrease of contact angle, surface tension, and Henry’s constant after the addition of RLs and La 3+ or Nd 3+ ions in the nutrient solution; further, we noticed a significant increase in the dissolved oxygen levels. Improvements in the performance of BTFs were associated with enhanced microbial community and an increased abundance of functional genes. In conclusion, the addition of RLs and La 3+ or Nd 3+ ions can enhance the performance of BTFs in degrading m -DCB by improving mass transfer and microbial activity simultaneously.
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Theranostics
·
2022
·
IF 11.6
Bingshuai Zhou,Xiaolin Sun,Biao Dong,Siyao Yu,Liang Cheng,Songtao Hu,Wei Liu,Lin Xu,Xue Bai,Lin Wang,Hongwei Song
Antibacterial photodynamic therapy (aPDT) has emerged as an attractive treatment option for efficient removal of pathogenic bacteria. However, aPDT in deep tissue will encounter difficulties such as limited light penetration depth, insufficient oxygen (O 2 ) supply and inability to eliminate inflammation introduced by bacteria, which hinders its clinical application. Herein, the near infrared (NIR) strategy of simultaneously generating O 2 and CO was developed for aPDT based antibacterial therapy and mitigation of deep infection inflammation. Methods: We prepared NIR-mediated multifunctional aPDT nanoplatform (POS-UCNPs/ICG) producing therapeutic gas of O 2 and CO. The CO, O 2 and ROS generation of the nanoplatform were characterized by dye probes, respectively. The antibacterial activity and anti-inflammation of POS-UCNPs/ICG were demonstrated in vitro and in vivo . In addition, the therapeutic effects in vivo were serially analyzed by immunofluorescence staining, Masson's staining, hematoxylin and eosin staining, colony formation units (CFU) and so on. Results: NIR-mediated multifunctional aPDT nanoplatform was realized by combining the up-conversion nanoparticles (UCNPs) and partially oxidized SnS 2 (POS) nanosheets (NSs) as well as indocyanine green (ICG). Using a single 808 nm light, aPDT can be achieved via ICG molecules, meanwhile, O 2 /CO can be generated by POS NSs through upconversion light excitation. During the aPDT process, O 2 can enhance aPDT, while CO can regulate inflammation through the PI3K/NF-κB pathway. Therefore, POS-UCNPs/ICG groups had a highest percentage of healing area up to 91.55±1.26% in mouse abscess model. Conclusion: Due to enhanced aPDT and anti-inflammatory collaborative therapy, the POS-UCNPs/ICG composites showed remarkably accelerated recovery in animal abscess models. Such NIR light responsive nanoplatform with optimized antibacterial capacity and immunomodulatory functions is promising for clinical therapeutics of bacteria-induced infections.
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CHIRALITY
·
2022
·Vol. 34
·期 3
·462-472
·
IF 2.183
Zhen Wang,Wan-Qi Xiong,Zhi-Feng Huang,Gai-Zhao Qin,Min Zi,Li-Ming Yuan
Chiral covalent organic framework materials have many excellent properties, which have received much attention in the field of separation. Synthesized the covalent organic framework COF-TpBD (NH 2 ) 2 modified, respectively, by L-valine trifluoroacetyl derivative, L-hydroxyproline, and (1S)-(+)-10-camphorsulfonyl chloride, three capillary columns of chiral covalent organic framework materials were obtained for gas chromatography. Those columns are able to separate some chiral compounds, positional isomers, n-alkanes, n-alcohols, aromatic hydrocarbon mixture, and Grob's reagents. They are complementary to other chiral capillary columns and are possible for potential applications.
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