CHINESE JOURNAL OF CATALYSIS
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2022
·
IF 12.92
Yingnan Zhao,Xing Qin,Xinyu Zhao,Xin Wang,Huaqiao Tan,Huiying Sun,Gang Yan,Haiwei Li,Wingkei Ho,Shun-cheng Lee
Bismuth-based photocatalysts are a class of excellent visible-light photocatalysts; however, their redox activity is relatively poor and the efficiency of photogenerated carrier separation is low, limiting their development and application in the field of photocatalysis . To address these issues, a series of polyoxometalate PW 12 O 40 3– -doped Bi 2 O 3– x /Bi Schottky photocatalysts PW 12 @Bi 2 O 3– x /Bi- n (PBOB- n , where n is the amount of NaBH 4 , i.e., 6, 12, 18, 24, and 48 mg) were prepared by a simple electrospinning/calcination/in-situ NaBH 4 reduction method. In this composite photocatalyst, the doping of PW 12 could effectively adjust the electronic structure of Bi 2 O 3– x and improve its redox properties. As a shallow electron trap, PW 12 promoted the separation of the photogenerated carriers. Furthermore, desirable Schottky junction between the metal Bi nanoparticles and PW 12 @Bi 2 O 3– x further accelerated the separation of the photogenerated carriers. The synergistic effect of the aforementioned factors endowed PBOB- n with excellent photocatalytic activity. Among the samples, PBOB-18 exhibited superior photocatalytic activity. Under visible-light irradiation, 93.7% (20 mg catalyst) of 20 ppm tetrabromobisphenol A (TBBPA, 20 mL) was degraded in 60 min. Its activity was 4.4 times higher than that of Bi 2 O 3 . PBOB-18 also exhibited an ultrahigh photocatalytic performance for the removal of NO. Its removal rate (600 ppb) reached 83.3% in 30 min, making it one of the most active Bi-based photocatalysts. Furthermore, the photocatalytic mechanisms of PBOB-18 for TBBPA and NO have been proposed. This work provides a new direction and reference for the design of low-cost, efficient, stable, and versatile photocatalysts.
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COMPOSITES SCIENCE AND TECHNOLOGY
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2022
·
IF 9.879
Chenglin Li,Hao Zhang,Xiaowen Zhang,Zechao Zhang,Nan Li,Ying Liu,Xiuting Zheng,Dali Gao,Daming Wu,Jingyao Sun
With the continuous development of modern electronic equipment, thermal management of electronic devices has become the focus of attention due to the energy consumption. As an important part of thermal management system, it is necessary to develop an electrical equipment shell with both superior thermal conductivity and mechanical properties for better thermal management performance. However, it is very difficult to balance the relationship between thermal conductivity and mechanical properties of thermal conductive polymer composites . Increasing filling content of thermal conductive fillers would lead to heavy damage of mechanical properties. In this paper, we construct a bi-continuous structure to solve this problem. The ABS phase provides thermal conductivity enhancement, while the PC phase is responsible for mechanical property maintaining. A highest thermal conductivity of 0.476 W/(m⋅K), 138% higher than that of pure PC, can be obtained after optimum design of formulation and processing conditions. Meanwhile, the mechanical properties of PC/ABS composite are also enhanced comparing with filled-PC. Moreover, the reported PC/ABS composite has excellent electrical insulation and dielectric properties . Overall, our PC/ABS composites with simultaneous enhanced thermal conductivity and mechanical properties are of great prospect as electrical equipment shells for efficient thermal dissipation .
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 21
·52209
·
IF 3.057
Yong Guo,Zhongwei Chen,Yuan Yu,Tingting Chen,Qingwu Zhang,Changxin Li,Juncheng Jiang
A new-type flame retardant DEZ of bi-DOPO compound containing bi-hydroxy and two amino groups, was synthesized from terephthalonitrile, hydroxylamine hydrochloride, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, and used with curing agent 4,4′-diamino-diphenylmethane to prepare flame retard epoxy resin (EP) composites. 1 H and 31 P nuclear magnetic resonance spectra and Fourier transform infrared spectra have determined the chemical structure of DEZ. The properties of cured EP composites were explicitly evaluated by differential scanning calorimeter, thermogravimetric analysis, the limiting oxygen index (LOI), vertical burning (UL-94) test, cone calorimetry test, and flexural test. The 1 wt% addition of DEZ could improve the EP composites by almost 14.4% of flexural strength and 29.6% of flexural modulus, respectively. The LOI of EP composites with 5 wt% of DEZ was 29.7% and EP composites reached a V-0 rating in the UL-94 test, as well as total heat release was decreased by 11.2%. All EP modified by DEZ exhibited a blow-out effect in the combustion process, which was due to the release of pyrolysis gases and incombustible gases containing phosphorus radicals and nitrogen compounds.
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ACS Omega
·
2022
·
IF 4.132
Shan-Shan Wu,Li-Jun Hao,Yuan-Yuan Shi,Zhuo-Jian Lu,Jia-Lin Yu,Si-Qi Jiang,Qing-Ling Liu,Ting Wang,Shi-Ying Guo,Ping Li,Fei Li
Wang-Bi capsule (WB) is a traditional Chinese medicine (TCM)-based herbal formula, and it has been used in the treatment of rheumatoid arthritis (RA) in China for many years. Additionally, WB is also used as a supplement to the treatment of osteoarthritis (OA) in clinical practice. Our research aimed to reveal the therapeutic effects and underling mechanism of WB on RA and OA through computational system pharmacology analysis and experimental study. Based on network pharmacology analysis, a total of 173 bioactive compounds interacted with 417 common gene targets related to WB, RA, and OA, which mainly involved the PI3K-Akt signaling pathway. In addition, the serine–threonine protein kinase 1 (AKT1) might be a core gene protein for the action of WB, which was further emphasized by molecular docking. Moreover, the anti-inflammatory activity of WB in vitro was confirmed by reducing NO production in lipopolysaccharide (LPS)-induced RAW264.7 cells. The anti-RA and OA effects of WB in vivo were confirmed by ameliorating the disease symptoms of collagen II-induced RA (CIA) and monosodium iodoacetate-induced OA (MIA) in rats, respectively. Furthermore, the role of the PI3K-Akt pathway in the action of WB was preliminarily verified by western blot analysis. In conclusion, our study elucidated that WB is a potentially effective strategy for the treatment of RA and OA, which might be achieved by regulating the PI3K-Akt pathway. It provides us with systematic insights into the effects and mechanism of WB on RA and OA.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2022
·Vol. 128
·期 9
·1-10
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IF 2.983
Wu Xiang-Feng,Fu Yun-Xuan,Chang Tian-Long,Jia Yun-Ning,Shang Jia-Lu,Wang Hui,Fan Zi-Hao,Wang Chen-Xu,Su Jun-Zhang,Ci Li-Jie
Bi nanoparticles were used to fabricate Bi/Bi 2 O 3 heterojunction by an in situ sintering method in a muffle furnace. The experimental results show that the surface plasmon resonance (SPR) effect and oxygen vacancy (OV) defects of Bi/Bi 2 O 3 hybrids can enhance the visible-light absorption and carrier separation efficiency, and thus improve the photocatalytic activity of Bi/Bi 2 O 3 composites for tetracycline (TC) degradation under visible-light illumination. Moreover, by means of increasing the calcination time of Bi nanoparticles, the photocatalytic degradation efficiency of the as-prepared hybrids shows a tendency of first increasing and then decreasing. When the calcination time was 15 min, a maximum value of 81.7% was reached within 60 min. This is higher than that of 16% of the pristine Bi nanoparticles. In addition, h + plays a major role during the degradation reaction of TC. This study can provide promising guide for the rational design and development of Bi-based photocatalysts and degradation of antibiotics under solar light illumination.
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RENEWABLE ENERGY
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2022
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IF 8.634
Qianqian Zhang,Lei Zhao,Fen Ran
Hydrogel electrolytes are attracting growing interest in the various fields, and tremendous efforts have been widely made for enhancing the hydrogel electrolyte of flexible devices. However, conventional hydrogel electrolytes generally contain non-degradable and non-renewable polymer matrix materials, inevitably causing waste of resources and environmental pollution, which fundamentally restricts the utilization of hydrogel electrolyte in the aspect of energy storage device during daily use. In this work, a novel flexible hydrogel electrolyte, that can be reducible, recyclable, and reusable (3R), is fabricated through physical and chemistry double crosslinking among carboxylated chitosan, N -methylol acrylamide, N, N′ -methylene bisacrylamide, and potassium persulfate, followed by intense uptake of Li 2 SO 4 electrolyte. The hydrogel electrolyte membrane displays high ionic conductivity of 3.52 × 10 −2 S cm −1 , and exhibits 348.92% electrolyte uptake., The flexible quasi-solid supercapacitor assembled with the hydrogel electrolyte shows remarkable electrochemical performance like high capacitance retention of 83% and outstanding energy density of 8.74 Wh kg −1 . Interestingly, the renewable performance of hydrogel electrolyte membrane is observed when the hydrogel electrolyte membrane suffered from heating to cooling cycle, which allows to easily realize multiple regeneration of electrolyte membrane based on the reversible sol-gel transition. This work provides a promising route to design a hydrogel electrolyte membrane with infinite regeneration times for flexible energy storage devices in the future.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2022
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IF 5.876
Yanghuan Huang,Haocheng Zhang,Lou Gao,Tianlan Yan,Yueer Yan,Yahong Zhang,Yi Tang
A series of Zr–Al-MWW zeolites with different Zr state and layer-stacking structure are successfully synthesized via direct grafting zirconocene dichloride onto the external silanols of three kinds of MWW zeolites, i.e. MCM-22 with multilayered structure, ITQ-2 (through layer delaminated route) and OL-MWW (by direct hydrothermal synthesis) with oligolayered structure. The structure, porosity and state of grafted Zr species are distinctly different among the three Zr–Al-MWW zeolites. Zr-OL-MWW possesses the highest content of single Zr atoms with an ideal micro-meso-macro pore system, while Zr-MCM-22 and Zr-ITQ-2 contain two kinds of Zr species (ZrO 2 clusters and single Zr atoms) coexisting in various proportions. The high dispersion of single Zr atoms on OL-MWW can be assigned to the large amount of external silanols of OL-MWW. The as-prepared three bi-functional Zr–Al-MWW zeolites are used for the cascade Meerwein-Ponndorf-Verley (MPV) reduction and etherification (ETH) reaction. Among them, Zr-OL-MWW shows dramatically higher conversion of cinnamaldehyde and yield of 1-cinnamyl 2-propyl ether than Zr-MCM-22 and Zr-ITQ-2, owing to the higher catalytic activity of Lewis acid centers from single Zr atoms, as well as more integrated framework Al sites as Brønsted acid centers with good accessibility. This study offers a simple and efficient strategy to construct Lewis-Brønsted acidic zeolites with exposed heteroatom sites and integrated framework structure, which will provide especial potential in the catalytic conversion of macromolecules.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 38
·2205054
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IF 19.924
Qiyu Lian,Lingling Hu,Dingren Ma,Yimu Jiao,Dehua Xia,Yajing Huang,Zhuoyun Tang,Wei Qu,Huinan Zhao,Chun He,Daniel D. Gang
Molecular O 2 activation on metallic oxide-based catalysts surfaces is pivotal for catalytic oxidation reactions but highly depends on the O 2 activation pathways or mechanisms. Thus, comprehensively understanding the mechanism of efficient O 2 activation is conducive to extending the fundamental principles for O 2 activation theories and designing novel catalysts for catalytic oxidation reactions. In this study, it is declared that the interstitial atomic Bi (IA Bi) anchored in the lattice interstice of MnO 2 (Bi/MnO 2 ) is capable of triggering an alternative twofold O 2 activation boosting the catalytic oxidation reactions at room temperature. Explicitly, the IA Bi facilely induces the local lattice distortion reconstructing the local charge landscape, thus weakening the O 2 dissociation energy barrier by elongating the O O bond length. And, the charge-alternating process engineered by the IA Bi drives the alternative twofold O 2 activation of the adjacent lattice oxygen and adsorbs dangling oxygen assisted by the consecutive O 2 replenishment. Conclusively, this study not only declares the role of IA Bi in driving the charge-alternating process during the twofold O 2 activation but also extends the fundamental principles toward O 2 activation mechanisms for catalytic oxidation reactions via atomic makeup engineering.
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Catalysts
·
2021
·Vol. 11
·期 9
·1126
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IF 4.146
Qingman Li,Qihua Jiang,Pengcheng Gu,Lianju Ma,Yiwu Wang
Ni2+-NTA-boosted magnetic porous silica nanoparticles (Ni@MSN) to serve as ideal support for bi-functional enzyme were fabricated for the first time. The versatility of this support was validated by one-step purification and immobilization of bi-functional enzyme MLG consisting of 3-Quinuclidinone reductase and glucose dehydrogenase, which can simultaneously catalyze both carbonyl reduction and cofactor regeneration, to fabricate an artificial bi-functional nanobiocatalyst (namely, MLG-Ni@MSN). The enzyme loading of 71.7 mg/g support and 92.7% immobilization efficiency were obtained. Moreover, the immobilized MLG showed wider pH and temperature tolerance and greater storage stability than free MLG under the same conditions. The nanosystem was employed as biocatalyst to accomplish the 3-quinuclidinone (70 g/L) to (R)-3-quinuclidinol biotransformation in 100% conversion yield with >99% selectivity within 6 h and simultaneous cofactor regeneration. Furthermore, the immobilized MLG retained up to 80.3% (carbonyl reduction) and 78.0% (cofactor regeneration) of the initial activity after being recycled eight times. In addition, the MLG-Ni@MSN system exhibited almost no enzyme leaching during biotransformation and recycling. Therefore, we have reason to believe that the Ni@MSN support gave great promise for constructing a new biocatalytic nanosystem with multifunctional enzymes to achieve some other complex bioconversions.Keywords:porous silica nanoparticles;immobilized enzyme;nanosystem;cofactor regeneration;(R)-3-quinuclidinol;biocatalysts’ recycling
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Nanomaterials
·
2021
·Vol. 11
·期 11
·3038
·
IF 5.076
Tao Shi,Zhiheng Zheng,Huan Liu,Dezhen Wu,Xiaodong Wang
Electromagnetic (EM) and infrared (IR) stealth play an important role in the development of military technology and the defense industry. This study focused on developing a new type of multifunctional composite film based on polyimide (PI)/graphene/Fe3O4hybrid aerogel and polyethylene glycol (PEG) as a phase change material (PCM) for EM and IR bi-stealth applications. The composite films were successfully fabricated by constructing a series of PI-based hybrid aerogels containing different contents of graphene nanosheets and Fe3O4nanoparticles through prepolymerizaton, film casting, freeze-drying, and thermal imidization, followed by loading molten PEG through vacuum impregnation. The construction of PI/graphene/Fe3O4hybrid aerogel films provides a robust, flexible, and microwave-absorption-functionalized support material for PEG. The resultant multifunctional composite films not only exhibit high microwave absorption effectiveness across a broad frequency range, but also show a good ability to implement thermal management and temperature regulation under a high latent-heat capacity of over 158 J/g. Most of all, the multifunctional composite films present a wideband absorption capability at 7.0–16.5 GHz and a minimum reflection loss of −38.5 dB. This results in excellent EM and IR bi-stealth performance through the effective wideband microwave absorption of graphene/Fe3O4component and the thermal buffer of PEG. This study offers a new strategy for the design and development of high-performance and lightweight EM–IR bi-stealth materials to meet the requirement of stealth and camouflage applications in military equipment and defense engineering.Keywords:electromagnetic and infrared bi-stealth;phase change material;polyimide-based aerogels;graphene/Fe3O4hybrid;thermal regulation;microwave absorption
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高影响因子
SYNTHETIC METALS
·
2020
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IF 3.286
Anfeng Zhu,Honglong Xing,Qi Fan,Xiaoli Ji,Ping Yang
Sheet aluminum powder was used as the substrate and aniline as the polymer monomer, to design novel Al/PANI composites via in-situ polymerization, which exhibited high electromagnetic wave absorption properties and low infrared emissivity. These unique bifunctional composite were systematically characterized by X-ray powder diffraction, Fourier transform infrared spectroscopy , scanning electron microscope, IR-2 dual-band emission rate measuring instrument and vector network analyzer. The calculated results showed that the maximum reflection loss value of Al/PANI composite reached −46.09 dB at 14.56 GHz with a film thickness of only 1.0 mm. Meanwhile, the infrared emission rate of the composite was 0.55. The excellent electromagnetic absorption performance may be ascribed to its superior conductivity and unique structure. The merits of as-synthesized composites with high-performance microwave absorbing properties and low infrared emissivity indicate the potential use of Al/PANI composites in the applicable stealth fields.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 11
·1-8
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IF 6.232
Zou Jin,Zhong Wei,Gao Feng,Tu Xiaolong,Chen Shangxing,Huang Xigen,Wang Xiaoqiang,Lu Limin,Yu Yongfang
A multilayer Bi-BTC/reduced graphene oxide (Bi-BTC/rGO) (BTC, 1,3,5-benzenetricarboxylic acid) film electrode was adopted to construct a highly sensitive Pb 2+ electrochemical sensor. The multilayer Bi-BTC/rGO films were prepared via alternate cast of Bi-BTC and graphene oxide (GO) on a glassy carbon electrode, followed by electro-reduction of the GO components. Bi-BTC has porous broom-like structure and its organic ligand has abundant functional groups, which are favorable for Pb 2+ adsorption and preconcentration. The introduction of rGO layer improves the conductivity of the MOFs material. Moreover, the multilayer composite structure greatly increased the exposure of active sites and the surface area of reactive contact, finally realizing the highly sensitive detection of Pb 2+ . Pb 2+ was determined by differential pulse anodic stripping voltammetry and the response current was recorded at − 0.62 V. The [Bi-BTC/rGO] 2 electrode provides a wide linear response ranging from 0.062 to 20.72 μg/L and a low limit of detection (LOD) of 0.021 μg/L (S/N = 3) for Pb 2+ , which is lower than the guideline value proposed by the World Health Organization. The method has been applied to determine Pb 2+ in industrial wastewater with recoveries of 99.2–104% and RSDs of 3.4–4.0% ( n = 3).
Graphical abstract Graphical abstract Schematic representation of an electrochemical sensor for the detection of Pb 2+ was designed based on long broom-like structure bismuth(II) metallic organic framework/reduced graphene oxide ([Bi-BTC /rGO] 2 )
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