INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Manlin Li,Weiqiu Huang,Bo Tang,Qianxi Fang,Xiang Ling,Aihua Lv
Four different kinds of metal–organic framework (MOF) materials Zn-BTC, Cu-BTC, Cr-BTC, and Fe-BTC are incorporated into alginate, forming various hydrogels for n-hexane vapor adsorption. The cross-link networks between center cations of MOFs and alginate are verified by comparing the Fourier transform infrared characteristic peaks of the MOF/alginates with that of bare alginate. Interestingly, the MOF/alginate composites cross-linked by trivalent cations (Cr3+ and Fe3+) contain micropores while those cross-linked by divalent cations (Zn2+ and Cu2+) do not. The specific surface parameters of the as-prepared hydrogels are affected by the concentration of the alginate. In addition, the Fe-BTC/alginate performs the best n-hexane vapor adsorption capacity among the four kinds of composites. This study would be helpful for a better understanding of the effect of ionic cross-linking on the alginate hydrogel surface area parameters and provide basic knowledge and reference for expanding the applications of the MOF/alginate hydrogels.
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Metals
·
2020
·Vol. 10
·期 7
·927
·
IF 2.117
Xuelei Wang,Qiufeng Wang,Zhaojun Dong,Xiaoqian Zhou,Xiaoliang Wang,Boyan Zhang,Chao Meng
Ti(C,N)-based cermets with multicomponent ingredients were prepared using vacuum sintering technology. The effect of molding agents, binder phase and sintering temperature on Ti(C,N)-based cermets were studied. The optimum molding performance was obtained by adding 2% polyvinyl alcohol (PVA-1788). The microstructure and mechanical properties of Ti(C,N)-based cermets were investigated. The Ti(C,N)-based cermet with a weight percentage of TiC:TiN:Ni:Co:Mo:WC:Cr3C2:C = 40:10:20:10:7:8:4:1 and sintered at 1450 °C had the optimal mechanical properties. The relative bending strength, Vickers hardness, elastic modulus and wear resistance were 2010 MPa, 15.01 GPa, 483.57 GPa and 27 mg, respectively. Additionally, X-ray diffraction (XRD), backscatter scanning electron microscopy pictures (SEM–BSE), energy dispersive spectrometry (EDS) and optical micrographs of Ti(C,N)-based cermets were characterized.Keywords:Ti(C,N)-based cermet;vacuum sintering;NiCoMo powder;microstructure;mechanical properties
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 3
·447-452
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IF 1.063
He Yilei,Zhang Xing,Wei Yanze,Chen Xiaoyu,Wang Zumin,Yu Ranbo
Nanostructured N-doped TiO 2 photocatalyst has been prepared via a new approach from Ti-based MOF[NH 2 -MIL-125(Ti)] precursor. The success of N doping enhances light absorption and narrows the bandgap. Moreover, the as-prepared nanostructure is constructed with tiny nanoparticles and resembles a pie-like morphology inherited from the MOF, which accelerates electron transfer. Hence, as a photocatalyst for the degradation of methylene blue(MB) under visible light irradiation, the N-doped TiO 2 (N-TiO 2 ) nanostructure shows higher photocatalytic activity with a reaction rate constant of 0.018 min −1 than that of the TiO 2 -P25 and TiO 2 under the visible light.
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RSC Advances
·
2020
·Vol. 10
·期 24
·14283-14290
·
IF 3.119
Xin Zhang,Jie Su,Xueyuan Wang,Xiaolei Tong,Fanglian Yao,Caideng Yuan
Graphene aerogels (GAs) were synthesized via a one-step hydrothermal method. Generally, the pore shape and diameter of GAs are difficult to control or the preparation process is complicated, requiring a multi-step operation. Herein, a soft-template one-step hydrothermal synthesis process was proposed to produce GAs with controllable pore sizes. Cyclohexane and n-butanol were added to a graphene oxide suspension to form a uniform aqueous dispersion under emulsification by sodium lauryl sulfate. The reduction process may have occurred around the organic droplets during the hydrothermal reaction, and a large number of organic droplets became countless physical barriers inside the hydrogel. In the later freeze-drying and high-temperature calcination procedures, the droplets evaporated to form a rich pore structure. Compared to the conventional templating method, the organic template was volatilized during the drying process such that no additional process for removing the template was required. In addition, GAs prepared by the template method possessed lower density (2.66 mg cm−3) and better compression performance and, as an adsorbent material, absorbed organic matter and petroleum from wastewater more efficiently than GAs obtained by the traditional one-step hydrothermal method; Q for n-hexane reached 116, and Q for xylene reached 147; also, the GAs prepared by the soft template method can absorb all crude oil in water samples within 30 s.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Li Feng,Shunping Dong,He Zhou,Lijun Yang,Fen Yuan,Yibin Yang,Jingxin Lei,Lixia Bao,Longchun Bian,Jiliang Wang
It is still a big challenge to obtain shape-stabilized nanoencapsulated core-shell phase change materials (NC-PCMs) with the encapsulation ratio up to 90 wt% via surfactant-free method due to the lack of novel nanoencapsulation method and related mechanism. Herein, we for the first time report a novel supramolecular lock shell layer technique without surfactant to facilely prepare shape-stabilized NC-PCMs with the encapsulation ratio range of 70–90 wt%. To this aim, amphiphilic macromolecular nanoreactors with the particle size of ~15 nm were firstly synthesized. n-Dodecanol as the heat storage core was then self-assembled into the nanoreactors under ultrasonification. A thin layer of crosslinked acrylates copolymers was prepared by in-situ grafting polymerization to further stabilize the potentially leaked n-dodecanol. Crystalline structure, morphology, and thermal behavior of the resulting NC-PCMs were extensively investigated. Relevant results indicate that the obtained NC-PCMs fluids show excellent storage stability in the temperature range of −50 to 50 °C, benefiting from their small particle size (60–90 nm) and intense supramolecular interactions between n-dodecanol and the prepared nanoreactors. Phase change temperature of the produced NC-PCMs is very close to that of neat n-dodecanol, no obvious supercooling phenomena have been detected for the produced NC-PCMs. The maximum encapsulation ratio, latent heat, and thermal conductivity of the shape-stabilized NC-PCMs approximate 90 wt%, 180 J g −1 , and 0.1705 W m −1 K −1 , respectively, implying large potential application in the sectors of solar energy storage, waste heat management etc. The developed supramolecular lock-layer technique probably opens a new avenue in the search for NC-PCMs with ultrahigh mass content of core layer.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Shumin Zhang,Lin Li,Xuehong Ren,Tung-Shi Huang
Bacterial cellulose (BC) is a natural polymer with remarkable superiority for fabricating biomaterials. In this study, a multiporous bacterial cellulose (MBC) film was modified with N-isopropylacrylamide (NIPAM), and the modified MBC film was imbued with antibacterial properties after chlorination. The dried chlorinated samples showed superb antibacterial efficacy and could inactivate 6.19 log of inoculated S. aureus and 6.29 log of E. coli within 1 min of contact. After releasing active chlorine for 12 h, 3.67 log of S. aureus and 3.97 log of E. coli were inactivated within 30 min of contact. The prepared films displayed high porous and layered structures with a resultant excellent water retention which can be applied as material for wound dressings. In addition, the chlorinated films showed hemostatic ability on wound bleeding and good biocompatibility. The prepared N-halamine functionalized MBC films might have great potential applications as wound dressings.
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MOLECULES
·
2020
·Vol. 25
·期 8
·1772
·
IF 3.267
Hui Lu,Xia Zhou,Lei Wang,Linhong Jin
A series of newN-phenylacetamide derivatives containing 4-arylthiazole moieties was designed and synthesized by introducing the thiazole moiety into the amide scaffold. The structures of the target compounds were confirmed by1H-NMR,13C-NMR and HRMS. Their in vitro antibacterial activities were evaluated against three kinds of bacteria—Xanthomonas oryzaepv.Oryzae(Xoo),Xanthomonas axonopodispv.Citri(Xac) andX.oryzaepv. oryzicola(Xoc)—showing promising results. The minimum 50% effective concentration (EC50) value ofN-(4-((4-(4-fluoro-phenyl)thiazol-2-yl)amino)phenyl)acetamide (A1) is 156.7 µM, which is superior to bismerthiazol (230.5 µM) and thiodiazole copper (545.2 µM). A scanning electron microscopy (SEM) investigation has confirmed that compoundA1could cause cell membrane rupture ofXoo. In addition, the nematicidal activity of the compounds againstMeloidogyne incognita(M. incognita) was also tested, and compoundA23displayed excellent nematicidal activity, with mortality of 100% and 53.2% at 500 μg/mL and 100 μg/mL after 24 h of treatment, respectively. The preliminary structure-activity relationship (SAR) studies of these compounds are also briefly described. These results demonstrated that phenylacetamide derivatives may be considered as potential leads in the design of antibacterial agents.Keywords:synthesis;thiazole;nematicidal activity;antibacterial activity;structure-activity relationship
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Journal of Oceanology and Limnology
·
2020
·Vol. 38
·期 5
·1517-1531
·
IF 0.617
Tian Jing,Chen Zhuoyuan,Jing Jiangping,Feng Chang,Sun Mengmeng,Li Weibing
The Cu 2 O/TiO 2 p-n heterojunction composite photoelectrodes were prepared by depositing Cu 2 O nanoparticles on the surface of TiO 2 nanotubes via anodic oxidation and constant current deposition. Field emission scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) analyses showed that Cu 2 O nanoparticles not only deposited on the surface of TiO 2 nanotube array, but also on the wall of TiO 2 nanotubes. The Cu 2 O deposition amount could be adjusted by changing the deposition time. The photoelectrochemical cathodic protection (PECCP) performance of the prepared photoelectrodes for 316L stainless steel (SS) was tested under visible light. The constant current deposition time had a significant effect on the PECCP performance of Cu 2 O/TiO 2 -X photoelectrodes and Cu 2 O/TiO 2 -20 had the best PECCP performance for the coupled 316L SS. This was attributed to the appropriate amount and thickness of Cu 2 O to form p-n heterojunctions with TiO 2 , in which separation of the photogenerated carriers was accelerated and transfer of the photogenerated electrons to 316L SS for PECCP was facilitated.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
·
IF 9.038
Saisai Chen,Chaohai Wang,Ming Zhang,Wuxiang Zhang,Junwen Qi,Xiuyun Sun,Lianjun Wang,Jiansheng Li
Fast and efficient tracking of micropollutants in aquatic environment by developing novel electrode materials is of great significance. Herein, a polyvinylpyrrolidone (PVP) assisted strategy is applied for synthesis of nitrogen doped Cu MOFs (N-Cu-MOF) for micropollutants electrochemical detection. The designed N-Cu-MOFs possess uniform octahedral shape with large surface area (1184 m 2 g −1 ) and an average size of roughly 450 nm, exhibiting the excellent electroanalytical capability for the detection of multipollutants. In the case of dopamine (DA) and sulfonamides (SA) as typical microcontaminants, the designed N-Cu-MOFs exhibited wide linear ranges of 0.50 nM–1.78 mM and low detection limit (LOD, 0.15 nM, S / N = 3) for the determination of DA, as well as a linear range of 0.01–58.3 μM and LOD (0.003 μM, S / N = 3) for monitoring SA. The improved performance is attributed to the heteroatom introduction and good dispersion stability of N-Cu-MOF with PVP-decorated. The good electroanalytical ability of N-Cu-MOF for detection of DA and SA can provide a guide to efficient and rapid monitor other micropollutants and construct novel electrochemical sensors.
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Batteries & Supercaps
·
2021
·Vol. 5
·期 1
·e202100203
·
IF 7.093
Yaqian Dong,Yaohui Zhang,Nana Wang,Guifu Zou,Qiang Zhang,Shengquan Gan,Liang He,Zhongchao Bai
Graphical Materials for better SIB anode : The synergistic effects of the one-dimensional N-doped carbon and ultra-small Fe 7 S 8 particles in the reported pod-like Fe 7 S 8 @N−C nanocomposite, improve electrical conductivity and alleviate the volume expansion of the anode of SIB during cycling. One dimensional Fe 7 S 8 @N−C nanocomposite, consisting of Fe 7 S 8 nanoparticles homogeneously embedded in N-doped carbon nanowires, was synthesized by a facile hydrothermal-annealing process. As an anode material for sodium-ion batteries, the electrode exhibited capacities of 481 mA h g −1 after 1000 cycles at 5 A g −1 and 591 mA h g −1 at 200 mA g −1 with a retention ratio of 91 %. The excellent rate performance and cycling stability can be attributed to the synergistic effects of the one-dimensional N-doped carbon and ultra-small Fe 7 S 8 particles, which will improve electrical conductivity and alleviate the volume expansion of the electrode during cycling. This work will afford a great reference for further development of iron sulfides-based anode materials towards high-performance sodium-ion batteries.
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JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Qiulin Li,Heng Liu,Long-Cheng Zhang,Hao Chen,Hongjiu Zhu,Yuanke Wu,Maowen Xu,Shu-Juan Bao
Fe-N and pyridinic-N generally are considered the active sites of Fe-N-C catalyst. In this featured work, small uniform Fe/N-rich polymer spheres are selected to prepare the Fe-N-C catalyst and study how the sintering atmosphere (NH 3 , Ar, and H 2 ) to engineer their products. The findings reveal that the sintering atmosphere greatly affected not only the composition , aggregate state, and morphology of Fe, but also the graphitization degree and pore structure of carbon. In addition, XPS results suggest that Fe-N-C-NH 3 possesses the highest Fe-N and pyridinic-N content. Combining its abundant pores, high graphitization, and large specific surface area, the catalyst obtained in NH 3 atmosphere delivers best ORR catalytic performance (E 0 = 0.97 V, E 1/2 = 0.85 V vs RHE), which is even comparable to commercial Pt/C (E 0 = 0.97 V, E 1/2 = 0.83V vs RHE). Moreover, the catalyst exhibits greater stability and methanol resistance than those of Pt/C.
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RSC Advances
·
2019
·Vol. 9
·期 66
·38891-38896
·
IF 3.049
Qiaohong Zhang,Honghao He,Huibin Wang,Zhan Zhang,Chen Chen
A series of N-alkyl pyridinium salts were synthesized and employed as metal-free catalyst for the selective oxidation of methyl aromatic hydrocarbon with molecular oxygen. The electronic effect of the substitutes was found to be an important factor for the catalytic performance. With the introduction of electron-donating substitute –N(CH3)2, the conversion of p-xylene and selectivity of p-toluic acid could be simultaneously increased. 1-Benzyl-4-N,N-dimethylaminopyridinium salt showed the highest catalytic activity, and 95% conversion with 84% of selectivity to p-toluic acid could be obtained for the selective oxidation of p-xylene. Several methyl aromatic hydrocarbons could all be efficiently oxidized with the reported catalyst at the absence of any metal species.
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