COMPOSITES PART B-ENGINEERING
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2022
·
IF 11.322
Zizhang Zhan,Wei Sun,Shuaishuai Zhang,Qingbo Wen,Hongbo Zhang,Xiang Xiong
A (AlCrMg) x (PO 4 ) y /MgO composite(APMC) was prepared based on the acid–base reaction between MgO and chromium aluminum phosphate solution for thermal protection and insulation applications at ultrahigh-temperatures up to 2400 °C. The compositions, formation mechanisms, microstructure, mechanical properties , thermal conductivity and ablation resistance of the composite were systematically investigated. The results show that the (AlCrMg) x (PO 4 ) y /MgO composite can be consolidated in different shapes at room temperature. The compressive strength of the as-prepared porous composites is higher than 20 MPa due to the macromolecular network structure, and it can be further improved to 42 MPa via thermal treatment. After ablation by an oxyacetylene flame at 2400 ± 70 °C for 60 s, the mass and line ablation rates of the composite were 0.0195 g/s and 0.43 × 10 −3 mm/s, respectively, which are comparable to those of ultrahigh-temperature ceramics. The excellent ablation resistance can be attributed to the in situ formation of a dense protective layer composed of spinel MgCr 2 O 4 and MgO phases. Interestingly, during ablation at 2400 °C the back-side temperature of the 15 mm-thick sample was lower than 130 °C, suggesting outstanding thermal insulation performance. The temperature gradient leads to the formation of a gradated porous structure which reduces the overall thermal conductivity of the composite.
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高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
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2022
·Vol. 52
·期 11
·1607-1616
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IF 2.925
Zhang Yi,Zhang Liwen,Gong Tingcui,Li Tianhao,Li Xuenuan,Feng Jun,Tang Tingfan,Cheng Hao
Due to the highly porous structure, metal organic framework (MOF)-derived materials are extensively applied in the field of electroanalysis. In this experiment, an effective electrochemical sensing based on Co 3 O 4 /C-derived ZIF-67 MOF had been constructed for ultrasensitive determination of quercetin at trace level. The resultant Co 3 O 4 /C porous polyhedron of morphology and nanostructure were carefully examined using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Brunauer–Emmett–Teller (BET) techniques. Differential pulse anodic stripping voltammetry (DPV) method was adopted to analyze quercetin under the optimized conditions. The DPV response of Co 3 O 4 /C film-coated glass carbon electrode (Co 3 O 4 /C/GCE) for quercetin determination was achieved a long linearity ranging from 0.5 to 30 µM, achieving high sensitivity about 1.830 × 10 − 6 A cm − 2 µM − 1 , and the detection limit was calculated to be 0.022 µM (S/N = 3). Besides, the fabricated Co 3 O 4 /C/GCE displayed excellent selectivity, desirable repeatability, and good reproducibility. More importantly, the proposed sensor exhibited satisfactory recovery ranges and accuracy for the determination of trace quercetin in human urine and serum samples, which will make it as an alternative advantageous choice for practical on-site determination. Graphical abstract
The porous Co 3 O 4 /C polyhedron derived by ZIF-67 MOF was successfully synthesized.
The as-synthesized material was employed to prepare chemically modified electrode
for ultrasensitive determination of quercetin. Then the Co 3 O 4 /C-modified glass carbon electrode is displayed good sensitivity and accuracy toward quercetin in urine and
serum samples.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Mingzhe Li,Wenli Yao,Min Yu,Changduo Sun,Xinquan Deng,Fengjuan Chen,Lei Zhou,Yian Zheng
Hydrogels possess 3D network with abundant reactive groups, and can bind with active metal ions within their confined 3D structure for fabricating functional materials . In this study, a chitosan grafted polyacrylic acid (CTS-g-PAA) hydrogel was prepared for loading Fe 2+ , which was then converted into magnetic Fe@C via subsequent pyrolysis process . In Fe@C activated peroxymonosulfate (PMS) (Fe@C/PMS) system, the degradation behaviors of ciprofloxacin (CIP) were systematically investigated, including influencing parameters, reactive oxygen species (ROSs), degradation mechanism and potential eco-toxicity of degradation intermediates. The results showed that CTS-g-PAA supported, in-situ derived magnetic Fe@C had not only stable catalytic ability at pH 3.0–9.0, but also high degradation efficiency in the presence of inorganic Cl − and HCO 3 − (5–20 mM) as well as organic humid acid (10 and 20 mg/L). Under the optimized conditions, the degradation efficiency of CIP could reach to 96.84 % within 1 h. In Fe@C/PMS system, the main ROSs involved free radicals SO 4 •− , •OH, O 2 •− and non-free radical 1 O 2 . Through free radical quantitative experiments, the concentration of SO 4 •− and •OH at 60 min was determined respectively to be 11.84 µM and 0.14 µM, proving the dominant role of SO 4 •− . By HPLC-MS analysis, the degradation products were proposed via four degradation pathways, including hydroxylation, defluorination and decarboxylation, as well as the ring opening of quinolone and piperazine. Finally, the potential eco-toxicity of CIP and its degradation intermediates was evaluated by using ECOSAR method based on quantitative structure–activity relationships analysis.
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高影响因子
Materials Chemistry Frontiers
·
2022
·Vol. 6
·期 17
·2524-2534
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IF 8.683
Xinyan Lv,Zhonglin Wei,Canyu Cui,Wenwen Wang,Yumei Tan,Shihui Jiao,Guangsheng Pang
Developing superhydrophobic material with good chemical stability, non-toxic and low-cost for effectively handling oil spill incidents, chemical leakages and industrial oily wastewater has become an urgent need. In this work, superhydrophobic Fe3O4@C microspheres have been successfully anchored on polyurethane (PU) sponge skeleton surface with polyvinylidene fluoride (PVDF) as intermediate layer. The superhydrophobic Fe3O4@C/PVDF/PU sponge possesses outstanding superhydrophobic performance with water contact angle (WCA) of 156.5° and sliding angle (SA) of 6°. Meanwhile, the Fe3O4@C/PVDF/PU sponge shows excellent chemical, thermal and mechanical stabilities under harsh conditions, high separation efficiencies for surfactant-stabilized organic solvent/water emulsions (more than 99.6% for both O/W and W/O emulsions) and preferable recyclability (more than 15 cycles). The comprehensive performances of the Fe3O4@C/PVDF/PU sponge make it a promising candidate for the treatment of industrial oily wastewater.
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高影响因子
ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Yuying Chen,Qing Yang,Wenqin Lu,Yanjuan Zhang,Zuqiang Huang,Huayu Hu,Tao Gan
Although the core–shell structure magnetic nanocomposites have been widely used as lubricant additives, their tribological properties are still poor under high temperature and high load. Herein, the graphitized C/Fe3O4 magnetic nanocomposites (g-C/Fe3O4) with an interpenetrating network structure were successfully fabricated by an in situ hydrothermal carbonization method combined with a subsequent ball milling process at room temperature. The results showed that the ball milling process not only promoted the transformation of graphitized carbon but also effectively eliminated the interfacial effect between carbon and Fe3O4. Moreover, the g-C/Fe3O4 used as a lubricant additive in rapeseed oil exhibited excellent tribological properties and high thermo-stability under 155 °C and 980 N, with the friction coefficient reduced by 32.8% compared to the independent Fe3O4. The enhanced tribological performance of g-C/Fe3O4 could be attributed to the graphitized carbon and its interpenetrating network structure under low load force (392 N), while under high load force (980 N), it could be ascribed to the synergistic effect between the graphitized carbon and magnetic Fe3O4 nanoparticles. This work not only offers a method for the synthesis of nanocomposite lubricant additives but also shows great potential in practical applications for high-temperature tribology.
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PubMed
高影响因子
DESALINATION
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2022
·
IF 11.211
Xiaowen Huo,Zhaojing Jing,Haitao Wang,Na Chang
Nanofiltration membranes based on polyamide (PA) are widely used in fields such as brackish water desalination and drinking water purification due to their excellent retention of multivalent salts. However, uncontrolled and extremely fast polymerization easily produces thicker PA layers, which reduces permeability. Moreover, smooth support layer usually leads to PA layers with low roughness, which is not benefit for improving of flux. Based on these aspects, an innovative method of co -regulating interfacial polymerization based on anionic surfactant sodium dodecyl sulfate (SDS) and carbonized-UIO-66 (C-UIO-66) nanoparticles has been reported. The adsorption of anionic surfactant on the surface of C-UIO-66 slows down the diffusion rate of aqueous monomer and helps to form thin PA layer (<33 nm) which is thinner than the original thin film composite (TFC) membrane (144.29 ± 17.62 nm). Besides, C-UIO-66 nanoparticles with different sizes are deposited on the surface of the support layer, providing rougher surface for interfacial polymerization. Due to the irregular surface of SDS/C-UIO-66 intermediate layer, the prepared PA layer has folded structure. Compared with original TFC membrane, the preferred thin film nanocomposite (TFN) nanofiltration membrane possesses permeation flux of 58.59 L·m −2 ·h −1 , which increased by 114.3 % together with the maintaining the rejection rate of Na 2 SO 4 above 96 %.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Zifen Fan,Jiaxin Ren,Huiying Bai,Panpan He,Liang Hao,Ning Liu,Bingyu Chen,Ran Niu,Jiang Gong
The integration of freshwater and electricity cogeneration through photothermal effect is regarded as a new and promising strategy for high-efficiency solar energy utilization. However, the central issue is the design of low-cost, flexible photothermal materials to efficiently utilize solar energy. Herein, flexible MnO/C nanoparticle-based solar evaporators are constructed to realize simultaneously interfacial solar evaporation and thermoelectricity generation. The MnO/C nanoparticle is facilely fabricated by pyrolysis of Mn-MOF, which is synthesized from discarded poly(ethylene terephthalate) bottles in one-pot solvothermal method. By altering pyrolysis temperature of Mn-MOF from 400 °C to 700 °C, the morphology of MnO/C nanoparticle is readily tailored from cube to sphere, octahedron and polyhedron. Owing to the fast water transport, strong sunlight absorptivity, high solar-to-heat conversion efficiency, and low evaporation enthalpy, the hybrid solar evaporator presents the high evaporation rate of 2.38 kg m −2 h −1 and solar-to-vapor conversion efficiency of 98.4% under 1 Sun irradiation, surpassing many advanced photothermal materials. More importantly, integrated with a thermoelectric module, the bifunctional solar evaporator recovers low-grade heat from water evaporation to perform thermoelectric conversion, achieving the maximum output voltage of 330 mV under 3 Sun irradiation. This work highlights the potential of flexible and durable solar evaporators for freshwater and power cogeneration, not merely contributing to achieving carbon neutrality and upcycling of waste plastics, but also opening opportunities for giant electricity supply from sustainable solar energy.
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Advanced Fiber Materials
·
2022
·Vol. 4
·期 5
·1177-1190
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IF 12.958
Zan Guangtao,Wu Tong,Dong Wenya,Zhou Junchen,Tu Teng,Xu Ruoxuan,Chen Yun,Wang Ying,Wu Qingsheng
Due to the lack of in-depth understanding about the folding issues of the electronic materials, it is a huge challenge to prepare a super-foldable and highly electrochemical faradic electrode. Here, inspired from from the fully nimble structures of cuit cocoons and cockscomb petals, with two-level biomimetic design, for the first time we prepared a super-foldable and electrochemically functional freestanding cathode, made of C-fiber@NiS-cockscomb (SFCNi). In virtue of its nimble biomimetic structures, SFCNi can remarkably sustain over 100,000 times, repeated true-folding without composite fibers fracture, functional matters detachment, conductivity degradation, or electrochemical performance change. The main mechanism behind these behaviors was disclosed by Real-time scanning electron microscopy and mechanical simulations, on the folding process. Results unveil that the cockscomb-like NiS with atomic thickness can deform freely due to the need of bending, and the cuit-cocoon-like SFCNi can generate an “ ε-shape ” folding structure at the crease. Such a smart self-adaptive deformation capability can effectively reduce the effect of stresses and local excessive deformations, so that the chemical bonds can preserve their interaction, and the material won’t fracture. This subtle and exceptional mechanical behavior realizes a super-foldable property. The two-level biomimetic design strategy is a novel method for fabrication of super-foldable composite electrodes and integrated multi-functional super-foldable devices. Graphical abstract
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RSC Advances
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2022
·Vol. 12
·期 16
·9543-9549
·
IF 4.036
Tanlun Wang,Chenxiang Sun,Yong Yan,Fan Li
Metal–N–C-based catalysts prepared by pyrolysis are frequently used in the oxygen reduction reaction (ORR). Zeolitic imidazolate frameworks (ZIFs), a type of metal organic framework (MOF), are selected as precursors due to their special structure and proper pore sizes. A series of Fe–N–C catalysts with different concentrations of 2-methylimidazole were prepared with a simple solvothermal-pyrolysis method, and the transformation productivity, morphology and ORR activity were investigated. It was found that the Fe–N–C catalyst with a 2-methylimidazole concentration of 0.53 mol L−1 had the best performance. In 0.1 M KOH solution, the half-wave potential was 0.852 V (vs. RHE), with the highest electrochemically active surface area (ECSA) of 94.1 cm2, and the ORR reaction was dominated by a 4-electron process. The current only decreased by 10.5% after 50 000 s of chronoamperometry (CA), while the half-wave potential only decreased 20 mV in 3 M methanol. Additionally, this catalyst cannot be poisoned by Cl− and SO32− ions in the ORR process. Finally, some typical ions including SCN−, Fe(CN)63− and Fe(CN)64− were used to inhibit the active sites, and it was determined that Fe(II) is the real active species. The series of synthesis and testing experiments has significance in guiding optimization of the synthesis conditions and analysis of the mechanism of active sites in Fe–N–C materials.
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PubMed
高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 11
·e202200375
·
IF 4.782
Junting Sun,Jiaxiang Jin,Yatao Chang,Jing Wang,Qindong Zhang,Junjie Guo
Graphical Ramping rate matters in pyrolysis : Hybrid Co/N−C electrocatalysts were synthesized using NaCl as template via direct pyrolysis method. Ramping rates during pyrolysis was evidenced to affect the porosity and composition of the obtained electrocatalysts due to the different diffusion rates and decomposition reaction of precursors, which have significant influences on their catalytic activities toward oxygen reduction. Pyrolysis is a necessary procedure for synthesizing carbon-based nonprecious metal electrocatalysts via stimulating interaction and carbonization of precursors. In this work, ramping rates that correlated with thermal gradient has been investigated to reveal the configuration evolution of the precursors. Spectra characterizations demonstrated that ramping rates affected decomposition and aromatization of precursors. Increasing ramping rates improved the percentage of doped nitrogen and defects, promoting dispersion of Co atoms in the carbonaceous matrix and increasing density of active sties. In addition, the size variation of NaCl template under different ramping rates modifies the porous structure of Co/N−C electrocatalysts, greatly increasing the percentage of macropores and micropores at rapid ramping rates. As a result, electrocatalysts obtained at 5 °C min −1 exhibit comparable catalytic activity to that of Pt/C due to highly dispersed active sites and rational percentage of porosity, facilitating the sufficient reaction of oxygen along the catalysts. These results shed lights on regulating physical properties of carbonaceous electrocatalysts.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 42
·63233-63247
·
IF 5.19
Ma Mingliang,Chen Yan,Jiang Jiabin,Bi Yuxin,Liao Zijian,Ma Yong
Excessive discharge of toxic dyes is detrimental to ecological system and human health. Therefore, an effective photocatalyst must be designed and developed to degrade dyes from wastewater. Herein, a novel one-dimensional (1D) flower-like recoverable ZnFe 2 O 4 /C/MnO 2 /BiOI magnetic composite photocatalyst was synthesized via electrospinning technique combined with hydrothermal method. The photocatalytic activities of composite photocatalyst were evaluated by degrading methyl orange (MO) and Rhodamine B (RhB) under simulated light irradiation. The efficiency of ZnFe 2 O 4 /C/MnO 2 /BiOI photocatalyst in visible light for 150 min reached 91% (MO) and 120 min reached 94% (RhB). Moreover, the degradation rate of MO still remained 78% after five cycles. The design of 1D magnetic flower-like composite provided a new strategy for preparing photocatalysts possessing excellent photocatalytic efficiency and cyclic stability.
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高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
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2022
·
IF 4.446
Lihui Jiang,Yuheng Han,Juan Xu,Ting Wang
A cellulose-based hydrogel with synergistic therapeutic effect was prepared by a one-pot method. The hydrogel had hydroxyethyl cellulose (HEC) as a framework and epichlorohydrin (EPI) as a cross-linking agent. Cationic-β-cyclodextrin (C-β-CD) was homogeneously embedded in the grid of the cross-linked structure. Zinc oxide nanoparticles (ZnO NPs) and menthol were used to provide analgesic and bactericidal effects . Menthol was uniformly loaded onto the hydrogel matrix by the addition of C-β-CD and increased the solubility of menthol in water. ZnO NPs were synthesized by in situ hydrothermal treatment . The positively charged group of C-β-CD and the active hydroxyl group of HEC were used to distribute the ZnO NPs uniformly on the hydrogel matrix without significant agglomeration. The hydrogel had a smoothly ordered and compact morphology. It exhibited adequate mechanical, swelling, water retention and oxygen permeability properties in tests. In addition, the hydrogel had an efficient bactericidal effect. Release experiments showed that the encapsulation of menthol by C-β-CD allowed for a slow release of menthol. Biocompatibility tests had shown that the hydrogel was non-toxic to normal human cells.
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