JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 30
·期 11
·4835-4847
·
IF 4.705
Guo Wei,Guo Ruibin,Pei Hebing,Wang Bingjie,Liu Nijuan,Mo Zunli
Electrospinning nanofiber membranes (ENMs) have received widespread attention owing to their favorable permeability, easy preparation, low energy consumption and stability in wastewater treatment technologies. Polyacrylonitrile/polyethyleneimine (PAN/PEI) ENMs were prepared by electrospinning and evaluated in batch experiments for their removal of heavy metal ions (Pb (II), Cr (VI) and Cu (II)) in water. The adsorption capacities of PAN/PEI ENMs for Cr (VI) ions, Cu (II) ions and Pb (II) ions can reach up to 262 mg g −1 , 325 mg g −1 and 346 mg g −1 , respectively. The adsorption procedure follows the pseudo-second-order dynamics model and Langmuir model. In dynamic experiments, the removal rates of Pb (II) ions, Cr (VI) ions and Cu (II) ions can reach 80%, 100% and 80%, indicating that it has excellent removal efficiencies for heavy metal ions. At the same time, PAN/PEI ENMs have high separation ability and excellent flux for oil–water mixtures and oil-in-water emulsions. PAN/PEI ENMs also have the advantages of simple preparation, easy recovery and no secondary pollution to the environment, indicating that PAN/PEI ENMs have some prospects for application in wastewater treatment.
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FIBERS AND POLYMERS
·
2022
·Vol. 23
·期 7
·2030-2041
·
IF 2.347
Gou Bin,Xie Congzhen,Wang Rui,Xu Huasong,Zhou Jiangang,Li Licheng
Carbon-based nanofillers reinforced composites with superb mechanical and electric properties are of growing importance in numerous applications. However, the ultra-high conductivities of carbon-based nanofillers will severely degrade the insulating performance of the polymer, restricting the implementation in electronic domain and power system. Herein, core-double-shell carbon nanotubes coated with silica and polydopamine (CNTs@SO@PDA) are prepared, significantly improving the tensile strength of the composite while maintaining its insulating property. Meanwhile, the sandwich-structured composite which is consisted of CNTs@SO@PDA/epoxy as central layer and boron nitride nanosheets coated by polydopamine (BNNS@PDA) filled epoxy as shielding layers achieved excellent breakdown strength of 19.5 kV/mm as well as superb tensile strength of 64.84 MPa, increasing about 13.37 % and 24.24 % compared with neat epoxy respectively. The simulation results demonstrate the electric field optimization and redistribution effect of sandwich-structured nanocomposites. This work provides a method for fabricating epoxy nanocomposite with marvelous mechanical and insulating properties, which can be applied to future electronic protectors and insulation equipment.
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JOURNAL OF CHEMICAL SCIENCES
·
2022
·Vol. 134
·期 3
·1-9
·
IF 2.15
Bao Wanting,You Junhua,Zhao Yao,Wang Lu,Yao Ruyue
Electrochemical water splitting has excellent application prospects in clean energy technology. However, due to the large overpotential required for the OER reaction during the water-splitting reaction, the modification of electrocatalysts is a vital strategy to address the slow kinetics of the OER reaction. In this paper, a simple and rapid two-step hydrothermal sulfidation method was used to prepare S-modified Ni(OH) 2 nanosheets electrocatalysts at 120 °C. At the same time, the well-designed nanostructured catalyst on the nickel foam substrate exposes a large number of active sites, and the simultaneously generated oxygen vacancies are beneficial to the penetration of the electrolyte and release of O 2 , thus significantly improving the OER performance. In 1.0 M KOH electrolyte, Ni 9 S 8 /Ni(OH) 2 /NF exhibits excellent catalytic activity for OER. The catalyst requires only 430 mV overpotential at a current density of 100 mA cm -2 . In addition, Ni 9 S 8 /Ni(OH) 2 /NF also has excellent long-term stability. Graphical abstract This work reports the formation of Ni 9 S 8 /Ni(OH) 2 /NF heterojunctions by sulfiding Ni(OH) 2 on porous nickel foam. Surprisingly, these Ni 9 S 8 /Ni(OH) 2 /NF heterojunctions exhibit excellent oxygen evolution reaction performance and long-term stability. This is superior to most reported electrocatalysts for oxygen evolution reactions.
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JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 29
·期 6
·1895-1908
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IF 2.523
Li Jinhao,Bao Agula
The current greenhouse effect issue and climate change crisis has urged the advancement of highly efficient and cost-effective CO 2 adsorbents for environmental remediation. We present a sustainable and convenient self-sacrificed templating method for the preparation of nitrogen-doped hierarchical porous carbons (GNCK-X-Y). Glucose serves as a carbon source for the GNCK-X-Y, and graphitic carbon nitride (g-C 3 N 4 ) is used as both a self-sacrificing template and nitrogen doping agent during pyrolysis. The use of these precursors will allow for substantial cost reductions, making the designed materials considerably attractive from an industrial perspective. The adsorbents all demonstrated large specific surface areas and well-developed porosities. Furthermore, the influences of the carbonization temperature and activator on CO 2 capture performance were also systematically investigated. The samples prepared under the optimum conditions exhibit excellent CO 2 uptake capacities of up to 3.65 and 6.12 mmol/g at 25 ℃ and 0 ℃ (1 bar), respectively. The outstanding CO 2 capacity of the material can be attributed to the cooperative effect produced by its surface structure and chemical composition. Additionally, this adsorbent also displays moderate adsorption heat, high CO 2 /N 2 selectivity, excellent reusability and a certain adsorption performance at higher temperatures. These characteristics give the as-synthesized materials broad practical application prospects for CO 2 capture.
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JOM
·
2022
·Vol. 74
·期 9
·3548-3556
·
IF 2.597
Li Shuai,Yang Shenghai,Wang Changhong
Currently, the conventional halide synthesis method of preparing hafnium alkoxides [Hf(OR) 4 , R is an alkyl] has problems of inefficiency, a heavy CO 2 emission footprint, and substantial solid and gas waste, which severely hinders its wide deployment. Herein, we propose an electrodissolution-coupled Hf(OR) 4 synthesis system using an alcohol solvent and Hf metal as feedstock for the efficient, low-carbon and waste-free electro-synthesis of Hf(OR) 4 . The electrochemical behavior of the tetraethylammonium-hydrogen sulfate (Et 4 NHSO 4 )-based EHS process is investigated by cyclic voltammetry, linear sweep voltammetry, Tafel, and electrochemical impedance spectroscopy, complemented with SEM observation. The anodic hafnium dissolution/corrosion occurs inside the passive film while the cathodic ethanol dehydrogenation occurs in a two-stage pathway. Tafel extrapolation and numerical fitting analysis acquires important kinetics parameters, such as corrosion current density, exchange current density, and apparent activation energy as well as solution, polarization and “Warburg” resistances, etc. This work can provide theoretical guidance for the efficient operation of EHS.
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Journal of Coatings Technology and Research
·
2022
·Vol. 19
·期 6
·1687-1695
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IF 2.339
Wang Jinwei,Chen Yiyuan,Ma Jiao
Maleic anhydride-g-poly(1,2-butadiene) (MLPB) is used as a rubber flexibilizer to modify UV-curable polyacrylate coatings (PA) in an attempt to improve their wear resistance and water tolerance. Fourier transform infrared spectra results show that the unsaturated reactive bonds of MLPB fully participate in the UV-curing reaction and successfully copolymerized with acrylates to obtain robust coatings. The smooth and broad differential scanning calorimeter curves show that the cured systems had good compatibility and their glass transition temperatures ( T g ) increase from about 63°C to 74°C with the increase of MLPB addition up to 6 wt%. With the addition of MLPB in PA matrix, their cross-sectional scanning electron microscope (SEM) pictures show brittle features with coarser and dimpled microcracks transforming to toughened fracture morphology with particles offsetting microcrack propagation when MLPB content is added up to 4–6 wt%. The wear scar profiles show that the cross-sectional areas decrease significantly with the MLPB addition, implying the improvement in the wear-resisting ability of PA composite toughened by MLPB; the hardness, impact resistance, and adhesion could be also improved when MLPB was controlled less than 6 wt%. Compared with the pure polyacrylate coatings, the modified coatings exhibited an improvement in water resistance before and after 48-h UV aging.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 6
·1497-1503
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IF 2.726
Qin Yang,Yang Yunhan,He Ran,Zhou Laicheng,Zhang Ling
Enzymes containing 3′ → 5′ exonuclease activities play an important role in various key cellular and physiological processes. The development of fluorescence biosensor is an efficient method to detecting enzyme activity. Herein, a fluorescence resonance energy transfer(FRET) “on” and “off” strategy for detecting exonuclease III(Exo III) activity has been developed. We report here that the double-stranded DNA(dsDNA) enables to bind tightly to self-assembled nanosheets of cationic perylene monoimide derivative(PMI-O7) through electrostatic interaction, and the 6-carboxyfluorescein(FAM)-modified dsDNA could be efficiently quenched via FRET between FAM and PMI-O7. Upon the addition of Exo III, the dsDNA will be digested and the FAM fluorophore will be released, resulting in the fluorescence recovery of FAM. This method provides a simple and sensitive biosensor platform with a low detection limit of 0.077 U/mL for Exo III. Importantly, this method exhibits similar and calibration curves for the detection of Exo III in both buffer and fetal bovine serum samples, indicating that this platform has potential to detect Exo III activity in complex samples.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 53
·80399-80410
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IF 5.19
Shu Xinpeng,Bi Huaqi,Wang Jun,Yang Jiaxin,Wang Jue,Liu Guangqing,Su Bensheng
Catalytic ozonation with supported metal oxides is a promising strategy for addressing refractory pollutants in wastewater. In this study, γ-Al 2 O 3 supported MnO x -CeO x catalysts (MC 1 , MC 2 , and MC 3 ) obtained at different calcination temperatures (400 °C, 550 °C, and 700 °C) were applied as effective catalysts for ozonation and explored the feasibility of the treatment of oxytetracycline (OTC) wastewater. Comparatively, the MC 2 possessed the highest molar ratios of Mn 3+ /Mn 4+ (1.60) and Ce 3+ /Ce 4+ (0.96), the largest surface area (273.8 m 2 g −1 ) with a petal-shaped structure, and most abundant surface hydroxyls (3.78 mmol g −1 ). These physicochemical characteristics benefited the surface reaction and resulted in the acceleration of ozone decomposition, electron transfer, and •OH generation, thereby improving the catalyst’s adsorption ability and catalytic activity. The combination with MC 2 increased the OTC and COD removal of the ozonation process from 59.1% and 29.0% to 94.7% and 83.3% in 25 min, respectively. By employing electron paramagnetic resonance (EPR) and radical quenching experiments, it was verified that •OH species generation promoted the mineralization of OTC. The possible degradation pathways of OTC were investigated through mass spectrometry, and the route consisted of dehydration, deamination, and demethylation. Moreover, during a 12-day continuous experiment, MC 2 catalyst exhibited excellent reusability and catalytic stability, with COD removal efficiencies above 80%.
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PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 12
·6745-6758
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IF 6.123
Zhang Jinyang,Mi Shu,Liu Fei,Qiao Qian,Na Haining,Zhu Jin
Organic solvents with low Henry's constants, such as propylene carbonate (PC) and sulfolane, were proposed to be used as CO 2 absorbents to increase CO 2 absorption capacity in the CO 2 switchable solvent, so that the dissolution of cellulose can be effectively enhanced. With the addition of PC, the maximum concentration achieved for the dissolution of paper cellulose can be largely increased from 1.0 to 5.0 wt%, while those for microcrystalline cellulose and corncob cellulose were increased from 5.0 to 10.0 and 7.0 wt%, respectively. Moreover, the chemical and crystalline structure of the regenerated cellulose was not affected by the addition of CO 2 absorbents. This study illustrated a simple and effective way to modify the CO 2 switchable solvent, which would be helpful for the application of the complex solvent system for the enhanced dissolution, derivatization, and processing of cellulose in the future.
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 9
·4986-4994
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IF 2.047
Cao Zhangyi,Xie Xi,Chen Xin,Yu Jiaqi,Liu Xiukun,Huang Yuanxing,Xu Xu,Lu Shaorong,Li Yuqi
The high wear and temperature resistance of electrode materials are the key issues to extend the application of triboelectric nanogenerators (TENG). The synergistic effect of Fe 3 O 4 and ionic liquid-modified graphene (IGNs) were used to enhance the wear resistance, heat resistance, and mechanical properties of polyimide (PI). Then, the output performance of the PI-based TENG in contact–separation mode was tested. The results show that the tensile strength and thermal decomposition temperature of the IGNs/Fe 3 O 4 /PI composites (2F2G) d increased by 57 MPa and 23°C, respectively, due to the synergistic effect of IGNs and Fe 3 O 4 . In addition, the friction coefficient and wear rate of the 2F2G decreased by 21% and 14%, respectively. The open-circuit voltage, short-circuit current, and peak power density of the 2F2G-based TENG were 65 V, 2.48 μA, and 1.34 W/m 2 at 1 Hz, respectively. Owing to the high wear and temperature resistance of the 2F2G, the 2F2G-based TENG has a broad application prospect in the fields of wear- or high-temperature-resistant energy harvesting and self-powered sensors. Graphical Abstract
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 25
·11725-11734
·
IF 4.682
Cheng Haoyan,Xia Wanting,Zhao Zhipeng,Wang Wenjing,Song Kexing,Li Haitao,Cheng Chu,Hu Hao
Solar-driven water evaporation, a promising method to obtain freshwater resources, has drawn intensive attention recent years due to the abundance of solar energy and scarcity of clean water. Here, we introduce a robust strategy to obtain a series of polydopamine-modified Cu 2− x Se nano-composites (Cu 2− x Se@PDAs) with core@shell structure, which has strong absorption in solar spectrum and outstanding photothermal conversion efficiency for freshwater production. Temperature of the obtained Cu 2− x Se@PDA30 aqueous solution could increase from 19.4 to 70.6 °C in 5 min under the irradiation of 980-nm NIR laser with the power density of 0.002 kW·cm −2 . Under 0.5 simulated sunlight irradiation, water evaporation rates were as high as 3.36 kg·m −2 ·h −1 when using the Cu 2− x Se@PDA30 for desalination, indicating excellent evaporation efficiency under weak light. Moreover, the obtained Cu 2− x Se@PDA30 can also apply to wastewater purification and the evaporation rate could reach 2.71 kg·m −2 ·h −1 under an irradiation of simulated sunlight with intensity of 1 kW·m −2 . These results provided new insight into solar desalination and wastewater treatment using nanoscale semiconductor materials.
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-10
·
IF 17.694
Feng Li-Zhe,Wang Jing-Jing,Ma Tao,Yin Yi-Chen,Song Kuang-Hui,Li Zi-Du,Zhou Man-Man,Jin Shan,Zhuang Taotao,Fan Feng-Jia,Zhu Man-Zhou,Yao Hong-Bin
Hierarchically structured chiral luminescent materials hold promise for achieving efficient circularly polarized luminescence. However, a feasible chemical route to fabricate hierarchically structured chiral luminescent polycrystals is still elusive because of their complex structures and complicated formation process. We here report a biomimetic non-classical crystallization (BNCC) strategy for preparing efficient hierarchically structured chiral luminescent polycrystals using well-designed highly luminescent homochiral copper(I)-iodide hybrid clusters as basic units for non-classical crystallization. By monitoring the crystallization process, we unravel the BNCC mechanism, which involves crystal nucleation, nanoparticles aggregation, oriented attachment, and mesoscopic transformation processes. We finally obtain the circularly polarized phosphors with both high luminescent efficiency of 32% and high luminescent dissymmetry factor of 1.5 × 10 −2 , achieving the demonstration of a circularly polarized phosphor converted light emitting diode with a polarization degree of 1.84% at room temperature. Our designed BNCC strategy provides a simple, reliable, and large-scale synthetic route for preparing bright circularly polarized phosphors.
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