JOURNAL OF POLYMER RESEARCH
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2023
·Vol. 30
·期 12
·1-10
·
IF 2.8
Liu Chengyi,Du Guicai,Guo Qunqun,Li Ronggui,He Hongwei,Li Changming
Polylactic acid (PLA) is a kind of widely used, biodegradable, biomass polymer material, and the PLA fibrous material with high antibacterial efficiency has attracted more and more attention. In this article, the electrospinning (e-spinning) technique was employed to fabricate PLA nanofiber membrane and by adding the reducing natural rosmarinic acid (RosA) and graphene oxide (GO) into the e-spinning solution, it was found that RosA and GO reacted to a certain extent, which led to a stable e-spinning solution system. After carried out e-spinning, the as-prepared fiber of PLA/Rosa0.1/GO was thinner in average diameter, 520 nm, lower than those of pure PLA or PLA/RosA. The strength of the fibrous membrane was enhanced, reaching 2.4 times of pure PLA one, and its water contact angle decreased from 137° to 123°. At the same time, the as-obtained membrane of PLA/Rosa0.1/GO had high porosity (82.8%) and filtration efficiency (91.0%), with high QF value of 0.077 Pa -1 . More importantly, due to the synergy of RosA and GO, the antibacterial efficiency has been greatly improved. This electrospun nanofiber membrane has promising applications in personal protective equipment and air filtration industry.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2023
·Vol. 38
·期 6
·1255-1261
·
IF 1.6
Tan Shifeng,Tu Wenmao,Pan Hongfei,Zhang Haining
Catalysts consisting of Zeolite imidazolyl ester skeleton-67 (ZIF-67) and graphene oxide (GO) were fabricated through a solvothermal method, followed by etching ZIF-67 with oxygen-rich functional groups on GO in a reduction atmosphere at 400 °C. During this process, an open type of cobalt metal center was formed by the partial vaporization and oxidation of ZIF-67, further reducing to Co and partially combining with oxygen species to amorphous CoO x . Benefiting from the rich functional N, and metal/oxides active centers derived from the calcination process, the synthesized Co/CoO x @NSG-400 showed a low OER overpotential of 10 mA·cm −2 at 298 mV, and an ORR half-wave potential of 0.8 V, which demonstrated its excellent bifunctional catalytic activity. Such a controllable calcination strategy with high yields could be expected to pave the way for synthesizing low-cost and efficient bifunctional electrocatalysts.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lei Hu,Liwen Bo,Nengze Wang,Mengxuan Sun,Xiaohe Ren,Zhijie Li,Chunyang Jia
For most consumer electronics, the volumetric performance of energy storage devices is usually more significant than traditional gravimetric performance. Zinc-ion capacitors (ZICs) are regarded as one of the most promising energy storage devices with high energy and power density. However, the low volumetric performance of the cathode is a serious problem that hinders its practical application. Herein, in this work, a compact freestanding graphene film was designed by tuning the interlayer structure of flame reduced graphene oxide sheets (FRGO) using graphene oxides (GO) via a self-assembly strategy. When the mass ratio of FRGO and GO is 75%:25%, the optimum of graphene film between density and electrochemical performance was achieved. The graphene film owns a bulk density of 0.82 g cm −3 and precisely regulated abundant mesoporous around 3.8 nm, which provides more active sites for ion storage. Profiting from the pseudocapacitance reaction between C=O and Zn 2+ , the compact graphene film with a thickness of 35 μm as ZICs cathode can deliver a high volumetric energy density of 113.1 Wh L -1 and outstanding gravimetric performance of 118.7 Wh kg −1 with a bulk density of 0.95 g cm −3 , achieving the balance of the gravimetric and volumetric characteristics. The ZIC also presents a maximum volumetric power density of 21.2 kW L -1 at 7.9 Wh L -1 and 96.4% capacity retention after 8000 cycles, revealing excellent compact energy storage and cyclability. Moreover, the soft-package ZIC devices present admirable scalability, further exposing the application potential of the compact graphene film in the ZIC field.
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IONICS
·
2023
·
IF 2.8
Wang Peng,Zhu Xinxin,Ding Yihong,Shao Lixiong,Jin Huile,Zhang Lichen,Wang Xintong,Zeng Tianbiao
As a new type of negative electrode material for SIBs, (iron germanium sulfide) Fe 2 GeS 4 is considered a highly promising negative electrode material for SIBs owing to its high theoretical capacity, fast Na + diffusion kinetics, and good thermal stability. In practical applications, it is crucial to synthesize the high-capacity/reversible nanostructured Fe 2 GeS 4 -based negative electrodes through an easily executable method. In this study, a two-step synthesis method to prepare nanostructured Fe 2 GeS 4 anchored on graphite (Fe 2 GeS 4 /G-15%) was employed: the commercial FeS, S, and Ge powders were mixed and heated, and then graphite was added for ball milling. X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations revealed that there is a strong interaction between the nanostructured Fe 2 GeS 4 powder and the exfoliated graphite, forming a highly stable nanocomposite material, which is beneficial for improving the reversible charge-discharge performance of the material. When used as a negative electrode material for SIBs, the prepared Fe 2 GeS 4 /G-15% exhibited a capacity of 665.5 mAh g −1 during the second cycle at 0.1 A g −1 and could maintain a capacity of 519 mAh g −1 even after the 60th cycle. Considering the simple synthesis process employed in this study, it provides a reference for the production of high-performance Fe 2 GeS 4 -based negative electrode materials for SIBs. Graphical abstract
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Small
·
2023
·
IF 13.3
Sijia Zheng,Haiyan Xue,Ying Liu,Xing Yu,Zhihai Cao
Thermal interface materials (TIMs) are in desperate desire with the development of the modern electronic industry. An excellent TIM needs desired comprehensive properties including but not limited to high thermal conductivity, low Yong's modulus, lightweight, as well as low price. However, as is typically the case, those properties are naturally contradictory. To tackle such dilemmas, a strategy of construction high-performance TIM inspired by alveoli is proposed. The material design includes the self-alignment of graphite into 3D interconnected thermally conductive networks by polydimethylsiloxane beads (PBs) -the alveoli; and a small amount of liquid metal (LM) – capillary networks bridging the PBs and graphite network. Through the delicate structural regulation and the synergistic effect of the LM and solid graphite filler, superb thermal conductivity (9.98 ± 0.34 W m −1 K −1 ) can be achieved. The light emitting diode (LED) application and their performance in the central processing unit (CPU) heat dispersion manifest the TIM developed in the work has stable thermal conductivity for long-term applications. The thermally conductive, soft, and lightweight composites are believed to be high-performance silicone bases TIMs for advanced electronics.
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PubMed
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Tingting Zhu,Jinhang Yang,Yuxiang Shen,Ting Liang,Songyu Fan,Shiming Zhang,Zebin Yu,Shuangfei Wang,Yanping Hou
Z-scheme heterojunction photocatalysts can restrain carriers’ recombination while retaining high redox capacity. Herein, a novel ZnTe/rGO/WO 3 (ZRW) Z-scheme heterojunction was constructed for simultaneous removal of TC and Cu (II) from wastewater. The highly conductive rGO served as a bridge connecting the ZnTe and WO 3 whereby forming a tight interaction interface, beneficial to carriers transfer and separation. The removals of TC and Cu (II) using the optimized ZRW-10% achieved 90.6% and 89.5% within 150 min of light exposure, which were much higher than those from the ZnTe and WO 3 . Results of free radical trapping experiments and electron spin resonance analysis suggested that·O 2 - and·OH were the key active species for TC oxidation while e - dominated Cu (II) reduction. Based on the identified TC degradation intermediates, two possible degradation pathways for TC were proposed, and the ecotoxicity of most intermediates were less than TC. This study can advance research development of designing efficient Z-scheme photocatalyst and elimination of complex pollutants.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Yanbing Sun,Huimin He,Dezhou Zheng,Fuxin Wang,Fanyuan Meng,Wei Xu,Gang Huang,Jing Zhao,Daize Mo,Mark C. Wiliiams,Qi Feng
Recently, ruthenium telluride (RuTe 2 ) has received widespread attention as an effective HER catalyst. In this work, ultrafine and well-dispersed RuTe 2 nanoparticles anchored on nitrogen and boron co-doped graphene (RuTe 2 /BNG) was developed by freeze-drying and facile pyrolysis method, demonstrating a brilliant HER performance. The overpotential of RuTe 2 /BNG at the current density of 10 mA cm −2 is only 34 and 16 mV in 0.5 M H 2 SO 4 and 1.0 M KOH solution, respectively. More importantly, the RuTe 2 /BNG can also maintain significantly robust HER stability during long-term chronopotentiometry measurements. The outstanding HER activity of RuTe 2 /BNG should be ascribed to its properties with abundant defects, large specific surface area, high electronic conductivity and short mass transfer path. Our work offers a new path to fabricate efficient HER catalysts by homogeneously anchoring RuTe 2 on B, N co-doped graphene.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Jibao Deng,Hefei Wang,Yan Su,Ke Shen,Xuwen Chen,Xian Zhou,Xiaojie Hu,Yanzheng Gao
Microwave irradiation is a promising technology for the remediation of soil contaminated by organic contaminants . However, the roles of volatilization and decomposition in microwave removal of polycyclic aromatic hydrocarbons (PAHs) in soil have not yet been quantitatively determined. A model describing the removal efficiency of benz(a)anthracene (BaA) at different treatment times and varied conditions was constructed, wherein BaA removal efficiency was positively and linearly correlated with soil temperature . BaA removal in soil was attributed to thermal volatilization (97.8%) and decomposition (2.2%). Radicals such as ∙OH and ∙O 2 − were found to initiate BaA decomposition, the pathway of which was elucidated through HPLC-MS analysis, revealing benz(a)anthracene-7,12-dione as the main intermediate product. The new ideas and perspectives founded in this study offer theoretical support for microwave remediation of organic compound–contaminated sites.
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PubMed
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EUROPEAN POLYMER JOURNAL
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2023
·
IF 6
Zhifu Guan,Sihong Wang,Ziqi Deng,Biyao Jin,Lianhua Zhao
Nano octa-aminopropyl polyhedral oligomeric silsesquioxane (OA-POSS) was grafted into graphene oxide (GO) via covalent bonding to synthesize OA-POSS-g-GO. A novel SP/OA-POSS-g-GO proton exchange membrane was prepared by adding sulfonated poly (ether ether ketone) (SPEEK, SP). OA-POSS was well dispersed on GO to form an ordered acid-base pair with SPEEK, which facilitated the construction of continuous ion channels. GO as a carrier facilitated the construction of long-range proton conduction pathways in the membrane. The strong interactions between OA-POSS and SPEEK along with the synergistic effect of GO modulate the size of ionic clusters and increased the bound water ratio within the membrane. The conductivity of the SP/OA-POSS-g-GO-2 membrane (80 °C, 95% RH) reached 0.2096 S⋅cm −1 , which was 1.7 times higher than that of the SPEEK membrane (0.1265 S⋅cm −1 ). The conductivity of the SP/OA-POSS-g-GO-2 membrane increased at 100 °C and 40% RH, while that of the SPEEK membrane decreased with the temperature increased above 80 °C. The maximum power density of the single cell assembled from the composite membrane reached 305.8 mW⋅cm −2 at 80 °C and 95% RH, which was 1.4 and 1.3 times higher than that of the SPEEK and Nafion 117 membrane, respectively.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Xin Xiang,Wenxuan Deng,Zhiyi He,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jianmei Lu
In recent years, oil spills and the discharge of industrial organic wastewater have not only damaged society and the economy, but also have had a negative impact on the human environment. The composition of oily wastewater is complex and hazardous. It mainly comprises insoluble organic substances and unsaturated aliphatic hydrocarbons. It exists in the form of oil–water mixtures, freely suspended emulsions, and stable emulsions containing surfactants. The shortage of fresh water resources and how to effectively separate oil and water present serious challenges to the scientific community. In this study, we designed a graphene aerogel with magnetic oil-absorbing functionality, which not only has emulsion-breaking functionality, but also can repeatedly adsorb organic pollutants . More importantly, it exhibits a strong Fenton catalytic effect and can effectively degrade pollutants. The aerogel designed in this research integrates adsorption, catalysis and degradation, and exhibits excellent purification of wastewater containing pollutants such as dyes, antibiotics and aromatic hydrocarbons , providing a novel insight into the treatment of oily wastewater.
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POLYMER TESTING
·
2023
·
IF 5.1
Hua Xin,Yue Chen,Xinqi Li,Yangfan Li,Qi Peng,Hao Luo
A new inorganic flame retardant P/N-GO was prepared by chemically modifying graphene oxide (GO) with phosphorus trichloride (POCl 3 ) and 4,4-diamino-diphenylmethane (DDM). The P/N-GO was covalently grafted into a phosphorus-containing aqueous polyurethane (PWPU) system to prepare a flame-retardant nanocomposite (P/N-GO/PWPU). Due to the uniform distribution of P/N-GO in the polymer matrix, a strong interfacial adhesion can be formed and the mechanical properties of the WPU can be significantly improved. The mechanical strength of the composites increased from 4.56 MPa to 9.16 MPa. The LOI value of WPU increased from 25.5% to 30.5%, indicating that its flame-retardant properties were improved and met the standards for flame-retardant materials. At the same time, the peak heat release rate (PHRR) was reduced from 184.374 kW/m 2 to 116.730 kW/m 2 , which showed good flame retardant properties of P/N-GO/PWPU and was favourable for expanding the application scope and safe use of WPU.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 42
·19688-19697
·
IF 3.3
Yang Zou,Xue Li,Siqi Hu,Yumeng Wen,Xiaolong Liu,Chunxin Lu,Tingyu Zhu
Four types of Pt/C catalysts were synthesized by depositing platinum on various carbon materials, including graphene, graphitic carbon nitride, activated carbon, and carbon nanotubes. The microscopic structure and physicochemical properties of these catalysts were analyzed using different techniques such as TEM, XRD, BET, TGA, and XPS. The results indicated that platinum predominantly existed in the form of nanoparticles on graphene, graphitic carbon nitride, and carbon nanotubes. The performance of the catalysts in catalyzing CO oxidation was evaluated, and Pt/CNTs exhibited the highest efficiency compared to other catalysts. At a temperature of 170 °C, the conversion efficiency of CO on Pt/CNTs reached 96.5%. In situ DRIFTS experiments were performed, which did not show any peaks of CO adsorption on the surface of Pt/CNTs. Therefore, the oxidation of CO on Pt/CNTs was presumed to proceed via the Eley–Rideal (ER) mechanism. O2 was adsorbed and activated on Pt NPs to form a Pt NP–O–O*–CO structure with CO, which then decomposed to yield CO2 and an activated oxygen species (O*). Finally, O* reacted with CO again to produce CO2, completing the catalytic cycle.
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