SEPARATION AND PURIFICATION TECHNOLOGY
·
2017
·
IF 3.359
Cheng Tan,Lei Li,Kongzhai Li,Dapeng Zhong
A novel method to separate As from high As-Sb dust using Fe 2 O 3 as a fixative under an O 2 -N 2 atmosphere is proposed. Here, Sb is oxidised and converted to Sb 2 O 4 and FeSbO 4 that remain in the roasted residue, and As is volatilized in the form of As 4 O 6 . The Sb 2 O 3 can be selectively oxidised from the dust by using 21 vol% O 2 , but the formation of amorphous substance (As-Sb-O) hinders the effective separation of As and Sb. Adding Fe 2 O 3 hinders the amorphous substance formation and destroys the structure of the solid solution ((Sb, As) 2 O 3 ) in the raw material by converting the Sb component in it to FeSbO 4 . Therefore, the volatilization rates of As and Sb can reach up to 90.53% and only 13.20%, respectively at a roasting temperature of 723 K, roasting time of 90 min, an Fe 2 O 3 dosage of 15 mass%, and O 2 content of 21 vol%.
研究领域:
冶金学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 23
·2200548
·
IF 15.153
Meng-Meng Pan,Yu Ouyang,Yong-Li Song,Lu-Qin Si,Ming Jiang,Xu Yu,Li Xu,Itamar Willner
The synthesis and characterization of Au 3+ -modified UiO-67 metal-organic framework nanoparticles, Au 3+ -NMOFs, are described. The Au 3+ -NMOFs reveal dual oxidase-like and peroxidase-like activities and act as an active catalyst for the catalyzed generation of O 2 •− under aerobic conditions or •OH in the presence of H 2 O 2 . The two reactive oxygen species (ROS) agents O 2 •− and •OH are cooperatively formed by Au 3+ -NMOFs under aerobic conditions, and in the presence of H 2 O 2. The Au 3+ -NMOFs are applied as an effective catalyst for the generation ROS agents for antibacterial and wound healing applications. Effective antibacterial cell death and inhibition of cell proliferation of Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E . coli ) bacterial colonies are demonstrated in the presence of the Au 3+ -NMOFs. In addition, in vivo experiments demonstrate effective wound healing of mice wounds infected by S. aureus , treated by the Au 3+ -NMOFs.
研究领域:
材料科学
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生物医学工程
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qian Wang,Weiwang Qiu,Mengna Li,Na Li,Xiaoran Li,Xiaohong Qin,Xueli Wang,Jianyong Yu,Faxue Li,Liqian Huang,Dequn Wu
Diabetic wound treatment remains a major challenge due to the difficulties of eliminating bacterial biofilm and relieving wound hypoxia . To address these issues simultaneously, a multifunctional Dex-SA-AEMA/MnO 2 /PDA (DSAMP) hydrogel platform was developed with excellent biocompatibility and porous structure. The hydrogel could absorb the exudate, maintain humidity and permeate oxygen, which was prepared by encapsulating polydopamine (PDA) and manganese dioxide (MnO 2 ) into Dex-SA-AEMA (DSA) hydrogel by UV irradiation . With the addition of PDA , the DSAMP hydrogel was proved to eliminate the biofilm after NIR photodynamic therapy (PTT, 808 nm) irradiation at 54 °C. Furthermore, in order to mitigate hypoxia wound microenvironment, MnO 2 nanoparticles were added to convert the endogenous hydrogen peroxide (H 2 O 2 ) into oxygen (O 2 , 16 mg L −1 ). The diabetic wound in vivo treated by DSAMP hydrogel was completely healed on 14 days. It was revealed that the DSAMP hydrogel possessed a great potential as dressing for diabetic chronic wound healing.
研究领域:
生物医学工程
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伤口愈合研究
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纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Shuangping Xu,Wenqiang Ma,Hailiang Zhou,Yushu Zhang,Hongge Jia,Jingyu Xu,Pengfei Jiang,Xintian Wang,Wenwen Zhao
The synthesis of poly(methyhydrosiloxane) (PMHS) and N,N′-bis(3-allyl)pyromellitic diimide was optimized for O2/N2 separation. The membrane exhibits excellent mechanical and thermal properties and shows an O2/N2 selectivity of up to 4.44 with an O2 permeability of 31.0 Barrer; compared with polydimethylsiloxane (PDMS) and pure polyimide (PI) membranes, the separation selectivity shows a 107% increase for PDMS, and the permeation shows a 660% increase for pure PI. The obtained results were well above the ones reported on the literature for similar conditions opening the door for the preparation of a stable polysiloxane (PMHS-I) gas separation membrane with extraordinary O2/N2 separation performance.
研究领域:
材料科学
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化学工程
·
膜技术
·
气体分离
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOELECTROCHEMISTRY
·
2022
·
IF 5.76
Yanjing Yun,Zhisong Lu,Xiaodan Jiao,Peng Xue,Wei Sun,Yan Qiao,Yang Liu
Relationship between mycotoxin-induced hormesis and reactive oxygen species (ROS) has not been systematically investigated due to the lack of an effective analysis method. To monitor cellular release and intracellular level of O 2 ·− , carboxymethyl cellulose-Mn 3 (PO 4 ) 2 nanocomposite was synthesized to fabricate an electrochemical biosensor, which selectively detects O 2 ·− over the range of 57.50 nM ∼ 2.95 μM (R 2 = 0.99) with the sensitivity of 78.67 μA μM −1 cm −2 and the detection limit of 8.47 nM. Transient exposure to zearalenone (ZEA) induces the enhancement on cell viability, immediate O 2 ·− release from cells, and reduction of intracellular O 2 ·− level. After post-treatment culture, intracellular O 2 ·− initially increases to a high level and then decreases to the normal level. Concurrently, the ZEA-induced hormesis disappears. Based on the findings, we propose a mechanism, involving the ROS release, increase of succinate dehydrogenase activity and recovery of intracellular ROS, to explain the occurrence and disappearance of hormesis in intestinal porcine enterocytes.
研究领域:
毒理学
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分析化学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wei Zhou,Liang Xie,Yan Wang,Yani Ding,Xiaoxiao Meng,Fei Sun,Jihui Gao,Guangbo Zhao
Large-scale application of H 2 O 2 production through 2-electron oxygen reduction reaction (2eORR) greatly depends on the cost of electrode materials and configuration. In this work, engineered coal-derived oxygen-rich hierarchical activated coke (AC), which is low-cost and highly tunable in porosity and surface chemistry, was used as catalyst to fabricate gas diffusion electrodes (GDEs) for efficient H 2 O 2 production. Results showed that Fenton’s reagents treatment could significantly increase the contents of C O and –COOH on AC, leading to an increased hydrophilicity. However, the higher O contents do not necessarily enhance the selectivity of AC towards 2eORR (i.e., F-5-AC, F-10-AC), especially that F-20-AC exhibited a complete 4e pathway. GDEs were then fabricated with AC and oxidized AC as catalyst, key fabrication parameters including the PTFE binder and AC particle size, and operating parameters such as current intensity, electrolyte pH, and O 2 flow rate were optimized. Up to 747 mg/L H 2 O 2 were generated within 90 min. Results showed that oxidized AC exhibited a decreased H 2 O 2 yield, due to the flooding of GDEs caused by super-hydrophilicity property. Finally, DFT calculations were employed to reveal the synergistic effect of different O groups considering the fact of high O contents on AC.
研究领域:
材料科学
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电化学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Chaoyang Sun,Fenglong Xiao,Di Wu,Gang Lian,Deliang Cui,Qilong Wang,Haohai Yu
Rechargeable Li-O 2 batteries show great potential due to their superior high energy density. However, the practical application is still limited by the sluggish kinetics, resulting in poor cycling performance and high overpotentials. Herein, highly dispersed Co nanoparticles embedded into porous N -doped carbon matrix (DCo-NC) with carbon nanotubes is explored through the pyrolysis of a bimetallic leaf-shaped ZnCo-ZIFs. The evaporation of Zn species and porous carbon matrix derived from ZIFs prevents the Co nanoparticles aggregation, exposes more Co-N active sites and provides abundant pores. They facilitate Li + and electron transfer, prevent Co nanoparticles from deactivation and provide enough space for Li 2 O 2 , thereby accelerating oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) kinetics. Accordingly, the Li-O 2 batteries with DCo-NC cathode exhibit reduced overpotential, high discharge capacity (10,490 mA h g −1 at 100 mA g −1 current density) and improved cycling performance (258 cycles at 500 mA g −1 with a limited capacity of 500 mA h g −1 , 103 cycles at 500 mA g −1 with a limited capacity of 1000 mA h g −1 ).
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Siyuan Li,Cuiwei Li,Huaiming Jia,Guangjin Chen,Kepi Chen,Linan An
In this paper, a series of (Ce 0.2 Zr 0.2 Ti 0.2 Sn 0.2 Y 0.2- x Ca x )O 2-δ ( x = 0∼0.2) high-entropy of compositionally-complex ceramics were prepared using solid-state reaction method. The results showed that the content of Ca 2+ had significant effects on the phase composition, microstructure and properties of the prepared materials. As Ca 2+ content increased, single-phase fluorite was easier to form. When x ≤ 0.05, materials contained dual-phase of fluorite and pyrochlore structures. When x ≥ 0.075, the prepared materials showed single-phase fluorite structure, which indicated that high-entropy fluorite ceramics (HEFCs) could be prepared under this condition. When Ca 2+ content increased from 0.075 to 0.2, grain size of HEFCs decreased, and relative density decreased from 95.7 % to 78.6 %. Thermal conductivity of these HEFCs varied from 1.87 W m −1 K −1 to 1.60 W m −1 K −1 , which was lower than 8YSZ. As Ca 2+ content increased, both size disorder and mass disorder increased too leading to low thermal conductivity. The results indicate that the prepared HEFCs are promising for thermal insulation applications.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Daming Yang,Guiru Sun,Xinru Wang,Fengyang Li,Ze Gao,Pingli Zhang,Wei Lu,Ming Feng
The photo-assisted lithium-oxygen (Li-O 2 ) cell is widely concerned due to its low overpotential. However, rapid recombination rate of photogenerated electrons and holes remains a fundamental challenge for photo-assisted Li-O 2 cells. Herein, we design an optical and magnetic fields co-assisted Li-O 2 cell based on α-Fe 2 O 3 nanospindles. We employed PL spectrum and I-t curve confirm that under the magnetic field, the photogenerated electrons and holes are driven via the opposite Lorentz forces in photo-assisted Li-O 2 cells, which is beneficial to accelerating the formation and decomposition of Li 2 O 2 . The optical and magnetic fields co-assisted Li-O 2 cell based on α-Fe 2 O 3 nanospindles achieves an ultra-high discharge platform of 3.47 V and a low charge platform of 3.57 V, as well as a surprising energy efficiency of 97.2%. In addition, the optical and magnetic fields co-assisted Li-O 2 cell can stably cycle for over 25 cycles. This study offers a reference for improving the electrochemical kinetics of photo-assisted Li-O 2 cell by introducing magnetic field, which opens up a new avenue for the development of high-performance Li-O 2 cells.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Hongyong Zhao,Ting Song,Xiaoli Ding,Ruyi Cai,Xiaoyao Tan,Yuzhong Zhang
Membrane technology for O 2 /N 2 separation is a mature industrial unit. Membranes with excellent permeation-separation performance are still one of the critical requirements. The cobalt-based compounds have been well known for their good affinity for O 2 , which can facilitate O 2 transfer and improve the O 2 /N 2 selectivity in membranes. The cobalt-based compounds, moreover, have a magnetic responsive effect, which can lead to a further improvement in O 2 /N 2 separation under a magnetic field. A class of PIM-1 mixed matrix membranes (MMMs), containing cobalt-based ionic liquid (CILs)@polyarylate (aromatic polyester) (PAR) (core-shell) composite nanospheres (CILs@PAR (c-s) CNPs), were prepared. Chemical compositions of CILs@PAR (core-shell) CNPs were determined by Fourier transform infrared spectroscopy (FTIR). Morphologies and structures of CILs@PAR (core-shell) CNPs were observed by transmission electron microscopy (TEM). Gas adsorption properties of CILs@PAR (core-shell) CNPs were tested. Thermal properties of the (CILs@PAR (c-s) CNPs)/PIM MMMs were investigated by simultaneous thermal analysis (TGA-DSC). Gas permeation-separation performances of the (CILs@PAR (c-s) CNPs)/PIM MMMs were also reported. Compared with the original PIM-1 membrane, the (CILs@PAR (c-s) CNPs)/PIM MMMs display higher O 2 /N 2 selectivity because of cobalt-based ionic liquid as O 2 carrier, coupled with a reduction in O 2 permeability. With increasing the content of the CILs@PAR (c-s) CNPs, the O 2 /N 2 selectivity increases, and the O 2 permeability decreases. It is also found that, as a magnetic field on the MMMs, the O 2 /N 2 selectivity further increases; and it increases more, as a higher content of CILs@PAR (c-s) CNPs. Therefore, the (CILs@PAR (c-s) CNPs)/PIM MMMs exhibit excellent O 2 /N 2 selectivity of ∼5 coupled with good O 2 permeability of ∼140 Barrer under a 180 mT magnetic field and show great potential for air separation.
研究领域:
材料科学
·
化学工程
·
分离技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 56
·32325-32332
·
IF 2.936
Yuhan Zhu,Yu Pan,Wenjun Wang,Haibing Xu,Liqun Zhou,Xiaoguang Liu,Ling Li
The local crystal sites occupied by Eu3+ in Ca5(BO3)3F:1% Eu3+ phosphor were investigated experimentally and theoretically. Ca5(BO3)3F:1% Eu3+ was synthesized by high-temperature solid-state method in air. The crystal structure and optical properties of the phosphor were studied by X-ray powder diffraction and photoluminescence, respectively. Two different O2− → Eu3+ CT broad bands with the peaks at 266 and 283 nm in Ca5(BO3)3F:1% Eu3+ were detected, indicating the Eu3+ sites occupied Ca2 and Ca1, respectively. The different sharp f–f emission spectra under the excitation of 283 and 266 nm proved that there are two different local lattice environments around Eu3+ existing in Ca5(BO3)3F:1% Eu3+. Environmental factor he, the standard deviation of environmental factor (EFSD) and the bond energy were used to illustrate and explain the site occupancy mechanism of Eu3+ into the host lattice. By comparing the intensity ratios of 5D0 → 7F2 transition to the 5D0 → 7F1 transition, I(5D0/7F2)/I(5D0/7F1) of Eu3+ at Ca2 (7.381) was found to be 2.5 times stronger than that of Eu3+ at Ca1 site (2.933). was calculated to analyze the I(5D0/7F2)/I(5D0/7F1) value. On the basis of the bond valence model, a bond-energy method was used to study the occupancy of the Eu ion, which indicated that the preferential sites of Eu ion occupancy in the Ca5(BO3)3F are the Ca2 and Ca1 sites. All three theoretical calculation results are consistent with each other.
研究领域:
材料科学
·
固体化学
·
光学
·
晶体学
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2025
·
IF 1.6
Zhiqing Liang,Zhongying Liu,Xiuyuan Wei,Hui Wu,Chanjuan Liu,Xiaohua Huang
Bifunctionalized NH2-UiO-66-CF3 nanofillers were successfully prepared by grafting - CF3 on NH2-UiO-66 via aldehyde-amine condensation reaction and applied to the preparation of 6FDA-ODA/NH2-UiO-66-CF3 mixed matrix membranes (MMMs). The successful introduction of -NH2 and -CF3 groups was verified by FT-IR, XRD, and XPS characterization, and the integrity of the crystal structure was ensured. Due to the presence of hydrogen bonding, NH2-UiO-66-CF3 showed good interfacial compatibility with the polymer matrix. Due to the introduction of the - CF3 group, the MMMs exhibited excellent thermal stability (T10% > 500°C, Tg = 300°C–305°C), hydrophobicity (contact angle of 92.96–97.71), and mechanical properties (tensile strength of 74–85 MPa). The gas separation performance tests showed that the MMMs exhibited significantly improved gas permeability and selectivity compared to the pure 6FDA-ODA membranes, which was attributed to the fact that the -NH2 and -CF3 groups provided more adsorption sites for gases. In particular, the PI/NUF(10) MMMs showed the best performance, with permeabilities of 42.71, 9.22, and 92.79 Barrer for CO2, O2, and He, respectively, which were 248%, 213%, and 173% higher than those of the pure membranes. Meanwhile, the selectivities of CO2/N2, O2/N2 and He/N2 were improved by 37%, 24%, and 8%, respectively. Close to the Robeson upper limit, demonstrating excellent gas separation potential.
研究领域:
材料科学
·
化学工程
·
膜技术
·
气体分离
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）