Nuclear Engineering and Technology
·
2017
·
IF 1.144
Shuting Zhuang,Yanan Yin,Jianlong Wang
Chitosan was modified by gamma radiation–induced grafting with maleic acid and then used for the removal of cobalt ions from aqueous solutions. Chitosan-g-maleic acid was characterized by Fourier Transform infrared spectroscopy (FT-IR). The effect of the dose (1–5 kGy) and monomer concentration (0.3–1.3%, m/v) on the grafting ratio was examined. The adsorption kinetics and isotherms were also investigated. The results showed that the optimal dose for grafting was 2 kGy. When monomer concentration was within the range of 0.3–1.3% (m/v), the grafting ratio increased almost linearly. For the adsorption of cobalt ions by chitosan-g-maleic acid beads, the pseudo second-order kinetic model (R 2 = 0.99) and Temkin isotherm model (R 2 = 0.96) were able to fit the experimental data reasonably well. The equilibrium adsorption capacity of cobalt ions increased from 2.00 mg/g to 2.78 mg/g after chitosan modification.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
RADIATION PHYSICS AND CHEMISTRY
·
2024
·
IF 2.8
Qin Wen,Shizong Wang,Jianlong Wang,Hai Chen,Yuedong Zhou
In this study, the degradation and mineralization of 2-chlorobiphenyl (2-PCB) by gamma irradiation were investigated in the presence of persulfate (PS), to examine the synergistic effect of radiation and persulfate oxidation. The results showed that the absorbed dose required for complete removal of 2-PCB decreased in the presence of PS. In addition, compared to a single irradiation system, the removal efficiency and mineralization of 2-PCB in deionized water , groundwater, and secondary effluent increased when irradiation combined with PS. 2-PCB at concentration of 4 mg L −1 to 8 mg L −1 could be efficiently degraded at a wide pH range (3.0–9.5) in irradiation-activated PS (irradiation/PS) system. The presence of 10 mM or 100 mM of Cl − , NO 3 − , CO 3 2− , and SO 4 2− in irradiation/PS system had no obvious influence on 2-PCB removal. 2-PCB was degraded under the combined action of sulfate radicals (SO 4 •− ) and hydroxyl radicals (·OH), in which ·OH contributed more. The irradiation/PS system is promising to treat PCB-containing wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RADIATION PHYSICS AND CHEMISTRY
·
2025
·
IF 3.3
Jinfeng Li,Nan Zhang,Qianwen Wang,Jianwei Zhang,Bo Tian,Zhigang Li,Haifeng Gu,Hongtao Zhao
The research for highly removal of uranium from nuclear waste is of significance for radionuclide remediation and environment. Herein, a robust pyrazolate-based metal-organic framework (NiBTP) is prepared by γ-irradiation through complexation between 1,3,5-tris(1H-pyrazol-4-yl) benzene (H 3 BTP) and Nickel (II) and presents efficient U(VI) adsorption performance. The synthesized NiBTP is characterized by XRD, FTIR, SEM, TEM, XPS and N 2 adsorption–desorption isotherm analysis. Structural characterizations demonstrate that NiBTP prepared by γ-irradiation possesses decreased BET surface area with hierarchical pore structure, but also has excellent crystallinity and high chemical stability. Batch experiments reveal that NiBTP adsorbent displays high adsorption capacity of uranium and excellent selectivity for UO 2 2+ ion in the presence of competing K + , Cs + , Sr + , Co 2+ , Mg 2+ , Ca 2+ , La 3+ and Eu 3+ ions. Thermodynamic investigation shows the adsorption process is endothermic and spontaneous. In addition, the adsorption mechanism of UO 2 2+ ion onto NiBTP is attributed to the hierarchical pore architecture as well as complexation. This study presents a simpler and more efficient alternative method for the preparation of pyrazolate MOFs and highlights the power of robust pyrazolate MOFs in sequestrations of radioactive pollutants from water environment.
研究领域:
材料科学
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环境科学
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放射化学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2016
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IF 4.219
Qianhong Gao,Jiangtao Hu,Rong Li,Lijuan Pang,Zhe Xing,Lu Xu,Mouhua Wang,Xiaojing Guo,Guozhong Wu
A new kind of non-fluorine-based organic-inorganic hybrid superhydrophobic cotton fabric was successfully prepared by simultaneous radiation-induced graft polymerization of γ-methacryloxypropyl trimethoxy silane (MAPS) and subsequent end-capping modification with hexamethyldisilazane (HMDS). The chemical structure and surface topography of the pristine and modified cotton fabrics were investigated in detail by ATR-FTIR, XPS, 29 Si NMR, SEM and TGA to confirm that the graft reaction and end-capping modification had taken place. The above results demonstrated that the grafting polymerization and following end-capping reaction were completed, and a grafting layer was immobilized onto the surface of the cotton fabric. Surface wettability measurement and oil-water separation showed that the modified cotton surface not only exhibited the superhydrophobicity with a water contact angle of 165°, but also afforded a high efficiency of oil-water separation (96%). In particular, this modified cotton fabric retains superhydrophobicity even after 30 laundering cycles or 400 cycles of abrasion.
研究领域:
材料科学
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纺织工程
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表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Qiang Liu,Wei Huang,Bo Liu,Pu-cheng Wang,Hong-bing Chen
Gamma radiolysis behaviors and mechanisms of silica-filled o-cresol formaldehyde epoxy are studied at 2.20 × 10–5 to 1.95 × 10–1 Gy/s. The radiolysis-induced changes in chemical structures do not severely affect its thermostability. The slightly deteriorated mechanical strength at temperature exceeding 100 °C is accompanied by the declining glass transition temperature (from 185.9 to 172.2 °C) and enhanced damping ability. The gas yields of hydrogen, methane, and carbon dioxide manifest a remarkable dose rate effect. Based on the Schwarzschild law, their yields at an extremely low dose rate are accurately predicted by the established master curves. Besides, the latent radiolysis of gas products and postradiation effect are found with caution. The radiation-caused residual spin species are proved to be composed of silica defects and a phenoxy-type free radical with a tert-butyl group, according to the experimental results, theoretical calculations, and spectra simulations. The lower vertical ionization potential (7.6 eV) and adiabatic ionization potential (7.1 eV) are primarily due to the ionization of the benzene ring moiety with the tert-butyl group, which is likely to suffer from radiolysis. The calculated bond dissociation energy (260.8–563.5 kJ/mol) of the typical chemical bonds of epoxy is consistent with its radiolytic vulnerability and degradation mechanisms.
研究领域:
材料科学
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辐射化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
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IF 8.5
Bo Tian,Yuanjie Sun,Na Zhou,Zhigang Li,Jinfeng Li,Nan Zhang,Hongtao Zhao
Under the global impact of the COVID-19 pandemic, the demand for melt-blown polypropylene (PP), a crucial material in the manufacture of protective equipment, has seen a significant surge. During the melt-blowing process, PP melts exhibit a sharp decline in viscosity and exhibit poor thermal aging properties. In this study, melt-blown PP composites were prepared through radiation and melt blending techniques. By adjusting the proportions of the constituents, an investigation was conducted into the melt flow rate, FTIR spectra, rheological behavior, crystallization characteristics, surface morphology, surface charge, dielectric properties, and aging properties of these composites. The melt flow rate analysis revealed that the irradiated composites meet the melt-blowing standard of 1500 cm 3 /10 min. Infrared analysis shows that the chemical crosslinking network is formed by oxidative degradation-grafting reaction in melt-blown PP modification. Rheological studies demonstrated that flake graphite - lignin (GNP-LS) interactions promote heterogeneous network formation in composites. Four models-phase angle versus complex modulus, complex viscosity versus complex modulus, Han's plot, and Cole-Cole plot-provided evidence that the melt structure of PP undergoes a ‘liquid-to-solid’ transition. Differential scanning calorimetry (DSC) results indicated that flake graphite exhibits heterogeneous nucleation effects. Scanning electron microscopy (SEM) and transmission electron microscope(TEM) analysis showed that the interaction between flake graphite and lignin enhances the compatibility of the blend system. Zeta potential and dielectric properties tests show that the electrochemical environmental adaptability of melt-blown PP can be controlled by the gradient addition of lignin and flake graphite. Additionally, a large number of hindered phenol structures in GNP and LS enhance aging resistance. Thermogravimetric analysis (TG) indicated that GNP increased PP's heat resistance. Oxidation induction analysis further demonstrated that the oxidation induction time can reach 99.29 min upon the addition of flake graphite.
研究领域:
高分子材料科学
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辐射化学
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功能材料
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聚合物加工
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介电材料
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热分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULAR & MOLECULAR BIOLOGY LETTERS
·
2023
·Vol. 28
·期 1
·1-23
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IF 8.3
Adzraku Seyram Yao,Wang Guozhang,Cao Can,Bao Yurong,Wang Yizhou,Smith Alhaji Osman,Du Yuwei,Wang Haiyang,Li Yue,Xu Kailin,Qiao Jianlin,Ju Wen,Zeng Lingyu
Background Hematopoietic stem cell transplantation involves irradiation preconditioning which causes bone marrow endothelial cell dysfunction. While much emphasis is on the reconstitution of hematopoietic stem cells in the bone marrow microenvironment, endothelial cell preservation is indispensable to overcome the preconditioning damages. This study aims to ascertain the role of Roundabout 4 (Robo4) in regulating irradiation-induced damage to the endothelium.Methods Microvascular endothelial cells were treated with γ-radiation to establish an endothelial cell injury model. Robo4 expression in the endothelial cells was manipulated employing lentiviral-mediated RNAi and gene overexpression technology before irradiation treatment. The permeability of endothelial cells was measured using qPCR, immunocytochemistry, and immunoblotting to analyze the effect on the expression and distribution of junctional molecules, adherens junctions, tight junctions, and gap junctions. Using Transwell endothelial monolayer staining, FITC-Dextran permeability, and gap junction-mediated intercellular communication (GJIC) assays, we determined the changes in endothelial functions after Robo4 gene manipulation and irradiation. Moreover, we measured the proportion of CD31 expression in endothelial cells by flow cytometry. We analyzed variations between two or multiple groups using Student’s t-tests and ANOVA.Results Ionizing radiation upregulates Robo4 expression but disrupts endothelial junctional molecules. Robo4 deletion causes further degradation of endothelial junctions hence increasing the permeability of the endothelial cell monolayer. Robo4 knockdown in microvascular endothelial cells increases the degradation and delocalization of ZO-1, PECAM-1, occludin, and claudin-5 molecules after irradiation. Conversely, connexin 43 expression increases after silencing Robo4 in endothelial cells to induce permeability but are readily destroyed when exposed to 10 Gy of gamma radiation. Also, Robo4 knockdown enhances Y731-VE-cadherin phosphorylation leading to the depletion and destabilization of VE-cadherin at the endothelial junctions following irradiation. However, Robo4 overexpression mitigates irradiation-induced degradation of tight junctional proteins and stabilizes claudin-5 and ZO-1 distribution. Finally, the enhanced expression of Robo4 ameliorates the irradiation-induced depletion of VE-cadherin and connexin 43, improves the integrity of microvascular endothelial cell junctions, and decreases permeability.Conclusion This study reveals that Robo4 maintains microvascular integrity after radiation preconditioning treatment by regulating endothelial permeability and protecting endothelial functions. Our results also provided a potential mechanism to repair the bone marrow vascular niche after irradiation by modulating Robo4 expression.
研究领域:
细胞生物学
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放射生物学
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血液学
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分子生物学
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产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Hang Shen,Zhihao Wu,Ruiyang Dou,Limin Jiao,Geng Chen,Mingzhang Lin,Wei Huang,Qiang Liu,Hongbing Chen
The developing nuclear technology has increased the need for radiation-resistant and shielding materials. It is crucial to study the radiation resistance of polymers in order to prevent safety incidents brought on by the degradation of polymer performance in a nuclear environment. In this work, γ-aminopropyltriethoxy silane (KH550) was successfully grafted onto carbon-doped boron (BCN) to obtain modified BCN (BCN-KH550), then BCN-KH550 was added in silicone rubber and refined and vulcanized. The elongation at break of silicone rubber composite doped with 0.3 phr BCN-KH550 can retain (54 ± 2)% of the initial value. The addition of BCN and BCN-KH550 both increases the initial decomposition temperature of the irradiated SR. The radiation caused changes in crystallinity and glass transition temperature (T g ) were measured using differential scanning calorimetry. The difference T g of BCN-KH550/SR0.3 before and after irradiation is 0.9 °C higher than that of SR. It is supposed that BCN protects the side group of SR during irradiation through differential thermogravimetric analysis curve and gas phase infrared spectra of the irradiation-induced gas products. BCN and BCN-KH550 can lower the hydrocarbon, CO 2 and CO production by side chain breakdown in both air and nitrogen atmospheres. The presence of BCN and BCN-KH550 decrease the radiation crosslinking of SR. The outcomes demonstrate that BCN-KH550 can reduce the effects of γ-radiation crosslinking on SR by declining side chain decomposition.
研究领域:
材料科学
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核工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）