PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
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IF 6.9
Hao Liang,Nana Wang,Wei Tian,Hongping Zhang,Cuicui Li,Ruibin Guo,Zunli Mo,Nijuan Liu
Uranium extraction from unconventional uranium resources is among the major constraints to the development of the nuclear industry at present. In this dissertation, we here propose to effectively graft amidoxime groups on magnetic MXene and chitosan (CS) composites to extract uranium from low-enriched uranium solutions (MCF-AO). The data of adsorption experiments displayed that MCF-AO possessed fast adsorption kinetics (within 120 min), outstanding selectivity and salient adsorption capacity (1305.7 mg/g at pH=4, T=298.15 K) for uranium and could be easily separated with a magnet. Adsorption studies revealed a behavior consistent with the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model, which is suitable for the spontaneous heat-absorption chemical monolayer adsorption process . Its sorption remains at more than 55 % of the original after 5 adsorption-desorption tests, and has great tolerance to interfering ions. Mechanistic research pointed out that the selective adsorption of uranium by MCF-AO was significantly enhanced by the presence of hydroxyl, amino and amidoxime groups. Meanwhile, MCF-AO exhibited superb resistance to two common bacteria (E. coli and B. subtilis ) and achieved more than 95 % uranium extraction capacity in simulated seawater , even more 4.12 mg/g of uranium extraction in Salt Lake water. Consequently, MCF-AO has a broad application prospect in the recovery and treatment of complex uranium systems.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Kai Hu,Xiaobing Liu,Huifen Ma,Di Zhao,Junying Song,Huahui Zeng,Zhenqiang Zhang
A magnetic MXene aerogel (Fe 3 O 4 @MXene@PEI) was prepared by crosslinking amino modified MXene with polyethyleneimine using epichlorohydrin as a cross-linker. Adsorption properties of Fe 3 O 4 @MXene@PEI aerogel for phenolic acids were evaluated by adsorption kinetics and isotherms experiments, showing that the high adsorption affinity was governed by multilayer chemisorption process. An efficient MSPE/HPLC method was developed for the determination of phenolic acids with excellent selectivity, good linearity (0.025–5.0 μg mL −1 ), low LODs (0.007–0.017 μg mL −1 ), and satisfactory recoveries (80.0–120.0 %). Moreover, the antioxidant activity of the Fe 3 O 4 @MXene@PEI purified compounds was superior to that of the conventional method as demonstrated by the results of scavenging experiments on 2,2 -diphenyl-1-picrylhydrazyl radical scavenging assay. Finally, 65 organic acids were identified in the Fe 3 O 4 @MXene@PEI treated honeysuckle extracts by UHPLC-Q-Exactive Orbitrap MS/MS analysis. The proposed sorbent exhibits remarkable promise for the selective separation and purification of organic acids from herbal products.
研究领域:
分析化学
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植物化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Yang Zhou,Jiahao Sun,Zhaoyang Li,Bing Zhou,Chuntai Liu,Yuezhan Feng
The integral structure design is equally crucial to the regulation of electromagnetic components in microwave absorbing materials. In this work, magnetic MXene/polyvinylidene fluoride composites with integral nacre-like structure were prepared by successive hot-pressing process to realize the layered arrangement of Ni anchored MXene (Ni@MXene). The order degree of Ni@MXene from random to orientation can be adjusted by gradually changing compression ratio. Interestingly, increasing the orientation degree of Ni@MXene effectively improves the dielectric constant, minimal reflection loss ( RL min ) and effective absorption bandwidth (EAB) of the layered composites. This is attributed to the improved loss ability by increasing the contact areas between Ni@MXene and vertically incident electromagnetic waves , inducing multiple scattering/reflection effect, and the formation of localized conductive pathways. As a result, the layered composite with optimal layered structure delivers the best electromagnetic microwave absorption performance with a RL min of −69.8 dB and an EAB of 4.77 GHz. Besides, increasing the orientation degree can also optimize the mechanical properties of the layered composites, with the maximum tensile strength and toughness of 32.6 MPa and 115.0 MJ m −3 , respectively. Therefore, this work proves the adjustability of absorption performance by changing the distribution of absorbents, and integrates the structure and function for microwave absorption materials .
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Wenjuan Zhang,Qiaohong Zhang,Xiangyue Yang,Mengyu Ran,Yezhi Ding,Peiqing La
Conventional homogeneous catalysts for photo-Fenton reactions suffer from inherent drawbacks, including difficult recovery, poor stability, and rate-limiting steps, which significantly restrict their practical application. To overcome these challenges, a novel photo-Fenton catalytic support, MXene–porous polydopamine (MPP), was fabricated via an interfacial co-assembly strategy. Subsequently, nano zero-valent iron (Fe) was anchored onto the MPP framework to construct a magnetic MXene–porous polydopamine (Fe/MPP) catalyst. The unique multi-interfacial porous structure of Fe/MPP facilitates efficient mass and electron transport, while the synergistic effects of Fe redox cycling and phenol–quinone conversion under light irradiation enhance the Fe 3+ /Fe 2+ regeneration process. As a result, Fe/MPP achieved outstanding photo-Fenton degradation performance, removing 99.89 % of methylene blue (MB, 4 g/L) within 30 min, surpassing most previously reported homogeneous catalysts. Moreover, Fe/MPP exhibits excellent reusability, maintaining over 53 % degradation efficiency after ten consecutive cycles. These results demonstrate that Fe/MPP exhibits high photo-Fenton activity and cycling stability, showing promising potential for practical wastewater treatment applications.
✓ 已验证
产品关联
DOI
高影响因子
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