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亚铁氰化铜 1

聚偏氟乙烯 1

膜改性 1

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Cesium removal from radioactive wastewater by adsorption and membrane technology

《环境科学与工程前沿（英文）》 2023年第18卷第3期 doi: 10.1007/s11783-024-1798-1

摘要：

● Removal of cesium from radioactive wastewater is still a challenging.

关键词： Cesium Adsorption Membrane separation Advanced liquid processing system Fukushima nuclear accident

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Long-lasting photoluminescence quantum yield of cesium lead halide perovskite-type quantum dots

Yonghyun Kim, Huiwen Liu, Yi Liu, Boa Jin, Hao Zhang, Wenjing Tian, Chan Im

《化学科学与工程前沿（英文）》 2021年第15卷第1期页码 187-197 doi: 10.1007/s11705-020-1931-z

摘要： Cesium lead halide perovskite (CsPbX , X= Cl, Br, I) quantum dots (QDs) and their partly Mn -substituted QDs (CsPb Mn X ) attract considerable attention owing to their unique photoluminescence (PL) efficiencies. The two types of QDs, having different PL decay dynamics, needed to be further investigated in a form of aggregates to understand their solid-state-induced exciton dynamics in conjunction with their behaviors upon degradation to achieve practical applications of those promising QDs. However, thus far, these QDs have not been sufficiently investigated to obtain deep insights related to the long-term stability of their PL properties as aggregated solid-states. Therefore, in this study, we comparatively examined CsPbX - and CsPb Mn X -type QDs stocked for>50 d under dark ambient conditions by using excitation wavelength-dependent PL quantum yield and time-resolved PL spectroscopy. These investigations were performed with powder samples in addition to solutions to determine the influence of the inter-QD interaction of the aged QD aggregates on their radiative decays. It turns out that the Mn -substituted QDs exhibited long-lasting PL quantum efficiencies, while the unsubstituted CsPbX -type QDs exhibited a drastic reduction of their PL efficiencies. And the obtained PL traces were clearly sensitive to the sample status. This is discussed with the possible interaction depending on the size and distance of the QD aggregates.

关键词： quantum dots cesium lead halide perovskite time-resolved photoluminescence PL quantum yield QD aggregates

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高效选择性PVDF中空纤维膜设计及除铯研究 Article

丁士元, 张利兰, 李阳, 候立安

《工程（英文）》 2019年第5卷第5期页码 865-871 doi: 10.1016/j.eng.2019.07.021

摘要：

本研究通过一种简单有效的接枝方法成功制备了亚铁氰化铜/二氧化硅/聚偏氟乙烯（CuFC/SiO₂/PVDF）中空纤维膜。PVDF中空纤维膜通过SiO₂中间层将CuFC纳米颗粒固定以去除Cs。分别通过扫描电子显微镜和X射线能谱仪分析了改性膜表面形貌和化学组成。3层CuFC和0.5% SiO₂负载制备的CuFC/SiO₂/PVDF膜具有非常高的膜渗透通量（49 L·m^-2·h^-1·bar^-1）和Cs截留率（99.82%），且pH（4~10）的变化对Cs的去除率影响较小。改性膜可以通过NH₄NO₃进行多次有效再生。在1 mmol·L^–1的共存竞争离子（K⁺和Na⁺）影响下，改性膜仍保持较高的除Cs效率（8 h分别为76.25%和88.67%），展现出对Cs的选择去除性。特别地， CuFC/SiO₂/PVDF膜在处理含低浓度Cs（100 μg·L^–1）的天然地表水和模拟水体时表现出非常优异的去除率（>90%）。因此，CuFC/SiO₂/PVDF膜具有处理受Cs污染的放射性废水的工程应用潜力。

关键词：铯去除膜改性亚铁氰化铜聚偏氟乙烯

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Novel method for the preparation of Cs-containing FAU(Y) catalysts for aniline methylation

Olga A. Ponomareva, Polina A. Shaposhnik, Marina V. Belova, Boris A. Kolozhvari, Irina I. Ivanova

《化学科学与工程前沿（英文）》 2018年第12卷第1期页码 70-76 doi: 10.1007/s11705-017-1694-3

摘要： Cs-containing FAU(Y)-type zeolite catalysts were prepared by conventional and novel ion exchange procedures followed by incipient wetness impregnation with CsOH. The novel ion exchange procedure involved hydrothermal treatment of NaY zeolite in aqueous solution of CsCl at 140–200 °C for 6–24 h. The samples were characterized by low-temperature nitrogen adsorption, X-ray fluorescence analysis, X-ray powder diffraction, scanning electron microscopy, Na, Al and Cs magic angle spinning nuclear magnetic resonance, CO and NH -Temperature programmed desorption. The results show that hydrothermal treatment at 200 °C allows to obtain higher degrees of ion-exchange (up to 83%) with respect to conventional method giving maximum 66%–69%. Catalytic properties of Cs-containing FAU(Y) were studied in aniline methylation. The yield of -methylaniline is shown to correlate with catalyst’s basicity. The best catalyst performance was achieved over the catalyst with the highest ion-exchange degree impregnated with CsOH. The selectivity to -methylaniline over this catalyst reached 96.4%.

关键词： FAU(Y) zeolite ion exchange with cesium aniline alkylation N-methylaniline