In-situ fabrication of ZIF-8 decorated layered double oxides for adsorption and photocatalytic degradation of methylene blue

Hu, Mengqing; Lou, He; Yan, Xinlong; Hu, Xiaoyan; Feng, Rui; Zhou, Min

doi:10.1016/j.micromeso.2018.05.048

Cited by 85 publications

(14 citation statements)

References 36 publications

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“…ZIFs có các liên kết cấu trúc giống như zeolite, trong đó, các cation kim loại hóa trị hai liên kết phối trí dạng tứ diện với các anion imidazolate [2,3]. ZIFs trở nên thu hút trong những năm gần đây, đặc biệt là các ứng dụng trong lĩnh vực lưu trữ và phân tách khí [4,5], xúc tác [6], cảm biến hóa học [7,8] và dẫn thuốc [9]. ZIF-8 là một trong các vật liệu ZIFs được nghiên cứu nhiều nhất, do có độ bền hóa học và độ bền thủy nhiệt cao.…”

Section: Giới Thiệu Chungunclassified

Evaluation of photocatalytic activities in decomposition of methylene blue in aqueous solution of Mn-ZIF-8 and Mn@Zn

Trung¹,

Dinh²

2021

Vietnam j. catal. adsorp.

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In the present study, manganese modified zeolitic imidazolate framework-8 (Mn-ZIF-8) and zinc-manganese bimetallic oxides (denoted as Mn@Zn), which was formed by Mn-ZIF-8 heat treatment, had been prepared and applied as photocatalysts to decompose methylene blue (MB) under UV radiation. The influence of manganese content on the structure of ZIF-8, as well as the temperature and heat treatment time of Mn-ZIF-8 material to produce Mn@Zn with high photocatalytic activity was investigated. Results showed that all Mn-ZIF-8 samples have photocatalytic activity, but the MB decomposition efficiency of Mn-ZIF-8 samples were lower than pure ZIF-8. The suitable condition for heat treatment of Mn-ZIF-8 to produce Mn@Zn with high photocatalytic activity was at 500 ºC for 5 hours. However, the MB decomposition efficiency of this sample only reached 22% after 180 minutes of UV radiation.

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Section: Giới Thiệu Chungunclassified

Evaluation of photocatalytic activities in decomposition of methylene blue in aqueous solution of Mn-ZIF-8 and Mn@Zn

Trung¹,

Dinh²

2021

Vietnam j. catal. adsorp.

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“…Up to now, different nanoparticles and fluorophores, such as fluorescent dyes (Chin et al 2018;Liu et al 2019;Han et al 2016;Wang et al 2018;Jing et al 2014;Chandra and Nath 2020;Hu et al 2018a), carbon nanomaterials (Wang et al 2019;Li et al 2018b;Wei et al 2019;Wang et al 2021), and quantum dots, have been used for biochemical sensing. (Omer and Hassan 2017;Omer and Sartin 2019;Omer et al 2020;Mohammed and Omer 2020;Omer et al 2020) However, due to aggregationinduced quenching, they suffer from diminishing their luminescence efficiency.…”

Section: Introductionmentioning

confidence: 99%

Designing of robust and sensitive assay via encapsulation of highly emissive and stable blue copper nanocluster into zeolitic imidazole framework (ZIF-8) with quantitative detection of tetracycline

Pirot

Omer

2022

J Anal Sci Technol

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Metal–organic frameworks (MOFs) with high stability and porosity have gained great attention in bioanalysis due to their potential in improving sensitivity and robustness of assays. Herein, to improve both the stability and the emission intensity of Cu nanoclusters (CuNCs), in situ entrapment strategy of CuNCs into zeolitic imidazolate framework-8 (ZIF-8) is described. Blue emissive and stable CuNCs was prepared, for the first time, using thiamine hydrochloride as capping agents, and showed strong and stable emission at 440 nm when excited at 375 nm with fluorescence quantum yields 12%. Encapsulation of CuNC into ZIF-8 showed dramatic enhancement of the fluorescence intensity up to 53% fluorescence quantum yield. Furthermore, the CuNCs@ZIF-8 possesses better stability (more than three months) due to protective and confinement effect of MOFs. Upon the addition of tetracycline to CuNCs@ZIF-8 solution, the blue emission intensity was significantly decreased. The fluorescence ratio (Fo/F) against the concentration of tetracycline exhibited a satisfactory linear relationship from 1.0 to 10.0 µM with a detection limit (LOD) of 0.30 µM. The current probe was applied for quantification of tetracycline in drug sample with satisfactory accuracy and precision. Graphical abstract

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“…Metal–organic frameworks (MOFs [ 1–4 ] ) are a booming class of porous materials with an enormous accessible surface area, often amounting to several thousand square meters per gram. [ 5–7 ] Therefore, MOFs have a high potential for applications such as gas storage, [ 8–10 ] catalysis, [ 11–13 ] and gas separation. [ 14,15 ] They are also used in various functional devices.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Origin of the Particularly Small and Anisotropic Thermal Expansion of MOF‐74

Kamencek

Schrode

Resel

et al. 2022

Advcd Theory and Sims

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Metal-organic frameworks often display large positive or negative thermal expansion coefficients. MOF-74, a material envisioned for many applications, shows a different behavior. Temperature-dependent X-ray diffraction reveals particularly small negative (positive) thermal expansion coefficients perpendicular (parallel) to the hexagonally arranged pores. These trends are explained by combining density-functional theory calculations with the Grüneisen theory of thermal expansion, which allows tracing back thermal expansion to contributions of individual phonons. On the macroscopic level, the small thermal expansion coefficients arise from compensation effects caused by the large coupling between perpendicular stress and strain and by the small magnitudes of the mean Grüneisen tensor elements, 〈𝜸〉. These provide information on how strains impact phonon frequencies. To understand the small value of 〈𝜸〉, the individual mode contributions are analyzed using the corresponding atomic motions. This reveals that only the lowest frequency modes up to ≈3 THz provide non-negligible contributions, such that 〈𝜸〉 drops sharply at higher temperatures. These considerations reveal, how the details of the anharmonic properties of specific phonon bands determine the magnitude and sign of thermal expansion in a prototypical material like MOF-74. Beyond that, the authors also discuss, how the choice of the theoretical methodology impacts the obtained results.

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In-situ fabrication of ZIF-8 decorated layered double oxides for adsorption and photocatalytic degradation of methylene blue

Cited by 85 publications

References 36 publications

Evaluation of photocatalytic activities in decomposition of methylene blue in aqueous solution of Mn-ZIF-8 and Mn@Zn

Evaluation of photocatalytic activities in decomposition of methylene blue in aqueous solution of Mn-ZIF-8 and Mn@Zn

Designing of robust and sensitive assay via encapsulation of highly emissive and stable blue copper nanocluster into zeolitic imidazole framework (ZIF-8) with quantitative detection of tetracycline

Understanding the Origin of the Particularly Small and Anisotropic Thermal Expansion of MOF‐74

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