Nanoscale zeolitic imidazolate framework-8 as a selective adsorbent for theophylline over caffeine and diprophylline

Yan, Fang; Liu, Zhongying; Chen, Jinlong; Xiao-yan, Sun; Li, Xiaojuan; Su, Mengxiang; Li, Bo; Di, Bin

doi:10.1039/c4ra05293e

Cited by 24 publications

(11 citation statements)

References 50 publications

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“…Importantly, ZIF-8 has been reported for selective adsorption 13 and detection 14 . Nevertheless, the photocatalytic performance of ZIF-8 is not well applicated.…”

Section: Introductionmentioning

confidence: 99%

“…Zeolitic Imidazolate Framework-8 (ZIF-8, also named zeolitic metal azolate frameworks, MAF-4) as a kind of MOFs with pore size of 11.6 Å through 3.4 Å apertures 9 has potential selectivity in adsorption, 10 catalytic process, 11 gas separation, and capturing target materials, 12 etc. Importantly, ZIF-8 has been reported for selective adsorption 13 and detection. 14 Nevertheless, the photocatalytic performance of ZIF-8 is not well applicated.…”

Section: Introductionmentioning

confidence: 99%

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Rapid Construction of ZnO@ZIF-8 Heterostructures with Size-Selective Photocatalysis Properties

Wang

Liu

Leong

et al. 2016

ACS Appl. Mater. Interfaces

334

109

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To selectively remove heavy metal from dye solution, inspired by the unique pore structure of ZIF-8, we developed a synthetic strategy for rapid construction of ZnO@ZIF-8 heterostructure photocatalyst for selective reduction of Cr(VI) between Cr(VI) and methylene blue (MB). In particular, ZnO@ZIF-8 core-shell heterostructures were prepared by in situ ZIF-8 crystal growth using ZnO colloidal spheres as template and zinc source within 8-60 min. The shell of the resulting ZnO@ZIF-8 core-shell heterostructure with a uniform thickness of around 30 nm is composed of ZIF-8 crystal polyhedrons. The concentration of organic ligand 2-methylimidazole (Hmim) was found to be crucial for the formation of ZnO@ZIF-8 core-shell heterostructures. Different structures, ZnO@ZIF-8 core-shell spheres and separate ZIF-8 polyhedrons could be formed by altering Hmim concentration, which significantly influences the balance between rate of Zn(2+) release from ZnO and coordinate rate. Importantly, such ZnO@ZIF-8 core-shell heterostructures exhibit size-selective photocatalysis properties due to selective adsorption and permeation effect of ZIF-8 shell. The as-synthesized ZnO@ZIF-8 heterostructures exhibited enhanced selective reduction of Cr(VI) between Cr(VI) and MB, which may find application in the dye industry. This work not only provides a general route for rapid fabrication of such core-shell heterostructures but also illustrates a strategy for selectively enhanced photocatalysis performance by utilizing adsorption and size selectivity of ZIF-8 shell.

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“…Importantly, ZIF-8 has been reported for selective adsorption 13 and detection 14 . Nevertheless, the photocatalytic performance of ZIF-8 is not well applicated.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rapid Construction of ZnO@ZIF-8 Heterostructures with Size-Selective Photocatalysis Properties

Wang

Liu

Leong

et al. 2016

ACS Appl. Mater. Interfaces

334

109

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show abstract

“…29 It is its high BET specic surface area (SSA) (z2000 m 2 g À1 ) 30 and permanent porosity from its uniformly sized pore cavities (of z1.16 nm and pore volume of z0.60 cm 3 g À1 ) 30 that make ZIF-8 particularly desirable for many potential applications, such as gas storage, [31][32][33][34][35] separation by membrane sieving, [36][37][38][39] templating, 40,41 catalysis, [42][43][44] and shape-selective distillation, [45][46][47][48] sensing 49 and so on. 50,51 With this paper, the ZIF-8 was synthesized and characterized by powder X-ray diffraction, Fourier transform infrared spectra FTIR, UV-vis diffuse reectance spectra. And, ZIF-8 was selected as photocatalyst to decompose methylene blue (MB), a typical model of dye contaminant, under UV light irradiation.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of methylene blue in ZIF-8

et al. 2014

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“…However, ZIF‐8 on the surface of CF plays a vital role in the adsorption of CR in this work. So the pure ZIF‐8 particles were applied to confirm the mechanism by UV‐vis spectrum . The main adsorption peak appears a bathochromic shift from 499 nm to 502 nm after the addition of ZIF‐8 or 2‐methylimizole (Figure c), which indicates the existence of π‐π interaction between CR and CF/ZIF‐8.…”

Section: Resultsmentioning

confidence: 99%

Rapid in Situ Self‐Assembly of Carbon Fibers/ZIF‐8 Composite for Efficient Adsorption Enhancement of Congo Red

Xiong

Wang

et al. 2019

ChemistrySelect

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Although carbon fibers (CFs) are born with special physicochemical properties, the common CFs show the poor adsorption performance owing to the lack of adsorption sites and porosity with low specific surface area. As emerging functional materials, metal-organic frameworks (MOFs) have attracted significant attention due to excellent properties, which has the ability of remedying drawbacks of other materials. In this study, zeolitic imidazolate framework-8 (ZIF-8) was rapidly coated on the surface of carbon fibers (CFs) (CF/ZIF-8) via in-situ selfassembly approach in 10 min. The scanning electron microscope (SEM) images show ZIF-8 film on CF is dense and homogeneous due to the low reactivity of zinc acetate and the coordination interaction between Zn 2 + and carboxyl of CF treated by nitric acid (CF-COOH). The Brunauer-Emmett-Teller (BET) surface area of CF/ZIF-8 composite is about 30 times larger than that of pristine CF. The adsorption selectivity of CFs was increased after the modification of ZIF-8 demonstrating by adsorbing different dyes. The CF/ZIF-8 composites were applied to remove congo red (CR) from aqueous solutions with the adsorption capacity 40 times more than that of pristine CF and CF-COOH, because of the increasing specific surface, electrostatic interaction and π-π interaction between ZIF-8 and CR molecule. The MOFs/CFs composites we fabricated also have great promise applications in micro-preconcentration and electrochemistry.

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Nanoscale zeolitic imidazolate framework-8 as a selective adsorbent for theophylline over caffeine and diprophylline

Abstract: Exploration of zeolitic imidazolate framework-8 as an adsorbent for selective adsorption of theophylline over caffeine and diprophylline in aqueous solution.

Cited by 24 publications

References 50 publications

Rapid Construction of ZnO@ZIF-8 Heterostructures with Size-Selective Photocatalysis Properties

Rapid Construction of ZnO@ZIF-8 Heterostructures with Size-Selective Photocatalysis Properties

Photocatalytic degradation of methylene blue in ZIF-8

Rapid in Situ Self‐Assembly of Carbon Fibers/ZIF‐8 Composite for Efficient Adsorption Enhancement of Congo Red

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