Hierarchical porous zeolitic imidazolate frameworks (ZIF-8) and ZnO@N-doped carbon for selective adsorption and photocatalytic degradation of organic pollutants

Removing organic contaminants such as dyes from water is essential to purify wastewater. Herein, zeolitic imidazolate framework-8 (ZIF-8) and ZnO@N-doped C are reported as effective adsorbents and photocatalysts for the adsorption and degradation of organic dyes. The materials showed effective and s...

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Bibliographic Details
Published in:RSC advances 2022-03, Vol.12 (12), p.7075-7084
Main Authors: Soliman, Ahmed I A, Abdel-Wahab, Aboel-Magd A, Abdelhamid, Hani Nasser
Format: Article
Language:English
Subjects:
Adsorption
Chemistry
Contaminants
Dyes
Fluorescein
Mass spectrometry
Materials selection
Metal-organic frameworks
Photocatalysis
Photocatalysts
Photodegradation
Pollutants
Selective adsorption
Wastewater
Water purification
Zeolites
Zinc oxide
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Summary:Removing organic contaminants such as dyes from water is essential to purify wastewater. Herein, zeolitic imidazolate framework-8 (ZIF-8) and ZnO@N-doped C are reported as effective adsorbents and photocatalysts for the adsorption and degradation of organic dyes. The materials showed effective and selective adsorption toward anionic dyes such as methyl blue (MeB) dye in the presence of fluorescein (FLU) dye. The adsorption capacities of ZnO@N-doped C for MeB and FLU dyes are 900 mg g and 100 mg g , respectively. According to UV-Vis diffuse reflectance spectroscopy (DRS) data, ZnO@N-doped C has a lower bandgap (2.07 eV) than ZIF-8 (4.34 eV) and ZnO (3.12 eV). Thus, ZnO@N-doped C serves as an effective photocatalyst for the degradation of both dyes under UV exposure. The degradation efficiency capacity of the dye (50 mg L ) is >90% using 200 mg L of the photocatalyst. The mechanism of adsorption and photocatalysis is investigated. The photodegradation pathway of the dye involved the generation of oxidative hydroxy radicals (OH˙), which can degrade the dyes. The degradation products of FLU were recorded using mass spectrometry.
ISSN:2046-2069
2046-2069
DOI:10.1039/d2ra00503d