Facile fabrication of hierarchical porous ZIF-8 for enhanced adsorption of antibiotics
| Autor: | Baoliang Zhang, Xin Chen, Xue Jiang, Changjie Yin, Qiuyu Zhang |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Ostwald ripening
Environmental Engineering Materials science Health Toxicology and Mutagenesis 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences 01 natural sciences Water Purification Crystal chemistry.chemical_compound symbols.namesake Adsorption Imidazolate Environmental Chemistry Porosity Waste Management and Disposal 0105 earth and related environmental sciences 021110 strategic defence & security studies Cationic polymerization Imidazoles Microporous material Tetracycline Pollution Anti-Bacterial Agents Chloramphenicol chemistry Chemical engineering symbols Zeolites Water Pollutants Chemical BET theory |
| Zdroj: | Journal of hazardous materials. 367 |
| ISSN: | 1873-3336 |
| Popis: | Aiming for improve mass transfer rate of antibiotics adsorption from water, a strategy of building larger pores (>2 nm) in microporous MOFs has been put forward. However, most of reported approaches are complicated and inefficient. Herein, a facile one-spot approach to fabricate hierarchical porous Zeolitic Imidazolate Framework-8 (HpZIF-8) was developed, where poly(diallyldimethylammonium chloride) (PDDA) was selected as structure-directing agent to modulate the growth of microporous ZIF-8 (mZIF-8). The final products with meso- and macropores exhibit hierarchical porosity. The mechanism was a two-step process: First, crystal nucleus aggregated initiated by electrostatic interaction between cationic PDDA and deprotonated 2-MI anions. Second, Ostwald ripening process and orientated growth occurred with further growth of crystals. For removing Tetracycline Hydrochloride (TH) and Chloramphenicol (CP) from water, hierarchical porous HpZIF-8-10(D) (D = 1.0, 1.5, 2.0) showed larger adsorption capacity than mZIF-8-10 despite of decreased BET surface area, which could be attributed to novel hierarchical porous structures. The adsorption kinetics and isotherms of TH and CP by HpZIF-8-10(1.5) were analyzed. The strategy present here may provide new thoughts for designing more abundant MOF structures and further expand their application range. |
| Databáze: | OpenAIRE |
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