کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6464911 | 1422946 | 2018 | 11 صفحه PDF | دانلود رایگان |
- M/I-DIPA for effective treatment co-contamination of LC and Cu(II) was fabricated.
- Porous M/I-DIPA avoids the burying of recognition sites in secondary imprinting process.
- M/I-DIPA shows fast binding, large adsorption amount, and specific capture of LC and Cu(II).
- It provides insights to design absorbents with multi-affinity to metal ions and organic pollutant.
Smart absorbents with high affinity to specific toxicant, especially with multi-affinity to both metal ions and organic pollutants, are very appealing for the treatment of heavy metal and organic co-contaminated water. A versatile strategy based on Pickering high internal phase emulsions (HIPEs) and controllable pore-filled technique was reported to fabricate molecule and ion dual-imprinted polymer adsorbent (M/I-DIPA). 2-Bromoisobutyryl bromide (BIBB)-modified silica nanoparticles (MSPs) were firstly employed to form Pickering HIPEs template, and then it was used to prepare λ-cyhalothrin (LC)-imprinted polymer foam (MIPA). Secondly, surface-initiated atom transfer radical polymerization (SI-ATRP) was adopted to controllably produce Cu(II)-imprinted adsorbent onto the MSPs which firmly “locked” in the MIPA shell. As-prepared M/I-DIPA effectively avoids the burying of recognition sites in a secondary imprinting process, and possesses highly permeable macroporous morphology. In batch mode experiments, M/I-DIPA exhibits fast binding kinetics (i.e. 60 min), and the maximum monolayer adsorption amount from Langmuir model for LC and Cu(II) are 120.8 µmol gâ1 and 101.7 µmol gâ1 at 35 °C, respectively, indicating this strategy makes the defined imprinted cavities well protected in twice imprinting steps. Moreover, LC and Cu(II) have both higher imprinting factor α (about two times) than the other structural analogues, and the excellent selectivity coefficient β in multi solute system also demonstrates the preferential affinity to templates (i.e. LC and Cu(II)) due to a good imprinting effect. The loss in adsorption amounts of M/I-DIPA for LC and Cu(II) at 120 min after four regeneration cycles are 7.295% and 13.05%, respectively, illustrating good retention of the activity of M/I-DIPA.
Journal: Chemical Engineering Journal - Volume 332, 15 January 2018, Pages 517-527