期刊
CHEMOSPHERE
卷 286, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.131520
关键词
Carbon; Adsorption; Nanoparticles; Aerogel; Polyvinyl alcohol; Superhydrophobicity
资金
- National Research Foundation Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) programme [R-706-001-102-281]
The superhydrophobic composite aerogel prepared from industrial waste-derived leached carbon black waste and polyvinyl alcohol showed excellent oil-water separation performance and selective adsorption capabilities, making it an effective solution for the remediation of oil spills.
The remediation of oil spills and treatment of oily wastewater remains challenging to cope with nowadays. This has caused a surge in demand on adsorbent materials with multi-functionalities to effectively separate oils and nonpolar solvents from water. A superhydrophobic composite aerogel prepared from industrial waste-derived leached carbon black waste (LCBW) and polyvinyl alcohol (PVA) was developed in this work via conventional freeze-casting followed by surface coating. The composite aerogel was ultralight and porous with porosity >85% and tunable density ranging between 0.015 and 0.065 g/cm3. It was found that the embedded LCBW in the PVA network is crucial to impart superhydrophobicity and superoleophilicity to the aerogel as it enhances the surface roughness. Wettability test showed that composite aerogel prepared from 0.5 wt% PVA at PVA/LCBW ratio of 1 exhibited the highest water contact angle (156.7 +/- 2.9 degrees). LCBW also improved the thermal stability of the composite aerogel. With its superior selectivity, PVA/LCBW aerogel was used as selective adsorbent for a variety of oils and organic solvents. The adsorption test showed that the composite aerogel exhibited an adsorption capacity up to 35 times its original weight and could be reused repeatedly and easily recovered through a simple drying method.
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