Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 418, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126295
Keywords
Polypropylene foam; CNT; sorbitol derivative; Thermal insulation; Compressive strength; Oil; water separation
Categories
Funding
- National Natural Science Foundation of China (NSFC) [51875318, 51905308, 51905307]
- Shandong Provincial Key Research and Development Program (Major Scientific and Technological Innovation Project) [2019JZZY020205]
- Qilu Outstanding Scholar Program of Shandong University, China
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Water pollution caused by industrial oily wastewater has attracted global attention due to its catastrophic destruction to the environment. This study proposes a novel approach to fabricate oil-absorbing microcellular polypropylene foam, which demonstrates superior absorption capacity and oil/water separation efficiency.
Water pollution caused by industrial oily wastewater, is world-widely concerned by both scientific and practical researches, owing to its catastrophic destruction to natural environment, which highlights the urgency of pro-ducing green and advanced separation materials. Herein, a novel approach was proposed to fabricate oil-absorbing and oil/water-separating microcellular polypropylene (PP)/carbon nanotubes (CNTs)/sorbitol nano-composites using a simple, green, and facile microcellular foaming technology. Owning to the effectively modified crystallization via introducing CNTs/sorbitol derivatives, the ultralight and highly-reticulated PP microcellular foam was prepared with an open-cel l content of 99.4% and an expansion ratio of 50, which facilitated the creation of nano-porous structures on cel l walls. Hence, the as-prepared PP nanocomposite foam presented pronounced absorption capacity of 40 g/g for applied oils with recove r y efficiency of 97.2%, superior thermal-insulating and mechanical performance. Furthermore, the as-achieved unique hierarchical porous structures of the PP/CNT/sorbitol foam contributed to the outstanding oil/water separation capability, separa-tion efficiency of up-to 97.6%, ascribed to its superhydrophobicity, capilla r y penetration action, high porosit y and open-ce l l content. Therefore, this work provided new insight into the feasibility of advantageous, high-efficiency, environmentally friendly, and profitable PP-based foams as oi l absorbents, which, to the best of our knowledge, outperform conventional polymer absorbents in treatment of oily wastewater.
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