Yu Chuanming, Lin Wenyu, Jiang Jine, Jing Zhanxin, Hong Pengzhi, Li Yong
Faculty of Chemistry and Environmental Science, Guangdong Ocean University Zhanjiang 524088 PR China
RSC Adv. 2019 Nov 19;9(65):37759-37767. doi: 10.1039/c9ra06848a.
In order to cope with the increasing oil spill accidents and the intentional discharge of oily wastewater, a new oil-adsorbing material with superhydrophobicity and reusability is needed. In this paper, waste plastic was used to fabricate an alveolate polystyrene (PS) foam to reduce secondary pollution. The PS foam was synthesized from a high internal phase Pickering emulsion (HIPPE) technique in a one-step process. The emulsion was stabilized by a co-Pickering system of Span 80 surfactant and SiO particles. To explain the super stability of the HIPPE, a novel model of the water-in-oil droplet was promoted. The obtained SiO@PS foam exhibited a multi-order-porous structure, and displayed superhydrophobicity and superoleophilicity. It can selectively remove various oily contaminants from water with a high adsorption capacity of 20.4-58.1 g g at a fast rate. The oil-adsorbed material can be reused by simple centrifugation, and no more than a 1% decline was obtained in the oil adsorption after 10 cycles. Therefore, the SiO@PS foam has a great potential application in oily water treatment.
为应对日益增多的石油泄漏事故和含油废水的故意排放，需要一种具有超疏水性和可重复使用性的新型吸油材料。本文利用废塑料制备了一种蜂窝状聚苯乙烯（PS）泡沫以减少二次污染。该PS泡沫通过高内相Pickering乳液（HIPPE）技术一步合成。乳液由Span 80表面活性剂和SiO颗粒的共Pickering体系稳定。为解释HIPPE的超稳定性，提出了一种新型的油包水液滴模型。所制备的SiO@PS泡沫呈现多级多孔结构，并表现出超疏水性和超亲油性。它能够以20.4 - 58.1 g/g的高吸附容量快速选择性地从水中去除各种油性污染物。吸附油后的材料通过简单离心即可重复使用，10次循环后吸油性能下降不超过1%。因此，SiO@PS泡沫在含油污水处理中具有巨大的潜在应用价值。
