The main aim of the current study is to prepare super-hydrophobic polypropylene hollow fiber membranes . However, polypropylene hollow fiber membrane surface is very smooth and difficult to attach silica particles . To solve this problem, a method including combined use of silica particles and polypropylene solution is used to preparation the super-hydrophobic coatings. The collosol mixed by the silica particles and PP particles were coated to the membrane surface. Then the membrane was modified by 1H,1H,2H,2H-Perfluorooctyltriethoxysilane (POTS) that exhibited a super-hydrophobic surface with a static water contact angle of 157°. Surface elemental analyses of membrane were characterized by XPS and surface analyses (FT-IR, FESEM, AFM , contact angle measurements and MIP). In addition, membrane distillation experiments of NaCl solutions were carried out in unmodified and modified polypropylene hollow fiber membrane. The results indicated that, compared with the untreated membranes, the modified membranes had higher flux and rejection.
Jinyue Yang,Zhanjian Liu,Jing Jing,Xiguang Zhang,Yuxin Fu,Meiling Li,Huaiyuan Wang
Design functionalized absorbent materials that fulfillment complex requirements in sophisticated water-treatment fields remains challenging. In this paper, a novel superhydrophobic/superoleophilic sponge with flower-like channel structures and a photodegradation functionality was fabricated via in-situ chelation of zinc oxide (ZnO) and nano-Ag particles. After low surface energy modification with POTS, the as-prepared sponge displayed remarkable superwettability, with a water contact angle (WCA) of 158.8° ± 1.3°. This endowed it with the ultrafast, selective absorption of diverse oils that are 33.9–135.2 times of their own weight. The prepared sponge’s emulsified oil separation efficiency can reach 99.87%, owing to its superhydrophobic/superoleophilic properties and the electrostatic attraction demulsification, guiding effect of ZnO layer crystal plane. Furthermore, the construction of Schottky barrier at the ZnO@Ag interface reduced the recombination rate of photoexcited electrons and electron-holes. Thereby, the prepared sponge’s photodegradation efficiency reached up to 97.07% after 4 h sunlight irradiation. Notably, the stress attenuation of the prepared sponge was only 14.6% after 100 absorption cycles, indicating its excellent mechanical stability. Moreover, the prepared sponge showed excellent environmental tolerance under severe conditions with its WCA stably exceeding 150.0°. Thus, this durable superwetting sponge can be effectively used for oil/water emulsion separation and organic pollutant degradation.
危险品化学品经营许可证（带存储）