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Selective Wettability Membrane for Continuous Oil−Water Separation and In Situ Visible Light‐Driven Photocatalytic Purification of Water
Global Challenges ( IF 4.9 ) Pub Date : 2020-04-16 , DOI: 10.1002/gch2.202000009
Mohammadamin Ezazi 1 , Bishwash Shrestha 1 , Sun‐I. Kim 2 , Bora Jeong 2 , Jerad Gorney 1 , Katie Hutchison 1 , Duck Hyun Lee 2 , Gibum Kwon 1
Affiliation  

Membrane‐based technologies are attractive for remediating oily wastewater because they are relatively energy‐efficient and are applicable to a wide range of industrial effluents. For complete treatment of oily wastewater, removing dissolved contaminants from the water phase is typically followed by adsorption onto an adsorbent, which complicates the process. Here, an in‐air superhydrophilic and underwater superoleophobic membrane‐based continuous separation of surfactant‐stabilized oil‐in‐water emulsions and in situ decontamination of water by visible‐light‐driven photocatalytic degradation of dissolved organic contaminants is reported. The membrane is fabricated by utilizing a thermally sensitized stainless steel mesh coated with visible light absorbing iron‐doped titania nanoparticles. Post annealing of the membrane can enhance the adhesion of nanoparticles to the membrane surface by formation of a bridge between them. An apparatus that enables continuous separation of surfactant‐stabilized oil‐in‐water emulsion and in situ photocatalytic degradation of dissolved organic matter in the water‐rich permeate upon irradiation of visible light on the membrane surface with greater than 99% photocatalytic degradation is developed. The membrane demonstrates the recovery of its intrinsic water‐rich permeate flux upon continuous irradiation of light after being contaminated with oil. Finally, continuous oil−water separation and in situ water decontamination is demonstrated by photocatalytically degrading model toxins in water‐rich permeate.

中文翻译:

连续水油分离和水的原位可见光驱动光催化净化的选择性润湿膜

基于膜的技术对含油废水的处理很有吸引力,因为它们具有较高的能效,并且适用于各种工业废水。为了完全处理含油废水,通常先从水相中去除溶解的污染物,然后再吸附到吸附剂上,这使过程变得复杂。在此报道了一种基于空气的超亲水性和水下超疏油性膜连续分离表面活性剂稳定的水包油型乳液,并通过可见光驱动的光催化降解溶解的有机污染物对水进行原位去污的方法。该膜是通过使用热敏不锈钢网制成的,该网上覆盖有可见光吸收铁掺杂的二氧化钛纳米粒子。膜的后退火可以通过在纳米颗粒之间形成桥来增强纳米颗粒对膜表面的粘附。开发了一种装置,该装置能够连续分离表面活性剂稳定的水包油乳液,并在可见光照射到膜表面时以99%以上的光催化降解率对富水渗透物中的溶解有机物进行原位光催化降解。该膜证明在被油污染后连续照射光,可恢复其固有的富水渗透通量。最后,通过光催化降解富水渗透物中的模型毒素来证明连续的油水分离和原位水净化。开发了一种装置,该装置能够连续分离表面活性剂稳定的水包油乳液,并在可见光照射到膜表面时以99%以上的光催化降解率对富水渗透物中的溶解有机物进行原位光催化降解。该膜证明在被油污染后连续照射光,其固有的富水渗透通量得以恢复。最后,通过光催化降解富水渗透物中的模型毒素来证明连续的油水分离和原位水净化。开发了一种装置,该装置能够连续分离表面活性剂稳定的水包油乳液,并在可见光照射到膜表面时以99%以上的光催化降解率对富水渗透物中的溶解有机物进行原位光催化降解。该膜证明在被油污染后连续照射光,其固有的富水渗透通量得以恢复。最后,通过光催化降解富水渗透物中的模型毒素来证明连续的油水分离和原位水净化。
更新日期:2020-04-16
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