Durable anti-oil-fouling superhydrophilic membranes for oil-in-water emulsion separation

Author:

Fu Sida123,Xu Yaling4,Wang Hongbo2,Sun Fengxin2,He Jianrong3,Liu Zhigang3,Xu Zhiguang14,Wang Hongxia5,Lin Tong5

Affiliation:

1. China-Australia Institute for Advanced Materials and Manufacturing , Jiaxing University , Jiaxing 314001 , China

2. School of Textiles and Clothing , Jiangnan University , Wuxi 214122 , China

3. Ningbo Water Supply Co., Ltd , Ningbo 315041 , China

4. College of Biological, Chemical Sciences and Engineering , Jiaxing University , Jiaxing 314001 , China

5. Institute for Frontier Materials , Deakin University , Geelong , VIC 3216 , Australia

Abstract

Abstract Marine mussel-inspired polydopamine (PDA) coatings show excellent hydrophilicity and substrate-independent adhesion ability, but low stability, especially in a harsh environment such as strong acid or strong base, significantly restricts their applications. In this work, we prepare a novel superhydrophilic and underwater superoleophobic coating based on a modified PDA. Diglycidyl resorcinol ether (DGRE) polyethyleneimine (PEI) and iron ions were incorporated into PDA to strengthen the cross-linking and coating durability. By using three chemically inert hydrophobic membranes, polytetrafluoroethylene (PTFE), poly(vinylidene fluoride), and polypropylene, as substrates, we showed that PDA/PEI/DGRE-coated membranes had a water contact angle (CA) of 0° and underwater oil CA above 157°, and their underwater oil SAs were <7°. The coating is durable against both physical and chemical damages including ultrasound and heat treatments, as well as acid/alkaline etching. After ultrasound treatment in water for 60 min, and heating treatment for 3 h, or acid/alkaline etching for 3 h, the coated PTFE membrane still showed water CAs of ∼0° in air and underwater oil CAs of ∼150°. The coated membranes can efficiently separate oil-in-water emulsions, even in strong acid and base environments. The water flux was above 1500 L m−2 h−1, and the oil rejection was above 99%.

Publisher

Walter de Gruyter GmbH

Subject

Materials Chemistry,Polymers and Plastics,General Chemical Engineering

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