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Jang, Jaewon
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article
Improved Pressure Drop and Silica Rejection of Polydopamine Coated Polypropylene Filter Media
Abstract
Cartridge filter consists of a plastic housing and simple modular melt-blown polypropylene (PP) filter media which is used to provide excellent and stable filtration performance. However, a significant differential pressure is generated in PP cartridge filters during operation of filtering system due to their hydrophobic characteristics. In this study, the surface of PP filter media was coated with polydopamine (pDA) to improve its hydrophilicity and performance. The surface characteristics of pDA coated PP (PP-pDA) were studied by scanning electron microscopic (SEM), energy dispersive x-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR), and capillary flow porometer. These results showed that a pDA coating was successfully available on the surface of PP. The hydrophilicity was studied by calculation of water uptake and measurement of contact angle; water uptake of PP-pDA was improved from 37 to 298% (increased by 8 times) and contact angle results showed that hydrophilicity of PP-pDA was improved (39.67º) in comparison with pristine PP (120.26º). Eventually, pure water permeability, differential pressure and silica rejections of PP-pDA filter media were improved due to its hydrophilicity. Thus, hydrophilic PP filter media coated with pDA solution could be a good choice for cartridge filters in the water treatment area.