Mohammad Aghajari, Amir Mansourizadeh, Mehdi Faramarzi, Ali Jelvegar Filband
{"title":"Upgrading PVDF-HFP hollow fiber membrane by cellulose acetate coating for membrane distillation of oily wastewater","authors":"Mohammad Aghajari, Amir Mansourizadeh, Mehdi Faramarzi, Ali Jelvegar Filband","doi":"10.1007/s10570-025-06525-8","DOIUrl":null,"url":null,"abstract":"<div><p>Treatment of oily wastewater by membrane distillation (MD) has been used for the purposes of meeting environmental release, reuse water quality and freshwater demand. The modified polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) hollow fiber membranes were fabricated for treating oily wastewater via an air gap membrane distillation (AGMD) process. The dip-coating of cellulose acetate (CA) on the inner surface was performed to improve oil-fouling resistance and durability of the MD operation. From field emission scanning electron microscopy (FESEM) analysis, the CA-coated membrane exhibited an open structure regarded as finger-like and sponge-like morphologies, achieving an overall porosity of approximately 80%. The CA coating on the PVDF-HFP surface was confirmed by Fourier transform infrared spectroscopy (FTIR) analysis as the hydroxyl and carboxylic groups were observed. There was a notable improvement in surface hydrophilicity of the CA-coated membrane, as indicated by a reduction in the WCA from about 92° to 58°. The N<sub>2</sub> permeance and mean pore size of the CA-coated membrane were measured at 5450 GPU and 22.2 nm, respectively. The CA-coated membrane demonstrated stable performance, achieving a water flux of about 23 kg/m<sup>2</sup>·h and an oil rejection of 99% during 72 h operation. However, a significant decline in water flux and oil rejection was observed for the pristine membrane. The CA-coated membrane exhibited enhanced oil-fouling resistance, with a flux recovery ratio (FRR) of approximately 92%. Langmuir oil adsorption and atomic force microscopy (AFM) analysis were further confirmed the marginal oil fouling on the CA-coated membrane surface. Therefore, the combination of improved hydrophilicity, structural integrity, and resistance to fouling makes the CA-coated membrane as a promising solution for efficient oily wastewater management.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":511,"journal":{"name":"Cellulose","volume":"32 7","pages":"4449 - 4467"},"PeriodicalIF":4.8000,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cellulose","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s10570-025-06525-8","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, PAPER & WOOD","Score":null,"Total":0}
引用次数: 0
Abstract
Treatment of oily wastewater by membrane distillation (MD) has been used for the purposes of meeting environmental release, reuse water quality and freshwater demand. The modified polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) hollow fiber membranes were fabricated for treating oily wastewater via an air gap membrane distillation (AGMD) process. The dip-coating of cellulose acetate (CA) on the inner surface was performed to improve oil-fouling resistance and durability of the MD operation. From field emission scanning electron microscopy (FESEM) analysis, the CA-coated membrane exhibited an open structure regarded as finger-like and sponge-like morphologies, achieving an overall porosity of approximately 80%. The CA coating on the PVDF-HFP surface was confirmed by Fourier transform infrared spectroscopy (FTIR) analysis as the hydroxyl and carboxylic groups were observed. There was a notable improvement in surface hydrophilicity of the CA-coated membrane, as indicated by a reduction in the WCA from about 92° to 58°. The N2 permeance and mean pore size of the CA-coated membrane were measured at 5450 GPU and 22.2 nm, respectively. The CA-coated membrane demonstrated stable performance, achieving a water flux of about 23 kg/m2·h and an oil rejection of 99% during 72 h operation. However, a significant decline in water flux and oil rejection was observed for the pristine membrane. The CA-coated membrane exhibited enhanced oil-fouling resistance, with a flux recovery ratio (FRR) of approximately 92%. Langmuir oil adsorption and atomic force microscopy (AFM) analysis were further confirmed the marginal oil fouling on the CA-coated membrane surface. Therefore, the combination of improved hydrophilicity, structural integrity, and resistance to fouling makes the CA-coated membrane as a promising solution for efficient oily wastewater management.
期刊介绍：
Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.
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