{"title":"可再生的β-FeOOH纳米棒改性聚偏氟乙烯膜实现了高饮用水质:性能与机理","authors":"","doi":"10.1016/j.seppur.2024.129816","DOIUrl":null,"url":null,"abstract":"<div><div>To overcome conventional membrane challenges in eliminating natural organic matter (NOM) from natural water, we successfully integrated <em>β</em>-iron hydroxide oxide (<em>β</em>-FeOOH) nanorods onto a PAA-PVDF blend membrane fabricated from poly(acrylic acid) (PAA) and polyvinylidene fluoride (PVDF).Contact angle assessments with various fluids confirmed the strong organic matter adsorption property of the membrane, with a dispersion component of surface energy at 26.7 mJ/m<sup>2</sup> for <em>β</em>-FeOOH@PAA-PVDF. This membrane consistently removed over 80 % of dissolved organic matter in the cross-flow filtration of water containing 50–150 ppm fulvic acid (FA) under neutral conditions. Such remarkable performance is attributed to the interactions between the Fe-OH groups and the carbonyl (2.960 eV) and phenolic (2.864 eV) groups of FA, overcoming the size sieving limits. Under acidic conditions, zeta potential tests revealed effective ferric coagulation, resulting in over 90 % FA (50 ppm) removal. We thoroughly investigated that common cations (e.g., K<sup>+</sup> and Ca<sup>2+</sup>) have impacts on FA removal using <em>β</em>-FeOOH@PAA-PVDF. The used membranes regained nearly original fluxes after washing with trace hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) under ultraviolet (UV) light illumination, outperforming traditional washing with sodium hypochlorite (NaClO). Electron spin resonance spectrometry elucidated the cleaning mechanism of <em>β</em>-FeOOH@PAA-PVDF was superoxide anion radical (<sup><img></sup>O<sub>2</sub><sup>−</sup>) and singlet oxygen (<sup>1</sup>O<sub>2</sub>) active species. In summary, <em>β</em>-FeOOH@PAA-PVDF showed a superior adsorption capacity (2200 mg/m<sup>2</sup>) and efficient photocatalytic degradation towards NOM in natural water, providing an efficient cleaning technology for membrane reuse.</div></div>","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":null,"pages":null},"PeriodicalIF":8.1000,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Renewable β-FeOOH nanorods modified polyvinylidene fluoride membrane enables high potable water quality: Performance and mechanisms\",\"authors\":\"\",\"doi\":\"10.1016/j.seppur.2024.129816\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>To overcome conventional membrane challenges in eliminating natural organic matter (NOM) from natural water, we successfully integrated <em>β</em>-iron hydroxide oxide (<em>β</em>-FeOOH) nanorods onto a PAA-PVDF blend membrane fabricated from poly(acrylic acid) (PAA) and polyvinylidene fluoride (PVDF).Contact angle assessments with various fluids confirmed the strong organic matter adsorption property of the membrane, with a dispersion component of surface energy at 26.7 mJ/m<sup>2</sup> for <em>β</em>-FeOOH@PAA-PVDF. This membrane consistently removed over 80 % of dissolved organic matter in the cross-flow filtration of water containing 50–150 ppm fulvic acid (FA) under neutral conditions. Such remarkable performance is attributed to the interactions between the Fe-OH groups and the carbonyl (2.960 eV) and phenolic (2.864 eV) groups of FA, overcoming the size sieving limits. Under acidic conditions, zeta potential tests revealed effective ferric coagulation, resulting in over 90 % FA (50 ppm) removal. We thoroughly investigated that common cations (e.g., K<sup>+</sup> and Ca<sup>2+</sup>) have impacts on FA removal using <em>β</em>-FeOOH@PAA-PVDF. The used membranes regained nearly original fluxes after washing with trace hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) under ultraviolet (UV) light illumination, outperforming traditional washing with sodium hypochlorite (NaClO). Electron spin resonance spectrometry elucidated the cleaning mechanism of <em>β</em>-FeOOH@PAA-PVDF was superoxide anion radical (<sup><img></sup>O<sub>2</sub><sup>−</sup>) and singlet oxygen (<sup>1</sup>O<sub>2</sub>) active species. In summary, <em>β</em>-FeOOH@PAA-PVDF showed a superior adsorption capacity (2200 mg/m<sup>2</sup>) and efficient photocatalytic degradation towards NOM in natural water, providing an efficient cleaning technology for membrane reuse.</div></div>\",\"PeriodicalId\":427,\"journal\":{\"name\":\"Separation and Purification Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":8.1000,\"publicationDate\":\"2024-09-23\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Separation and Purification Technology\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S138358662403555X\",\"RegionNum\":1,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Separation and Purification Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S138358662403555X","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
Renewable β-FeOOH nanorods modified polyvinylidene fluoride membrane enables high potable water quality: Performance and mechanisms
To overcome conventional membrane challenges in eliminating natural organic matter (NOM) from natural water, we successfully integrated β-iron hydroxide oxide (β-FeOOH) nanorods onto a PAA-PVDF blend membrane fabricated from poly(acrylic acid) (PAA) and polyvinylidene fluoride (PVDF).Contact angle assessments with various fluids confirmed the strong organic matter adsorption property of the membrane, with a dispersion component of surface energy at 26.7 mJ/m2 for β-FeOOH@PAA-PVDF. This membrane consistently removed over 80 % of dissolved organic matter in the cross-flow filtration of water containing 50–150 ppm fulvic acid (FA) under neutral conditions. Such remarkable performance is attributed to the interactions between the Fe-OH groups and the carbonyl (2.960 eV) and phenolic (2.864 eV) groups of FA, overcoming the size sieving limits. Under acidic conditions, zeta potential tests revealed effective ferric coagulation, resulting in over 90 % FA (50 ppm) removal. We thoroughly investigated that common cations (e.g., K+ and Ca2+) have impacts on FA removal using β-FeOOH@PAA-PVDF. The used membranes regained nearly original fluxes after washing with trace hydrogen peroxide (H2O2) under ultraviolet (UV) light illumination, outperforming traditional washing with sodium hypochlorite (NaClO). Electron spin resonance spectrometry elucidated the cleaning mechanism of β-FeOOH@PAA-PVDF was superoxide anion radical (O2−) and singlet oxygen (1O2) active species. In summary, β-FeOOH@PAA-PVDF showed a superior adsorption capacity (2200 mg/m2) and efficient photocatalytic degradation towards NOM in natural water, providing an efficient cleaning technology for membrane reuse.
期刊介绍:
Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.