Dye removal using hydrophobic polyvinylidene fluoride hollow fibre composite membrane by vacuum membrane distillation / Hongbin Li in COLORATION TECHNOLOGY, Vol. 135, N° 6 (12/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 6 (12/2019) . - p. 451-466 Titre : Dye removal using hydrophobic polyvinylidene fluoride hollow fibre composite membrane by vacuum membrane distillation Type de document : texte imprimé Auteurs : Hongbin Li, Auteur ; Xiangwei Feng, Auteur ; Wenying Shi, Auteur ; Zhang Haixia, Auteur ; Qiyun Du, Auteur ; Longwei Qin, Auteur ; Xiaohong Qin, Auteur Année de publication : 2019 Article en page(s) : p. 451-466 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Caractérisation Colorants Colorants -- Elimination Déchets industriels -- Elimination Eaux usées -- Epuration Fibres creuses Hydrophobie Membranes (technologie) Polyfluorure de vinylidène Index. décimale : 668.5 Parfums et cosmétiques Résumé : Hydrophobic polyvinylidene fluoride (PVDF) hollow fibre composite membranes were prepared by the dilute solution coating process to build a special surface structure that was similar to the dual micro‐nano structure on the lotus leaf. Poly(vinylidene fluoride‐co‐hexafluoropropene) was chosen as the hydrophobic polymer candidate in dilute solution. Membrane morphology and surface hydrophobicity were evaluated by scanning electron microscopy and dynamic water contact angle measurement. The prepared PVDF hollow fibre membranes were employed to separate dyes (Congo Red and Methylene Blue) from water by vacuum membrane distillation. The effects of operational conditions (feed temperature, vacuum pressure and feed flow rate) on the vacuum membrane distillation performance of different PVDF membranes were investigated. The results indicated that the water contact angle values of PVDF composite membrane surfaces improved from 93.6° to 130.8°, which was mainly attributed to the formation of micro‐nano rods. This structure was similar to the dual micro‐nano structure on the lotus leaf. Under test feed temperature, vacuum pressure and feed flow rate conditions, the dye rejection rate of Congo Red and Methylene Blue by the hydrophobic PVDF hollow fibre membrane remained above 99.5% and 99%, which was higher than that of the pristine PVDF membrane (99% and 98%, respectively). In addition, the hydrophobic PVDF hollow fibre composite membrane showed higher permeation flux under different conditions compared with the pristine PVDF membrane, which was attributed to membrane surface hydrophobicity and the electrostatic interactions between dyes and the PVDF membrane surface. Note de contenu : - EXPERIMENTAL : Materials - Preparation of the single PVDF hollow fibre membrane - Preparation of the composite PVDF hollow fibre membrane - Characterisation of the PVDF hollow fibre membrane - VMD experiments - Membrane anti-fouling experiments - RESULTS AND DISCUSSION : Morphology of different PVDF hollow fibre membranes - performance parameters of different PVDF membranes - Hydrophobicity of the membrane surface - Performance characterisation of hollow fibre membranes in VMD for dye removal - Effects of feed temperature on VMD performance - Effects of vacuum pressure on VMD performance - Effects of feed flow rate on VMD performance - Fouling behaviour of hollow fibre membranes in VME for dye removal DOI : 10.1111/cote.12436 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12436 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33377 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21322	-	Périodique	Bibliothèque principale	Documentaires	Disponible

UV irradiation grafting of acrylamide onto dopamine-modified 316L stainless steel / Nan Yao in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 1181-1189 Titre : UV irradiation grafting of acrylamide onto dopamine-modified 316L stainless steel Type de document : texte imprimé Auteurs : Nan Yao, Auteur ; Jie Chen, Auteur ; Guochen Zhao ; Ye Huang ; Liming Yang ; Hongbin Li ; Zhenmei Sheng Année de publication : 2018 Article en page(s) : p. 1181-1189 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acier inoxydable Anticorrosion Greffage (chimie) Métaux -- Revêtements protecteurs Polyacrylamide Le polyacrylamide est un polymère (-CH2-CH(-CONH2)-) formé à partir d'acrylamide. Il peut être réticulé en incorporant dans le mélange de polymérisation un dérivé bi-fonctionnel de l'acrylamide : le N,N'-méthylène-bis-acrylamide (CH2=CH-CO-NH-)2CH2. Le polyacrylamide, contrairement à l'acrylamide qui est neurotoxique, n'est pas toxique mais il doit être manipulé avec précaution car il peut contenir des résidus d'acrylamide. c'est un gel hautement absorbant. Sous forme de poudre, il se dilue dans l'eau pour former un gel visqueux après agitation vigoureuse. Des substances ioniques telles le sel permettent au polyacrylamide de libérer les substances absorbées. L'intérêt de ce polymère peut être apprécié dans son caractère de fluide non newtonien, et constitue un bon exemple d'application de l'effet Weissenberg: le fluide, soumis à l'action d'un agitateur magnétique remonte au centre du récipient au lieu de se plaquer sur les côtés, comme l'aurait fait un fluide newtonien classique, comme l'eau. Polydopamine Rayonnement ultraviolet Ultrasons Index. décimale : 667.9 Revêtements et enduits Résumé : UV irradiation grafting technique was applied on a modified 316L stainless steel (SS) surface. The SS sheets were first coated with dopamine by dipping in the dopamine solution with KIO3 and ultrasonication. Then, the acrylamide (AAm) was grafted onto the dopamine-modified SS samples under UV irradiation with ultrasonication, when the ketone-diol compound was used as a photoinitiating system. For comparison, the UV irradiation grafting of AAm was also performed without ultrasonication. The structures and morphologies of the samples were examined by Fourier transform IR spectroscopy, atomic force microscopy, and scanning electronic microscopy before and after modification, respectively. Results showed that acrylamide was successfully grafted onto the poly-dopamine-coated SS. The hydrophilicity of the modified samples improved significantly, determined by the water contact angle measurement. Shown by Tafel polarization curves, the corrosion potential of modified SS was positively shifted, which demonstrated that the corrosion resistance was improved. Note de contenu : - EXPERIMENTAL : Instruments and materials - Stainless steel surface process - Deposition of poly-dopamine onto stainless steel - UV grafting of AAM onto the surface of PDS-SS - Surface characterization - RESULTS AND DISCUSSION : Deposition of dopamine - Fourier transform IR (FTIR) spectroscopy - Surface morphologies of samples - Water contact angle test - Corrosion resistance test DOI : 10.1007/s11998-018-0095-7 Thèse : 10.1007/s11998-018-0095-7 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0095-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31148 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
20232	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 2 / 2)