Facile fabrication of functional cellulose paper with high-capacity immobilization of Ag nanoparticles for catalytic applications for tannery wastewater / Ruiquan Yu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 11 p. Titre : Facile fabrication of functional cellulose paper with high-capacity immobilization of Ag nanoparticles for catalytic applications for tannery wastewater Type de document : texte imprimé Auteurs : Ruiquan Yu, Auteur ; Tianxiang Lan, Auteur ; Jing Jiang, Auteur ; Hao Peng, Auteur ; Ruifeng Liang, Auteur ; Gongyan Liu, Auteur Année de publication : 2020 Article en page(s) : 11 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Argent Catalyseurs Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules. Eaux usées Nanoparticules Papier Tannage -- Déchets Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : It has been a research goal to develop macroscopic materials with an optimized surface structure to affix silver nanoparticles which could contaminate water and maximize their practical functions. Cellulose paper is a versatile biomass material valued for its abundance, low cost, biocompatibility, and natural composition. Until now, its potential application in water purification has not been adequately explored. In this study, gallic acid-modified silver nanoparticles (GA@AgNPs) were loaded onto commercial cellulose filter paper using a simple lipoic acid modification process (GA@AgNPs-LA-CP). Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) were used to characterize the GA@AgNPs-LA-CP. The catalytic activity of the GA@AgNPs-LA-CP was evaluated by the reduction reaction of methylene blue (MB), Rhodamine B (RhB), and 4-nitrophenol (4-NP) with sodium borohydride (NaBH4). The GA@AgNPs-LA-CP exhibited excellent catalytic activity toward MB, RhB, and 4-NP, taking advantage of its high specific surface area generated by the cellulose fiber network structure. Interestingly, due to the electrostatic interactions between the cationic dyes and the GA@AgNPs, the as-prepared catalytic composite material serves as a better catalyst for MB and RhB, suggesting dual applications of the composite materials for organic wastewater treatment and the removal of harmful dyes. This implies that the immobilization of AgNPs on cellulose papers is an effective method and can be applied to efficient wastewater treatment applications. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of lipoic acid-modified cellulose paper (LA-CP) - Preparation of GA@AgNPs immobilized cellulose paper by lipoic acid modification (GA@AgNPs-LA-CP) - Characterizations - Measurement of Ag content on GA@AgNPs-LA-CP - Catalytic reduction of 4-NP, MB and RhB - RESULTS AND DISCUSSION : Preparation and characterization of GA@AgNPs-LA-CP - CATALYTIC PROPERTIES OF GA@AgNPs-LA-CP DOI : https://doi.org/10.1186/s42825-020-00019-y En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00019-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37330 [article]

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Synthesis and characterization of large particle size self-matting core-shell acrylic resin / Hao Peng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 9 (09/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 9 (09/2022) . - p. 379-390 Titre : Synthesis and characterization of large particle size self-matting core-shell acrylic resin Type de document : texte imprimé Auteurs : Hao Peng, Auteur ; Huan Wei, Auteur ; Jun Xiang, Auteur ; Haojun Fun, Auteur Année de publication : 2022 Article en page(s) : p. 379-390 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agent mattant Caractérisation Core-Shell Essais (technologie) Polyacrylate de butyle Polyacryliques Polymères -- Synthèse Polymérisation en émulsion Revêtements organiques Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Acrylic resin plays an important role in leather-making, such as finishing agent, filler and tanning agent. Acrylic resin can be easily fabricated via conventional emulsion polymerization, but how to prepare large particle size with self-matting effect has always been a challenge. In this paper, a continuous three-stage polymerization method: seed-polymerization coupled core-polymerization and shell polymerization was employed to prepare large particle size self-matting acrylic resin emulsion. Simultaneously, the effect of feeding methods on particles size and the effects of latex particle size, shell structure and cross-linking degree on the morphology and gloss of coating were investigated. The Z-average size of PBA seed latex particles was 213.4 nm for semi-continuous feeding method but 82.3nm for batch feeding method. After three-time continuous growth, the seed emulsion turned into core emulsion, and the particle size of core latex reached about 700nm. In third stages ofshell polymerization, the core emulsion was changed into core-shell emulsion, and the latex particle size increased further to 804nm. The latex particle size, core-shell structure and cross-linking degree of shell layer were found to influence the gloss of the coating. Large latex particle size imparted the film spherical micro-rough surface, soft-core combined with hard-shell structure led to deformation resistant during film formation and cross-linking of shell layer increased the densification of shell layer, all contributed to the coating rough surface, as a result, increasing the matting effect of the coating. Finally, the leather gloss was reduced from 5.8° to 1.2°. Note de contenu : - EXPERIMENT : Raw materials - Preparation of acrylic resin emulsion - Preparation of PBA seed emulsion - Preparation of PBA core growth emulsion - Preparation of P(BA-MMA/AN) core-shell emulsion - Preparation of leather coating - CHARACTERIZATION : Coating gloss test - Measurement of latex particle size distribution - Characterization of surface morphology and roughness - Characterization of glass transition temperature - RESULTS AND DISCUSSION : Effect of feeding mode on particle size of seed emulsion - Growth of core latex particle size - Effet of hardness of shell polymer on the surface morphology of coating - Effect of cross-linking on the surface morphology and gloss of the coating - Table 1 : Recipes for the preparation of PBA seed latexes - Table 2 : Recipes for the preparation of PBA core latexes - Table 3 : Recipes for the preparation of P(BA-MMA/AN) core-shell latexes - Table 4 : Diameter and number density of PBA seed latex particles at termination stage of polymerization - Table 5 : Variation of diameter and number density of PBA after growth - Table 6 : The number of PBA particles at initiation and termination stage of polymerization - Table 7 : Glass transition temperature and gloss of films with soft shell and hard shell - Table 8 : Coating roughness, theroetical ight reflectivity and gloss with different acrylic resin coating DOI : https://doi.org/10.34314/jalca.v117i9.6168 En ligne : https://drive.google.com/file/d/1msWSAo-uopmw_m_e7iSiVOsAYNkZalmh/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38077 [article]

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