Iron(III) complexes promote hydrogen peroxide activation for efficient degradation of dyeing wastewater / Shouying Wu in COLORATION TECHNOLOGY, Vol. 140, N° 3 (06/2024)  

[article]  inCOLORATION TECHNOLOGY > Vol. 140, N° 3 (06/2024) . - p. 496-506 Titre : Iron(III) complexes promote hydrogen peroxide activation for efficient degradation of dyeing wastewater Type de document : texte imprimé Auteurs : Shouying Wu, Auteur ; Linping Zhang, Auteur ; Jianing Fan, Auteur ; Wei Wu, Auteur ; Bolin Ji, Auteur ; Xueling Feng, Auteur ; Bijia Wang, Auteur ; Yimeng Ma, Auteur ; Yi Zhong, Auteur ; Hong Xu, Auteur ; Zhiping Mao, Auteur Année de publication : 2024 Article en page(s) : p. 496-506 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Catalyse Catalyseurs métalliques Colorants -- Détérioration Complexes métalliques Eaux usées -- Décontamination Eaux usées -- Epuration Fer trivalent Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Index. décimale : 667.3 Teinture et impression des tissus Résumé : Coordination complexes were widely used in advanced oxidation processes. The ligands with various substituents could lead to differences in the catalytic properties and mechanisms. In this work, the iron(III)–N,N′-dipicolinamide (FeL) complexes (the iron(III) complexes with substituents –CH3, –H, –Cl and –NO2 named as FeL1, FeL2, FeL3 and FeL4, respectively) were used to activate hydrogen peroxide (H2O2) for degrading dyes wastewater. Mechanism studies indicated that the FeL4/H2O2 system contains the FeV=O in addition to the same •OH and O2•− as the other systems, which made it exhibit more excellent performance than others. The results of the performance tests showed that the FeL4/H2O2 system could remove 97%, 89%, 100%, 83%, 100%, and 99% of RR195, RY145, RB194, RB19, MB, and RhB, respectively, which proved the good application performance of the FeL4/H2O2 system. In addition, the performance of the FeL4/H2O2 system was not influenced by anions and natural organics. This study verified the feasibility of modulating the catalytic performance of the complexes by changing the substituents and provided an efficient catalytic system for dyeing wastewater treatment. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of ligands - Preparation of FeL - Degradation experimental procedure - Analytical methods - RESULTS AND DISCUSSION : Characterisation of structures - Substituents effects of the FeL complexes - Influence of reaction parameters on the catalytic performance of FeL4/H2O2 system - Application of FeL4/H2O2 system for degradation of dyes DOI : https://doi.org/10.1111/cote.12727 En ligne : https://drive.google.com/file/d/1zCOydXOBsDdkM88Wb6Rj2dGzz1no_U8E/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40965 [article]

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Low-temperature bleaching of cotton fabric using a copper-based catalyst for hydrogen peroxide / Chong Yin in COLORATION TECHNOLOGY, Vol. 131, N° 1 (02/2015)  

[article]  inCOLORATION TECHNOLOGY > Vol. 131, N° 1 (02/2015) . - p. 66-71 Titre : Low-temperature bleaching of cotton fabric using a copper-based catalyst for hydrogen peroxide Type de document : texte imprimé Auteurs : Chong Yin, Auteur ; Yuting Huang, Auteur ; Linping Zhang, Auteur ; Hong Xu, Auteur ; Yi Zhong, Auteur ; Zhiping Mao, Auteur Année de publication : 2015 Article en page(s) : p. 66-71 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de blanchiment Basses températures Catalyseurs au cuivre Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Peroxyde d'hydrogène Le peroxyde d'hydrogène (H2O2), communément appelé eau oxygénée ou encore perhydrol (appellation industrielle), est un composé chimique liquide et visqueux, aux puissantes propriétés oxydantes (il est aussi réducteur). C'est donc un agent blanchissant efficace qui sert de désinfectant et (à haute concentration) d'oxydant ou monergol dans les fusées spatiales. Index. décimale : 667.3 Teinture et impression des tissus Résumé : Hydrogen peroxide can be catalysed to bleach cotton fibres at a temperature of 70 °C by incorporating the copper-based catalyst [Cu(TPMA)Cl]ClO4·1/2H2O in the bleaching solution. The effects of pH, temperature, and concentration of catalyst and hydrogen peroxide on bleaching effectiveness were evaluated. The effects of other transition metal complexes of tris(2-pyridylmethyl)amine were also examined. The bleaching mechanism was investigated by studying the active species. The results showed that a satisfactory whiteness index could be obtained at low temperature with the copper-based catalyst, and it also had a competitive advantage in protecting cellulose from severe chemical damage. Cu(i)TPMA(OOH)? was the active species in bleaching. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of [Cu(TPMA)Cl]Clo4.1/2H2O - Bleaching of fabrics - Mechanism analysis - Tests and measurements - RESULTS AND DISCUSSION : Effect of [Cu(TPMA)Cl]Clo4.1/2H2O concentration - Effect of the hydrogen peroxide concentration - Effect of pH - Effect of temperature - Effect of other transition metal complexes of tris(2-pyridylmethyl)amine - Copper-based catalyst residue - Comparison of the copper-based catalysis bleaching system with the traditional process - Mechanism discussion DOI : 10.1111/cote.12125 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12125 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22985 [article]

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Novel cashew nutshell liquid-based waterborne curing agents designed for high-performance and low-VOC protective epoxy coatings / Hong Xu in COATINGS TECH, Vol. 17, N° 5 (05/2020)  

[article]  inCOATINGS TECH > Vol. 17, N° 5 (05/2020) . - p. 18-27 Titre : Novel cashew nutshell liquid-based waterborne curing agents designed for high-performance and low-VOC protective epoxy coatings Type de document : texte imprimé Auteurs : Hong Xu, Auteur ; Joe Mauck, Auteur ; Fernanda Tavares, Auteur ; Anbu Natesh, Auteur ; Jing Li, Auteur Année de publication : 2020 Article en page(s) : p. 18-27 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes Essais de brouillard salin Formulation (Génie chimique) Noix de cajou et constituants Primaire (revêtement) Réticulants Réticulants en phase aqueuse Index. décimale : 667.9 Revêtements et enduits Résumé : A series of zero-volatile organic compound (VOC) waterborne epoxy curing agents based on cardanol, a non-food chain and renewable biomaterial, has been developed to meet stricter regulation, as well as high-performance requirements. This article presents the latest performance studies of applying those new Cashew Nutshell Liquid-based waterborne curing agents in typical formulations for heavy duty, industrial, and transportation coatings applications. Test results revealed that the novel waterborne curing agents enable the formulations of low-VOC (< 75 g/L) direct-to-metal primer systems with excellent performance, such as balanced fast cure and long pot life, superior adhesion, and long-term corrosion protection of numerous metal substrates. Furthermore, the influence of various solid epoxy dispersions, different cure processes, and co-solvents upon film formation, adhesion, and anti-corrosion performance are reviewed, and the challenges of improving long-term corrosion protection of waterborne primer systems over galvanized steel substrates are discussed. Note de contenu : - Part 1 : Improved application properties from new waterborne curing agents - Part 2 : Waterborne primer/mid-coat systems based on new WB-A and WB-B curing agents - Part 3 : Wet-on-wet properties - Part 4 : Formulation study - Fig. 1 : Cashew apple and nutshell - Fig. 2 : Average cardanol structure - Fig. 3 : Viscosity changes of waterborne curing agents as function of the percentage of added water - Fig. 4 : Diluation properties of WB-A with various solid epoxy dispersions - Fig. 5 : Linear dry time data ov various waterborne systems - Fig. 6 : Persoz hardness development of various waterborne systems - Fig. 7 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 1162 h, 949 h of salt-spray exposure, respectively (SA 2.5 steel substrate, bake cure, DFT = 60-75 µm) - Fig. 8 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 1162 h, 949 h and 1162 of salt-spray exposure, respectively (S-36 CRS substrate, bake cure, DFT = 75 µm) - Fig. 9 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 2018 h, 1852, and 2018 h of salt-spray exposure, respectively (AA 2024 T3 substrate, bake cure, DFT = 65 µm) - Fig. 10 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 996 h, 949 h of salt-spray exposure, respectively (stainless steel substrate, RT cure, DFT = 65 µm) - Fig. 11 : Panel images of WB-A/MC#1, WB-B/MC#2 and COM/MC#3 system after 1115 h, 949 h of salt-spray exposure, respectively (galvanized steel substrate, RT cure, DFT = 65 µm) - Fig. 13 : Photo images of the wet-on-wet application panels after 881 h of salt-spray exposure - Fig. 14 : Panel images of MC#4 system, MC#5 system and MC#5 system after 750 h of salt-spray exposure (galvanized steel substrate, RT cure, DFT = 50-60 µm) - Fig. 15 : Panel images of MC#4 system, MC#5 system and MC#7 system after 750 h of salt-spray exposure (galvanized steel substrate, RT cure, DFT = 50-60 µm) - Fig. 16 : Panel images of five waterborne primer systems containing different co-solvents after a 20-h RT aging - Table 1 : Waterborne curing agents - Typical properties - Table 2 : Typical properties of solid epoxy dispersion resins - Table 3 : Waterborne primer formulations based on WB-A, WB-B, and COM - Table 4 : Dry and wet adhesion of WB-1, WB-B, and COM system over various metal substrates - Table 5 : Waterborne primer formulations based on WB-A - Table 6 : Gloss retention of the test panels after wet-on-wet application - Table 7 : Property tests using different solvents En ligne : https://drive.google.com/file/d/1XacND7z3Wh6j3ngkyWrPxrafLk0n_1E-/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34303 [article]

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Novel CNSL-based waterborne Zn-rich primer systems for protective coatings / Hong Xu in COATINGS TECH, Vol. 15, N° 4 (04/2018)  

[article]  inCOATINGS TECH > Vol. 15, N° 4 (04/2018) . - p. 34-42 Titre : Novel CNSL-based waterborne Zn-rich primer systems for protective coatings Type de document : texte imprimé Auteurs : Hong Xu, Auteur ; Fernanda Tavares, Auteur ; Anbu Natesh, Auteur ; Jing Li, Auteur Année de publication : 2018 Article en page(s) : p. 34-42 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Application directe sur le métal Brillance (optique) Cardanol Epoxydes Essais d'adhésion Essais de brouillard salin Formulation (Génie chimique) Métaux -- Revêtements protecteurs Noix de cajou et constituants Phénalkamines Polyuréthanes Primaire (revêtement) Réticulants Revêtements -- Finition Revêtements -- Propriétés mécaniques Revêtements bi-composant Revêtements en phase aqueuse Rhéologie Zinc Index. décimale : 667.9 Revêtements et enduits Résumé : Low-VOC waterborne (WB) Zn-rich primers and high performance WB epoxy primers have been developed based on novel Cashew Nutshell Liquid (CNSL)-derived curing agents for industrial and protective coating applications. These unique WB phenalkamines were synthesized from a natural, non food chain and renewable biomaterial and could help formulate WB primer systems that meet stricter volatile organic compound (VOC) regulations as well as high performance requirerments. This article presents the latest performance studies of new phenalkamine-based WB Zn-rich primers and epoxy primers, and discusses the challenges associated with such formulations. New 2K WB Zn-rich primers were formulated with a water-free phenalkamine curing agent. The study results showed the WB Zn-rich primers had good compatibility with various commercially available solid epoxy dispersions and delivered good cure and mechanical properties ; importantly, those WB Zn-rich primers provided superb adhesion to both metal substrates and commercial polyurethane (PU) topcoats without the use of adhesion promoters. Excellent corrosion protection and good resistance to undercutting of the scribe were observed after 3000-h Q-Fog exposure. Additionally, newly developed WB high performance primers based on zero-VOC WB phenalkamines were evaluated either in combination with WB Zn-rich primers or by being directly applied over metal substrates was found that those WB epoxy primers could enhance corrosion protection as mid-coats to WB Zn-rich primers ; when being used direct-to-metal, WB epoxy primers also exhibited good mechanical and adhesion properties that benefited the overall anticorrosion performances. Note de contenu : - Part I : Waterborne (WB) Zn-rich primer study - Part II : Waterborne (WB) mid-coat systems based on new WB-C curing agent - Part III : Wet-on-wet properties - FIGURES : 1. Cashew apple and nutshell - 2. Average cardanol structure - 3. Example of phenalkamine structure - 4. Panel images of cross-hatch adhesion tests - 5. Panel images after 120h salt spray exposure - 6. Panel images after 4000-h salt spray exposure - 7. Panel images after 1200-h salt spray exposure - 8. Panel images after 2400-h salt spray exposure (surface rusts were removed via scratch pad) - 9. Panel images after 2300-h salt spray exposure (WB Zn-rich primer systems topcoated with a red iron oxide mid-coat) - 10. Panel images after scribe and wet adhesion testing - 11. Mixing viscosity changes as a function of the percentage of added water - 12. Linear dry time of various systems based on WB-C - 13. Panel images of resin 1+WB-C clear coating-system after 1200-h salt spray exposure - 14. Panel images of MC#1 and MC#2 systems after 271 and 767-h salt spray exposure - 15. Panel image of WB Zn-rich#4 primer system topcoated with MC#2 mid-coat primer after 1685-h salt spray exposure - 16. Photo images of the panels after wet-on-wet adhesion tests - TABLES : 1. Waterborne curing agents : typical properties - 2. Typical properties of solid epoxy dispersion resins - 3. WB Zn-rich primer formulations by using WB-A curing agent - 4. Mechanical properties of WB Zn-Rich primers - 5. WB mid-coat formulations based on WB-C - 6. Adhesion and anticorrosion performances of MC#2 systems as a function of mixing times - 7. Mechanical and adhesion properties of MC#2 - 8. Gloss comparison En ligne : https://drive.google.com/file/d/1QsQ8l4uOx13cFvlKXZElv8uh5js2daAr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30518 [article]

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Pursue greener / Hong Xu in EUROPEAN COATINGS JOURNAL (ECJ), (05/2023)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > (05/2023) . - p. 36-43 Titre : Pursue greener : Sustainable CNSL- based diluent for high-performance low-VOC protective coatings Type de document : texte imprimé Auteurs : Hong Xu, Auteur ; Joseph Mauck, Auteur ; James Zhao, Auteur Année de publication : 2023 Article en page(s) : p. 36-43 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Anticorrosion Diluants Epoxydes Formulation (Génie chimique) Noix de cajou et constituants Primaire (revêtement) Résistance chimique Revêtements -- Propriétés mécaniques Revêtements en phase aqueuse -- Additifs Index. décimale : 667.9 Revêtements et enduits Résumé : A novel multi-functional epoxy diluent has been developed based on natural and non-food chain cashew nutshell liquid (CNSL) to help formulators create high-performance protective coatings with a lower carbon footprint. Performance testing revealed benefits in VOC reduction and greater flexibility as well as improved resistance. Note de contenu : - Experimental - Multi-functional diluents have lower impact on reactivity - Improved chemical resistance indicate broader application possibilities - Corrosion resistance retained with multi-functional diluents - Special application as a modifier in water-borne epoxy systems - Flexible systems with good tensile strength - New diluent reduces viscosity and offers added benefits - Table 1 : Technical data of diluents used in this study - Table 2 : Technical data of curing agents in this study - Table 3 : Formulation of pigmented epoxy primers with vairous diluents - Table 4 : Formulations of water-borne epoxy screed systems En ligne : https://drive.google.com/file/d/1u9umw1Vr_3eaU46bW0TsQ03WHKnqL4jK/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39323 [article]

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Rapid decolorisation of dyeing wastewater by FeIII(2,2′:6′,2″-terpyridine)activated peroxymonosulphate / Jianing Fan in COLORATION TECHNOLOGY, Vol. 140, N° 2 (04/2024)  

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Renewable technology for high performance epoxy coatings / Donald Lawson in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 205, N° 4609 (06/2015)  

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A study of the diffusion behaviour of reactive dyes in cellulose fibres using confocal Raman microscopy / Binfan Yang in COLORATION TECHNOLOGY, Vol. 136, N° 6 (12/2020)  

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Study on the effect of different dyeing systems on the interaction of multi-component reactive dyes by Raman spectroscopy / Yamin Dai in COLORATION TECHNOLOGY, Vol. 137, N° 5 (10/2021)  

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Synthesis of a low-temperature self-crosslinking polyacrylate binder with a core-shell structure and its application in textile pigment printing / Xiaoyu Zhang in COLORATION TECHNOLOGY, Vol. 134, N° 4 (08/2018)  

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