Application of Mn-doped mesoporous TiO2 in tannery wastewater treatment / Xiu He in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 6 (11-12/2019)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 6 (11-12/2019) . - p. 318-322 Titre : Application of Mn-doped mesoporous TiO2 in tannery wastewater treatment Type de document : texte imprimé Auteurs : Xiu He, Auteur ; Xiaocong Wang, Auteur ; Baozhen Cheng, Auteur ; Shan Cao, Auteur ; Jianfei Zhou, Auteur Année de publication : 2019 Article en page(s) : p. 318-322 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Dioxyde de titane Eaux usées -- Epuration Manganèse Matériaux mésoporeux Photocatalyse Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Treatment of tannery wastewater is a challenging task because of its complex components, deep colour and high concentration of suspended solids. This study aims to develop a treatment system that can effectively reduce the pollutants in tannery wastewater to an environmentally acceptable level. Manganese (Mn)-doped mesoporous titanium dioxide (T102) was successfully synthesized via a sol-gel method using butyl titanate as a precursor and surfactant P123 as a template. When the dosage of Mn in the mesoporous Ti02 was 0.4%, the degradation rate of organic pollutants was nearly 90% after 8 hours of treatment with metal halide. The as-prepared products showed excellent photocatalytic activity even sunlight was used as an illuminant. The degradation rate of organic pollutants reached 87.5% when sunlight was used for excitation. Results of this study can be used as a reference in purifying various types of industrial wastewater. Note de contenu : - MATERIALS AND METHODS : Chemicals - Preparation of Mn-doped mesoporous TiO3 - Characterisation - Photocatalytic activity - RESULTS AND DISCUSSION : Preparation and characterisation of Mn-doped mesoporous Tio2 En ligne : https://drive.google.com/file/d/1eXAhb-b6ASSAPbNVsMuEIHBX4Y6ikldm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33210 [article]

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A cleaner deliming process using sodium gluconate for reduction in nitrogen pollution in leather manufacture / Yunhang Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 1 (01/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 1 (01/2018) . - p. 19-25 Titre : A cleaner deliming process using sodium gluconate for reduction in nitrogen pollution in leather manufacture Type de document : texte imprimé Auteurs : Yunhang Zeng, Auteur ; Ya-Nan Wang, Auteur ; Ying Song, Auteur ; Jianfei Zhou, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 19-25 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux Cuirs et peaux -- Analyse Décapage Gluconate de sodium Le gluconate de sodium est un composé organique de formule brute Na1C6H11O7. C'est un sel sodique de l'acide gluconique. Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ammonium salts used in deliming process are the main source of high ammonia nitrogen (NH3-N) concentration in tannery wastewater. To reduce nitrogen pollution in leather manufacture without sacrificing quality of resultant leathers, a cleaner deliming agent prepared by mixing sodium gluconate (60 wt.%), citric acid (15 wt.%) and ammonium sulfate (25 wt.%) together was employed for deliming limed cattle hide pelt. The results indicated that this cleaner deliming agent penetrated the whole pelt very quickly and successfully formed a buffer system of pH 8-9 with the alkali from liming, which prevented acid swelling and damage to the fiber network of pelt. The delimed pelt had a cleaner grain surface with a higher extent of calcium removal than the conventional ammonium delimed pelt. The concentrations of NH3-N and total nitrogen (TN) in the cleaner deliming effluent were dramatically reduced by 86% and 79%, respectively. Moreover, the cleaner deliming scarcely affected subsequent bating process with trypsin. Note de contenu : - EXPERIMENTAL : Materials - Experimental and control deliming and bating processes - Analyses of penetration of deliming agents - Determination of deliming float pH - Determination of concentration of hydroxyproline (Hyp) in deliming effluent - SEM and EDS analyses of delimed pelt - Determination of concentrations of NH3-N, TN, TOC, COD and BOD5 in deliming effluent - Determination of concentrations of protein and Hyp in bating effluent - Observation of mass transfer of trypsin in bated pelt - RESULTS AND DISCUSSION : Penetration and pH buffering capacity of deliming agent - Extent of calcium removal from pelt - Effect of deliming on bating - Environmental benefits En ligne : https://drive.google.com/file/d/15pYiNAZ3f0fxj-aCNZveRUGAmKAQ-gNM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29748 [article]

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Construction of a chrome-free tanning system based on highly-oxidized starch–zirconium complexes / Yue Yu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 3 (03/2022)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVII, N° 3 (03/2022) . - p. 87-95 Titre : Construction of a chrome-free tanning system based on highly-oxidized starch–zirconium complexes Type de document : texte imprimé Auteurs : Yue Yu, Auteur ; Hui Wang, Auteur ; Ya-Nan Wang, Auteur ; Jianfei Zhou, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : p. 87-95 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amidons Biodégradation Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux -- Propriétés physiques Eaux usées -- Analyse Granulométrie Post-tannage Taille des particules Tannage chrome free Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en Å“uvre par exemple Chrome-Végétal ou Chrome-Synthétique Zirconium Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chrome-free leather manufacture is one of the major focuses of leather industry. In this work, a chrome-free tanning system based on highly-oxidized starch–zirconium complexes (HOS–Zr) was constructed. Particle size and charge properties analyses revealed that the small size (2.5 nm) and the low cationic species content (45.1%) of HOS–Zr at low pH facilitated its uniform penetration in leather at the initial stage of tanning, and the large size (89–169 nm) and the high cationic species content (77.5%) of HOS–Zr after basification contributed to its stable crosslinking between collagen fibers. A 3% HOS–Zr offer (based on the weight of ZrO2) imparted wet white with sufficient tanning effect. The physical properties of HOS–Zr crust leather were remarkably better than those of lactic acid–zirconium crust leather and were comparable to those of chrome crust leather. Wastewater in HOS–Zr tanning system showed a reduction in TOC load by 40.0% and higher biodegradability compared with chrome tanning system. As a result, this work provided a practical and sustainable approach to eliminate chrome in leather manufacture. Note de contenu : - EXPERIMENTAL : Materials - Optimization of HOS-Zr tanning system - Particle size analysis - Charge properties analysis - Tanning trials - RESULTS AND DISCUSSION : Optimization of HOS-Zr-tanning system - Particle soze of HOS-Zr - Charge properties of Zr complexes - Comprehensive evaluation of the tanning performance of HOS-Zr - Table 1 : La-Zr and HOS-Zr tanning process - Table 2 : conventional chrome tanning process - Table 3 : Post-tanning process - Table 4 : Properties of tanned leathers - Table 5 : Physical properties o fcrust leathers - Table 6 : Pollution loads in tanning and post-tanning wastewaters (unit: kg/ton of pickled hide) - Table 7 : Biodegradability of tanning and post-tanning wastewaters En ligne : https://drive.google.com/file/d/1VmQIPtNQ6vZECS63DGWb4kMJcZEwDYNN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37599 [article]

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Effect of co-combustion of tannery sludge and coal on the migration of Cr in the bottom ash / Jianfei Zhou in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 98, N° 1 (01-02/2014)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 98, N° 1 (01-02/2014) . - p. 35-41 Titre : Effect of co-combustion of tannery sludge and coal on the migration of Cr in the bottom ash Type de document : texte imprimé Auteurs : Jianfei Zhou, Auteur ; Ya-Nan Wang, Auteur ; Xuepin Liao, Auteur ; Wenhua Zhang, Auteur ; Bi Shi, Auteur Année de publication : 2014 Article en page(s) : p. 35-41 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Boues résiduaires -- Analyse Chrome Combustion Déchets industriels -- Elimination Tannage -- Déchets Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The feasibility of co-combustion of tannery sludge and coal as well as mono-combustion of the sludge was analyzed by tracking the migration of Cr in the sludge and its bottom ash. Most of the Cr was found to be fixed in the bottom ash during combustion when the temperature was not over 600°C. For further analysis of the migration behaviour of Cr after combustion, speciation of Cr in bottom ash was determined by BCR (Community Bureau of Reference) method. It was found that a great deal of Cr was converted from oxidizable fraction in sludge to exchangeable fraction in bottom ash. Moreover, acid leaching test indicated Cr stabilized in the original sludge became easier to leach from the bottom ash. These facts suggest the environmental risk of Cr in the ash is much higher than in the original sludge. Therefore, co-combustion of sludge and coal without any further treatment is not a feasible way to dispose of Cr enriched tannery sludge. Note de contenu : - EXPERIMENTAL PROCEDURES : Materials - Sample preparation - Characteristics of tannery sludge - Co-combustion of tannery sludge and coal - Analytical methods - RESULTS AND DISCUSSION : Characteristics of tannery sludge - Contents of Cr in bottom ashes - Speciation of Cr in bottom ashes En ligne : https://drive.google.com/file/d/1Pjkbk-U_COgMr5D--vf1eALaOW3_ItQE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21017 [article]

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Effect of leather chemicals on Cr(III) removal from post tanning wastewater / Yuling Tang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 3 (03/2018)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 3 (03/2018) . - p. 74-80 Titre : Effect of leather chemicals on Cr(III) removal from post tanning wastewater Type de document : texte imprimé Auteurs : Yuling Tang, Auteur ; Jianfei Zhou, Auteur ; Yunhang Zeng, Auteur ; Wenhua Zhang, Auteur ; Bi Shi, Auteur Année de publication : 2018 Article en page(s) : p. 74-80 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Coagulation Composés complexes Cuirs et peaux Déchets industriels -- Elimination Eaux usées -- Epuration Eaux usées -- Teneur en chrome trivalent Polyacryliques Produits chimiques Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The effect of typical leather chemicals on removal of Cr(III) from tannery post tanning wastewater by PAC coagulation was investigated. It was found that all the leather chemicals investigated could form complexes with Cr(III) through their anionic hydrophilic groups. The determinations of fluorescence quenching titration indicated that the Cr(III)-complexing ability of these anionic hydrophilic groups was in the sequence of phenolic hydroxyl of vegetable tannins and syntans > carboxyl of acrylic resins > sulfonic acid group of fatliquors and dyes. The complexes formed had higher hydrophobicity because a part of anionic hydrophilic groups of leather chemicals were blocked. The Cr(III) complexes with vegetable tannins, syntans and dyes were in the form of hydrophobic colloid or particle due to both the blocking effect of hydrophilic groups and the strong hydrophobicity of benzene ring, which favored the removal of Cr(III) from post tanning wastewater by coagulation (removal extent 82%-99%). But the Cr(III) complexes with acrylic resins existed as water-soluble pieces, probably because a part of free carboxyl group still kept on the polymer chain at reaction equilibrium, and acrylic resins had no structure/group with hydrophobicity as strong as benzene ring. As a result, Cr(III) was difficult to be removed from wastewater when acrylic resins existed (removal extent <60%). That is, the formation of Cr(III)-acrylic resin complexes is the major obstacle in removing Cr(III) effectively from post tanning wastewater. Note de contenu : - EXPERIMENTAL : Materials - Preparation of simulated post tanning wastewater - Removal of Cr(III) and TOC from the simulated post tanning wastewater by coagulation - Analysis of Cr(III)-binding ability of model post tanning chemicals - RESULTS AND DISCUSSION : Effect of status of Cr(III) complexes on removal of Cr(III) from wastewater - Cr(III)-binding abilities of model post tanning chemicals En ligne : https://drive.google.com/file/d/1U4KjsYPeV6p_gmwFNhu_sKQ9PlhYvsev/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30273 [article]

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Fabrication, characterization and tanning performances investigation of a novel epoxide / Xiaoyan Pang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 8 (08/2018)  

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Flocculation behaviors of collagen protein-Al(III) composite flocculant / Ruiqin Li in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 2 (02/2014)  

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Insight into the correlations between fiber dispersion and physical properties of chrome tanned leather / Xiu He in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 1 (01/2020)  

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Inverse chrome tanning technology : A practical approach to minimizing Cr(III) discharge / Yue Yu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 5 (05/2020)  

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Investigations on the general properties of biomass-based aldehyde tanned sheep fur for its selective post-tanning processing / Wei Ding in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

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Modification of faltiquored split by in-situ polymerization of n-butyl-methacrylate / Xu Weixing in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 2 (03-04/2017)  

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Molecular level understanding of the stability difference in collagen induced by chromium sulfate and aluminum sulfate / Weimo Han in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 101, N° 6 (11-12/2017)  

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Neutral protease assisted low-sulfide hair-save unhairing based on pH-sensitivity of enzyme / Yunhang Zeng in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 9 (09/2016)  

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Nutrient balance in aerobic biological treatment of tannery wastewater / Jianfei Zhou in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 5 (05/2014)  

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Optimization and application of chromium-resistant collagenase production by Serratia sp. G / Bijun Zheng in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 108, N° 2 (03-04/2024)  

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Suitability of pore measurement methods for characterizing the hierarchical pore structure of leather / Xiu He in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 2 (02/2019)  

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Surface charge and isoelectric point of leather : a novel determination method and its application in leather making / Ya-Nan Wang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 7 (07/2017)  

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Tannery wastewater treatment : conventional and promising processes, an updated 20-year review / Jun Zhao in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

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The reinforcement of leather split by constructing an interpenetrating network via in-situ recombination of PVA / Xu Weixing in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 8 (08/2018)  

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