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Auteur Rathinam Aravindhan
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Leather Processing Division CSIR - Central Leather Research Institute - Adyar, Chennai - India
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Natural sunlight assisted bentonite-ZnO mixed oxide catalyst for organic pollutant removal in leather post tanning wastewater with solar reactor / E. T. Deva Kumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 8 (08/2018)
[article]
Titre : Natural sunlight assisted bentonite-ZnO mixed oxide catalyst for organic pollutant removal in leather post tanning wastewater with solar reactor Type de document : texte imprimé Auteurs : E. T. Deva Kumar, Auteur ; Sathya Ramalingam, Auteur ; K. Thirumalai, Auteur ; Rathinam Aravindhan, Auteur ; M. Swaminathan, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2018 Article en page(s) : p. 241-247 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bentonite La bentonite est une argile colloïdale dont le nom vient de Fort Benton dans le Wyoming aux États-Unis. Connue aussi sous le terme de terre à foulon, elle peut être considérée comme une smectite, étant essentiellement constituée de montmorillonite (Na,Ca)0.33(Al,Mg)2Si4O10(OH)2·(H2O)n.(80 %) et d'argile ce qui explique sa capacité de rétention d'eau. On trouve également d'autres minéraux comme le quartz, le mica, le feldspath, la pyrite ou la calcite. Les gisements de bentonites sont d'origines volcanique et hydrothermale.
Elle possède diverses propriétés. Notamment, elle absorbe les protéines, réduit l’activité des enzymes. Les boues bentonitiques (recelant une fraction de bentonite) sont utilisées dans les travaux de terrassement, de parois moulées, du fait de leur capacité à laisser la place rapidement et facilement aux bétons coulés à leur place. Elles peuvent être ajoutées au compost.
Le numéro CAS de la bentonite est 1302-78-9.
Il existe deux types de bentonites :
La bentonite à base de sodium, qui augmente de volume lorsqu'elle est humide et qui peut absorber plusieurs fois sa masse en eau. Cette propriété est mise en valeur dans les mastics pour l'enfouissement de matières polluantes dans le sol. Elle est utilisée dans les puits de forage de pétrole et la recherche géothermique.
La bentonite à base de calcium (pascalite), qui ne possède pas ces propriétés de gonflement, a des applications parapharmaceutiques dont les résultats restent à prouver, notamment dans le domaine du système digestif. Des tribus indigènes d'Amérique du Sud, d'Afrique et d'Australie ont longtemps employé l'argile de bentonite pour cet usage.
En raison de ses fonctionnalités rhéologiques, la bentonite a un comportement thixotrope. Des petites quantités de bentonite en solution aqueuse forment un mélange visqueux, dont la viscosité baisse lorsque l'effort mécanique qui lui est appliqué augmente.
Catalyseurs
Cuirs et peaux -- Industrie -- Aspect de l'environnement
Eaux usées -- Epuration
Eaux usées -- Recyclage
Oxyde de zinc
Photocatalyse
Polluants organiques -- DétériorationIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Organic pollutants in leather post tanning wastewater were degraded by the advanced oxidation process using semiconductive photocatalysis technique. A mixed oxide nanocatalyst Bentonite-ZnO was employed for the degradation process and the same has been prepared by hydrothermal method. The morphological and optical characteristics of the nanocatalyst was well characterized by using X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Diffuse Reflectance Spectroscopy (DRS) and Fluorescence Spectrophotometer studies. The diffraction peak of the mixed oxide catalyst confirms the formation of wurzite structure of ZnO with the incorporation of bentonite clay particles. The SEM image displayed the formation of nanosized particles with porous spherical texture. The optical band gap of the bare ZnO (3.3 eV) and Bentonite-ZnO (2.5eV) catalysts were measured by DRS studies. A comparative study of photoluminescence spectra of ZnO and Bentonite-ZnO showed the suppression of charge carrier recombination in case of Bentonite-ZnO than bare ZnO. Existence of suitable charge carriers and vectorial transportation between bentonite and ZnO makes Bentonite-ZnO as an appropriate catalyst for degradation of organic pollutants present in leather post tanning liquor. The semiconductive photocatalysis on leather tannery post tanning wastewater was carried out in a specially designed pilot scale solar light reactor with Bentonite-ZnO, the results are compared with bare ZnO catalyst, where the degradation property with mixed oxide catalyst Bentonite-ZnO is better than bare ZnO. The decrease in COD with Bentonite-ZnO nanocatalyst is found to be 35.3% for three hours of continuous reaction under solar light. Such percentage of COD reduction suggest to offer this nanocatalyst treatment as preliminary step for better performance of further treatment process. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of bentonite-ZnO mixed oxide catalyst - Photocatalytic treatment of post-tanning wastewater
- RESULTS AND DISCUSSION : X-ray diffraction studies - UV-visible reflectance spectroscopy - Photoluminescence study - Effect of pH on the activity - Photocatalytic degradation under solar lightEn ligne : https://drive.google.com/file/d/1lUVJXMxJA9QXQ1m_E5gKqxJXPuJIBnDn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30840
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIII, N° 8 (08/2018) . - p. 241-247[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20115 - Périodique Bibliothèque principale Documentaires Disponible A non-destructive evaluation of fluffiness of leather / M. Muthukrishnan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 8 (08/2017)
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Titre : A non-destructive evaluation of fluffiness of leather Type de document : texte imprimé Auteurs : M. Muthukrishnan, Auteur ; S. M. Jaimohan, Auteur ; M. D. Naresh, Auteur ; R. Ramesh, Auteur ; Rathinam Aravindhan, Auteur ; N. K. Chandrababu, Auteur Année de publication : 2017 Article en page(s) : p. 263-269 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Confort
Contrôle non destructif
Cuirs et peaux -- Analyse
MesureIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Many of the comfort related properties of leather are generally assessed subjectively by experience sorters. Fluffiness is one such comfort related property of leather which not only gives volume to the leather, but provides insulation because of entrapped air. The testing method reported in this paper is a new concept in the objective measurement of the fluffiness of leather which is non-destructive in nature and should be valuable to the leather industry. Note de contenu : - Objective assessment
- Porosity
- Fluffiness mapping
- Internal structureEn ligne : https://drive.google.com/file/d/16mYPw_Dy3m7hNmNVwkAQ3CFR54-eOf8Q/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28825
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Code-barres Cote Support Localisation Section Disponibilité 19156 - Périodique Bibliothèque principale Documentaires Disponible Non-polar medium enables efficient chrome tanning / Palanisamy Thanikaivelan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 10 (10/2017)
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Titre : Non-polar medium enables efficient chrome tanning Type de document : texte imprimé Auteurs : Palanisamy Thanikaivelan, Auteur ; Selvaraj Silambaransan, Auteur ; Rathinam Aravindhan, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2017 Article en page(s) : p. 338-346 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Heptane
Solvants écologiques
Tannage au chromeIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Converting raw hides and skins into leather through chrome tanning in water medium creates huge environmental burden by contaminating the precious water resource on the one hand and discharging more chromium on the other. Here, a non-polar green solvent, heptane, alternate to water has been evaluated for chrome tanning employing both pickle-based and pickle-less method. The preceding (pre-tanning) and succeeding (post-tanning) processes were water mediated for comparison. The results show that the color and other organoleptic properties of both wet blue and crust leathers are comparable to conventional leathers. The strength and structural properties of experimental crust leathers are comparable to that of control leathers. The main benefits in switching over to heptane medium are improved exhaustion of chromium during both pickle-based and pickle-less chrome tanning, better chromium distribution and recycling ability. The process also helps in reducing the chemical oxygen demand, biological oxygen demand and total solids levels in the composite liquor significantly. Note de contenu : - MATERIALS AND METHODS : Materials - Chrome tannign in heptane medium - Determination of shrinkage temperature (T) - Analysis of chrome tanned leathers - Analysis of leachable chromium - Analysis of spent chrome liquor - Composite liquor analysis - Scanning electron microscopic analysis - Analysis of crust leathers - Studies on the recycling of the spent heptane liquor
- RESULTS AND DISCUSSION : Assessment of the wet blue leather - Chromium exhaustion/distribution and shrinkage temperature analysis - Leaching analysis - Composite liquor analysis - Evaluation of crust leathers - Recycling studiesEn ligne : https://drive.google.com/file/d/17AkqVwa6vTDcrHuGjkmR8Q2Van8eJExc/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29248
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Code-barres Cote Support Localisation Section Disponibilité 19286 - Périodique Bibliothèque principale Documentaires Disponible Salt-free chromium tanning : Practical approaches / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 1 (01/2022)
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Titre : Salt-free chromium tanning : Practical approaches Type de document : texte imprimé Auteurs : Murali Sathish, Auteur ; Rathinam Aravindhan, Auteur ; Jonnalagadda Raghava Rao, Auteur Année de publication : 2022 Article en page(s) : p. 3-9 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
DéchaulageOpération consistant à débarrasser les peaux de la chaux et des substances alcalines qui leur ont été appliquées au pelanage.
Eaux usées -- Analyse
Tannage au chrome
Tannage sans selsIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Chromium tanning finds a prominant place in leather manufacturing for permanent stabilization of hide/skin matrix. Though, it has multiple advantages in terms of high thermal stability, easy process and low cost etc., the current practice is not environmentally sustainable. Poor chromium exhaustion and TDS load generation are the major environmental threats of conventional chromium tanning systems. On the other hand, salt-free chromium tanning is identified as one of the efficient alternative approaches for hide/skin matrix stabilization. However, it has not been commercially practiced due to the several practical difficulties. In this work attempts have been made to develop a practically viable high-performance salt-free chromium tanning system using deliming liquor as tanning float and changing the order of addition of masking salt. The developed methodologies completely avoid the use of salt/basification process and it is suitable for all kinds of raw materials and tannery houses. Besides, the process enjoys 71-77% reduction in TDS load and the uptake of chromium is around 90%. The physical strength characteristics are on par with conventional process and the leathers exhibit good grain tightness and roundness. The developed methodologies are simple and do not require any specialty chemicals. Note de contenu : - MATERIALS AND METHOD : Practical approaches for salt-free chromium tanning - Analysis of wet-ble leathers - Analysis of physical strength characteristics and organoleptic properties - Analysis of wastewater
- RESULTS AND DISCUSSION : Approach-1 : Salt-free chrome tanning in deliming liquor (CTDL) - Approach-2 : Changing the order of addition of masking salts (COAMS) - Microscopic analysis - Physical strength characteristics and organoleptic properties - Analysis of wastewater
- Table 1 : State-of-the-art technologies for improved chrome tanning system
- Table 2 : Process recipe for salt-free chromium tanning in deliming liquor (CTDL)
- Table 3 : Process recipe for salt-free chromium tanning: changing the orner of addition of masking salts (COAMS)
- Table 4 : Process recipe for conventional pickle-based chrome tanning
- Table 5 : Characteristics of wastewater (Deliming to Tanning)DOI : https://doi.org/10.34314/jalca.v117i1.4690 En ligne : https://drive.google.com/file/d/1aI4xzqRNBLiq2uTszet6Vj-1H1yXO16p/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37025
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Code-barres Cote Support Localisation Section Disponibilité 23238 - Périodique Bibliothèque principale Documentaires Disponible Studies of ethiopian sheepskins as an opportunity for value addition, part II : optimization and characterization of wanke upper and garment leather / H. Mohammed in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 5 (05/2014)
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Titre : Studies of ethiopian sheepskins as an opportunity for value addition, part II : optimization and characterization of wanke upper and garment leather Type de document : texte imprimé Auteurs : H. Mohammed, Auteur ; G. Aysanew, Auteur ; Rathinam Aravindhan, Auteur ; Jonnalagadda Raghava Rao, Auteur ; Chandra Babu Narasimhan Kannan, Auteur Année de publication : 2014 Article en page(s) : p. 161-169 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux de moutons
Vêtements en cuirIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Ethiopian tanners face a shortage of raw material input for the production of leather. The government strategically planned for importing raw skins from neighboring countries and also for effective utilization of available raw material resources in the country. The meat of Wanke sheep is in high demand in international markets, but the skin commands low price not only due to low availability but also less demand by tanners due to natural problems associated with the skin. Hence, tanners treat the skin as a reject. The problems of Wanke skin include high natural fat deposition, thin substance and low strength. Usually, leathers made out of Wanke skins have low selections compared to Ethiopian sheep skins and are mainly utilized for making lining leather. In this work, efforts have been made to develop a process technology for making high value leathers with improved properties from Wanke sheepskin. Note de contenu : - MATERIALS AND METHODS : Process design and standardization - Physical characterization of the skin
- RESULT AND DISCUSSION : Processing strategy - Organoleptic properties - Pilot scale trials for making wanke garment and ladies upper leathersEn ligne : https://drive.google.com/file/d/1sZ5yZi_0u5m7oFbmIpCIcjFLSWCtSUiT/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21288
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Code-barres Cote Support Localisation Section Disponibilité 16230 - Périodique Bibliothèque principale Documentaires Disponible Studies on combination tanning based on henna and oxazolidine / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 10 (10/2009)
PermalinkStudies on ethiopian sheep skins as an opportunity for value addition part I : histological, microscopic and chemical characterization of abyssinian and wanke sheepskins / H. Mohammed in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 3 (03/2014)
PermalinkStudies on tara-phosphonium combination tannage : approach towards a metal free eco-benign tanning system / Rathinam Aravindhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CX, N° 3 (03/2015)
PermalinkStudies on the development of a multi-functional syntan / R. Nataraj in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIV, N° 7 (07/2009)
PermalinkStudies on the ethiopian camel hides for their suitability for making leather / M. Belay in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 2 (02/2019)
PermalinkStudies on the fabrication of hydrophobic coating incorporating bentonite clay and its effect on the physical properties of the finished leather / Renganath Rao Ramesh in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 2 (02/2023)
PermalinkStudies on the henna-glutaraldehyde combination tanning system / A. E. Musa in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 3 (03/2011)
PermalinkStudies on the use of bi-functional enzyme for leather making / Gladstone Christopher Jayakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 12 (12/2016)
PermalinkSuccessful use of remnant : attractive reversible grain pattern / Murali Sathish in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXII, N° 1 (01/2017)
PermalinkSynergistic effect of pseudomonas aerunginosa and escherichia coli in the biodegradation of phenolic compounds / Rathinam Aravindhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIII, N° 7 (07/2008)
PermalinkTannic acid-phosphonium combination : A versatile chrome-free organic tanning / N. N. Fathima in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 5 (05/2006)
PermalinkUse of ternary solvent (water - ethanol - ethyl acetate) medium for leather processing : a possible paradigm change / Bhargavi Narayana Reddy Gari in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXI, N° 7 (07/2016)
PermalinkUtilization of calcium alginate beads as adsorbent for removal of dyes from tannery wastewaters / Rathinam Aravindhan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CI, N° 6 (06/2006)
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