Aswan clay as sorbent for removal of Cr(III) and Cr(VI) from synthetic solution and tannery wastewater / O. A. Mohamed in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 5 (09-10/2005)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 5 (09-10/2005) . - p. 204-209 Titre : Aswan clay as sorbent for removal of Cr(III) and Cr(VI) from synthetic solution and tannery wastewater Type de document : texte imprimé Auteurs : O. A. Mohamed, Auteur ; S. A. Sayed, Auteur ; H. S. Mohamady, Auteur ; N. H. El-Sayed, Auteur Année de publication : 2005 Article en page(s) : p. 204-209 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Adsorption Argile Caractérisation Chrome trivalent -- Absorption Déchets industriels -- Elimination Eaux usées -- Epuration Eaux usées -- Teneur en chrome trivalent Isotherme d'adsorption Tannage -- Déchets Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The sorption on Aswan clay of Cr(III) and Cr(VI) from synthetic solution and tannery wastewater has been studied. The clay has been characterized and used for the removal of chrome. The adsorption was studied as a function of pH, contact time, adsorbate concentration, loading, temperature and interfering ions. The equilibrium data fitted well with a Freundlich adsorption isotherm, where the Kf and n values are 2.08 - 4.6 for Cr(VI), 14.45 - 2.5 for Cr(III) and 8.31 - 2.4 for tannery wastewater. In our study we choose Aswan clay, which is low in cost, to aid the economy of the process. Adsorption studies indicated that chrome removal is 77% for CrVI, 90% for CrIII and 75% for a tannery wastewater. Note de contenu : - MATERIALS AND METHODS : Adsorbents - CHARACTERISTICS OF ASWAN CLAY : X-ray diffraction analysis - Adsorbates - Chemicals - Instrumentation - Methods - RESULTS AND DISCUSSION : Effect of pH - Effect of agitation time - Effect of adsorbent loading - Effect of adsorbate concentration - Effect of temperature - Effect of some anions on chromium (VI) removal - ADSORPTION ISOTHERMS En ligne : https://drive.google.com/file/d/1TtT-yFTYThWUEKw5oSLffFro0XdfeHyr/view?usp=share [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39231 [article]

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Determination of chromium(III) and chromium(VI) in water by low Pressure ion chromatography coupled with inductively coupled plasma-mass spectrometry / Jin Haochen in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 4 (07-08/2016) . - p. 182-185 Titre : Determination of chromium(III) and chromium(VI) in water by low Pressure ion chromatography coupled with inductively coupled plasma-mass spectrometry Type de document : texte imprimé Auteurs : Jin Haochen, Auteur ; Zhang Xinshen, Auteur ; Wan Xu, Auteur ; Wang Junwei, Auteur Année de publication : 2016 Article en page(s) : p. 182-185 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie Eaux usées -- Analyse Eaux usées -- Teneur en chrome hexavalent Eaux usées -- Teneur en chrome trivalent Spectrométrie de masse Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A novel method using low pressure ion chromatography coupled with inductively coupled plasma-mass spectrometry (LPLC-ICP-MS) has been developed for the determination of water-soluble chromium(III) and chromium(VI) in waste water. The low pressure anion exchange column used in this system contained quaternary ammonium groups, which could separate the Cr(III) from Cr(VI). The ICP-MS was used as the detector in this coupled system to detect the concentration of chromium. The linear range of this method was 10.0ng.L-1~1.0mg•L-1 ; the detection limit of Cr(III) was 3.5ng.L-1, Cr(VI) was 9.8ng•L-1(pH=7) ; the precision of Cr(III) was 2.1%, Cr(VI) was 4.6% (n=6). Compared with National Standard Method of China reste the error was ±6%. Note de contenu : - EXPERIMENTAL PROCEDURE : Reagents - Apparatus - Analytical procedure - RESULTS AND DISCUSSION : Composition and concentration of mobile phase - Flow velocity of mobile phase - Potential of hydrogen (pH) of mobile phase - Comparison of different mass to charge ration (m/z) - Reproductibility calibration curve and detection limit En ligne : https://drive.google.com/file/d/1nzvOrJ0TW5q3z2OdZFkOINBY0U6bsi2y/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26795 [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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Electrochemical separation of chromium containing tannery waste liquid / Zheng Haonan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 3 (05-06/2020)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 104, N° 3 (05-06/2020) . - p. 145-150 Titre : Electrochemical separation of chromium containing tannery waste liquid Type de document : texte imprimé Auteurs : Zheng Haonan, Auteur ; Cao Shengkui, Auteur ; Yang Wenhua, Auteur ; Zhihua Shan, Auteur Année de publication : 2020 Article en page(s) : p. 145-150 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eaux usées -- Décontamination Eaux usées -- Teneur en chrome hexavalent Eaux usées -- Teneur en chrome trivalent Electrochimie Electrolyse Énergie -- Consommation Membranes échangeuses d'ions Séparation (technologie) Tannage -- Déchets Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Comparing the electrolysis results of a chromium sulphate standard solution with cation and anion membranes, it was found that electrolysis with the cation membrane could remove more chromium. After electrolysis with the cation membrane of the mixed waste liquid containing chromium from chrome tanning, washing, chrome retanning and neutralisation, Cr(OH)3 could be precipitated, the Cr3+ solution showed a reduced concentration at the cathode, and a Cr6+ solution could be obtained at the anode. The results of this study show that cyclic electrolysis of such liquid waste containing chromium at the cathode can increase Cr(OH)3 precipitation and reduce the Cr6+ concentration at the anode. Note de contenu : - PRINCIPLE OF CHROMIUM REMOVAL BY AN ELECTROCHEMICAL METHOD - EXPERIMENTAL METHOD : Main reagents - Main instruments and equipment - Determination of the chromium content - Preparation of the waste liquid containing chromium - Electrolysis experiment - EXPERIMENTAL RESULTS AND DISCUSSION : Electrolysis of the chromium sulphate standard solution with an anion membrane - Double cell electrolysis of chromium sulphate standard solution with a cation membrane - Double cell electrolysis of waste liquid containing chromium with a cation membrane - Results of the cyclic electrolysis of waste liquid containing chromium in the cathode - Electrical energy consumption of one cycle of electrolysis En ligne : https://drive.google.com/file/d/1j6UDp1T1ywy_Th55yvNEtuT1g3TvrLsI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34244 [article]

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The environmental effects of chromium in tannery effluents / Stephen A. J. Shivas in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIII (Année 1978)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXIII (Année 1978) . - p. 370-377 Titre : The environmental effects of chromium in tannery effluents Type de document : texte imprimé Auteurs : Stephen A. J. Shivas, Auteur Année de publication : 1978 Article en page(s) : p. 370-377 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Boues résiduaires Chrome trivalent Chrome trivalent -- Oxydation Cuirs et peaux -- Industrie -- Aspect de l'environnement Eaux usées -- Teneur en chrome trivalent Environnement -- Etudes d'impact Membranes échangeuses d'ions Sols -- Chimie Sols -- Teneur en chrome Solubilité Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The chrome in tannery effluents is in the relatively nontoxic trivalent state, and not in sufficient concentrations to inhibit municipal sewage treatment. Municipal sludges applied to agricultural land could safely contain up to 500 ppm chrome. The final limitation of 112 ppm of chrome in soif is not realistic, since natural agricultural soils throughout the world contain more chrome than this. Adding chrome to the soil may even be beneficial, since many animal diets are chrome-deficient. Most leather is now tanned with chromium salts or vegetable and synthetic tannins and combinations of these (although considerable amounts of zirconium, alum, and glutaraldehyde are also in use). Since chromium is so widely used, it is important to consider the effects on the environment of the chemical state and concentrations in which it is discharged in tannery effluents and sludges. Note de contenu : - Chrome valencies - Properties of trivalent chrome - Solubility - Membrane permeability - Form of trivalent chrome in tannery effluent - Safe levels of trivalent chrome in biological oxidation - Effect of trivalent chrome in the soil - Chrome content in soils throughout the world - An alernative to tannery sludge disposal on agricultural land - Table 1 : Chromum content of digestedsludge from municipal sewage in sweden and Denmark En ligne : https://drive.google.com/file/d/1YWuHS1ywkVdcWCklq73zuP3ladianXaG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=41156 [article]

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