Facile preparation of hierarchical porous polydopamine microspheres for rapid removal of chromate from the wastewater / Lin Xiang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 10 p. Titre : Facile preparation of hierarchical porous polydopamine microspheres for rapid removal of chromate from the wastewater Type de document : texte imprimé Auteurs : Lin Xiang, Auteur ; Jiayou Lin, Auteur ; Qin Yang, Auteur ; Shaojian Lin, Auteur ; Sheng Chen, Auteur ; Bin Yan, Auteur Année de publication : 2020 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Chrome hexavalent Chrome trivalent Eaux usées -- Décontamination Microsphères Polydopamine Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Cr(VI) containing industrial wastewaters are highly toxic and carcinogenic, and severely threats living creatures and the environment. Therefore, it is highly desired yet challenging to develop an available and economical adsorbent for simultaneously detoxifying Cr(VI) anions to Cr(III) ions and removing them from the wastewater. Here we propose a facile method for rapid removal of Cr(VI) ions from the wastewater by using a synthetic polydopamine microsphere (PPM) adsorbent with hierarchical porosity. The as-prepared PPM exhibits high Cr(VI) removal capacity of 307.7 mg/g and an outstanding removal efficiency. They can effectively decrease the Cr(VI) concentration to lower than 0.05 mg/L well below the limits for drinking water standard of WHO regulations in 60 s at pH 2. More importantly, PPMs can reduce the lethal Cr(VI) anions to Cr(III) ions with low toxicity, and simultaneously immobilize them on the matrices of PPMs. Note de contenu : - MATERIALS AND METHODS : Material - Synthesis of PPMs - PPMs material characterization - Cr(VI) removal experiments - RESULTS AND DISCUSSION : Synthesis and characterizations of the PPMs - High Cr(VI) removal capacity of PPMs - Rapid Cr(VI) adsorption kinetics of PPMs - Highly selectivity of PPMs to Cr(VI) from complex wastewater - Easy regeneration and recovery of adsorbents for recycling - Cr(VI) adsorption mechanisms of PPMs via reduction and immobilization - Table 1 : Fitting parameters of thermodynamic adsorption under different temperatures - Table 2 : The thermodynamic parameters of △H0, △S0 and △G0 - Table 3 : Kinetic adsorption model fitting data DOI : https://doi.org/10.1186/s42825-020-00036-x En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00036-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37455 [article]

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