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Fabrication of hierarchical layered double hydroxide framework on aluminum foam as a structured adsorbent for water treatment / Shan He in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 285–291 Titre : Fabrication of hierarchical layered double hydroxide framework on aluminum foam as a structured adsorbent for water treatment Type de document : texte imprimé Auteurs : Shan He, Auteur ; Yufei Zhao, Auteur ; Min Wei, Auteur Année de publication : 2012 Article en page(s) : pp. 285–291 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydroxide  Adsorbent Résumé : A hierarchical Mg–Al layered double hydroxide (LDH) framework has been fabricated via the in situ crystallization technique on aluminum foam, which can be used to remove heavy metal ion Cr(VI) and anionic dye (Remazol Brilliant Blue R, denoted as RBBR) from aqueous solutions. The as-prepared LDH/Al-foam displays flowerlike LDH microspheres composed of numerous LDH nanoplatelets, which was confirmed by XRD and SEM. The sorption kinetics of hierarchical LDH framework for Cr(VI) was appropriately described by a pseudo-second-order model. Sorption isotherms of both Cr(VI) and RBBR were also studied, which can be fitted by the Langmuir model more satisfactorily than the Freundlich one. It was found that the sorption capacities (qMAX) of the LDH framework reached 27.8 mg g–1 for Cr(VI) and 212.8 mg g–1 for RBBR, respectively, much larger than those of the corresponding LDH powder sample (21 mg g–1 for Cr(VI) and 166.7 mg g–1 for RBBR). Furthermore, the hierarchical LDH framework exhibits excellent sorption–regeneration performances compared with the powder sample, which facilitates its repeatable and cyclic usage over a long period. Owing to the high sorption capacity, low-cost preparation, convenient manipulation, and easy regeneration of the hierarchical LDH framework, it can be potentially used as a structured adsorbent in the field of water treatment. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2015894 [article] Fabrication of hierarchical layered double hydroxide framework on aluminum foam as a structured adsorbent for water treatment [texte imprimé] / Shan He, Auteur ; Yufei Zhao, Auteur ; Min Wei, Auteur . - 2012 . - pp. 285–291. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 285–291 Mots-clés : Hydroxide  Adsorbent Résumé : A hierarchical Mg–Al layered double hydroxide (LDH) framework has been fabricated via the in situ crystallization technique on aluminum foam, which can be used to remove heavy metal ion Cr(VI) and anionic dye (Remazol Brilliant Blue R, denoted as RBBR) from aqueous solutions. The as-prepared LDH/Al-foam displays flowerlike LDH microspheres composed of numerous LDH nanoplatelets, which was confirmed by XRD and SEM. The sorption kinetics of hierarchical LDH framework for Cr(VI) was appropriately described by a pseudo-second-order model. Sorption isotherms of both Cr(VI) and RBBR were also studied, which can be fitted by the Langmuir model more satisfactorily than the Freundlich one. It was found that the sorption capacities (qMAX) of the LDH framework reached 27.8 mg g–1 for Cr(VI) and 212.8 mg g–1 for RBBR, respectively, much larger than those of the corresponding LDH powder sample (21 mg g–1 for Cr(VI) and 166.7 mg g–1 for RBBR). Furthermore, the hierarchical LDH framework exhibits excellent sorption–regeneration performances compared with the powder sample, which facilitates its repeatable and cyclic usage over a long period. Owing to the high sorption capacity, low-cost preparation, convenient manipulation, and easy regeneration of the hierarchical LDH framework, it can be potentially used as a structured adsorbent in the field of water treatment. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2015894

SOx oxidation and adsorption by CeO2/MgO / Lei Jiang in Industrial & engineering chemistry research, Vol. 50 N° 8 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4398–4404 Titre : SOx oxidation and adsorption by CeO2/MgO : synergistic effect between CeO2 and MgO in the fluid catalytic cracking process Type de document : texte imprimé Auteurs : Lei Jiang, Auteur ; Min Wei, Auteur ; Xiangyu Xu, Auteur Année de publication : 2011 Article en page(s) : pp. 4398–4404 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : SOx  Oxidation  Fluid  catalytic Résumé : The sulfur-transfer catalyst plays an important role in the fluid catalytic cracking (FCC) process through which the sulfur oxides (SOx) are removed from flue gas. This work reports the synergistic effect between CeO2 and MgO on the SOx oxidation and adsorption in the FCC process. The CeO2 acts as the oxidation promoter, while MgO is the active phase for SOx adsorption. The influence of crystal size on the synergistic effect between CeO2 and MgO on the SOx oxidation and adsorption was investigated. It was observed that the initial apparent SOx pick-up rate decreases with the increase in the CeO2 crystal size, while the maximum SOx oxidation and adsorption capacity decreases with the increase in the MgO crystal size. Therefore, this work provides a detailed understanding of the synergistic effect between CeO2 and MgO for the SOx pick-up, which is crucial for the rational design and preparation of the sulfur-transfer catalysts. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102243y [article] SOx oxidation and adsorption by CeO2/MgO : synergistic effect between CeO2 and MgO in the fluid catalytic cracking process [texte imprimé] / Lei Jiang, Auteur ; Min Wei, Auteur ; Xiangyu Xu, Auteur . - 2011 . - pp. 4398–4404. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4398–4404 Mots-clés : SOx  Oxidation  Fluid  catalytic Résumé : The sulfur-transfer catalyst plays an important role in the fluid catalytic cracking (FCC) process through which the sulfur oxides (SOx) are removed from flue gas. This work reports the synergistic effect between CeO2 and MgO on the SOx oxidation and adsorption in the FCC process. The CeO2 acts as the oxidation promoter, while MgO is the active phase for SOx adsorption. The influence of crystal size on the synergistic effect between CeO2 and MgO on the SOx oxidation and adsorption was investigated. It was observed that the initial apparent SOx pick-up rate decreases with the increase in the CeO2 crystal size, while the maximum SOx oxidation and adsorption capacity decreases with the increase in the MgO crystal size. Therefore, this work provides a detailed understanding of the synergistic effect between CeO2 and MgO for the SOx pick-up, which is crucial for the rational design and preparation of the sulfur-transfer catalysts. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102243y