Homogeneous Zr and Ti co-doped SBA-15 with high specific surface area : preparation, characterization and application / Qiang Taotao in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 1 (Année 2019)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 1 (Année 2019) . - 12 p. Titre : Homogeneous Zr and Ti co-doped SBA-15 with high specific surface area : preparation, characterization and application Type de document : texte imprimé Auteurs : Qiang Taotao, Auteur ; Yajuan Xia, Auteur ; Zhao Jing, Auteur Année de publication : 2019 Article en page(s) : 12 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Adsorption Caractérisation Chimie analytique Composés inorganiques -- Synthèse Santa Barbara Amorphous-15 Santa Barbara Amorphous-15 (SBA-15) is a highly stable mesoporous silica sieve developed by researchers at the University of California at Santa Barbara. It gets it high hydrothermal and mechanical stability from a framework of uniform hexagonal pores that feature a narrow pore-size distribution and a tunable pore diameter of 5nm to 15nm, but, most significantly, from its relatively thick walls, which range between 3.1nm and 6.4nm. SBA mesoporous silica 15 has a high internal surface area, which lends itself to various applications, including environmental adsorption and separation, advanced optics, and catalysts. (ACS Materials) Surfaces (technologie) Tannage Thermodynamique Titane Zirconium Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A facile synthesis procedure is proposed to prepare homogeneous Zr and Ti co-doped SBA-15 (Zr-Ti-SBA-15) with high specific surface area of 876.0 m2 g− 1. Based on “masking mechanism” from tanning, lactic acid was used as masking agent to obtain the uniform distribution of Zr and Ti species in the SBA-15 framework. The obtained materials were characterized by powder X-ray diffraction (XRD), nitrogen adsorption-desorption isotherms, scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron (XPS). The results reveal that in mesoporous materials, the presence of lactic acid gives rise to the uniform distribution of Zr and Ti species. The adsorption equilibrium and kinetic studies of Zr-Ti-SBA-15 materials show that the adsorption process conforms to the Langmuir isotherm and pseudo-second-order kinetic model, respectively. Regenerational experiments show that the Zr-Ti-SBA-15 displays a significant adsorption ability for methylene blue (MB) (up to 291.6 mg/g), along with good reusability, indicating promising potentials of commercialization. Methodologically, this work provides a wide range of possibilities for further development of SBA-15 based on bimetallic and sewage disposal. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of Zr-Ti -SBA-15 - Characterization of Zr-Ti-SBA-15 - Adsorption measurement - Regeneration experiment - RESULTS AND DISCUSSION : XRD characterization - N2 adsorption-desorption - TEM and SEM characterization - EDS characterization - XPS characterization - Adsorption measurement of Zr-Ti-SBA-15 - Kinetic analysis - Adsorption isotherms - Thermodynamics analysis - Regeneration experiment of Zr-Ti-SBA-15 - Table 1 XRD texture properties of the samples - Table 2 Textural parameters of the samples - Table 3 The pseudo-first-order and pseudo-second-order kinetic model parameters for MB adsorption on Zr-Ti-SBA-15 composite - Table 4 Isothermal parameters for MB adsorption on Zr-Ti-SBA-15 composite - Table 5 Comparison of the maximum adsorption capacity of different adsorbents - Table 6 The values of thermodynamics parameters for MB adsorption on Zr-Ti-SBA-15 - Table 7 The leaching data of Zr and Ti during desorption process DOI : https://doi.org/10.1186/s42825-019-0004-x En ligne : https://link.springer.com/content/pdf/10.1186/s428 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36946 [article]

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