Microwave-assisted one-pot rapid synthesis of mesoporous silica-chitosan composites for efficient recovery of rhenium(Ⅶ)

•Mesoporous silica-chitosan composites were prepared by one-pot rapid microwave-assisted method.•The adsorbents were prepared without the use of expensive silane coupling agents or organic amine reagents.•The adsorbents have high adsorption capacity and selectivity for Re(VII). Rhenium (Re) is a rar...

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Bibliographic Details
Published inSeparation and purification technology Vol. 277; p. 119497
Main Authors Cui, Junshuo, Li, Wenkang, Song, Xinlun, Zhang, Zetao, Yu, Haibiao, Shan, Weijun, Xiong, Ying
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.12.2021
Subjects
Adsorption
Chitosan
Mesoporous silica
Microwave-assisted
Rhenium
Microwave-assisted
Chitosan
Rhenium
Adsorption
Mesoporous silica
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Summary:•Mesoporous silica-chitosan composites were prepared by one-pot rapid microwave-assisted method.•The adsorbents were prepared without the use of expensive silane coupling agents or organic amine reagents.•The adsorbents have high adsorption capacity and selectivity for Re(VII). Rhenium (Re) is a rare element in the earth’s crust and has wide range applications in industry, its effective secondary enrichment plays a crucial role in environment and energy field. On the basis of economy and resource sustainability, we report a facile and rapid process to prepare chitosan (CS) functionalized mesoporous silica composites for recovery of Re by a one-pot microwave-assisted synthesis method. Schiff base groups inside the nanostructure were functioned as active sites for Re adsorption. A series of characterization analysis indicated that the optimal adsorbent (SS-KIT-6-M4-15-CS3) possessed mesoporous channel and retained the ordered morphology of mesoporous silica skeleton. The maximum adsorption capacity for Re(Ⅶ) of the as-prepared adsorbent reached 261.81 mg·g−1 at pH 4, higher than that of other reported adsorbents. The SS-KIT-6-M4-15-CS3 showed excellent regeneration performance after eight adsorption–desorption cycles, and exhibited high selectivity for Re(Ⅶ). The prominent adsorption performance was attributed to the chelation between C = N and ReO4¯ according to FT-IR and XPS analysis. These findings showed encouraging potentiality of the adsorbent for recovering of Re(Ⅶ) in real industrial effluents.
ISSN:1383-5866
1873-3794
DOI:10.1016/j.seppur.2021.119497