Effect of synthesis method on selective adsorption of thiosulfate by calcined MgAl-layered double hydroxides

•Calcined MgAl-LDHs could separate S2O32- from mixed SCN− by selective adsorption.•The synthesis method of calcined MgAl-LDHs influenced their adsorption performance.•Calcined MgAl-LDH obtained using urea decomposition method presented the better adsorption selectivity for S2O32-.•Different adsorpti...

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Published inChemical engineering journal (Lausanne, Switzerland : 1996) Vol. 232; pp. 510 - 518
Main Authors Geng, Cuiyu, Xu, Tianhao, Li, Yaping, Chang, Zheng, Sun, Xiaoming, Lei, Xiaodong
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.10.2013
Subjects
Adsorption
Calcined layered double hydroxides
Hydroxides
Materials selection
Roasting
Selective adsorption
Selectivity
Surface chemistry
Synthesis
Thiosulfate
Wastewater treatment
Calcined layered double hydroxides
Thiosulfate
Wastewater treatment
Selective adsorption
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Summary:•Calcined MgAl-LDHs could separate S2O32- from mixed SCN− by selective adsorption.•The synthesis method of calcined MgAl-LDHs influenced their adsorption performance.•Calcined MgAl-LDH obtained using urea decomposition method presented the better adsorption selectivity for S2O32-.•Different adsorption behaviors over the two calcined MgAl-LDH were studied. Calcined MgAl-layered double hydroxides (CLDH-U) derived from layered double hydroxide (LDH) precursors synthesized by urea decomposition, had the higher adsorption selectivity for thiosulfate (S2O32-) in aqueous solutions mixed with thiocyanate (SCN−) than the counterpart (CLDH-C) obtained by co-precipitation method. The adsorption rates for S2O32- over CLDH-U with diameter in 2μm and CLDH-C with diameter in 50nm were respectively about 98.00% and 94.80%, and those for SCN− were only about 0% and 6.84%. The results revealed that the selective adsorption was realized over these CLDH materials and the synthesis method influenced the adsorption behavior. The reason for the better selectivity over CLDH-U could be probably related to these mini sheets growing perpendicularly to the lamellate surface, which completely differed to the adsorption process over the small-sized counterpart. The different adsorption mechanisms of two CLDH materials were respectively proposed.
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ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2013.08.010