Abstract
“Imbibition” of Zn2+ ions into the cation vacancies of bayerite–Al(OH)3 and NO3− ions into the interlayer gallery yields an Al-rich layered double hydroxide with Al/Zn ratio ~3. NO3− ions are intercalated with their molecular planes inclined at an angle to the plane of the metal hydroxide slab and bonded to it by hydrogen bonds. Rietveld refinement of the structure shows that the monoclinic symmetry of the precursor bayerite is preserved in the product, showing that the imbibition is topochemical in nature. The nitrate ion is labile and is quantitatively replaced by CrO42− ions from solution. The uptake of CrO42− ions follows a Langmuir adsorption isotherm, thus showing that the hydroxide is a candidate material for green chemistry applications for the removal of CrO42− ions from waste water. Rietveld refinement of the structure of the hydroxide after CrO42− inclusion reveals that the CrO42− ion is intercalated with one of its 2-fold axes parallel to the b-crystallographic axis of the crystal, also the principal 2 axis of the monoclinic cell.
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