Fig. 2: Additive-induced supramolecular polymerization between β-CD, KAuBr4, and a collection of additives.
From: High-efficiency gold recovery by additive-induced supramolecular polymerization of β-cyclodextrin
a Visual display of the selective co-precipitation between β-CD and KAuBr4 upon adding additives. b Effect of adding different additives on the yield of gold-bearing co-precipitates. The error bar represents the standard deviation of two independent measurements. c Effect of the amount of dibutyl carbitol (DBC) on the yield of gold-bearing co-precipitates. d FTIR Spectra of DBC, KAuBr4⊂β-CD, and the KAuBr4·DBC⊂2β-CD co-precipitate obtained by adding DBC to an aqueous solution of KAuBr4⊂β-CD complex. The highlighted regions with yellow show their characteristic vibration peaks. e Powder X-ray diffraction patterns of the KAuBr4·DBC⊂2β-CD co-precipitate, compared with a simulated pattern derived from X-ray crystallographic data for HAuBr4·DBC⊂2β-CD cocrystal. f, g SEM Images of the KAuBr4·DBC⊂2β-CD microcrystals prepared by adding DBC to an aqueous solution of KAuBr4⊂β-CD.
