1992 Volume 1992 Issue 12 Pages 1479-1483
New chelate resins were prepared by the reaction of a diphenyl phosphonate-formaldehyde resin with polyamine. The adsorption and desorption of gold(III) with the present chelate resin were examined.
The prepa red resin modified with triethylenetetramine, tetraethylenepentamine, and pentaethylenehexamine have the high adsorption capacity (2.3 mmol Au/g-resin). Gold(M) is readily adsorbed on the resins as anionic chloro-complexes from hydrochloric acid solution. Adsorption rate of gold(11) is high and the gold(M) was adsorbed effectively by passing gold (III) solution (100 mgdm-3) through the resin column at SV 600.1-cl. The presence of 0.5moldm-8 KH2PO4 at pH 4.2 or 0.2 moldm-3 HNO3 and the five-times amount of Cu(10, and Al(III) to gold(III) at pH O.5 do not affect the adsorption efficiency of gold(III). The gold(III) loaded on a column can be eluted with 0.5 moldm-3 HCl-50 v/v% acetone aqueous solution.
The DPP-PEH resin loading gold(ll) which was treated with NaBH4 in ethanol can be utilized as a catalyst for hydrogenation of acetylene.
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