RESUMEN
A glass plate was coated with calcium hydroxyapatite (CaHAp) by a dip-coating method and employed for the removal of aqueous cadmium. Sol obtained from alcoholic solution of (NH(4))(2)HPO(4) and Ca(NO(3))(2) x 4H(2)O was employed for the precursor of the CaHAp layer. The preparation of CaHAp from the sol needed a rather low calcination temperature of 573 K and the resulting solid mainly contained CaHAp. It was shown that the glass plate coated with CaHAp with the sol could be employed for the removal of aqueous cadmium. Furthermore, it was found that cadmium immobilized on the coated plate could be regenerated into weak acidic solution. A dissolution-precipitation mechanism was suggested for the removal-regeneration of aqueous cadmium.
RESUMEN
Magnesium hydrogen phosphate, calcium hydroxyapatite, and strontium hydroxyapatite were successfully prepared from sol consisting of sodium alginate and Na4P2O7 with Mg2+, Ca2+, and Sr2+ in the corresponding nitrates, respectively. It is revealed that the order of the addition of those substrates and the role of sodium alginate are important factors for the preparation of desired phosphate compounds. According to the previous paper on the preparation of calcium hydroxyapatite, sodium alginate was mixed with aqueous Na4P2O7, followed by the addition of the aqueous divalent cations, resulting in the poor formation of the target phosphates. However, as a revised sol-gel technique, sodium alginate was added to the mixture of Na4P2O7 and aqueous Mg2+ and Sr2+, resulting in a rather favorable formation of MgHPO4 and strontium hydroxyapatite, respectively, while the sol thus obtained was stable within a few days. However for aqueous Ca2+, calcium hydroxyapatite could not be obtained through the revised sol-gel technique. In the preparation of magnesium hydrogen phosphate, sodium alginate contributes mainly to the sol formation of the precursor. The ion exchange between Na+ in sodium alginate and aqueous Ca2+ was important for the preparation of calcium hydroxyapatite. In contrast, the reaction of sodium alginate with the mixture of Na4P2O7 and aqueous Sr2+ afforded strontium hydroxyapatite at the specific ratio of those three substrates. The structure of calcium and strontium phosphates prepared from the revised sol-gel process evidently depended on the amount of sodium alginate introduced into the mixture of Na4P2O7 and the corresponding divalent cations.