Effect of the nature of the salt precursor of an oxide-hydroxide sorbent on the sorption of oxalate ions

Generalizations are made on the effect of the nature of a precursor (the original salt of a metal) on the sorption activity of hydrogels of oxidehydroxides (OHes) towards oxalate ions using the example of an OH obtained by the alkaline hydrolysis of chloride, perchlorate, and sulfate of Fe(III); chloride, sulfate, and nitrate of Al; and nitrate of Zr(IV). It is established that the sorption of C2O42− on the studied OHes is described by the Langmuir equation. We find that the sorption activity depends on the nature of the precursor: Al2(SO4)3 > Al(NO3)3 > AlCl3 > ZrO(NO3)2 > Fe2(SO4)3 > FeCl3 > Fe(ClO4)3.