Application of 1-phenyl-3-methyl-4-stearoyl-5-pyrazolone doped mesoporous silica to the determination of metal

Abstract

The metal extraction properties of 1-phenyl-3-methyl-4-stearoyl-5-pyrazolone (HPMSP) doped mesoporous silica prepared by a template-tailored sol-gel process were investigated in both batch and column methods. The metal sorption capacities of the modified sorbent determined by batch experiments were governed not only by the pH of metal solution but also the presence of salts in metal solution. The capacities of the modified silica at optimum conditions for the extraction of Cd(∥), Pb(∥) and Zn(∥) were found to be 0.21, 0.12 and 0.32 mol/kg, respectively. A 2³ factorial design served for the determination of principal parameters on the Cu(∥) desorption efficiency of the sorbent reached the conclusion that the significant factors were the amount of Cu(∥) and the concentration of HNO₃ as eluent. The Cu(∥) sorption capacity of the modified silica determined by column process was found to be 0.0998 mol/kg. The potential application of the HPMSP doped mesoporous silica to the preconcentration of Cu(II) from aqueous solution was accomplished with the maximum preconcentration factor of 40. The study of metal adsorption-desorption cycles showed the reusability of the sorbent without considerable loss of adsorption capacity. The HPMSP doped sorbent was also successfully applied for the extraction of metal ions contained in seafood matrix.