Diethyl sulfide modified silica and calix[4]pyrrole chelating resin: Synthesis and mercury(II) cation retention properties

作者：de Namor Angela Danil^*; Abbas Ismail

来源：Analytical Methods, 2010, 2(1): 63-71.

DOI：10.1039/b9ay00135b

Diethyl Sulfide was chemically immobilized oil the surface of silica gel (0.2-0.5 and 0.06 mm) for the formation of two newly synthesized silica gel phases (S(1) and S(2)). A new chelating resin containing mesotetramethyl -tetrakis-(thiophene)calix[4]pyrrole. CP(I), was also synthesized via the condensation of CP(I) with fomaldehyde. The selection of this receptor is based oil fundamental Studies. Among the cations and anions considered, CP(I) interacts only with mercury(II). The functionalized silicas and the calixpyrrole resin were characterized by elemental analysis and mass spectrometry. The batch removal of metal cations (Hg(2+), Pb(2+) and Cd(2+)) by these materials from aqueous solutions was investigated. The Uptake capacities of the silica based materials (S(1) and S(2)) and calixpyrrole polymers (R(1)) for the Hg(2+) cation were determined. The Hg(II) Cation Uptake data have been found to fit both, the Langmuir and Freundlich isotherms, and the coefficients indicated favorable Uptake of this cation by these materials. Parameters Such as the kinetics of the Uptake process, pH, temperature, silica particle size and metal-ion concentration effects were evaluated. The data obtained clearly indicate that S(1) has the higher Uptake capability and faster retention rate for Hg(II) ions relative to S(2) and R(1). In a Column operation, it was observed that the Hg(2+) Cation was eftectively removed from aqueous solution by the calixpyrrole resin, R(1). The percentage of recovery of this resin for the Hg(2+) cation was found to be higher than 95%. The results obtained are compared with previously reported materials for mercury removal from aqueous solutions.

• 出版日期2010-1