Abstract:
Adsorption of 17 α -Methlytestosterone (MT) by different porous silicate adsorbents ( Hexagonal Mesoporous Silicate (HMS), Titanium substituted HMS (Ti-HMS), Santababara Acid 15 (SBA-15) and Pore expanded SBA (SBA-CHX)) was studied comparing with NaY Zeolite (NaY) powdered activated carbon (PAC) granular activated carbon (GAC) and superparamagnetic particle (SP). The results indicated that the adsorption of MT on HMS Ti-HMS SBA-15 and SBA-CHX was found to decrease rapidly in the first and then MT was significantly desorbed and reach equilibrium. NaY and SP cannot adsorb MT, because NaY has smaller pore structure comparing with molecular size of MT and SP has no porous structure. Adsorption of MT cannot be described by The pseudo-first-order and The pseudo-second-order kinetic model. Adsorption isotherm was well described by Freundlich isotherm by non-linear estimation. The kinetic and adsorption capacity of MT are significantly influenced by the porous and crystalline structures, in terms of the pore size and volume as well as surface area. SBA-15 had highest MT adsorption capacity (not included GAC and PAC). However, SBA-CHX which has largest pore structure did not perform highest adsorption capacity, this might relate to too large pore structure might enhance desorption of MT from pore. All adsorbents had highest MT adsorption capacities at pH 5, which might due to ion-dipole interaction.