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MCM-41 mesoporous material was prepared under a standard conditions by using cetyltrimethylammonium bromide as a structure-directing agent and tetraethyl orthosilicate as silica source from the liquid phase at 80 °C. Powder X-ray diffraction and scanning electron microscopy used to characterize the product, showed that the MCM-41material had an average particle size of 110 nm. The synthesized material was used to investigate the effects of acidity, adsorption time, the concentration of Hg, adsorbent dosage and temperature on the adsorption of Hg. The results showed that the optimal adsorptive conditions were: pH 5.0, m(MCM-41):mHg2+ 6.67, temperature 20 °C and contact adsorption time 60 min, for the initial Hgconcentration of 1.0 mg/cm. The maximum adsorptive amount of Hg was 56.48 mg Hg/g MCM-41. The results of the desorptive effect of three desorption agents such as HCl, HNO3 and HAc showed that the best desorbent was HCl at the concentration of 0.10 mol/dm. The highest desorption efficiency was 77.21% for the desorption time 2 h.

Adsorptive performance of MCM-41 towards Hg(II) in water. Adsorption and desorption studies