Author/Authors :
Esmaeili Bidhendi، Mehdi نويسنده 1Department of Environmental Engineering, Graduate Faculty of Environment, University of Tehran, Tehran, Iran , , Nabi Bidhendi، Gholam Reza نويسنده 1Department of Environmental Engineering, Graduate Faculty of Environment, University of Tehran, Tehran, Iran , , Mehrdadi، Nasser نويسنده Department of Environmental Engineering, Faculty of Environment, University of Tehran, Tehran, Iran , , Rashedi، Hamid نويسنده ,
Abstract :
Background: Removal of mercury from aqueous environment has been highly regarded in recent years and
different methods have been tested for this purpose. One of the most effective ways for mercury ions (Hg+2)
removal is the use of modified nano porous compounds. Hence, in this work a new physical modification of
mesoporous silica (SBA-15) with 1, 3, 5 (Trithiane) as modifier ligand and its application for the removal of Hg+2
from aqueous environment has been investigated. SBA-15 and Trithiane were synthesized and the presence of
ligand in the silica framework was demonstrated by FTIR spectrum. The amounts of Hg+2 in the samples were
determined by cold vapor generation high resolution continuum source atomic absorption spectroscopy. Also, the
effects of pH, stirring time and weight of modified SBA-15 as three major parameters for effective adsorption of
Hg+2 were studied.
Results: The important parameter for the modification of the adsorbent was Modification ratio between ligand and
adsorbent in solution which was 1.5. The results showed that the best Hg+2 removal condition was achieved at
pH = 5.0, stirring time 15 min and 15.0 mg of modified adsorbent. Moreover, the maximum percentage removal of
Hg+2 and the capacity of adsorbent were 85% and 10.6 mg of Hg+2/g modified SBA-15, respectively.
Conclusions: To sum up, the present investigation introduced a new modified nano porous compound as an
efficient adsorbent for removal of Hg+2 from aqueous environment.
