Synthesis Of Functionalized Mesoporous Silica For Heavy Metals Removal From Aqueous Media

With the development of the industrialization, Heavy metal as one of the important pollutants in water becomes a severe public health concern because of its persistent nature and negative effect on the environment. They are difficult to remove from aqueous waste streams with trace quantities using conventional methods such as chemical precipitation. So, seeking a kind of environmentally friendly, easy operation and low cost of processing method is urgently needed.Mesoporous silica material SBA-15 is a kind of promising materials because of its advantages such as large pore size, high surface areas order and adjustable pore structure and so on. P123 is the template agent synthesis of SBA-15, and through the method after grafting modification, functionalized the mesoporous materials. Then these new adsorbents were characterized with FTIR, TEM and XRD. Furthermore, adsorption experiments in a batch method were carried out to examine the adsorption performance for some heavy metal ions. Many models such as kinetic, thermody namic, equilibrium models were used to fit the experiment data to understand the adsorption mechanisms. This thesis contains the following four sections:1. After SBA-15 functionalizationed by 2-formyl-8-hydroxyquinoline, we get Q-SBA-15, characterized and used as an adsorbent for heavy metal ion, Cu???. The functionalized mesoporous materials are characterized by means of XRD, FT-IR, TEM and N2 adsorption-desorption analysis. The result indicates that, after sequent chemical modifications of organic group, the primary hexagonally ordered mesoporous structure of SBA-15 is not affected, exhibits the excellent adsorption capacity. The removal rate of Cu??? in aqueous media is high?99.6%?. Moreover it remains keep the best adsorption selectivity when has many components. Meanwhile, Cu-Q-SBA-15 antibacterial agent was shown to be an effective bactericide against Bacillus coli and Staphylococcus aureus, indicating that it has good antibacterial effect.2.2,2'-Bipyridine-4,4'-dicarboxylic acid modified SBA-15 mesoporous silica was prepared, called Bda-SBA-15 was found to be a better adsorbent for selective removal of Cu??? from polluted water. A series of experiments show that, the adsorption equilibrium could be reached within 60 min and the maximum adsorption capacity of Bda-SBA-15 for Cu??? was 81.3 mg g^-1 and the removal rate was 97% at pH 5.0 and the initial concentration of 100?350 mg/L. In the antibacterial experiments, Bda-SBA-15 and Cu-Bda-SBA-15 showed excellent antibacterial properties.3. An organic-inorganic hybrid mesoporous silica ?D-SBA-15? material was synthesized by post-grafting method of NH2-SBA-15 with meso-2,3-Dimercaptosuccinic acid ?DMSA?. D-SBA-15 showed very good selectivity for Hg??? from polluted water. A series of experiments show that, pH 2.0-5.0, room temperature,60 min, initial concentration of 100 mg/L, was the best experimental conditions. The maximum adsorption capacity for Hg??? was 57.23 mg g^-1 and the removal rate was 99.7% at the condition.