Organo-functionalized Mesoporous Materials For Adsorption Of Antibotics Pollutants

Modification of mesoporous silica materials with organic functional groups displays considerable potential for many applications, including catalysis adsorption, drug delivery, environmental protect et al. Due to its high surface area, large and tunable pore size, multiple pore structure, functionalized mesoporous silica are good adsorbents for removing pollutant from wastewater. Through the introduction of organic groups, which can strengthen the acting force between mesoporous materials and adsorbates, such as electrostatic, hydrophilic /hydrophobic, π-π, complexation, et al, could enhance the adsorption properties of mesoporous materials. Pharmaceutical antibiotics are not easily removed by conventional water treatment technologies and have been recognized as new emerging pollutants. What the aim of this thesis is that synthesis of organo-functionalized mesoporous materials for adsorption of antibotics pollutants. The main contents include:Azide group functionalized mesoporous materials SBA-15 (N3-SBA-15) was synthesized as reaction raw materials by the method of co-condensation. Through occurring click reaction, the organic groups were introduced into mesoporous materials, the results showed that high reaction efficiency and yield. At the same time, by the traditional method of co-condensation and grafting method, synthesizing SBA-15 functional materials, three synthesis methods of materials had similar functional groups. All the materials were used for antibiotics adsorption experiments, the results showed that similar functional groups had similar adsorption tendency. However, organic groups functionalized mesoporous materials, which prepared by the click reaction was more convenient, rapid and less influence on the material structure. A novel application of the clickable material was demonstrated, it can be used as screening materials for efficient functional groups.The above study showed that after introducing organic groups to mesoporous materials, increasing the hydrophobic of materials, can improve the adsorption performance of materials to antibiotics. To improving hydrophobic of materials, not only the organic groups could be introduced to the material surface, but also the surface of materials and skeleton at the same time. Therefore, we synthesized azide group periodic mesoporous silicon material (PMOs), containing ethane functional group in skeleton further, the surface could produce click reaction. Experiments showed that click reaction also fast and high yield rate. The clicked PMOs showed improved adsorption capacity (241 μg/g) for antibiotics (Ciprofloxacin Hydrochloride) compared with azido functionalized PMOs. The results indicated that click reaction can introduce multifunctional groups onto PMOs, thus manifesting their great potential for environmental applications.To studying the reaction between adsorbents and adsorbates, which effected adsorption consequence, we made the following experiments. The synthesis of SH-SBA-15 and SBA-15 were the method of co-condensation, and then synthetized of SO3H-SBA-15. Three kinds of materials adsorb fluoroquinolone antibiotics, SO3H-SBA-15 showed prominent adsorption performance. Generally, we thought that the effect of hydrophobic on adsorption would be stronger than the electrostatic force. After the experiment and the analysis of structure materials, it can be inferred that sulfonic acid functions into the materials is benefit for improving the adsorption property for CFHCl indicating that the electrostatic interaction between SO3H-SBA-15 and CFHC1 is more pronounced than hydrophilicity/hydrophobicity between the adsorbents and the adsorbates. In addition, SO3H-SBA-15, could be reused 3 times without obvious decrease of adsorption property, could be a potential antibiotics adsorbent.