Study On The Synthesis, Modification And Properties Of Hexagnoal Mesoporous Silica

The research of hexagonal mesoporous silica(HMS) has become a hot point in the field of materials in recent years because of its excellent characteristics. At present, the formation mechanism of mesoporous structure, effects of mesoporous structure and properties, as well as modification of material skeleton and application should be investigated further.The synthesis, structure, mechanism and performance of HMS material were discussed in this dissertation. Furthermore, the synthesis, structures, properties and applications of modified HMS with copper, silver and iron in the framework were also studied. The results showed that the formation of mesoporous structure of HMS complied with SoIo molecular assembly mechanism. The material has stable structure and excellent mesoporous properties, and the methods of demoulding have great effects on mesoporous structure and stability. HMS modified with copper, silver, copper-silver and iron have high-quality mesoporous structure. However, the structures, properties, morphologys, thermo-chemical changing processes of demoulding, and some other aspects of modification materials have changed dramatically. In antibacterial experiments, copper, silver modified materials showed good antibacterial properties. The dosage of 200 mg/L of copper modification material can maintain a long-lasting bactericidal effect on E. coli, S. aureus and B. subtilis within 24?72 h, 1.00 mg/L of silver?modified material can kill B. subtilis and E. coli completely in 12 h, 100 mg/L of Cu and Ag modification material also shows a long-lasting bactericidal effect on B. subtilis in 6 h and it can completely kills G. bacillus in 36 h. Meanwhile, the outstanding catalytic performance of iron-modified HMS and the 46.9% conversion rate of phenol have been shown in the reaction of phenol hydroxylation.