Preparation Of Functional Ordered Mesoporous And Its Removed Effects On PPCPs

Ordered mesoporous carbon(OMC) is a new type of non-silicon mesoporous material that has been developing rapidly over the past few years. As one of the novel material, ordered mesoporous material with many unique properties such as ordered pore structure, uniform pore diameter, high specific surface area and great pore volume, will be widely applied in various fields including adsorption, catalysis, separation,energy storage, electronic and so on. In recent years, the study of ordered mesoporous materials, especially for the ordered mesoporous carbon(OMC) extremely modified materials(functional ordered mesoporous carbon) has attracted attention of scientific workers. Hard templates method is the most commonly used and effective preparation method in synthesizing OMC.In this method, some carbon sources such as acrylic acid and sucrose were filled in the template and carbonized to obtain mesoporous carbon/silica complex. Then, the silica template was removed, and the silica mesoporous carbon which has the opposite structure with the template was obtained. This simple preparation method has the important meaning regarding the nature and purpose of our further study and development of ordered mesoporous carbon.In this study, OMC was prepared with the hard template synthesis method. The Fe-containing mesoporous carbon composite materials(Fe/OMC) were synthesized by di-solvent impergation of iron salts ferric nitrate, carbothermal reduction following previous calcinations using OMC as a carrier. Then OMC and Fe/OMC were used to treat amoxicillin simulated organic wastewater, respectively and the treatment results were compared.The main research contents and results are as follows:(1) SBA-15, a kind of ordered mesoporous silica with 2D-hexagonal structure was prepared by using P123( EO20PO70EO20, BASF)as template and tetraethoxysilane as silicon source. The BET surface area, and pore diameter of the mesoporous silicon were 727m2/g, and 5.5nm, respectively. Ordered mesoporous carbon was prepared by using SBA-15 as template and sucrose as carbon source. OMC had inherited the p6 mm structure of SBA-15. The BET surface area, and pore diameter were 1508m2/g, and 1.22 nm, respectively.(2)The Fe/OMC composites was prepared with OMC as a carrier and Fe(NO3)3·9H20 as the iron source. The order of the Fe/OMC decreased with increasing of the Fe concentration. Fe3+ ions can be reduced by carbothermal reduction at 800℃, and existed in α-Fe0 state. The nmometal particles with a diameter of 10-50 nm dispersed well in the carbon matrix, which can explain ordered mesoporous carbon matrix to form the iron particles with good confinement effect. Fe / OMC-x series of composite material has good degree of order, and with the increase of iron content, the degree of order is lower. However, with the increase in the amount of iron contain, the specific surface area of composite materials and pore volume were decreased, but the wall thickness was increased.(3)The adsorption experiments on simulated amoxicillin wastewater with OMC and Fe/OMC as adsorbent,effects of reaction time, doses and pH were studied. The results showed that the removal rate of amoxicillin increased with increasing amount of the modified activated carbons. The optimum pH were 4.0 and 3.0 respectively for OMC and Fe/OMC. For OMC and Fe/OMC, appropriate dosage was 5.0 g/L, optimum pH was 3.0 and the removal rate reached maximum at 12 h. Amoxicillin removal rate was up to 70.52% by OMC and the rate was up to 91.42% by Fe/MOC. OMC and Fe/OMC amoxicillin solution studies Adsorption experiments show that the pseudo-second rate equation can be used to describe the adsorption kinetics, Freundlich model to describe the adsorption isotherm.