| Summary: | 碩士 === 明志科技大學 === 化學工程系碩士班 === 106 === In this study, SBA-15 graded with graphene oxide (GO)was synthesized usingextraction of rice husk as the silica source.Methylene blue was used to evaluate adsorption capacity of SBA-15/GO. The physical and chemical characteristics of SBA-15 and SBA-15/GO were examined by XRD, FTIR, TEM, SEM, BET and Raman. The adsorption test was proceeded by changing different experimental parameters.The XRD results showedthat SBA-15 had a hexagonal structure and is susceptible to the effect of pH rise. The FTIR spectra confirmed thatthe silica could be extracted effectively from the rice husk, andthere is no corresponding bond in Si. SEM images showed that the SBA-15/GO composites were curled and the particle size was approximately 0.75μm. The TEM images showed that the holes and channels of SBA-15 and SBA-15/GO composites were neat. The pore diameterand surface areaof SBA-15 were 11.2 nm and 656 m2/g. The pore diameterand surface area of SBA-15/GO were 10.59 nm and 499 m2/g. It is known from Raman spectra that SBA-15/GO synthesized using 6.0 g and 0.5 wt% GO revealed the optimum ID/IGratio (0.9948). The resultsof isothermal adsorption experiment indicated that SBA-15 was in accordance with Langmuir model.However, SBA-15/GO was in accordance with Freundlich model. However,the two samples meet the quasi-second order kinetic adsorption pattern.The maximum adsorption capacity of SBA-15/GO is 481.18 mg/g. Finally, the SBA-15/GO composites prepared using 125 mL, 2 M HCl, 25 mL 2 N sodium silicate and 6.0 g, 0.5 wt% GO,showed the optimum pore structure and adsorption abilities.
|
|---|
