Abstract
The purpose of this study is to investigate the adsorptive properties of pollutants on SBA-15 in solution. Titanium (Ti) and Calcium (Ca) were modified on SBA-15 supports in order to improve the applications of traditional SBA-15 materials. A novel Ti-containing SBA-15 (TiSBA-15) material using co-precipitation method combines the adsorptive capability of mesoporous SBA-15 and photocatalytic ability of Ti. This combination makes TiSBA-15 a potential material to adsorb the pollutant and then degrade it photocatalytically. CaO/SBA-15 composite was synthesized by impregnation method using calcium acetate as the calcium precursors and then calcined to form CaO on the surface of SBA-15. The modification of Ca on SBA-15 leads into the ability to absorb CO2. All prepared materials were characterized by powder X-ray diffraction patterns (XRD), nitrogen sorption isotherms techniques, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX), transmission electron microscopy (TEM), and inductively coupled plasma-mass spectroscopy (ICP-MS). In terms of adsorption properties, the performance was examined by the adsorption of dyes on prepared materials. It is concluded that SBA-15 exhibits an excellent adsorptive capability of cationic molecules but almost no adsorption of anionic and neutral molecules. Langmuir model, Freundlich model, and pseudo-second-order kinetics were well-fitted in the simulation of the adsorption behavior of dyes on prepared materials. The photodegradation of MB and TOC analysis on solid composites were used to evaluate the catalytical performance of TiSBA-15. An adsorption and photocatalysis process cycle test was used to estimate the regeneration performance of TiSBA-15. The results indicate that TiSBA-15 can be an effective material to reduce organic pollutants in solution. The CO2 adsorption performance on CaO/SBA-15 was evaluated by TG analysis. The composite is considered as a potential high temperature CO2 adsorbent with an over 85% uptake ability after 20 cyclic runs.