| Summary: | 碩士 === 中原大學 === 生物環境工程研究所 === 103 === Titanate nanotubes (TNTs) with the high specific surface area can be used as the adsorbents. Activated carbon is the most common adsorbent to adsorb volatile organic compounds (VOCs). However, it is high cost to produce the activated carbon. The water vapor might affect adsorption of organic vapor on the activated carbon surface.In this study, we use organic substance to modify the surface of TNT, which changes the hydrophilic surface to hydrophobic one. Then, the synthesized adsorbents were applied to adsorb organic vapor. The adsorptive amounts of VOCs and adsorption mechanism were discussed.
The TNT was synthesized through a hydrothermal method. Then, the TNT was modified using octadecyltrichlorosilane (OTS) and hexadecyltrimethylammonium bromide (HDTMA) to produce OTNT and HTNT. The materials were characterized using SEM、TEM、FTIR、EDX and contact angle. The target VOCs included toluene, ethylbenzene, n-hexane, n-heptane, 1,1,2-trichloroethane and tetrachloroethylene. The synthesized TNT, OTNT and HTNT were laid in the pilot. Nitrogen was used to mix and purge organic vapor to pass through adsorption tube. The adsorptive amount of organic compounds and adsorption mechanisms between the adsorbents and adsorbates were discussed.
Results showed that the highest adsorption capacities of VOCs were for all adsorbents is in the decreasing ordertoluene > ethylbenzene >1,1,2-trichloroethane > tetrachloroethylene>alkanes. Except for alkanes, adsorptive amounts of organic compounds were related to their volatilization rates. The adsorptive amounts for all of VOCs adsorbing on the adsorbents indicated the decreasing order OTNT> HTNT > TNT. So we know the mechanism of adsorption of not only concerned with the hydrophilic and hydrobic organics.
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