Synthesis,characterization and gas adsorption of mesoporous carbon

• Main Authors: Chien-Hsiang Chiu, 邱建翔
• Other Authors: Chi-Feng Cheng
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/7c32de

碩士 === 中原大學 === 化學研究所 === 99 === In this study, resol (phenol/formaldehyde) was used as precursor with different surfactants (P123 and F127) to synthesize the nanoporous carbon polymer material (PNC). Optimization was done by controlling the concentration of surfactants and the carbon source. Surface modification of carbon materials, either nanoporous carbon (PNC) or ordered mesoporous carbon materials (OMC) was conducted by introduction of copper metal (Cu), chromium metal (Cr), mixed metals (Cu and Cr) and organic compound (TEDA) into the pores of carbon materials. These surface modified materials chemically adsorbed three gasses namely hydrogen sulfide (H2S), ammonia (NH3) and chloroform (CHCl3). The chemisorptions of the three gasses (H2S, NH3, CHCl3) with different adsorbents gave the following adsorption capacity PNC>OMC>AC. Although the carbon materials impregnated by mixed metals gave a stronger adsorption as compared to those impregnated with single metal, carbon materials with organic molecule (TEDA) showed the highest adsorption capacity for hydrogen sulfide adsorption. However, in chloroform adsorption, PNC and OMC carbon materials were about ten times the adsorption of AC. These can be attributed to the hydrophobic surfaces which attracted the chloroform which is also hydrophobic. The adsorbents have high surface areas which is very important factor in the adsorption of this organic compound. In addition, modified carbon materials containing carboxyl PNC-NS gave the best adsorption as compared to the rest of surfaced modiefied carbon materials for ammonia adsorption. Adsorption equilibria of VOCs (n-pentane, n-hexane and methanol) on nanoporous carbon were obtained. For comparison purposes, four adsorbent materials (PNC, OMC, SBA-15 and AC) were used to investigate the adsorption. PNC and OMC gave strong adsorption with n-pentane and n-hexane due to the non-polarity of both adsorbents and adsorbates. For two alkanes maximum adsorption capacity of the four adsorbents was PNC>OMC>SBA-15>AC. Adsorption capacity is almost proportional to its pore volume.