• Desorption of Adsorbed Humic Acid on Carbon nano Tubes
  • Jo, Mihyun;Lee, Jai-Young;
  • Dept. of Environmental Engineering, The University of Seoul;Dept. of Environmental Engineering, The University of Seoul;
  • 카본나노튜브에 흡착된 휴믹산의 탈착에 관한 연구
  • 조미현;이재영;
  • 서울시립대학교 환경공학과;서울시립대학교 환경공학과;
Abstract
Concerns have been raised over the impact of nano materials on soil and groundwater environment with the increasing attention to the potential applications of carbon nano materials in various fields. Particularly, carbon nano materials introduced into water environment readily make complexes with humic acid (HA) due to their hydrophobic nature, so there have been increasing numbers of studies on the interaction between HA and carbon nano materials. In this study, we investigated the solubility of HA and multiwalled carbon nanotubes (MWCNT) in three different surfactant solutions of sodium dodecyl sulfate (SDS), Brij 30 and Triton X-100, and evaluated whether the HA can be effectively desorbed from the surface of MWCNT by surfactant. The objective of this study was to determine the optimal adsorption condition for HA to MWCNT. Futhermore, sodium dodecyl sulfate (SDS), Brij 30, Triton X-100 were used to elucidate the effect of desorption and separation on adsorbed HA on MWCNT. As a result, HA solution with 12.7 mg of total organic carbon (TOC) and 5 mg of MWCNT showed the highest adsorption capacity at pH 3 reacted for 72 hrs. Weight solubilizing ratio (WSR) of surfactants on HA and MWCNT was calculated. HA had approximately 2 times lower adsorption capacity for the applied three surfactants compared to those of MWCNT, implying that the desorption of HA may occur from the HA/MWCNT complex. According to the results of adsorption isotherm and weight solubilizing ratio (WSR), the most effective surfactants was the SDS 1% soluiton, showing 53.63% desorption of HA at pH 3.

Keywords: Adsorption;Solubility;Humic Acid (HA);Multiwalled Carbon Nano Tubes (MWCNT);Surfactants;

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This Article

  • 2013; 18(7): 81-89

    Published on Dec 30, 2013

  • 10.7857/JSGE.2013.18.7.081
  • Received on Dec 19, 2013
  • Revised on Dec 30, 2013
  • Accepted on Dec 30, 2013