The study for removal of TMA and H2S using metal loaded on cocoa activated carbon

Abstract

제한된 공간인 경우, 트리메틸아민 (TMA) 및 황화수소 (H2S) 독성 가스에 과도하게 노출되는 것은 매우 위험하다. 오염 물질을 흡착ㆍ제거하기 위하여 금속 촉매가 부착된 코코아 활성탄 필터를 개발하였다. 활성탄은 다공성 및 높은 비표면적 때문에 유독성 오염 가스 흡착에 광범위하게 사용되고 있다. 본 연구는 밀폐된 공간에서 구리 촉매가 부착된 코코아 활성탄(Cu/AC) 필터를 사용하여 TMA와 H2S의 제거에 관한 연구를 수행하였다. 초기 농도 400 ppm의 TMA와 H2S를 밀폐된 공간에 주입하고, 구리 촉매가 부착된 코코아 활성탄(Cu/AC) 필터는 TMA 30분, H2S 15분 동안에 완전히 흡착되었다. 또한 흡착 성능을 잘 이해하기 위하여 isotherm과 kinetic 모델을 적용하였다. TMA와 H2S의 흡착은 Langmuir isotherm과 좋은 일치를 나타내었으며, pseudo first order와 pseudo second order 역시 각각 적합하였다. TMA와 H2S의 흡착은 intraparticle diffusion과 Yoon-Nelson kinetic 모델에 일치하였다. H2S 흡착된 Cu/AC 필터는 재활용 가능하였지만, TMA 흡착된 Cu/AC 필터는 재활용 할 수 없었다. 따라서 구리가 부착된 코코아 활성탄 필터는 실내 공기 정화에 적용 가능함을 알 수 있었다.

It is extremely dangerous that excessive exposure to toxic gases as trimethylamine (TMA) and hydrogen sulfide (H2S) in the confined space. The method of a porous pollutant filter has been developed for the removal of toxic pollutant gases by using commercially available cocoa activated carbon after impregnating copper. Activated carbon has been widely used in toxic pollutant gas adsorption due to their porosity and high surface area. In this study, the removal of TMA and H2S was evaluated by using copper loaded on cocoa activated carbon (Cu/AC), much better toxic gas adsorption was achieved in an enclosed chamber. The optimal performance was evaluated with a Cu/AC filter as it eliminated the TMA in 30 min and H2S in 15 min at the initial concentration of 400 ppm in an enclosed chamber. In addition, isotherm and kinetic models were applied to understand the adsorption performance. Langmuir isotherm represented the best fit for the adsorption of TMA and H2S, whereas pseudo first and second order were best in describing the H2S adsorption, and TMA adsorption, respectively. Both of adsorption of TMA and H2S were followed by the intraparticle diffusion and Yoon-Nelson kinetic models. The H2S adsorbed Cu/AC filter was successfully regenerated whereas a TMA adsorbed Cu/AC filter was not successfully regenerated. Findings of this work suggest that with copper impregnation on the cocoa activated carbon is a promising technique for the indoor air purification.