염기성용액으로 첨착시킨 활성탄의 물성분석 및 H2S 흡착특성 (H2S Adsorption Characteristics and Property Analyses of Activated Carbon Adsorbent Impregnated with Basic Solutions)

서지정보

· 발행기관 : 대한환경공학회
· 수록지 정보 : 대한환경공학회지 / 32권 / 11호 / 1011 ~ 1016페이지
· 저자명 : 이석기, 임창선, 박영성

초록

본 연구에서는 NaOH, KOH, (CH2CH2OH)2NH 등의 염기성용액으로 첨착(함침)시킨 활성탄의 물리․화학적 특성을 분석하고 H2S 흡착특성을 고찰하였다. 실험변수로는 흡착온도(25~45℃), 흡착질인 황화수소 가스농도(18.23 mg/L) 등이 적용되었다. 첨착시약으로 사용된 NaOH, KOH 용액의 농도는 1~5 M, (CH2CH2OH)2NH 용액의 농도는 0.1~1 M 범위내에서 적용되었다. 실험결과, 첨착액의 농도가 증가할수록 KOH로 함침시킨 활성탄의 BET 표면적은 1,050 m2/g에서 750 m2/g로 감소하였고, NaOH로 함침시킨 활성탄의 표면산도는 0.541 meq/g-AC에서 0 meq/g-AC으로 감소한 반면, pH는 9.54에서 10.94로 증가하는 것으로 밝혀졌다. 또한 첨착활성탄의 H2S 평형흡착능은 디에탄올아민으로 첨착시킨 경우에 가장 높았으며, 평형흡착능은흡착온도에 비례함을 보였다. 흡착온도가 45℃일 때 비첨착활성탄에 비해 2.0~3.3배 높은 수준의 H2S 평형흡착능을 보여 주었다.

영어초록

The H2S adsorption characteristics and property analyses of granular activated carbon adsorbent impregnated with basic solution such as NaOH, KOH, and (CH2CH2OH)2NH were investigated. The concentrations of NaOH and KOH reagent ranged over 1 to 5 M, The concentration of (CH2CH2OH)2NH was in the range of 0.1 to 1 M. Adsorption temperature(25~45℃) and adsorbate (H2S) concentration (18.23 mg/L) were applied. The experimental results showed that the BET surface area of activated carbon impregnated with KOH decreases from 1,050 m2/g to 750 m2/g, and the acidity of activated carbon impregnated with NaOH decreases from 0.541 meq/g-AC to 0 meq/g-AC, as the concentration of basic solution increases, while the pH of impregnated activated carbon increased from 9.54 to 10.94 for three basic solutions. It was also found that the H2S adsorption equilibrium capacity of activated carbon impregnated with NaOH, KOH, (CH2CH2OH)2NH increased with increasing temperature and H2S adsorption equilibrium capacity of the activated carbon impregnated with diethanolamine was much higher than other cases. At adsorption temperature of 45℃, the H2S adsorption equilibrium capacity of impregnated activated carbon was 2.0~3.3 times lager than that of pure activated carbon.

참고자료

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