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선택적 이산화탄소 포집을 위한 KOH 첨착활성탄 제조연구
홍현의,Adedeji Adebukola Adelodun,조영민 한국냄새환경학회 2013 실내환경 및 냄새 학회지 Vol.12 No.4
본 연구의 목적은 활성탄의 CO2 흡착능을 향상시키기 위하여 화학적 전처리 방법을 개발하는 것이다. 다양한 방법과 이론이 존재하지만 이번 연구에서는 아미노화와 분해를 비교하여 흡착능을 비교하기로 하였다. 본 연구에서는 4가지 유형의 활성탄 입자를 원료 물질과 크기에 따라 준비하였고, 수산화칼륨으로 전처리하여 열처리 및 아민화과정을 거 친 후, CO2 흡착능을 비교 평가하였다. 실험결과, 단순 열처리과정만 적용할 때는 600℃ 가 가장 우수하였고, 800℃에서 아민화시킨 시료가 1.4 mmol/g의 가장 좋은 흡착능을 보 였다. 400~600℃에서 아민화를 시킨 시료는 처리온도와 비례하는 선택도를 보여주었다. 분해시간 또한 흡착능과 정비례하는 관계가 나타났다. This study attempted to gain improvement of CO2 adsorption capability of activated carbon (AC). Four types of AC pellets based on carbon type and size were prepared with calcination and amination after KOH pretreatment, and examined in CO2 adsorption amount. Experimental results showed that calcination at 600℃ and amination at 800℃ of KOH-doped AC were the most suitable treatment temperature to achieve the enhanced adsorption capacity, 1.4 mmol/g. With amination between 400 and 600℃, the adsorption selectivity for CO2 increased with increasing temperature. It also was observed that the heat-treatment time would be directly proportional to the adsorption efficiency.
TEPA impregnation of electrospun carbon nanofibers for enhanced low-level CO2 adsorption
WANG JIE,Adelodun Adedeji Adebukola,오종민,조영민 나노기술연구협의회 2020 Nano Convergence Vol.7 No.7
The CO 2 adsorption selectivity of plain activated carbon nanofibers (ANF) is generally low. For enhancement, nitrogen functionalities favorable for CO 2 adsorption are usually tethered to the ANF. In the current study, we adopted chemical impregnation using 0.5 wt% tetraethylenepentamine (TEPA) solution as an impregnant. To enhance the impregnation of TEPA further, preliminary oxidation of the nanofibers with 70% HNO 3 was conducted. The effects of HNO 3 and TEPA treatments on the modified ANFs were investigated for physical (using N 2 monosorb, thermogravimetric analyzer, scanning electron microscopy) and chemical (X-ray photoelectron spectrometer) changes. From the results, we found that although TEPA impregnation reduced the specific surface area and pore volume of the ANFs (from 673.7 and 15.61 to 278.8 m 2 /g and 0.284 cm 3 /g, respectively), whereas the HNO 3 pre-oxidation increased the number of carboxylic groups on the ANF. Upon TEPA loading, pyridinic nitrogen was tethered and further enhanced by pre-oxidation. The surface treatment cumulatively increased the amine content from 5.81% to 13.31%. Consequently, the final adsorption capacity for low (0.3%) and pure CO 2 levels were enhanced from 0.20 and 1.89 to 0.33 and 2.96 mmol/g, respectively. Hence, the two-step pre-oxidation and TEPA treatments were efficient for improved CO 2 affinity.