[논문]질소 플라즈마 처리된 활성탄소를 이용한 테트라사이클린의 물리 및 화학 흡착 특성

이인우; 명성재; 민충기; 하성민; 천서영; 이영석

doi:10.14478/ace.2023.1087

[국내논문] 질소 플라즈마 처리된 활성탄소를 이용한 테트라사이클린의 물리 및 화학 흡착 특성
Physical and Chemical Adsorption Properties for Tetracycline Using Activated Carbon with Nitrogen Plasma Treatment

공업화학 = Applied chemistry for engineering, v.35 no.1, 2024년, pp.8 - 15

이인우 (충남대학교 응용화학공학과) , 명성재 (충남대학교 응용화학공학과) , 민충기 (충남대학교 응용화학공학과) , 하성민 (충남대학교 응용화학공학과) , 천서영 (충남대학교 응용화학공학과) , 이영석 (충남대학교 응용화학공학과)

초록
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본 연구에서는 활성탄소의 테트라사이클린 흡착성능을 향상시키기 위해 5, 10, 및 15분의 시간에 따른 질소 플라즈마 처리를 실시하였다. 모든 질소 플라즈마 처리된 활성탄소는 미처리 활성탄소와 비교하여 테트라사이클린 흡착성능이 개선되었다. 이는 활성탄소에 도입된 질소 작용기가 테트라사이클린과 π-π 상호작용 및 수소 결합을 통하여 화학흡착을 야기하기 때문이다. 특히, 80 W 및 50 kHz의 질소 플라즈마 처리에서, 10분 동안 처리된 활성탄소가 가장 우수한 흡착성능을 가졌다. 이 때, 활성탄소 표면의 질소 함량은 2.03%이며 비표면적은 1,483 m²/g까지 증가하였다. 이렇게 질소플라즈마 처리에 의해 개선된 활성탄소는 물리 및 화학 흡착성능이 향상되었다. 또한, 흡착 실험 결과가 Langmuir 흡착등온식과 유사 2차 반응속도식에 잘 부합하므로, 질소 플라즈마 처리된 활성탄소의 테트라사이클린 흡착은 단분자층으로 이루어지는 화학 흡착이 주도적으로 일어나는 것으로 판단하였다. 결과적으로, 질소 플라즈마 처리된 활성탄소는 주도적인 화학 흡착과 더불어 물리 흡착의 시너지 효과로 수중에서 테트라사이클린을 효율적으로 제거하는 흡착재로 사용될 수 있다.

Abstract ▼ AI-Helper

In this study, nitrogen plasma treatment was performed in 5, 10, and 15 minutes to improve the tetracycline adsorption performance of activated carbon. All nitrogen plasma-treated activated carbons showed improved tetracycline adsorption compared to untreated activated carbons. The nitrogen functional groups in activated carbon lead to chemisorption with tetracycline via π-π interactions and hydrogen bonding. In particular, in the nitrogen plasma treatment at 80 W and 50 kHz, the activated carbon treated for 10 minutes had the best adsorption performance. At this time, the nitrogen content on the surface of the activated carbon was 2.03% and the specific surface area increased to 1,483 m2/g. As a result, nitrogen plasma treatment of activated carbon improved its physical and chemical adsorption capabilities. In addition, since the adsorption experimental results were in good agreement with the Langmuir isotherm and pseudo-second order model, it was determined that the adsorption of tetracycline on the nitrogen plasma-treated activated carbon was dominated by chemical adsorption through a monolayer. As a result, nitrogen plasma-treated activated carbon can be used as an adsorbent to efficiently remove tetracycline from water due to the synergistic effect of physical adsorption and proactive chemical adsorption.

주제어

표/그림 (12)

그림 Figure 1. N1s XPS spectra of (a) AC-N5, (b) AC-N10 and (c) AC-N15.
표 Table 1. XPS Analysis of ACs with Nitrogen Plasma Untreated and Treated
표 Table 2. N1s Peak Components of Nitrogen Plasma Treated ACs
그림 Figure 3. Tetracycline adsorbs properties (a) at different concentrations and (b) at different times.
그림 Figure 2. (a) Nitrogen isotherms at 77 K, (b) pore size distribution of untreated and nitrogen plasma treated ACs.
표 Table 3. Pore Structure of ACs according to Nitrogen Plasma Treatment
그림 Figure 4. Tetracycline adsorbs properties of AC-N10 at different temperature.
그림 Figure 5. Adsorption mechanism between tetracycline and nitrogen plasma treated activated carbon.
그림 Figure 6. Langmuir and Freundlich isotherm for tetracycline on AC-N10.
그림 Figure 7. Pseudo first order and pseudo second order model for tetracycline on AC-N10.
표 Table 4. Isotherm Parameters of Langmuir and Freundlich for AC-N10
표 Table 5. Kinetic Model Parameters of Pseudo First Order and Pseudo Second Order Model for AC-N10

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