| 학회 | 한국재료학회 |
| 학술대회 | 2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 | 27권 2호 |
| 발표분야 | E. 환경/센서 재료 분과 |
| 제목 | N2/Ar plasma-engineering surface functionalization of graphene nanoplatelets for catalytic hydrolysis of cellulose |
| 초록 | Heterogeneous catalysis is a promising technology in biomass valorization of its high reactivity, easy post-separation, great recyclability compared to homogeneous catalysis. Advances in material design and surface modification in recent years promoted the development of appealing heterogeneous catalytic materials for biomass conversion. Various functionalized catalytic materials have emerged as promising alternatives to the homogeneous liquid acid catalyst, such as carbon materials, metal-organic frameworks, and metal nanoparticles. Various types of carbon acid catalyst have been investigated. The widely distributed active acidic groups endow the carbon acid catalysts with considerable catalytic ability, including hydroxyl groups (-OH), carboxyl groups (-COOH), and sulfonic groups (-SO3H). Among them, -OH and -COOH on the carbon acid catalysts act as connection center to access cellulose, where -SO3H serves as the active site to cut off the linkage between glucose units in cellulose biopolymer. So, the surface modification of carbon with functional domains becomes the determining step to producing efficient carbon acid catalysts. The introduction of acid groups onto carbon structure mainly relies on the hydrothermal or reflux method in previous studies. However, hazardous chemicals are necessary for these methods, such as concentrated sulfuric acid (95-98%), chlorosulfonic acid, fuming sulfuric acid, or 4-Benzenediazoniumsulfonate under elevated temperature for dozens of hours. The surface functionalization of graphene nanoplatelets catalysts (GNPs) with -OH, -COOH, and -SO3H groups for cellulose hydrolysis was investigated via gas-liquid interfacial plasma (GLIP) sulfonation system under 1M H2SO4. The sulfonation chemistry of the GLIP process was examined under different gas ratios of N2 / Ar (100%N2, 70%N2 -30%Ar, 30%N2-70%Ar). The balance between plasma-induced physical activation and chemical reaction plays an essential part in the sulfonation performance. Experiments on acidic group determination and catalysis ability test demonstrated that the addition of 30 % Ar to N2 exerts a positive effect on enhancing the sulfonation activity and catalytic stability of GNPs. |
| 저자 | Qin Lusha, SungHo Lee, Li Oi Lun Helena |
| 소속 | Pusan National Univ. |
| 키워드 | Surface treatment; gas-liquid interfacial plasma; carbon acid catalyst; biomass conversion |
