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제122회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Graphitic Carbon Nitride-Clay Nanohybrid as A New UV shielding Material

등록일
2018년 8월 30일 17시 40분 37초
접수번호
2145
발표코드
MAT.P-477 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
10월 18일 (목요일) 11:00~12:30
발표형식
포스터
발표분야
Material Chemistry
저자 및
공동저자
Huiyan Piao, Goeun Choi, Jin-ho Choy*
Department of Chemistry and Nano Science, Ewha Womans University, Korea
Graphitic carbon nitride (g-C3N4) has received a great attention not only due to its unusually high chemical and thermal stability, but also its various physico-chemical functions applicable for visible light harvesting photocatalyst, metal-free catalyst, reactive template and nitrogen source of nitridation reaction. In this study, we developed a novel soft chemical route to g-C3N4 nanosheets confined in 2D nanoreactor (Mica) by intercalating cyanamide, a precursor of g-C3N4, into layered mica and its subsequent pyrolysis. In brief, cyanamide was first intercalated into mica via solid state reaction at 100°C for 3 hrs to form cyanamide-mica nanohybrid. The cyanamide in the interlayer space of mica was polymerized to g-C3N4 at 550°C for 4hrs. According to the X-ray diffraction (XRD) and transmission electron microscope (TEM) analyses, the basal spacing of mica (0.96 nm) was expanded to 1.50 nm for cyanamide-mica and 1.28 nm for g-C3N4-mica nanohybrids, respectively, indicating that cyanamide was successfully intercalated into interlayer space of mica and polymerized to g-C3N4 with single supramolecular structure. The intergallery height of g-C3N4-mica nanohybrid was determined to be 0.32 nm which is exactly the same as the single atomic layer thickness of graphite indicating the formation of single sheet g-C3N4. The g-C3N4-mica nanohybrids as well as bulk g-C3N4 showed excellent UV absorption properties below 450 nm. However, the photocatalytic activity of g-C3N4–mica hybrid was almost quenched, due to the effective screening of photoactive site by insulating mica. It is, therefore, concluded that the present g-C3N4 –mica could be applicable as the UV-screening agent due to its excellent UVA-UNB-UVC (200~400 nm) screening property without any photocatalytic degradation and phototoxicity.

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