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다양한 온도 조건에서 제조한 크라프트 리그닌 탄화물의 특성 및 슈퍼커패시터로의 적용
저스틴알프레드페 ( Justin Alfred Pe Iii ),전세진 ( Se-jin Jeon ),길명섭 ( Myung-seob Khil ),문성필 ( Sung-phil Mun ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
Kraft lignin (KL) was carbonized at temperatures ranging from 600 °C to 1200 °C under inert atmosphere to investigate their performance as an electrode material in symmetrical supercapacitors. The carbonized samples (KL 600 to KL 1200) were characterized by elemental analysis, X-ray photoelectron spectroscopy, X-ray diffraction, Raman spectroscopy, and electrochemical characterizations. Characterization studies indicated that KL carbonized at lower carbonization temperatures produced graphitic structures. Based from the results of electrochemical characterizations, KL carbonized at 700 °C (KL 700) showed the highest specific capacitance of 45.7 F/g at 0.3 A/g among all carbonized samples. Moreover, purification by boiling and rinsing with water improved the specific capacitance of KL 700 to 62.1 F/g at 0.3 A/g. Consequently, the outcomes suggest that KL are potential precursors for electrode materials in supercapacitors.
TiO<sub>2</sub>-Carbonized Medium Density Fiberboard for the Photodegradation of Methylene Blue
페¸저스틴알프레드III ( Justin Alfred Iii Pe ),이민 ( Min Lee ),문성필 ( Sung Phil Mun ) 한국목재공학회 2020 한국목재공학회 학술발표논문집 Vol.2020 No.1
TiO<sub>2</sub>-carbonized medium density fiberboard (TiO<sub>2</sub>-cMDF) was investigated for the adsorption and subsequent four photodegradation cycles of methylene blue (MB, 10 ppm) under a UV-C (254 nm) light source in a 500-mL glass reactor. The third and fourth cycles of photodegradation were performed differently from the first and second cycles. Photodegradation rate constants of the first and second cycles were 11.0x10<sup>-3</sup>/h and 8.6x10<sup>-3</sup>/h, respectively. After the second cycle, the TiO<sub>2</sub>-cMDF was rinsed with water, dried, and subjected to the next cycle. Photodegradation rate constants of the third and fourth cycles were 8.8x10<sup>-3</sup>/h and 5.9x10<sup>-3</sup>/h, respectively. The results of the second (unrinsed) and third (rinsed) cycles were comparable; however, the results of the fourth (rinsed) cycle were different than those of the third cycle, indicating that rinsing did not influence the results any further. Elemental analysis by SEM-EDX showed that a large amount of Ti was removed during the entire experimental period, nonetheless TiO<sub>2</sub>-cMDF attained 99% removal of MB even after repeated use. Consequently, the results indicate that TiO<sub>2</sub>-cMDF is an effective photocatalytic biocomposite and can be integrated in the final stages of wastewater treatment.