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제117회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Magnetite Graphene Oxide Encapsulated in Sodium Alginate Beads – A Versatile Absorbent for the Enhanced Adsorption of Cr(VI) and As(V) from Aqueous Solutions: the Role of Metal Cross-link in pH Control

등록일
2016년 2월 25일 12시 24분 14초
접수번호
1942
발표코드
ENVR.P-516 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 22일 (금요일) 13:00~14:30
발표형식
포스터
발표분야
환경에너지
저자 및
공동저자
오다솜, 장윤석*
포항공과대학교(POSTECH) 환경공학부, Korea
Graphene oxide, synthesized by using modified Hummers method, has been utilized effectively for the adsorption of heavy metals owing to its abundant functional groups such as –COOH, –C=O and –OH. The incorporation of graphene oxide with magnetite nanoparticles through co-precipitation enhances the separation of the absorbent by magnetic field avoiding secondary pollutants. However, magnetite graphene oxide appears to be highly dependent on environmental conditions and unstable for the application in actual aqueous systems. Herein, the magnetite graphene oxide was encapsulated inside alginate bead – a nontoxic and highly biocompatible polymer – to form an absorbent for the adsorption of Cr(VI) and As(V). Alginate did not play a significant role in the removal of Cr(VI) and As(V), but acted as a supporter to protect the magnetite graphene oxide from the effect of environment and from aggregation. The results indicated that the composite possessed high independence towards pH, ionic strength and temperature in case of As(V) adsorption. Adsorption capacities were calculated to be 7.84 mg/g and 17.36 mg/g for Cr(VI) and As(V) respectively, much higher than the previous study. The release of ferric ion in Fe3+ cross-link magnetite graphene oxide beads enhanced the removal of Cr(VI) via local pH control mechanism. For the complex mixture of heavy metals, the composite successfully removed around 80% of Cr(VI), 99% of As(V), 99% of Cu(II) and 96% of Cd(II). The absorbent also maintained its reactivity in wastewater and exhibited a greater efficiency in the adsorption of both Cr(VI) and As(V) compared with other carbon-based materials. The magnetite graphene oxide beads could be collected and reused for at least 5 cycles without leaching of inside materials.

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