Zeta-potentials of Oxygen and Nitrogen Enriched Activated Carbons for Removal of Copper Ion
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서지정보
ㆍ발행기관 : 한국탄소학회
ㆍ수록지정보 : Carbon Letters / 8권 / 4호
ㆍ저자명 : Kwan-Ho Park, Chang-Ho Lee, Seung-Kon Ryu, Xiaoping Yang
ㆍ저자명 : Kwan-Ho Park, Chang-Ho Lee, Seung-Kon Ryu, Xiaoping Yang
목차
1. Introduction2. Experimental
3. Results and discussion
4. Conclusions
References
한국어 초록
The oxygen and nitrogen enriched activated carbons were obtained from modification of commercial activated carbon by using nitric acid, sodium hydroxide and urea. Zeta-potentials of modified activated carbons were investigated in relation to copper ion adsorption. The structural properties of modified activated carbons were not so much changed, but the zeta-potentials and isoelectric points were considerably changed. The zeta-potential of nitric acid modified activated carbon was the most negative than other activated carbons in the entire pH region, and the pHIEP was shifted from pH 4.8 to 2.6, resulted in the largest copper ion adsorption capacities compare with other activated carbons in the range of pH 3~6.5. In case of urea modified activated carbon, copper ion adsorption was larger than that of the as received activated carbon from pH 2 to pH 6.5 even though the pHIEP was shifted to pH 6.0, it was due to the coordination process operated between nitrogen functional groups and copper ion. The adsorption capacity of copper ion was much influenced by zeta-potential and pHIEP of carbon adsorbent.Keywords : Zeta-potential, Activated carbon, Copper ion adsorption
영어 초록
The oxygen and nitrogen enriched activated carbons were obtained from modification of commercial activated carbon by using nitric acid, sodium hydroxide and urea. Zeta-potentials of modified activated carbons were investigated in relation to copper ion adsorption. The structural properties of modified activated carbons were not so much changed, but the zeta-potentials and isoelectric points were considerably changed. The zeta-potential of nitric acid modified activated carbon was the most negative than other activated carbons in the entire pH region, and the pHIEP was shifted from pH 4.8 to 2.6, resulted in the largest copper ion adsorption capacities compare with other activated carbons in the range of pH 3~6.5. In case of urea modified activated carbon, copper ion adsorption was larger than that of the as received activated carbon from pH 2 to pH 6.5 even though the pHIEP was shifted to pH 6.0, it was due to the coordination process operated between nitrogen functional groups and copper ion. The adsorption capacity of copper ion was much influenced by zeta-potential and pHIEP of carbon adsorbent.Keywords : Zeta-potential, Activated carbon, Copper ion adsorption참고 자료
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