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http://dx.doi.org/10.11001/jksww.2012.26.2.275

Adsorption property of heavy metals onto MCM-41 and expanded graphite  

Lee, Myoung-Eun (경남과학기술대학교 환경공학과)
Lee, Chae-Young (수원대학교 토목공학과)
Kang, Seok-Tae (경희대학교 토목공학과)
Kim, Sang-Hyoun (대구대학교 환경공학과)
Cho, Yun-Chul (대전대학교 환경공학과)
Kim, Soo-Hong (SGR 테크)
Chung, Jae-Woo (경남과학기술대학교 환경공학과)
Publication Information
Journal of Korean Society of Water and Wastewater / v.26, no.2, 2012 , pp. 275-283 More about this Journal
Abstract
MCM-41(Mobil's Composition of Matter-41) and expanded graphite(EG) were investigated as potential adsorbents for heavy metal ions including Pb(II), Cu(II) and Ni(II) in various aqueous chemistries. MCM-41 showed shorter equilibrium times and higher adsorption capacities for all three heavy metal ions compared to expanded graphite. The adsorption of three heavy metal ions was significantly affected by the solution pH due to the competition with $H_{3}O^{+}$ at lower pH and precipitation at neutral or higher pH. Adsorptions of heavy metal ions onto MCM-41 and expanded graphite were successfully described with the pseudo-second-order model. During the competitive adsorption of three heavy metal ions, the selectivity of Pb(II) was highest and almost same selectivity was observed with Cu(II) and Ni(II) when MCM-41 was used as an adsorbent, while the expanded graphite exhibited the highest selectivity to Pb(II), followed by Ni(II) and Cu(II).
Keywords
MCM-41; expanded graphite; Heavy metals; Adsorption capacity; Kinetics; Selectivity;
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