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http://dx.doi.org/10.4491/KSEE.2017.39.2.51

Applicability of Natural Zeolite with Different Cation Exchange Capacity as In-situ Capping Materials for Adsorbing Heavy Metals  

Kang, Ku (Research Institute of Agricultural & Environmental Science, Hankyong National University)
Shin, Weon-Ho (Energy Materials Center, Energy & Environment Division, Korea Institute of Ceramic Engineering & Technology)
Hong, Seong-Gu (Department of Bioresources & Rural systems Engineering, Hankyong National University)
Kim, Young-Kee (Department of Chemical Engineering, Hankyong National University)
Park, Seong-Jik (Department of Bioresources & Rural systems Engineering, Hankyong National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.39, no.2, 2017 , pp. 51-58 More about this Journal
Abstract
We investigated the efficiency of natural zeolite with different cation exchange capacity (CEC) as capping material for the remediation of marine sediments contaminated with heavy metals. Three different zeolite with high CEC (HCzeo, 163.74 cmolc/kg), medium CEC (MCzeo, 127.20 cmolc/kg), and low CEC (LCzeo, 70.62 cmolc/kg) were used. The surface area of the zeolite was in decreasing order: HCzeo ($59.43m^2/g$) > MCzeo ($52.10m^2/g$) > LCzeo ($10.12m^2/g$). The results of mineralogical composition obtained from X-ray diffraction (XRD) show that LCzeo was mainly composed of quartz and albite. In the XRD result of MCzeo and HCzeo, the peaks of clinoptilolite, heulandite, and mordenite were also observed along with that of quartz and albite. Sorption equilibrium onto the HCzeo, MCzeo, and LCzeo was reached in 6 h at initial concentration of 10 mg/L and 100 mg/L. Higher adsorption of Cd and Zn onto the zeolite with higher CEC were achieved but adsorption of Cu and Ni were not dependent on the CEC of zeolite. It can be concluded that the zeolite with high cation exchange ability is recommended for the contaminated sediments with Cd and Zn but the inexpensive zeolite with low CEC for Cu and Ni.
Keywords
In-Situ Capping Materials; Reactive Capping; Cation Exchange Capacity; Zeolite; Heavy Metal Adsorption;
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Times Cited By KSCI : 5  (Citation Analysis)
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