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DOI : ,    Vol.19, No.2, 29 ~ 37, 2011
Title
Organo-Sericite for the Removal of As(3) and As(5) from Aqueous Solution
김무늬 Mun Ni Kim , 이승목 Seung Mok Lee
Abstract
Several methods are proposed for the remediation of arsenic contaminated aquatic environment including the oxidation, precipitation, coagulation, membrane filtration etc. However, these methods are either expensive or not to address the stringent regulation as stated by the US-EPA i.e., 10 ppb (0.01 mg/L) in the water. Hence, in a line the present communication dealt with exploring the possibility of organically-modified sericite for the removal of arsenic from water bodies. The interlayer spacing of (002) plane was reported to be 10A contained with exchangeable potassium ions within the interlayer gallery. This exchangeable potassium ion was exchanged with two different ionic cations viz., tetramethyl ammonium chloride (T) and dimethyldioctadecyl ammonium chloride (D) as to obtain the two different organo-sericite samples for each organic cations i.e., T1, T2 and D1, D2 where 1 and 2 indicated the organic cations introduced with 1 and 2 times of CEC (cation exchange capacity) of sericite. The batch data obtained showed that at pH around 4~5 a maximum removal of As(III) Ca. 40% and As(V) Ca. 60% occurred with sample T1 using 2mg/L of initial arsenic concentration. Samples T2, D1 and D2 comparatively showed less removal efficiency for arsenic. Further, the effect of ionic strength (from 0.0001 to 0.1mol/L of NaNO3) and the presence of phenol (0.5 to 3mg/L), showed that the uptake of the set ions i.e., As(III) and As(V) were almost un affected with the se changes. Column data obtained as to assess the applicability of the se solids under the dynamic conditions. Results obtained by column experiments showed that the maximum removal capacity for As(III) using sample T was found to be 0.8259mg/g.
Key Words
Sericite, Tetramethyl Ammonium Chloride, Dimethyldioctadecyl Ammonium Chloride, Organo-clay, As(4), As(5)
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