폐타이어 표면에 형성되는 Functional group을 이용한 중금속(Cu²+,Cd²+,Pb²+)

Abstract

In this research, based on the fact that the particular Functional group such as -COO^(-), phenolic OH, alcoholic OH form very strong Chelate complexes with the highly oxidized heavy metal ion which makes it effective in removal of minor heavy metal that exist in the water, comparisonanalysis was made on the absorption property(characteristics) of conventional powdered scrap tire with the removal rate of heavy metal ion caused by the powdered scrap tire that transfigured in aqueous solutionby producing the mixed heavy metal solution that contains various heavy metal ion using the pre-treatment method that applies these Functional Group to the surface of the conventional scrap tire. Hydrocyl(OH^(-)) and Carboxyl(COO^(-)) were used as Functional group. Existence and non-existence was verified and particle's structural Chemical banding characteristics were examined through FT-IR. Medium property was understood through XRD, XRF, SEM. Moreover, its eruptingproperty was understood through eruption experiment. Hereafter, through Isotherm ?Kinetics Test and Column Test, individual specific invariable number and maximum absorption amount were found by respectively applying to Ho's model and Thomas model. Based on this, it was possible to explain that the transfiguring characteristics of heavy metal removal caused by transfigured powered scrap tire as surface-binding response and forecast removal mechanism by using the ion exchange balancing system. In conclusion, 1) Both normal scrap tire used in this experiment and chemically transfigured scrap tire through Functional group were below of the specified waste standard and its erupting property showed the erupting tendency in the order of Zn>Cu>F>Pb>Cd>Mn,Ni,Cr. 2) According to the result of FT-IR analysis when removing heavy metal ion using Functional group, the transfiguring characteristics of Functional group can be explained as Complexation reaction. As a result, negative electric charge is created at the surface of the scrap tire and easily bonds with metal ion with positive electric charge to form Chelate complexes which is believed to affect the removal. 3) In the results of Kinetics & Sorption isotherm, the absorption rate by type of heavy metal exhibited a tendency to be consistent in the order of Pb²+>Cu²+>Cd²+ and the absorption balance reached its absorption density within the first 5 min. This result is determined to be the fact that DAT-Functional group of metal ion rapidly spreads over the surface of scrap tire with high absorption, and all the removal rate of metal ion showed to be increased following the increase of ph, and in case of higher than pH8, the removal rate showed to be over 80%. Based on the mentioned test result, we could verify that the removal efficiency rate raised by 15 to 20 times compared to the conventional efficiency rate of scrap tire. 4) The Breakthrough curve was emerged to at about 5 pore point, in case of DAT-OH^(-) it was 400 to 600 pore, and DAT-COO^(-) was observed to be 700~1000pore. This result proved that there is a large difference between each absorption capability, and the absorption continuity was ranked in a order of DAT-COO^(-)>DAT-OH^(-)>DAT. This indicates the removal rate also drops in same order. 5) When the maximum absorption amount was acquired through Tomas Plot, it showed to be Pb²+ 160~230㎎/ℓ Cu²+ 100~180㎎/ℓ Cd²+ 50~60㎎/ℓ, under the maximum absorption rate, the powdered scrap tire implemented by Functional group is concluded to be competitive to the popular active coal, and in aspect of price wise or convenience of use.