Cr(VI) is a toxicant with high water solubility and mobility, causing biological toxic and human carcinogen. The existing treatment technologies of Cr(VI) such as ion exchange and neutralization-precipitation have drawbacks that are high cost and toxic sludge generation. Therefore, meso-ZVI (zero valent iron) as a catalyst was applied for Cr(VI) removal to overcome the limitations of the existing technologies. For this process, the parameters affecting Cr(VI) removal reaction and the relation between the parameters and the Cr(VI) reduction constant were investigated. The effects of particle sizes of ZVI, ZVI dosage, initial pH condition, and slag addition on Cr(VI) removal reaction were tested. The physicochemical surface changes of ZVI catalyst before and after the Cr(VI) removal reaction were observed through FE-SEM and EDS analysis. When the Cr(VI) removal tests were carried out according to sizes of ZVI and ZVI dosages, the result showed that both the specific surface area and dosage of ZVI were linearly proportional to Cr(VI) reduction reaction constant. In the case of initial pH conditions, in above pH 5, it showed the kinetic of Cr(VI) removal was remarkably decreased.
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