CHROMIUM(VI) SORPTION ON QUATERNIZED RICE HULLS

The sorption of Cr(VI) from synthetic solution and electroplating wast e by quaternized rice hulls was investigated under laboratory conditio ns to assess its potential in removing Cr(VI). The results show that q uaternized rice hulls provided higher sorption capacity and a more wor kable pH range as compared to the untreated rice hulls. From the Langm uir isotherm the maximum sorption capacity of Cr(VI) was 32.3 mg/g at pH 4.82 at 25 degrees C. Column studies showed that Cr(VI) and Cu(ll) from electroplating waste could be successfully removed or reduced usi ng a combination of untreated and quaternized rice hulls. The effect o f different anions on the sorption capacity of quarternized rice hulls was discussed.