Adsorption of Cr(VI) by insolubilized humic acid

The adsorption of hexavalent chromium by insolubilized humic acid was investigated.The effects of reaction time,pH value,dosage of insolubilized humic acid,illumination condition,temperature on the reaction were studied,and the optimal reaction conditon was determined,meanwhile,the treatment effect by the insolubilized humic acid was compaired with that by the untreated humic acid.The results of the test showed that,when the reac-tion time was 60 min,the pH value was 7,the dosage of insolubilized humic acid was 5 g/L,the mass concentration of Cr(Ⅵ) was 5.36 mg/L,the removal rate of chromium ions by the insolubilized humic acid could reach 95%,which was almost 2 times the removal rate by the untreated humic acid.Besides,the kinetic curves and adsorption isotherm curves of chromium ions affected by insolubilized humic acid were drawn.