Experimental Study on Cr<sup>6+</sup> Adsorption in Water about Corncob

The crude material, corncob, was treated with Cr6+. The product was used adsorbing material of Cr6+. With regard to corncobs, this paper studied the absorption time and modification effect between absorbent and Cr6+ . It could be concluded that the removal ratio of Cr6+ presents an increasing tendency over time and reaches the highest removal ratio at 97% after 250 minutes, which improved 18% compared with unmodified corncob. Besides, it also used branches and peanut shells as comparative materials. Through comparing the test data of three materials, it is found that corncob has a higher absorption rate of Cr6+ than peanut shells at 23% and branches at 11%, which suggests that corncob has the best absorbing effect on Cr 6+ .