Experimental Study on Cr6+ Adsorption in Water about the Daily Waste Peanut Shell

The peanut shell was used as the adsorbent of Cr6+ in this paper. A series experiences have been discussed and studied through the following three aspects, which were the adsorption time, modification effect and contact area. The results showed that the peanut shell for the removal rate of Cr6+ presented increasing tendency over time. In condition of 25°C, 1.0g unmodified peanut shell,50mL 30mg·L-1 Cr6+ solution, the initial pH value 1.0 and contact time 300min, the adsorption rate of Cr6+ was only 71%. In the same conditions, the removal rate of modified peanut shell was 75%, compared to the unmodified increasing by 4%. Thus modified treatment for peanut shell has no significant effect on the adsorption effect. And In condition of 25°C, 50mL 30mg·L-1 Cr6+ solution, the initial pH value 1.0 and contact time 270min, the removal rate of 1.0g modified peanut shell was 75%, but the modified peanut shell powders removal rate was 99%, representing an increase of 25% before crushing, thus to increase the contact area can improve the adsorption effect.