Removal of Cd^(2+) from aqueous solution using graphene oxide modified activate carbon derived from peanut shell

Graphene oxide(GO)was prepared by a modified Hummers method using peanut shells and natural graphite,and graphene oxide modified peanut shells activated carbon composites(GO-AC)were synthesized by co-pyrolysis.The optimal preparation conditions of AC were screened by response surface methodology(RSM)to optimize the preparation process.The results showed that the surface of GO-AC had more micropores and larger specific surface area,increased the surface adsorption sites and had more oxygen-containing functional groups.The adsorption process was mainly based on chemisorption,and the adsorption capacity was 3.45 and 1.30 times higher than that of BC(45.16 mg/g)and AC(119.21 mg/g),respectively.After six adsorption-desorption cycle tests,the adsorption amount of Cd^(2+)by GO-AC was still as high as 89.26 mg/g,with a percentage increase of 93.5%and 365%compared to BC(19.18 mg/g)and AC(46.13 mg/g),respectively,with good reusability.The research can provide a useful reference for the high value-added conversion of waste biomass,and GO-AC loading modified with significant adsorption of Cd2+has good potential for application as a novel and low-cost adsorbent.