Novel Chitosan-MOF Composite Adsorbent for the Removal of Heavy Metal Ions

A novel chitosan-MOF composite was first synthesized and used in the adsorptive removal of heavy metal ions. The effects of time, temperature, and pH were investigated. The results show that after 8 h of adsorption, the maximum adsorption capacity of Cr(VI) was 93.6 mg g(-1) at pH 2 and a temperature of 40 degrees C. The adsorption capacity of Cu(II) was 50.6 mg g(-1) at pH 5 and 60 degrees C, while that of Ni(II) reached about 60mg g(-1) at pH 5 and 20 degrees C. The adsorptive mechanism was a pseudo-second-order model (R-2 > 0.979). The chitosan-MOF composite performs well in the removal of heavy metal ions.