Formation and characteristics of bentonite/cationic starch composite as adsorbent for acid red G dye

摘要

In order to increase the adsorption capacity of bentonite, a novel and cost-effective cationic starch(CS) intercalated raw bentonite(RB) composite matrix was prepared by controlling the weight ratio of RB and CS. The intercalated microstructure of the RB/CS composite was then characterized by Fourier transform infrared spectroscopy (FTIR), X-ray-diffraction (XRD), respectively. The acid red G adsorption from aqueous solution on RB/CS composite was studied using batch technique and compared with the adsorption onto RB under various parameters such as weight ratio of RB to CS, initial dye concentration, contact time, pH, and adsorbent dosage. It was found that more than 90% of the dye from 100 ml L~(-1) solution was removed by RB/CS composite under the optimal conditions and it had a higher color removal efficiency and a shorter adsorption equilibrium time compared with the RB as the adsorbent for acid red G dye. In summary, the result showed that RB/CS could be as a kind of low-cost material for the removal of acid red G from aqueous solution.