Cationic Polymer Grafted-Bentonite by Ce(IV)-Redox System for Adsorption of the Anionic Dye

摘要

Modified bentonite was prepared by grafting poly(2-(acryloyloxy)ethyl)trimethyl ammonium chloride by a Ce(IV)-redox process to remove an anionic dye, brilliant yellow (BY). The BY removal efficiency changed with pH, temperature and reaction time. The adsorption capacity for BY decreased slightly with value of pH enhanced from 2.0 to 10.0 in solution. Kinetics models and isotherms models were used to match the adsorption behavior. Adsorption kinetics showed the adsorption was a fast course, achieving balance within 180 min and could be described well by the pseudo-second-order model. The thermodynamic equilibrium data showed that the adsorption isotherm matched with Langmuir model. Results represented that the adsorption capacity increased greatly by grafting PDAC on bentonite and the maximum adsorption capacity could reach to 302.9 mg/g.