| Abstract: | The sorption of linuron on bentonite desiccated at 110°C untreated, and acid‐treated with H2SO4 solutions over a concentration range between 0.25 M and 1.00 M from aqueous solution at 25°C has been studied by using batch experiments. In addition, column experiments were carried out with the bentonite sample treated with the 1.00 M H 2SO4 solution B‐A(1.00)] by using two aqueous solutions of linuron of different concentrations (C=4.97 mg dm?3 and C=7.63 mg dm?3 ). The experimental data points have been fitted to the Langmuir equation in order to calculate the sorption capacities (Xm) of the samples; Xm values range from 0.02 g kg?1 for the untreated bentonite B‐N] up to 0.20 g kg?1 for the sample acid‐treated with the 1.00 M H2 SO4 solution. The removal efficiency (R ) has also been calculated; R values ranging from 15.86% for the B‐N] sample up to 41.54% for B‐A(1.00)]. The batch experiments show that the acid‐treated bentonite is more effective than the natural bentonite in relation to sorption of linuron. The column experiments show that the B‐A(1.00) sample might be reasonably used in removing linuron, the column efficiency increasing from 61.8% for the C=7.63 mg dm?3 aqueous solution of linuron up to 77.6% for the C=4.97 mg dm?3 one. © 1999 Society of Chemical Industry |
