Removal of 3—(3,4—dichlorophenyl)—1, 1 dimethylurea from aqueous solution by natural and activated bentonite

✍ Scribed by E. González-Pradas; M. Villafranca-Sánchez; M. Socias-Viciana; J. Castillo-Sánchez; M. Fernández-Pérez

• Publisher: Wiley (John Wiley & Sons)
• Year: 2007
• Tongue: English
• Weight: 383 KB
• Volume: 56
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/jctb.280560112

✦ Synopsis

The adsorption of 3-(3,4-dichlorophenyl)-lI 1 dimethylurea (diuron) on bentonite desiccated at 110°C untreated, and acid treated with H,SO, solutions over a concentration range between 0.25 M and 5.00 M, from aqueous solution at 30°C has been studied. In addition, adsorption of diuron on combined acid/heat treated samples (0.50 M and 2.50 M H2S0,/200"C and 400°C) has also been studied.

The experimental data points have been fitted to the Freundlich equation in order to calculate the adsorption capacities ( K ) of the samples; K values range from 0.92 pg g-' for the untreated bentonite up to 974.42 pg g-' for the 050 M H2S0,/400"C acid/heat treated bentonite. The removal efficiency ( R ) has also been calculated; R values ranging from 2.02 YO for the untreated bentonite up to 97.17 O h for the 0.50 M H,S0,/400°C acid/heat treated bentonite. The adsorption experiments show that bentonite heat treatment is more effective than bentonite acid treatment in relation to adsorption of diuron.