title: Removal of acid orange 7 by guava seed carbon: a four parameter optimization study.
abstract: The preparation of carbon from waste materials is a recent and economic alternative for the removal of dyes. In this study four samples of carbon were obtained by thermal treatment at 1000 degrees C using as precursor the guava seed with different particle sizes. The Taguchi method was applied as an experimental design to establish the optimum conditions for the removal of acid orange 7 in batch experiments. The chosen experimental factors and their ranges were: pH (2-12), temperature (15-35 degrees C), specific surface area (50-600 m(2)g(-1)) and adsorbent dosage (16-50 mg ml(-1)). The orthogonal array L(9) and the larger the better response category were selected to determine the optimum removal conditions: pH 2, temperature 15 degrees C, S(esp) 600 m(2)g(-1) and dosage 30 mg ml(-1). Under these conditions a total removal of acid orange 7 was achieved. Moreover, the most significant factors were the carbon specific surface area and the pH. The influence of the different factors on the adsorption of acid orange 7 from solution is explained in terms of electrostatic interactions by considering the dye species and the character of the surface.
authors.affiliation: Centro de Química, Instituto de Ciencias, Universidad Autónoma de Puebla, Puebla, Pue, Mexico. melizald@siu.buap.mx
authors.forename: María P
authors.initials: MP
authors.lastname: Elizalde-González
authors.forename: Virginia
authors.initials: V
authors.lastname: Hernández-Montoya
mesh_terms: D001391:Azo Compounds / Q000302:isolation & purification*; D001557:Benzenesulfonates / Q000302:isolation & purification*; D002244:Carbon; D004396:Coloring Agents / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000517:prevention & control; D008962:Models, Theoretical; D031647:Psidium; D012639:Seeds; D013696:Temperature
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D007220:Industrial Waste; D002244:Carbon; C014722:2-naphthol orange