The goal is to determinate the technical feasibility of using agroindustrial wastes for adsorption of dyes. The pHpzc of Brewer�s spent\r\ngrains and Orange peel is 5.3 and 3.5, respectively. The equilibrium isotherms of Basic Blue 41, Reactiive Black 5, and Acid Black 1\r\nwere carried out without pHs control which ranging between 4 and 5.5. The equilibrium concentrations for both adsorbents were\r\nfitted by the Freundlich and Langmuir models. The maximum adsorption capacity measured for Basic Blue 41, Reactive Black 5,\r\nand Acid Black 1 was 32.4, 22.3, and 19.8 mg g-1 for Brewer�s spent grains; and 157, 62.6, and 45.5 for orange peel, respectively. The\r\nkinetic of process was fitted by the model of pseudo-second order. The constant rate for orange peel decreased to extend the initial\r\nconcentration of dye increased, obtaining 4.08 * 10-3-0.6 * 10-3 (Basic Blue 41), 2.98 * 10-3-0.36 * 10-3 (Acid Black 1), and\r\n3.40 * 10-3-0.46 * 10-3 gmg-1 min-1 (Reactive Black 5). The best removal efficiency was obtained in orange peel with values\r\nstarted from 63% to 20%. Consequently, according the results obtained there are two positive effects, the reuse of agricultural\r\nwastes and its use as low-cost adsorbent of the dyes.
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