Evaluation of the Removal of the Corante Remazol Black B in Effluent TÃxteis Using as Adsorvente the Mesocarpo of the Green Coconut / AvaliaÃÃo da RemoÃÃo do Corante Remazol Black B em Efluentes TÃxteis Utilizando como Adsorvente o Mesocarpo do Coco Verde
Carla Cristiane Andrade Leal
DATA DE PUBLICAÇÃO
In the textile industry dyes i excess used in the coloring processes are eliminated with the effluents causing serious environmental problems. So, to control pollution great efforts are being innested to remove these dyes from the effluents. One technique usually adopted is adsorption, as it has lower costs when compared to other. On this work mesocarp powder of green coconuts was used, because it is abundant and of a very low price. The coconut was colected at a farm in Olinda, Pernambuco, dried at 60ÂC and grinded with a hammer mill and treated with albumin (40,0 g/L of water) to extract the tannic. To evaluated the influence of the agitation (300-700 rpm), pH (4.0-7.2), adsorbent granulometry (>0.149-0.42 mm) on the adsorption process, a two level factorial experimental design was employed. The expeiments were performed at 30ÂC and atmospheric pressure, batch wise and with a synthetic dye solution of âRemazol Black Bâ, simulating an effluent of a textile industry. The kinetic expeiments were conducted in 50 mL beckers with the adsorbent, in a dye solution at a concentration of 10 mg/L and a buffer of monobasic potassium phosphate-dibasic sodium phosphate at a pH 4.0. After filtering, the dye concentrations were analyzed with a spectrophotometer, FEMTO-435, at a wavelength of 597 nm. Equilibrium experiments were performed in erlenmeyers with 5g of adsorbents at a granulometry >0.149 in 25 mL dye solutions at concentration in the range of 10 to 70 mg/L at an agitation of 700 rpm. The dye concentration was quantified through a previously prepared reference curve. The results indicated that 88% of the dye was removed with a maximum adsorption capacity of 2,93 mg/g. and keq = 0.26 L/mg. The experimental model was adjusted to a second order Langmuir model and the adsorption constant was 3.31 L/g.h.
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