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Adsorption capacity study of activated carbon of babassu coconut to remove yellow dye tartrazine from aqueous solution

IWRA World Water Congress 2017 - Cancun Mexico
2. Water quality, wastewater and reuse
Author(s): Isabela Reck
Rebecca Paixão
Raquel Gomes
Rosângela Bergamasco
Marcelo Vieira
Angélica Vieira

Isabela Reck
Universidade Estadual de Maringá
isabelareck@hotmail.com
Rebecca Paixão
Universidade Estadual de Maringá
rebeccapaixao@gmail.com
Raquel Gomes
Universidade Estadual de Maringá
rgutti02@gmail.com
Rosângela Bergamasco
Universidade Estadual de Maringá
rosangela.bergamasco@gmail.com
Marcelo Vieira
Universidade Estadual de Maringá
marcelofvieira@hotmail.com
Angélica Vieira
Universidade Estadual de Maringá
amsvieira@uem.br


Keyword(s): wastewater, adsorption, tartrazine, babassu coconut
Poster:

Abstract

With the industry advance, both foods and beverages, the use of synthetic dyes diffuses between different products. Most colorants have complex aromatic molecular structure and functional azo groups (-N = N-) that make them resistant to light, temperature and oxidants. With this feature, the dye does not degrade easily and it can accumulate in aquatic ecosystems. Colored wastewater is unacceptable aesthetically and cause damage to the environment by changing the pH and color and thus influencing the photosynthetic activity of the aquatic ecosystem, chemical oxygen demand and among other problems. Due to toxicity of these dyes, it is extremely important to monitor then so they do not exceed the levels allowed by the current body. In this context, the study in question aimed to remove the yellow dye tartrazine from aqueous solutions using activated carbon of babassu coconut. The adsorption was conducted batchwise, using mechanical shaker, with a dye solution of 15 mg L-1 and 0.2 g of activated carbon. The influences of differents parameters were tested: the contact time, pH, temperature and amount of adsorbent. After 24 hours of contact between activated carbon of babassu coconut and the tartrazine yellow dye it was observed that the solution got in equilibrium at a time of 12 hours (720 min), achieving removal capacity of 3.66 mg g-1. Thus, the next experiments were performed at this time. It was found that the best pH for the dye removal was 3. This result can be explained by the fact that tartrazine is an anionic character molecule, and therefore are attracted by H+ ions present in the solution. The best temperature found for the removal of the dye was 45° C, which characterizes the adsorption with activated carbon of babassu coconut as an endothermic process. It is noted that the amount of tartrazine adsorbed by the adsorbent decreases from 3.66 to 0.50 mg g-1 by increasing the adsorbent mass of 0.2 to 1.5 g. A probable explanation is based on the fact that this adsorbent has a high potential for removing the dye in question, and would only be necessary to use a larger mass at higher concentrations of tartrazine, while for the tested concentration of 0.2 grams promote a good removal. As a conclusion of this study, it can be stated that activated carbon of babassu coconut have a very significant potential in removing pollutants from aqueous solutions. Therefore, the adsorption is a process that can be considered as a preliminary water treatment from food industries so dyes can be removed before being discharged together with the aqueous effluents of industries.With the industry advance, both foods and beverages, the use of synthetic dyes diffuses between different products. Most colorants have complex aromatic molecular structure and functional azo groups (-N = N-) that make them resistant to light, temperature and oxidants. With this feature, the dye does not degrade easily and it can accumulate in aquatic ecosystems. Colored wastewater is unacceptable aesthetically and cause damage to the environment by changing the pH and color and thus influencing the photosynthetic activity of the aquatic ecosystem, chemical oxygen demand and among other problems. Due to toxicity of these dyes, it is extremely important to monitor then so they do not exceed the levels allowed by the current body. In this context, the study in question aimed to remove the yellow dye tartrazine from aqueous solutions using activated carbon of babassu coconut. The adsorption was conducted batchwise, using mechanical shaker, with a dye solution of 15 mg L-1 and 0.2 g of activated carbon. The influences of differents parameters were tested: the contact time, pH, temperature and amount of adsorbent. After 24 hours of contact between activated carbon of babassu coconut and the tartrazine yellow dye it was observed that the solution got in equilibrium at a time of 12 hours (720 min), achieving removal capacity of 3.66 mg g-1. Thus, the next experiments were performed at this time. It was found that the best pH for the dye removal was 3. This result can be explained by the fact that tartrazine is an anionic character molecule, and therefore are attracted by H+ ions present in the solution. The best temperature found for the removal of the dye was 45° C, which characterizes the adsorption with activated carbon of babassu coconut as an endothermic process. It is noted that the amount of tartrazine adsorbed by the adsorbent decreases from 3.66 to 0.50 mg g-1 by increasing the adsorbent mass of 0.2 to 1.5 g. A probable explanation is based on the fact that this adsorbent has a high potential for removing the dye in question, and would only be necessary to use a larger mass at higher concentrations of tartrazine, while for the tested concentration of 0.2 grams promote a good removal. As a conclusion of this study, it can be stated that activated carbon of babassu coconut have a very significant potential in removing pollutants from aqueous solutions. Therefore, the adsorption is a process that can be considered as a preliminary water treatment from food industries so dyes can be removed before being discharged together with the aqueous effluents of industries.

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