Journal
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Volume 22, Issue 1, Pages 21-29Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0103-50532011000100003
Keywords
mesocarp; epicarp; babassu coconut; adsorption; dye textile
Categories
Funding
- CAPES
- FAPEMA
- CNPq
- FAPESP
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The mesocarp and epicarp components of the babassu palm tree were applied as novel alternative biosorbents for copper phtalocyanine textile dye removal from aqueous solutions. The natural biopolymers were characterized by elemental analyses, solid state C-13 NMR, infrared spectroscopy, thermogravimetric analysis and X-ray diffractometry. Results demonstrated that the compositions of the mesocarp and epicarp are similar to those of other lignocellulosic materials, and that they were very effective for removal of the textile dye Turquoise Remazol. A pseudo second-order kinetic model resulted in the best fit with experimental data for both epicarp and mesocarp (R-2 = 0.999), providing rate constants of sorption, k(2), of 0.31 and 1.43 g mg(-1) min(-1), respectively. The Langmuir and Freundlich isotherm models were employed for adsorption analysis of the experimental data in their linearized forms. The second model resulted in the better fit for Turquoise Remazol dye, which presented maximum adsorption of 1.44 and 2.38 mg g(-1) at pH 6.0 for mesocarp and epicarp, respectively.
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