Biosorption of 17 alpha-ethinylestradiol by yeast biomass from ethanol industry in the presence of estrone

Author(s)

Debs, Karina Bugan ; Torres da Silva, Heron Domingues ; Leite de Moraes, Maria de Lourdes ; Vasconcelos Martins Carrilho, Elma Neide ; Lemos, Sherlan Guimaraes ; Labuto, Georgia

• Document type: Journal article
• Source: Environmental Science and Pollution Research; v. 26, n. 28, p. 10-pg., 2019-10-01.

Abstract

Yeast biomass from ethanol industry (YB) was evaluated as a biosorbent to 17a alpha-ethinylestradiol (EE) alone and along with estrone (EST). This material is rich in sorption sites and has a good cost-benefit ratio, since it is an industrial residue largely produced (around 30 g for each liter of ethanol). A 2(k)-factorial design was carried out to evaluate the sorption capacity of YB for EE considering the variables pH, biosorbent dose (BD), and ionic strength (IS), at two hormone concentration (HC) levels. The best conditions assessed for individual EE adsorption (pH = 10, IS = 0.1 mol/L, and BD = 0.5 mg/L) were also established for adsorption carried out in the presence of EST. Individuals EE and EST experimental sorption capacities (SCexp) were, respectively, 24.50 +/- 0.07 and 0.80 +/- 0.07 mg/g, fairly similar to Q(max) (EE, 21.41 +/- 1.27 mg/g; EST, 0.93 +/- 0.075 mg/g) from Langmuir model. The Freundlich model best fitted the experimental data for EE adsorption (r(2) = 0.9925;chi(2) = 0.5575). The study carried out in the presence of ESTshowed an associative/competitive sorption process between EE and EST, which may be explained by their similar chemical structures and organic carbon-water partition coefficients K-oc. (AU)

• FAPESP's process: 16/06271-4 - Development of adsorbents from yeast biomass residue from industrial fermentation processes to remove emerging contaminants from water and effluents
• Grantee: Geórgia Christina Labuto Araújo
• Support Opportunities: Regular Research Grants