ABSTRACT In the present study, the use of the rice husk biomass as an alternative biosorbent for treating the estrone, 17 β-estradiol, and estriol hormones in monocomponent and multicomponent systems was investigated. The high-performance liquid chromatography technique (HPLC-UV) was applied in order to quantify the hormones, validating this method according to ANVISA and INMETRO. The biosorbent presented functional groups typical of cellulose, hemicellulose, lignin, and proteins, with an amorphous, fibrous, and porous surface. The best performance was obtained with a neutral pH and at room temperature (25C). The equilibrium times in batch systems were 60 min for the estrone, and 120 min for 17 βestradiol and estriol. The monocomponent kinetics of adsorption of estrone and estriol were adequately described by the pseudo-first-order model, whereas for the 17 β estradiol both pseudo-first-order and pseudo-second-order models well described the experimental data. For the multicomponent system, the kinetics of adsorption was appropriately represented by the pseudo-first-order model, demonstrating that the number of active sites was the limiting factor of the process. The monocomponent adsorption isotherms were adequately fitted by the Langmuir model, reaching adsorption capacities of 2.698, 1.649, and 0.979 mg g−1 for the estrone, 17 βestradiol, and estriol hormones, respectively. The ternary isotherm models did not represent the experimental data, indicating that there was no competition among the hormones. The reactions presented favourable and spontaneous characteristics. The rice husk biomass showed a great potential as an adsorbent when treating effluents contaminated with hormones. GRAPHICAL ABSTRACT

中文翻译：

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稻壳对天然激素雌酮、17β-雌二醇和雌三醇的吸附：单组分和多组分动力学和平衡

摘要 在本研究中，研究了使用稻壳生物质作为替代生物吸附剂来处理单组分和多组分系统中的雌酮、17 β-雌二醇和雌三醇激素。应用高效液相色谱技术 (HPLC-UV) 来量化激素，并根据 ANVISA 和 INMETRO 验证了该方法。生物吸附剂具有纤维素、半纤维素、木质素和蛋白质的典型官能团，具有无定形、纤维状和多孔表面。最佳性能是在中性 pH 值和室温（25℃）下获得的。分批系统中雌酮的平衡时间为 60 分钟，17 β-雌二醇和雌三醇的平衡时间为 120 分钟。拟一级模型充分描述了雌酮和雌三醇吸附的单组分动力学，而对于 17 β 雌二醇，伪一阶和伪二阶模型都很好地描述了实验数据。对于多组分系统，吸附动力学由拟一级模型适当表示，表明活性位点的数量是该过程的限制因素。Langmuir 模型对单组分吸附等温线进行了充分拟合，对雌酮、17 β-雌二醇和雌三醇激素的吸附容量分别为 2.698、1.649 和 0.979 mg g-1。三元等温线模型不代表实验数据，表明激素之间不存在竞争。反应呈现出有利和自发的特性。在处理受激素污染的污水时，稻壳生物质显示出作为吸附剂的巨大潜力。图形概要