Vieira Ludmila Cabreira, de Araujo Leandro Goulart, de Padua Ferreira Rafael Vicente, da Silva Edson Antonio, Canevesi Rafael Luan Sehn, Marumo Júlio Takehiro
Instituto de Pesquisas Energéticas e Nucleares, Av. Prof. Lineu Prestes, 2242 - Cidade Universitária, São Paulo, SP, 05508-000, Brazil.
Itatijuca Biotech, Av. Prof. Lineu Prestes, 2242, USP/IPEN/CIETEC, Sala 107 - Cidade Universitária, São Paulo, SP, 05508-000, Brazil.
J Environ Radioact. 2019 Jul;203:179-186. doi: 10.1016/j.jenvrad.2019.03.019. Epub 2019 Mar 27.
Biosorption-based technologies have been proposed for the removal of radionuclides from radioactive liquid waste containing organic compounds. Nevertheless, pytoremediation potential of uranium (U) by nonliving aquatic macrophytes Lemna sp. and Pistia stratiotes has not been previously addressed. In this study, uranium biosorption capacity by Pistia stratiotes and Lemna sp. was evaluated by equilibrium and kinetics experiments. The biomasses were added to synthetic and real waste solutions. The assays were tested in polypropylene vials containing 10 mL of uranium nitrate solution and 0.20 g of biomass. Solutions ranging from 0.25 to 84.03 mmol l were employed for the assessment of uranium concentration in each macrophyte. The equilibrium time was 1 h for both macrophytes. Lemna sp. achieved the highest sorption capacity with the use of the synthetic solution, which was 0.68 mmol g for the macrophyte. Since Lemna sp. exhibit a much higher adsorption capacity, only this biomass was exposed to the actual waste solution, being able to adsorb 9.24 × 10 mmol g U (total). The results show that these materials are potentially applicable to the treatment of liquid radioactive waste.
基于生物吸附的技术已被提出用于从含有有机化合物的放射性液体废物中去除放射性核素。然而，非活性水生大型植物浮萍属和大薸对铀（U）的植物修复潜力此前尚未得到研究。在本研究中，通过平衡和动力学实验评估了大薸和浮萍属对铀的生物吸附能力。将生物量添加到合成和实际废液中。在含有10毫升硝酸铀溶液和0.20克生物量的聚丙烯小瓶中进行试验。使用浓度范围为0.25至84.03毫摩尔/升的溶液评估每种大型植物中铀的浓度。两种大型植物的平衡时间均为1小时。浮萍属在使用合成溶液时达到了最高吸附容量，该大型植物的吸附容量为0.68毫摩尔/克。由于浮萍属表现出更高的吸附容量，因此仅将这种生物量暴露于实际废液中，其能够吸附9.24×10毫摩尔/克U（总量）。结果表明，这些材料具有处理液体放射性废物的潜在应用价值。
