Yushin Nikita, Zinicovscaia Inga, Cepoi Liliana, Chiriac Tatiana, Rudi Ludmila, Grozdov Dmitrii
Department of Nuclear Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia.
Doctoral School Biological, Geonomic, Chemical and Technological Science, State University of Moldova, MD-2028 Chisinau, Moldova.
Materials (Basel). 2022 Sep 2;15(17):6101. doi: 10.3390/ma15176101.
Erbium belongs to rare earth elements critical for industry, especially nuclear technology. Cyanobacteria was used for Er(III) removal from wastewater by applying biosorption and bioaccumulation processes. The influence of pH, Er(III) concentration, contact time and temperature on the biosorption capacity of was determined. The optimal conditions for Er(III) removal were defined as pH 3.0, time 15 min and temperature 20 °C, when 30 mg/g of Er(III) were removed. The kinetics of the process was better described by the pseudo-first-order model, while equilibrium fitted to the Freundlich model. In bioaccumulation experiments, the uptake capacity of biomass and Er(III) effect on biomass biochemical composition were assessed. It was shown that Er(III) in concentrations 10-30 mg/L did not affect the content of biomass, proteins, carbohydrate and photosynthetic pigments. Its toxicity was expressed by the reduction of the lipids content and growth of the level of malonic dialdehyde. Biomass accumulated 45-78% of Eu(III) present in the cultivation medium. Therefore, can be considered as a safe and efficient bioremediator of erbium contaminated environment.
铒属于对工业尤其是核技术至关重要的稀土元素。通过生物吸附和生物累积过程，利用蓝藻从废水中去除铒（III）。测定了pH值、铒（III）浓度、接触时间和温度对其生物吸附能力的影响。当去除30 mg/g的铒（III）时，铒（III）去除的最佳条件为pH 3.0、时间15分钟和温度20°C。该过程的动力学用伪一级模型能更好地描述，而平衡符合弗伦德利希模型。在生物累积实验中，评估了生物量的摄取能力以及铒（III）对生物量生化组成的影响。结果表明，浓度为10 - 30 mg/L的铒（III）不影响生物量、蛋白质、碳水化合物和光合色素的含量。其毒性表现为脂质含量的降低和丙二醛水平的升高。生物量累积了培养基中45 - 78%的铕（III）。因此，可被视为铒污染环境的安全高效生物修复剂。
