School of Resources and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, China.
Huanghuai University, Zhumadian, 463000, China.
Sci Rep. 2022 Mar 22;12(1):4861. doi: 10.1038/s41598-022-08542-0.
The discharge of yttrium containing wastewater is a potential risk to human health. Although biosorption is a promising method to remove yttrium from wastewater, whereas the application of it is limited due to the lack of efficient biosorbents. In this study, the removal of yttrium from wastewater using Serratia marcescens as a biosorbent was conducted. The effects of six parameters including pH (2-5.5), initial yttrium concentration (10-110 mg/L), biosorbent dosage (0.1-0.5 g/L), biosorption time (10-700 min), stirring speed (50-300 rpm) and temperature (20-60 °C) were evaluated. The main parameters were optimized using response surface methodology. The results showed that the adsorption capacity reached 123.65 mg/g at the optimized conditions. The biosorption mechanism was revealed based on a combined analysis using field emission transmission electron microscope-energy dispersion spectrum, Fourier transform infrared spectrophotometer, and X-ray photoelectron spectroscopy. These results revealed that the hydroxyl, carboxyl, and amino groups were the adsorption functional groups for yttrium ions. Biosorption of yttrium by S. marcescens is under the combination of ion exchange, electrostatic attraction and complexation. These findings indicated that S. marcescens can be used as an efficient biosorbent to remove yttrium from wastewater. In addition, its adsorption capacity can be further improved by the enhancement of adsorption functional groups on the surface through chemical modification.
含钇废水的排放对人类健康构成潜在风险。尽管生物吸附是一种从废水中去除钇的有前途的方法，但由于缺乏有效的生物吸附剂，其应用受到限制。在这项研究中，使用粘质沙雷氏菌作为生物吸附剂从废水中去除钇。考察了 pH 值（2-5.5）、初始钇浓度（10-110mg/L）、生物吸附剂用量（0.1-0.5g/L）、吸附时间（10-700min）、搅拌速度（50-300rpm）和温度（20-60°C）等六个参数的影响。采用响应面法对主要参数进行了优化。结果表明，在优化条件下，吸附容量达到 123.65mg/g。通过场发射透射电子显微镜-能谱、傅里叶变换红外分光光度计和 X 射线光电子能谱的综合分析，揭示了生物吸附机制。结果表明，羟基、羧基和氨基是吸附钇离子的功能基团。粘质沙雷氏菌对钇的吸附是离子交换、静电吸引和络合的综合作用。这些发现表明，粘质沙雷氏菌可用作从废水中去除钇的有效生物吸附剂。此外，通过化学修饰增强表面上的吸附功能基团，可以进一步提高其吸附容量。
